Felicia not weakening; new African wave may develop
Hurricane Felicia has not weakened today, and continues to hold its own in spite of cool sea surface temperatures beneath it. Recent satellite imagery shows that the tops of thunderstorms surrounding the eye have cooled slightly, indicating that the updrafts sustaining the eyewall are maintaining their strength. The appearance of the hurricane has improved some today, with the storm assuming a more symmetric appearance.
Figure 1. Current satellite image of Hurricane Felicia.
Sea surface temperatures (SSTs) under Felicia have now fallen to 24.7°C, well below the 26°C threshold typically needed to sustain a hurricane. SSTs will slowly increase to 26°C by the time the storm reaches Hawaii, though. Wind shear is expected to remain low to moderate, 5 - 15 knots, through Monday morning. By Monday night, shear will rise to 20 knots, and remain above 20 knots thereafter. The higher shear combined with the relatively cool SSTs should mean that Felicia will be rapidly weakening in its final 24 hours before reaching Hawaii. Several of the computer models continue to show that this shear will be high enough to tear Felicia apart before it reaches Hawaii, though it appears to me that Felicia's current strength and annular structure will help it resist the shear enough to allow the storm to hit Hawaii as a tropical depression with 35 mph winds. Regardless, Felicia will bring heavy rain Hawaii beginning on Monday morning, and these rains will have the capability of causing flash floods and mudslides. The Hurricane Hunters are scheduled to make their first low-level investigation of Felicia this afternoon (around 10 am Hawaiian time). The NOAA jet also flies into Felicia today, and will drop a series of dropsondes that will be used to gather data that will be fed into today's 12Z and 00Z computer model runs.
Typhoon Morakot hits Taiwan
Typhoon Morakot hit Taiwan yesterday, battering the island with Category 1 winds and heavy rain. The Taipei airport recorded sustained winds of 56 mph, gusting to 76 mph, at the peak of the storm. Morakot killed 6 on Taiwan and 10 in the Philippines, and is headed towards a final landfall on mainland China as a tropical storm later today. Storm chaser James Reynolds intercepted the storm and posted videos on typhoonfury.com and Youtube. Morakot is still visible today on Taiwan radar.
Figure 2. Visible satellite image of a spinning tropical wave leaving the coast of Africa. The image was taken at 8am EDT 8/8/09.
African tropical wave may develop
A strong tropical wave with a moderate amount of spin is moving off the coast of Africa this morning. The wave is under about 10 - 20 knots of wind shear and has sea surface temperatures beneath it of 27°C. These conditions are probably too marginal to allow development over the next two days. As the wave moves westward away from Africa over the next few days, wind shear should slowly decrease and the SSTs will warm, potentially allowing for some slow development. The UKMET, GFS, and NOGAPS models all indicate the possibility that this will become a tropical depression 3 - 5 days from now. The ECMWF model forecasts that strong easterly winds over the wave will create too much shear to allow development. The wave is well south of the Saharan Air Layer, so dry air and African dust should not interfere over the next 3 - 5 days. I give the wave a medium (30 - 50% chance) of developing into a tropical depression in the next seven days.
I'll have an update on Sunday.
Jeff Masters
Reader Comments
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So why even make the statement and mention south florida if its a less than 1% chance, people tend to overreact here
August wont dissapoint the wunderground nor the Basin.
Been watching that throughout the morning and now early afternoon since it does appear to have a good mid-level circulation. With the unusually warm Gulf waters, you have to watch anything there.
All he said was that it was favorable for a South Florida landfall. He was answering the question. He knows there are many other possibilities but a threat towards Florida definitely has a chance with the current set-up.
Why even mention that lol
The GFS model is a wishcaster's paradise LOL.
jajajajaja
Link
LOL And?
People overreacting is their choice, not mines.
Hi StormW,
I'm a lurker and don't post much but I wanted to say thanks for your insightful and easy to understand updates. So, what's your take "Mother Nature's little cautionary sign"? Not asking for anything in-depth . . .
The weather at 11n 61w Trinidad now...
temp 77f
humid. 94%
wind WSW 7 mph
press. 1015 falling
rainfall yesterday, Airport .94 inches.
Expected more rain from all of that. It was only 1/4" at my house 12 miles south of the Airport.
Reports from south trinidad, 9 homeless after high wind took 4 roofs and brought down some trees.
I lost a large Bauhinia tree (now that I can see them, the roots are not healthy). But the wind here was obviously not as strong as south of here.
Heavy rains last night and this morning, in brief showers. 3/4" since midnight.
Water cisterns are overflowing for the first time this year. About time, too.
That could quite possibly be the most impressive and promising tropical wave coming off Africa thus far this season. With such a vigorous mid-level circulation, absence of SAL, and improving upper level conditions, this is the first wave all season that I'm going to forecast development with into a tropical cyclone. Don't see anything preventing development with this wave. Really impressive.
Maybe we can get an ant report to really solidify things? LOL j/k
Because it is a possiblity Drak....it is a possibility
I also can attest to this. Not too often that I hear the interstate traffic this time of year, ehich is just north of me. Normally those sounds are Autumn and Winter. Dew point has been a tad lower too, although not to winter levels.
Along with sat and surface obs, i do believe something is at the surface.
Coriolis Effect already?
Link
vigorous waves like these can recieve the Coriolis effect early on but I don't think there is an established low level circulation.
1 degree curve band. If it was an invest, I don't think it would be considered "TOO WEAK"
EP 90 2009080818 BEST 0 137N 1174W 25 0 DB
Dakar sounding from a few hrs ago had what appears to bo some south-southwesterly winds at the surface.
Did you see the part which said "...forecast accuracy < 1%..."?!?!?!?!?! so...no....not "really"...
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