Typhoon Melor Leaves Japan Behind;Former Typhoon Parma Still Taking Filipino Lives October 8, 2009

Click on Image for most recent W. Pacific IR Loop

See latest storm info and story on rising death toll from Typhoon Parma-over 100 dead in Philippines CLICK HERE

Typhoon Melor Forecast Track

Typhoon Melor crossed the Japanese Island of Honshu relatively quickly but still brought very heavy rain and gusty winds.  At least three people lost their lives as a result of Typhoon Melor.  The forecast track for Typhoon Melor was pretty much on the money with a landfall early Thursday morning with winds topping at 139 kmh or 86 mph south of Nagoya, Japan.  The wave heights were some 9 meters, or 30 feet.  The Typhoon Melor prognastic reasoning from the Joint Typhoon Warning Center has been consistent with the idea that the storm will quickly transform from a tropical cyclone into an extra-tropical storm as it continues to race to the northeast.  Due to its rapid movement, the effects of the storm will subside across Japan by the end of the day. It’s moving so rapidly that the JTWC has issued its final warning for Typhoon Melor.  Commuter train service was haulted Thursday morning in Tokyo but will be restored by the afternoon rush hour.  Toyota shut down plants for the day but operations should resume quickly.  Shipping interests also will be returning to normal as the seas begin to subside.  Hokkaido will feel the effects of Melor will persist even though its losing its tropical characteristics because the structure will not change the windy and heavy rain aspects of the storm.

Parma Forecast Track

Meanwhile, to the south, the remnant of Typhoon Parma (JTWC discussion) remains parked over the northern Philippines.  Early Thursday morning, convection began to explode over parts of the island as the storm center had drifted just off the northeastern coast of the nation.  Wednesday had been relatively benign an clean up operations began from Tropical Storm Ketsana over a week ago.  The heavy rain produced by now Tropical Depression Parma brought more landslides that killed at least 6 more people, including a man who was doing clean up work and also several small children who were buried in their homes.    The storm is expected to continue to linger over the Philippines throughout the day before it moves to the west and finally away from the drenched nation on Friday.  Thereafter, it should regain some strength as it moves toward Vietnam, which also suffered from flooding and deaths due to Tropical Storm Ketsana. 

Depression 21 Forecast Track

Meanwhile, if you look at the color enhanced infrared satellite loop above, you will notice two other areas of interest to the east-southeast of the Philippines that appear to be candidates for development.  The largest of the two is to the east of the Philippines and is showing up quite prominently on the satellite loop.  It has been designated Depression 21 and is forecast to have some development but the forecast track from the Joint Typhoon Warning Center suggests a more northward movement and it is not expected to affect land at this time.  However, to its south and east is another system that looks suspicious to me.  I’m sure the JTWC will begin issuing reports on it over the next 48-72 hours.

Parma Parked Over Philippines; Typhoon Makes Turn Toward Japan October 6, 2009

Parma(pepeng) Satellite Image 1130Z 1006 Still looks rather impressive

For a more recent update on Typhoon Melor as it makes landfall in Japan and Parma still in the Philippines, CLICK HERE

Water Vapor Image 2030Z 10.06 click image for latest loop

The tropical storm formally known as Typhoon Parma has followed the general track that I outlined several days ago.  The satellite image above shows that the storm still has a very impressive structure considering that it has spent much time of cooling, upwelling waters and has not been completely over the water for some time.  The satellite water vapor image and loop is not overly impressive as the storm center is now over land in the Luzon province of the Philippines. This recent news report says its not over the Philippines and won’t make landfall, but the satellite says otherwise. So far, Parma has taken 22 Filipino lives.   A ship sank in the rough South China Sea, courtesy of Parma  You can detect some convection that shows up a little better on the Infrared color satellite image above. 

Click Image for Most Recent Color IR Loop

Parma has reacted as I suggested that it might a few days ago and as the GFS model has been consistently suggesting over time.  The NOGAPS also came around to that way of thinking but the official forecast from the JTWC did not reflect this potential in its official forecast until this morning, though they did make mention of it in their discussion.  While Parma is located over the Philippines, the threat of heavy rains will persist.  Parma dropped very heavy rain in the southern portions of Taiwan and the mountainous regions of the Philippines will be under the threat of landslides until the storm gets picked up by an expanding ridge in China which will take the storm to the west back into the South China Sea.  A note for those of you in Southeast Asia:  The Joint Typhoon Warning Center discussion below indicates that the environment in the South China Sea will be conducive to re-intensification as Parma moves westward toward mainland Asia.

