98L may develop early next week
A tropical wave located about 500 miles east of the Lesser Antilles Islands (Invest 98L) is headed west-northwest at about 15 mph, and is a threat to develop into a tropical depression early next week. The disturbance has a modest amount of spin and a large amount of disorganized heavy thunderstorms, as seen on satellite loops, but there is no sign of a surface circulation. Wind shear is a moderate 10 - 20 knots over 98L, the atmosphere is moist, and ocean temperatures are a very warm 30°C. With wind shear expected to rise to the high range, 20 - 30 knots, Wednesday night though Friday, any development the next few days should be slow. The shear is due to an upper-level trough of low pressure centered a few hundred miles northeast of the Lesser Antilles Islands. Once 98L passes beyond the Lesser Antilles on Saturday, the shearing winds of the trough will diminish to the moderate range, 10 - 20 knots. Most of the models predict that 98L will show increasing development beginning on Saturday. The NOGAPS model has 98L developing into a tropical depression on Monday, a few hundred miles northeast of the southeastern Bahama Islands. The GFS model is much slower with the system, predicting it will develop into a tropical depression on Monday, a few hundred miles north of Puerto Rico. Moisture from 98L should affect the Lesser Antilles Islands on Thursday and Friday, and Puerto Rico and the Virgin Islands on Friday and Saturday. It is uncertain if heavy rains from 98L will affect the Dominican Republic early next week; the storm may stay too far to the northeast. In their 8 am Tropical Weather Outlook, NHC gave 98L a 30% chance of becoming a tropical cyclone by Friday morning. The long range fate of 98L is uncertain; the ECMWF model shows 98L becoming absorbed by a cold front and bringing heavy rains to Canada and New England on Tuesday and Wednesday next week, while the GFS and NOGAPS models predict that 98L will stay out to sea for at least the next week.
Figure 1. Morning satellite image of Invest 98L approaching the Lesser Antilles Islands.
Jeff Masters
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Henry Margusity Fan Club
To top it off, we may have another major severe weather outbreak next week just east of where it happens Saturday.
It is strongly implied.
"GIVEN THE STRENGTH OF THE WARM SECTOR DEEP LAYER MEAN FLOW
FIELDS/SHEAR AND FORCING FOR UPWARD VERTICAL MOTION...SEVERE
POTENTIAL ON SATURDAY MAY ULTIMATELY BE HIGHER THAN CURRENTLY
INDICATED BY THE SLIGHT RISK CATEGORICAL OUTLOOK."
000
ABNT20 KNHC 111133
TWOAT
TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 AM EDT THU OCT 11 2012
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
A BROAD AREA OF LOW PRESSURE ASSOCIATED WITH A TROPICAL WAVE IS
LOCATED ABOUT 350 MILES EAST-SOUTHEAST OF THE WINDWARD ISLANDS.
SHOWER AND THUNDERSTORM ACTIVITY HAS INCREASED A LITTLE NEAR THE
LOW DURING THE LAST FEW HOURS...AND ENVIRONMENTAL CONDITIONS APPEAR
CONDUCIVE FOR GRADUAL DEVELOPMENT OF THIS LARGE DISTURBANCE OVER
THE NEXT COUPLE OF DAYS. THIS SYSTEM HAS A MEDIUM CHANCE...50
PERCENT...OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS
AS IT MOVES WEST-NORTHWESTWARD AT 10 TO 15 MPH. REGARDLESS OF
DEVELOPMENT...STRONG GUSTY WINDS AND HEAVY RAINFALL ARE POSSIBLE
ACROSS PORTIONS OF THE LESSER ANTILLES DURING THE NEXT COUPLE OF
DAYS. ADDITIONAL INFORMATION ON THIS DISTURBANCE CAN BE FOUND IN
HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WATHER SERVICE.
SHOWER AND THUNDERSTORM ACTIVITY HAS CHANGED LITTLE OVER THE PAST
FEW HOURS IN ASSOCIATION WITH A SMALL AREA OF LOW PRESSURE LOCATED
ABOUT 250 MILES NORTHEAST OF THE CENTRAL BAHAMAS. THERE IS STILL A
SMALL WINDOW OF OPPORTUNITY FOR A TROPICAL DEPRESSION TO FORM
BEFORE THE LOW MERGES WITH A COLD FRONT LATER TODAY. THIS SYSTEM
HAS A MEDIUM CHANCE...50 PERCENT...OF BECOMING A TROPICAL CYCLONE
DURING THE NEXT 48 HOURS AS IT MOVES SLOWLY SOUTHWARD. ADDITIONAL
INFORMATION ON THIS DISTURBANCE CAN BE FOUND IN HIGH SEAS FORECASTS
ISSUED BY THE NATIONAL WATHER SERVICE.
ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.
It is implying that an upgrade to a MDT risk is possible but not 100% likely. At least that is how I viewed it.
Well they did name Oscar and that was a stretch. Invest 97L is likely a depression and should/hopefully be classified at 11am.
Why are they doing this?
WHY YOU DON'T ISSUE ADVISORIES???? Who has that pic by the way?
Well if the severe risk is possibly higher than a slight risk, which is what they're saying, then it would be upgraded to a MDT risk.
It could. However, considering Kerr wrote it, I wouldn't bet on it.
Forecaster Kerr = SPC's Forecast Stewart.
Viewing: 501 - 515
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