585
WTNT43 KNHC 070847
TCDAT3
HURRICANE RAFAEL DISCUSSION NUMBER 15
NWS NATIONAL HURRICANE CENTER MIAMI FL AL182024
400 AM EST THU NOV 07 2024
SATELLITE IMAGES SHOW THAT RAFAEL REMAINS FAIRLY WELL-ORGANIZED,
WITH VERY COLD CONVECTIVE CLOUD TOPS, ALTHOUGH THE CENTRAL DENSE
OVERCAST IS A BIT RAGGED LOOKING. CONVECTIVE BANDING FEATURES ARE
LIMITED AND NO EYE IS EVIDENT ON THE IMAGERY AT THIS TIME.
UPPER-LEVEL OUTFLOW IS RESTRICTED OVER THE WESTERN SEMICIRCLE OF THE
CIRCULATION, INDICATIVE OF SOME WESTERLY VERTICAL WIND SHEAR OVER
THE TROPICAL CYCLONE. AN EARLIER AIR FORCE HURRICANE HUNTER MISSION
INTO THE SYSTEM MEASURED 700 MB FLIGHT-LEVEL WINDS OF 101 KT IN THE
NORTHEAST QUADRANT WHICH EQUATES TO A PEAK SURFACE WIND OF ABOUT 90
KT. THIS INTENSITY IS ALSO SUPPORTED BY A BLEND OF THE LATEST
SUBJECTIVE AND OBJECTIVE DVORAK ESTIMATES. ANOTHER AIR FORCE
HURRICANE HUNTER AIRCRAFT IS SCHEDULED TO INVESTIGATE RAFAEL LATER
THIS MORNING.
THE HURRICANE CONTINUES TO MOVE AWAY FROM WESTERN CUBA WITH AN
INITIAL MOTION OF ABOUT 305/10 KT. RAFAEL IS LOCATED ON THE
SOUTHWEST SIDE OF MID-LEVEL RIDGE OVER THE WESTERN ATLANTIC
AND THE FLORIDA PENINSULA. MOST OF THE GLOBAL MODELS GUIDANCE
SHOWS THIS RIDGE BUILDING WESTWARD, ALBEIT WEAKLY, OVER THE
GULF OF MEXICO DURING THE NEXT FEW DAYS. AS A RESULT, RAFAEL
SHOULD TURN WESTWARD WITH SOME DECREASE IN FORWARD SPEED DURING THE
NEXT 2-3 DAYS. THEN, THE MAJORITY OF THE MODELS SHOW A RIDGE
BUILDING TO THE WEST OF THE SYSTEM. THIS STEERING EVOLUTION WOULD
CAUSE RAFAEL TO TURN MORE SOUTHWARD, AND THIS IS SHOWN BY THE
DYNAMICAL MODEL CONSENSUS TRACK PREDICTION. THE NEW OFFICIAL
FORECAST IS ADJUSTED TO THE LEFT OF THE PREVIOUS NHC TRACK BUT IS
NOT AS FAR SOUTH AS THE CONSENSUS. THE MOTION IS LIKELY TO BE
QUITE SLOW DURING THE LATTER PART OF THE FORECAST PERIOD. THERE
REMAINS SIGNIFICANT UNCERTAINTY IN THE FUTURE TRACK OF RAFAEL OVER
THE GULF OF MEXICO AND ADDITIONAL ADJUSTMENTS TO SUBSEQUENT OFFICIAL
TRACK FORECASTS ARE LIKELY.
SOUTHWESTERLY VERTICAL WIND SHEAR SHOULD CONTINUE TO AFFECT RAFAEL,
ALTHOUGH THE LATEST SHIPS MODEL OUTPUT DOES NOT SHOW VERY STRONG
SHEAR OVER THE SYSTEM DURING THE NEXT SEVERAL DAYS. HOWEVER, THE
NUMERICAL GUIDANCE DOES INDICATE VERY DRY AIR AROUND RAFAEL THROUGH
THE FORECAST PERIOD, WHICH SHOULD INDUCE WEAKENING. IF THE SYSTEM
MOVES FARTHER SOUTH OVER THE GULF THAN CURRENTLY ANTICIPATED, IT
COULD ENCOUNTER LOWER WIND SHEAR, AND LIKELY A MORE MOIST AIR MASS.
THIS COULD RESULT IN RAFAEL MAINTAINING ITS INTENSITY MORE THAN
CURRENTLY EXPECTED. FOR NOW, THE OFFICIAL INTENSITY FORECAST IS
SIMILAR TO THE PREVIOUS ONE AND CALLS FOR WEAKENING LATER IN THE
PERIOD. THIS IS SIMILAR TO THE LATEST MODEL CONSENSUS.
KEY MESSAGES:
1. TROPICAL-STORM-FORCE WINDS ARE EXPECTED IN THE DRY TORTUGAS
THROUGH THIS MORNING.
2. HURRICANE RAFAEL WILL CONTINUE TO BRING PERIODS OF HEAVY RAIN TO
WESTERN CUBA TODAY. FLASH FLOODING AND MUDSLIDES ARE POSSIBLE ALONG
THE HIGHER TERRAIN.
3. RAFAEL IS FORECAST TO MEANDER OVER THE SOUTH-CENTRAL GULF OF
MEXICO THIS WEEKEND AND EARLY NEXT WEEK. INTERESTS IN THE SOUTHERN
AND SOUTHWESTERN GULF OF MEXICO SHOULD MONITOR THE PROGRESS OF THIS
SYSTEM.
FORECAST POSITIONS AND MAX WINDS
INIT 07/0900Z 24.2N 84.6W 90 KT 105 MPH
12H 07/1800Z 24.4N 85.9W 85 KT 100 MPH
24H 08/0600Z 24.5N 87.7W 85 KT 100 MPH
36H 08/1800Z 24.6N 89.4W 80 KT 90 MPH
48H 09/0600Z 24.6N 90.5W 80 KT 90 MPH
60H 09/1800Z 24.6N 91.7W 75 KT 85 MPH
72H 10/0600Z 24.6N 92.4W 65 KT 75 MPH
96H 11/0600Z 24.2N 93.0W 50 KT 60 MPH
120H 12/0600Z 23.5N 93.6W 35 KT 40 MPH
FORECASTER PASCH
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