Parma(pepeng)Forecast Track 18Z 10.06 click image for latest update

WDPN33 PGTW 061500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 19W (PARMA)//
WARNING NR 36//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
    A. TROPICAL STORM (TS) 19W (PARMA) HAS MAINTAINED A STRONG CON-
VECTIVE SIGNATURE CHARACTERIZED BY MULTIPLE CONVECTIVE BANDS WRAPPED
TIGHTLY INTO THE LOW LEVEL CIRCULATION CENTER (LLCC) AND HAS TRACKED
SOUTHEASTWARD TOWARD THE NORTHWESTERN TIP OF LUZON OVER THE PAST 12
HOURS. TS PARMA IS CURRENTLY SITUATED IN A BREAK OF THE SUBTROPICAL
RIDGE. IT DOES APPEAR THAT PARMA'S RECENT SOUTHEASTWARD MOVEMENT CAN
BE ATTRIBUTED TO SOME INTERACTION WITH TYPHOON MELOR, LOCATED
APPROXIMATELY 675 NM TO THE NORTHEAST. THE CURRENT INTENSITY IS BASED
ON DVORAK ESTIMATES FROM RJTD AND KNES AND THE CURRENT POSITION IS
SUPPORTED BY THE 060935Z WINDSAT IMAGE, WHICH CAPTURED THE SYSTEM JUST
PRIOR TO LANDFALL.
3. FORECAST REASONING
    A. THE FORECAST REASONING HAS NOT SIGNIFICANTLY CHANGED SINCE THE
LAST PROGNOSTIC REASONING BULLETIN.
    B.  AS TYPHOON MELOR CRESTS ITS SUBTROPICAL STEERING RIDGE AND
TRACKS TOWARDS THE MID-LATITUDES, TS PARMA WILL CONTINUE TO DRIFT
GENERALLY SOUTH-SOUTHWESTWARD OVER THE NORTHWESTERN PORTION OF LUZON.
BY TAU 48, THE SYSTEM WILL LOSE SOME ENERGY DUE TO LAND INTERACTION.
    C. BEYOND TAU 48, TS PARMA WILL START TO TRACK WESTWARD UNDER THE
INFLUENCE OF THE SUBTROPICAL STEERING RIDGE ANCHORED OVER CHINA WHICH
IS FORECAST TO GRADUALLY BUILD EASTWARD. AS THE STEERING INFLUENCE
BECOMES MORE DEFINED BY TAU 72, PARMA WILL START TO PICK UP TRACK
SPEED THROUGH THE SOUTH CHINA SEA AND RE-INTENSIFY UNDER FAVORABLE
ENVIRONMENTAL CONDITIONS CHARACTERIZED BY GOOD EQUATORWARD OUTFLOW
SOUTH OF THE SUBTROPICAL RIDGE AXIS. THE NUMERICAL MODEL AIDS
GENERALLY AGREE WITH AN EVENTUAL TURN TO THE WEST, THOUGH THE TIMING
AND DEGREE OF THIS TURN VARIES WIDELY AS PARMA CURRENTLY SITS IN A
WEAK STEERING ENVIRONMENT. THIS FORECAST LEANS ON THE EGRR TRACKER
PROVIDED BY THE UKMO AND THE EXTENDED-RANGE FORECASTS PROVIDED BY THE
ECMWF.//
NNNN

W Pac Infrared Satellite 2030Z 10.06 click image for latest loop

Typhoon Melor continues to progress as forecast.  The slight interaction with Parma that caused Parma to slide farther south and southeast back to the Philippines resulted in a slight northwestward hitch in the path of Melor as it moved across the northwestern Philippines Sea.  The result of this is that the curving of motion took place farther west than earlier anticipated and the northeastward track has now set the stage for the Typhoon to run up the largest Japanese Island of Honshu and eventually close to Tokyo.  However,  as the storm rounds the edge of the ridge of high pressure that is steering it, Melor starts to get sheered by unfavorable upper level winds.  The latest satellite imagery indicates this deterioration has already begun.  As it accelerates northeast, it will encounter land after landfall south of Kyoto,  Japan and continue to interact with the Japanese mainland and come into a hostile environment as it begins to transition into an extra-tropical cyclone.  The fact that it will be going through a deterioration stage will mean only minimal typhoon strength winds as it goes across Japan and the fact that it will be increasing in forward speed will limit its rainfall potential.  Nevertheless, the Japanesese topography should enhance the rainfall potential, particularly on the eastern slopes of the mountains and so heavy rain is likely only the eastern third of Japan. 

Typhoon Melor 1130Z 1006 Losing Some Symmetry

WDPN34 PGTW 061500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TYPHOON 20W (MELOR) WARNING NR 30//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
    A. TYPHOON (TY) 20W (MELOR) HAS MAINTAINED A WELL-ORGANIZED
CONVECTIVE STRUCTURE OVER THE LAST 12 HOURS THOUGH RECENT ANIMATED
INFRARED IMAGERY REVEALS THE SYSTEM IS STARTING TO ERODE IN THE
NORTHWESTWERN QUADRANT. ANIMATED WATER VAPOR IMAGERY ALSO INDICATES
THAT POLEWARD OUTFLOW HAS INCREASED INTO THE MID-LATITUDE WESTERLIES
AS TY MELOR IS CRESTING THE SUBTROPICAL RIDGE AXIS. THE CURRENT
POSITION AND INTENSITY IS BASED WITH HIGH CONFIDENCE ON DIVORAK FIXES

Typhoon Melor Forecast Track 18Z 10.06 click on image for latest update

BY PGTW, RJTD, AND KNES. IN ADDITION, THE SATCON INTENSITY ESTIMATE
WAS 113 KNOTS.
3. FORECAST REASONING
   A. THE FORECAST PHILOSOPHY HAS NOT SIGNIFICANTLY CHANGED SINCE
THE PREVIOUS PROGNOSTIC REASONING BULLETIN.
   B. TY MELOR WILL CREST THE WESTERN EDGE OF THE SUBTROPICAL
STEERING RIDGE OVER THE NEXT 12 HOURS AND WILL START TO ACCELERATE
INTO THE MID-LATITUDE WESTERLIES. ON THE NORTHERN SIDE OF THE RIDGE
AXIS, TY MELOR WILL START TO ENCOUNTER MORE UNFAVORABLE VERTICAL WIND
SHEAR ASSOCIATED WITH THE MID-LATITUDE WESTERLIES AND WILL CONTINUE
TO WEAKEN PRIOR TO MAKING LANDFALL SOUTH OF KYOTO, JAPAN.
ADDITIONALLY, MELOR WILL START TO ENGAGE WITH THE BAROCLINIC ZONE
AROUND TAU 24 AND WILL COMPLETE EXTRATROPICAL TRANSITION BY TAU 48.
THE MODEL AIDS ARE IN TIGHT AGREEMENT WITH A LANDFALL SCENARIO WEST
OF TOKYO, JAPAN. HOWEVER, THE UKMO TRACKER, EGGR, IS THE EASTERN
OUTLIER AS IT TRACKS THE SYSTEM OVER TOKYO, JAPAN. THIS FORECAST DOES
NOT TAKE MELOR AS FAR EAST AS THE EGRR TRACKER, THOUGH IT DOES TRACK
CONSIDERABLY EAST OF THE JTWC CONSENSUS.//

Parma Forecast Track Dangerously Close to the Philippines; Melor Has Sight on Tokyo October 6, 2009

W Pacific color IR 2330Z 10.05.09 (click image for loop)

for a more recent update on Parma (pepeng) and Typhoon Melor, CLICK HERE

Parma Forecast Track JTWC

The former Typhoon Parma forecast track (JTWC discussion below) is getting uncomfortably close to Luzon in the Philippines.  Basically what is happening is that the powerful Super Typhoon Melor (JTWC discussion below) is racing west-northwestward across the Philippines Sea and its substantial flow is taking the drifting Tropical Storm Parma back south from the same direction that it came.   Melor is being affected a little by this binary interaction with Parma and is now forecast to move a little more northwest prior to its shift in direction.  Typhoon Melor gets caught up in a strong southwesterly flow and it shoots to the northeast and begins to get sheared in the process.  That would weaken Melor as it moves up along the western coast of Japan, though the most recent forecast tracks have been consistently running the storm either across Tokyo Bay or just at the entrance to Tokyo Bay.  However, this latest forecast track has the storm swinging farther west(due to Parma) and therefore the northeastern track has Melor streaking inland over the top of Tokyo itself.  It  remains to be seen if that track comes about but Melor is expected to be a minimum typhoon at that time.   I suspect since it had been so formidable and because of its forward momentum, it will probably have a higher storm surge than what might normally be expected with a weakening typhoon that is transitioning to extra-tropical status.  On the other hand, its quick pace would also mean that the threat for extreme rainfall in Japan may be reduced.

Typhoon Melor Forecast Track JTWC

As for Parma, the forecast suggests that the storm does not strengthen as it moves back south or south-southeast because its moving very slowly back over water that is already been churned up.  That would mean that essentially the warm water on the surface has been blown around and cooler water from below has come up to take its place. Its called upwelling and is why a tropical cyclone needs to stay on the move if its going to survive.    Nevertheless, the issue with the Philippines and particularly the area around Manila, is rainfall and just because  the intensity decreases doesn’t mean that heavy rains are not possible.  Remember, Ketsana was just a tropical storm and flooding from it killed nearly 300 people and some 200 more in Southeast Asia.  Now the boys at the Joint Typhoon Warning Center do kick the storm out to the west before it comes back across the Philippines but it may be close enough to cause problems.  In the meantime, the forecast calls for an increase in intensity as it kicks west and that could mean problems down the road for the same parts of Southeast Asia, namely Vietnam, that also had trouble with Ketsana.

Mon 18Z NOGAPS valid 00Z Wed

Mon 12Z GFS valid 00Z Wed

Here is what is troubling.  I only have access to the 12Z run of the GFS and the 18Z run of the NOGAPS.  Previously, it was the GFS that kept on wanting to take Parma back over the Philippines, most notably right over Manila.  Now, Parma is kinda stuck between a ridge to the west and ridge to the east.  Its got nothing to steer it except the little bit of influence south by Melor.  The thinking is that the ridge to the west will be dominant and take Parma west.  The Joint Typhoon Warning Center seems to be discounting the GFS and NOGAPS as indicated by this sentence in their discussion:  “The available numeric guidance are in wide disagreement with the GFS and NOGAPS attempting an eventual turn to the Northeast and the European and EGRR and ECMWF favoring and eventual westerly track into the South China Sea.”  My concern is that the GFS has been consistent in wanting to bring the storm back over the Philippines one way or another. 

Mon 18Z NOGAPS valid 00Z Thu

Mon 12Z GFS valid 00z Thu

Now, the NOGAPS has jumped on board with that thinking, at least for this model run.  This storm has been exteremly difficult to track due to so many variable influences and the fact that its kinda gotten stuck in no man’s land without strong steering guidance.  In my view, it is still beyond human capabilities to make any definitive statement concerning the ultimate fate in relation to Parma.  I think its safe to say that rain will continue to fall over Luzon, whether or not its intense heavy rain over an extended period of time remains to be seen and we’ll just have to wait and see whether the influence of Melor will be sufficient to run the storm all the way back to the Philippines or if the ridge to the west will nose in strong enough and fast enough to take it away.  Either way, it remains to be seen whether, given the proximity of the storm to the Philippines in any scenario and that it currently has decent upper level venting to allow for development of convection, if the storms move over the islands in the counter-clockwise flow cause more flooding problems.  The government of the Philippines seem to be better prepared and seems to be ready for any eventuality. 

WDPN33 PGTW 051500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 19W (PARMA) WARNING
NR 32//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
    A. DEEP CONVECTION HAS ONCE AGAIN BEGUN TO FLARE OVER THE
CENTER OF TROPICAL STORM (TS) 19W (PARMA). STRONG VENTING TO
THE NORTHEAST HAS HELPED THE SYSTEM RECUPERATE SOME OF ITS
DEEP CONVECTION LOST NEARLY 24 HOURS AGO FROM THE PASSAGE OF
AN UPPER LEVEL SHORTWAVE TROUGH. A VERY STRONG VERTICAL WIND
SHEAR GRADIENT IS LOCATED JUST TO THE NORTH OF THE STORM. THE
STORM HAS MOVED VERY LITTLE OVER THE PAST 12 HOURS AND REMAINS
IN THE LUZON STRAIT.
3.   FORECAST REASONING
    A. THE FORECAST HAS BEEN SLOWED BEYOND TAU 72 IN ORDER TO
REFLECT DECREASED CONFIDENCE THAT THE SYSTEM WILL EXIT
THIS QUASISTATIONARY STATE BEFORE DAY 5. AS IS TYPICAL IN A
WEAK OR AMBIGUOUS STEERING ENVIRONMENT, THE MODEL TRACKERS
ARE HANDLING THE SITUATION POORLY.
    B. THE SYSTEM IS EXPECTED TO LINGER OFF THE NORTHWEST
COAST OF LUZON FOR THE NEXT 5 DAYS. THERE ARE STILL SOME
INDICATIONS AMONG THE MODEL FIELDS THAT THE STORM WILL
EVENTUALLY PULL OUT TO THE WEST NEAR THE END OF THE FORECAST
PERIOD AS RIDGING RE-ESTABLISHES OVER SOUTHERN CHINA, BUT
AGAIN, THERE IS MUCH UNCERTAINTY. INTENSIFICATION IS NOT
LIKELY BEYOND THE NEXT 24 HOURS DUE TO MARGINAL UPPER LEVEL
CONDITIONS AND UPWELLING OF COOL, SUB-SURFACE WATER. HOWEVER,
DURING THE FIRST 24 HOURS INTENSIFICATION IS POSSIBLE DUE TO
ENHANCED POLEWARD OUTFLOW AHEAD OF THE UPPER LEVEL TROUGH
MENTIONED IN PARA 2.A. THE FORECAST REFLECTS A QUASI-
STATIONARY STEERING ENVIRONMENT WITH A SOUTHERLY DRIFT.
    C. IF THE SYSTEM REMAINS QUASISTATIONARY AT DAY 4 AND
BEYOND, FURTHER WEAKENING IS EXPECTED DUE TO DECREASED OCEAN
HEAT CONTENT FROM UPWELLING. INTENSITIES HAVE BEEN DECREASED
IN THE LATER FORECAST PERIOD TO REFLECT THE INCREASED LIKLIHOOD
OF THIS SCENARIO. //

WDPN34 PGTW 051500
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR SUPER TYPHOON 20W (MELOR) WARNING NR 26//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
   A. SUPER TYPHOON (STY) 20W (MELOR) IS CURRENTLY A 135 KNOT
SYSTEM,BASED ON A COMPROMISE BETWEEN THE FINAL-T (6.0) AND
CURRENT INTENSITY (7.0) FROM THE PGTW DVORAK FIX. THE SYSTEM
HAS TRACKED FROM WEST-NORTHWESTWARD AT 050600Z TO NORTHWESTWARD
AT 051200Z AND HAS SLOWED BY 2 KNOTS. THE DECREASED TRACK SPEED
AND INCREASED NORTHWARD TURN ARE BOTH PRECURSORS TO RECURVATURE.
UPPER LEVEL TROUGHING NEAR THE CAROLINE ISLANDS IN MICRONESIA
HAS BEGUN TO ENCROACH ON THE EASTERN SIDE OF THE SYSTEM. AS A
RESULT, FAVORABLE VENTING INTO THIS FEATURE HAS CEASED.
UNRELATED, THE CENTRAL DENSE OVERCAST HAS GROWN CONSIDERABLY,
AND THE EYE IS AT ITS LARGEST DIAMETER YET (32NM). MORE
RECENTLY, DEEP CONVECTION HAS BECOME INCREASINGLY DISPLACED TO
THE NORTHWEST AS THE STY NEARS AN UPPER LEVEL TROUGH NEAR THE
EAST COAST OF ASIA.
3. FORECAST REASONING
   A. THE FORECAST PHILOSOPHY HAS NOT SIGNIFICANTLY CHANGED
SINCE THE PREVIOUS PROGNOSTIC REASONING BULLETIN.
   B. STY 20W WILL CONTINUE TO TRACK ALONG THE SOUTHWESTERN
PERIPHERY OF THE SUBTROPICAL STEERING RIDGE BEFORE ENCOUNTERING
STRONG UPPER LEVEL WESTERLIES ASSOCIATED WITH A DEEP UPPER LEVEL
TROUGH NEAR OKINAWA. THE SYSTEM IS POSITIONED TO VENT AHEAD OF
THIS FEATURE AND MAY ACCOUNT FOR SHORT TERM INTENSIFICATION.
HOWEVER, SHORTLY THEREAFTER, THE TYPHOON WILL BEGIN TO WEAKEN
DUE TO EXCESSIVE VERTICAL WIND SHEAR AND DECREASED OCEAN HEAT
CONTENT. THE PREVIOUSLY MENTIONED TROUGH WILL ALSO ERODE THE
STEERING RIDGE AND INITIATE RECURVATURE INTO THE MID-LATITUDES.
INTERACTION WITH A STRONG BAROCLINIC BOUNDARY (NEAR 30N) WILL
PROMPT EXTRATROPICAL TRANSITION, JUST TO THE SOUTH OF TOKYO.
THE FORECAST REMAINS CONSISTENT WITH THE PREVIOUS FORECASTS AND
CALLS FOR PASSAGE OF MELOR AS A TRANSITIONING CYCLONE ALONG THE
EAST COAST OF JAPAN. THE TYPHOON WILL BE FULLY EXTRATROPICAL BY
TAU 72.//

Parma Regaining Strength, Super Typhoon Melor May Threaten Tokyo October 5, 2009

W Pac Color IR Satellite-Click Image for Loop

for an update on Parma and Typhoon Melor CLICK HERE

Parma (pepeng) Forecast Track JTWC

Tropical Storm Parma appears to be on the verge of recovering from the influence of an upper level trof that appeared out of nowhere out of China and dove down to mess up the storm.  So much did it disrupt Parma (pepeng) that it fell from the classification of a typhoon to that of a tropical storm.  Now that the trof is lifting out to the northeast, satellite imagery is indicating perhaps some re-development of convection which would coincide with intensification.  This is not totally unexpected as, even when Parma got zapped, the low level mean circulation remained strongly in tact.  So, as Super Typhoon Melor moves quickly across the Philippine Sea, Parma will drift to the south or southwest.  The official forecast from the Joint Typhoon Warning Center has been consistent for 24 hours for the first time in days, which tells me that their confidence is increasing.  They indicate that most models show a big ridge over China becoming a dominant feature to steer Parma away to the west.  Indeed the US Navy NOGAPS shows depicts exactly that and takes  small, compact storm into Viet Nam. 

GFS 18Z 10.06.09

However, the GFS continues to not play along.  Previously, it was insisting on a track drifting to the south and then southeast around the periphery of Typhoon Melor as it went by to the east.  Now, what it seems to want to do is have Parma more or less get cut off from everything else.  Not influenced by an ridge over China, nor anything else and too far from Melor to be affected except that it drifts south to the northern tip of the Philippines and then it just sits there for a few days.  It tends to feature heavy banding on the backside whacking the western coast of Luzon…which is not good.  As it stands now, at least 15 have been killed by Parma and more rain is expected in Luzon.

NOGAPS 18Z 10.06.09

A couple of things here…first off the JTWC points out that, while they re-intensify Parma to minimal typhoon status in the next 24-36 hours, they mention that upwelling may mess that up and, if it doesn’t and follows thier forecast, then it would run into a sheering environment and cooler water as it approach Viet Nam.  If Parma were to do what the GFS suggests,then upwelling I would think would be a factor and so it may not be a typhoon in that instance.  But, so what…Ketsana wasn’t a typhoon either.  It’s the rain potential that is the fear.

W Pacific Water Vapor Image 230Z 10.05 click image for loop

As for Typhoon Melor (JTWC Discussion) its a super typhoon with winds of 140 kts kicking up gusts to 160 kts.  For those of us in the United States that would be about 160 mph winds with 185 mph gusts or a category 5 hurricane.  It’s still a long way off but the forecast track has shifted some with the big curve to the northeast when it is in the Luzon Strait coming a tad later, which means that the track now takes it right over Tokyo Bay instead of just offshore. 

Typhoon Melor Forecast Track

However, by that time, Melor would have run into an unfavorable upper level environment and it would have weakened to a minimal typhoon.  But, it would have also picked up forward speed.  In this scenario, I would think that the storm would create a storm surge higher than one might associate with a minimal typhoon due to its forward momentum and the fact that it had been such an intense storm prior to passing over Tokyo Bay.  But, were talking about 3 or 4 days out and there are many things that can happen. Intensity forecasts are notoriously difficult to pin down that many days out.

WDPN33 PGTW 050300
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/PROGNOSTIC REASONING FOR TROPICAL STORM 19W (PARMA) WARNING NR
30//
RMKS/
1. FOR METEOROLOGISTS.
2. 12 HOUR SUMMARY AND ANALYSIS.
    A. FOLLOWING THE PASSAGE OF A MID- TO UPPER LEVEL SHORTWAVE
TROUGH, TROPICAL STORM (TS) PARMA HAS BEGUN TO REDEVELOP DEEP
CONVECTION AROUND ITS LOW LEVEL CIRCULATION CENTER (LLCC) AND IN THE
BANDING TO THE NORTH OF THE LLCC. DVORAK ESTIMATES FROM PGTW HAVE
REMAINED AT A 3.0/4.0. THE FINAL-T NUMBER IS BASED ON THE PATTERN-T,
VICE A WRAP, BECAUSE THE CONVECTION IS TOO WEAK. THE SYSTEM HAS ALSO
BECOME LARGELY QUASI-STATIONARY WITHIN A WEAK STEERING ENVIRONMENT,
HAVING ONLY MOVED 30NM OVER THE PAST 12 HOURS.
3.   FORECAST REASONING
    A. THE FORECAST PHILOSOPHY HAS NOT CHANGED SINCE THE LAST
PROGNOSTIC REASONING BULLETIN.
    B. THE SYSTEM IS STILL EXPECTED TO MEANDER TO THE NORTHWEST OF
LUZON IN THE SOUTH CHINA SEA FOR THE NEXT 4 DAYS. THE POTENTIAL FOR
MILD RE-INTENSIFICATION EXISTS NOW THAT THE TROUGH MENTIONED IN PARA
2.A. HAS PASSED TO THE EAST. HOWEVER, UPWELLING OF COOLER WATER WILL
BEGIN TO STALL INTENSIFICATION OR EVEN BEGIN TO WEAKEN THE SYSTEM.
THERE IS STILL SOME UNCERTAINTY IN THE TRACK OF TS 19W GIVEN THAT IT
IS IN A WEAK AND ILL-DEFINED STEERING ENVIRONMENT. IF RIDGING BUILDS
TO THE WEST OF THE SYSTEM, THEN THE STORM WILL GRADUALLY BEGIN TO
PULL OUT TO THE SOUTHWEST, AS THE MAJORITY OF THE DYNAMIC AIDS
INDICATE. ON THE OTHER HAND, IF THE RIDGE TO THE EAST REBUILDS
FASTER (AND STRONGER) THAN THE RIDGE TO THE WEST THEN THAT WILL
BECOME THE PREDOMINANT STEERING MECHANISM FOR PARMA.
    C. IN THE LATER PERIOD THE SYSTEM SHOULD START TO ACCELERATE
ALONG THE FAVORED TRACK TO THE SOUTHWEST ALONG THE SOUTHEASTERN
PERIPHERY OF THE SUBTROPICAL RIDGE LOCATED OVER SOUTHERN CHINA. 19W
WILL MOVE INTO LOWER AMOUNTS OF FAVORABLE OCEAN HEAT CONTENT
AND INCREASING VERTICAL WIND SHEAR ALONG THIS TRACK AND START TO
SLOWLY WEAKEN.//
NNNN