Fred dying; no immediate danger areas in the Atlantic
Tropical Storm Fred has been ripped apart by wind shear, as strong southerly winds of 20 knots have removed all of Fred's heavy thunderstorms, leaving only a naked low-level swirl of clouds. Wind shear of 20 - 40 knots will continue today through Monday, and Fred should dissipate by Sunday night. Due to the continued strong shear expected over Fred the next four days, it is unlikely there will be anything left of the storm to regenerate from once the remains reach an area with moderate wind shear five days from now.
Figure 1. Tropical Storm Fred (upper left) appears as a swirl of low-level clouds with no heavy thunderstorm activity in this morning visible satellite image. A new tropical disturbance (right) near the coast of Africa is disorganized, due to 20 - 30 knots of wind shear.
Elsewhere in the tropics
A large tropical wave that emerged from the coast of Africa Thursday is very disorganized. The wave as yet does not have much in the way of heavy thunderstorm activity associated with it, and wind shear is high, 20 - 30 knots. By Monday, the shear may drop below 20 knots, allowing some slow development. The GFS model has backed off on its prediction that this wave would develop into a tropical depression.
A low pressure system is over eastern Texas and the adjoining waters along the Texas Gulf of Mexico coast. This low is under high shear, about 25 knots, and is not tropical. Shear is expected to remain high, 20 - 30 knots, over the next five days. The low should remain non-tropical during this time, but will bring much-needed heavy rains to drought-stricken south Texas. Heavy rains in excess of five inches have occurred over portions of Texas, Oklahoma, and Louisiana from this low, and flash flood watches have been posted for a large sections of these states.
Over the next few days, we should also be alert for tropical storm development along a frontal zone stretching from the Gulf of Mexico waters offshore the western Florida coast, across the Florida Peninsula, to the waters between the Bahamas and North Carolina. However, wind shear will be relatively high in this region, and anything that develops may end up being extratropical in nature.
Figure 2. Total rainfall from the Austin, TX radar from the low pressure system over coastal Texas.
Twenty years ago on this date
On September 12, 1989, Tropical Storm Hugo, still far out at sea in the middle Atlantic, continued to grow more organized. Heavy thunderstorms thickened near the storm's center and in four prominent spiral bands. Updrafts from the intense thunderstorms near the storm's core began reaching the base of the stratosphere, creating high cirrus clouds that an upper-level anticyclone over the storm carried away. By nightfall, Hugo had intensified to a strong tropical storm with 65 mph winds. Now three days from the Lesser Antilles Islands, the storm continued to churn westward across the open Atlantic at 20 mph.
At NOAA's Miami-based Office of Aircraft Operations--the hurricane hunting division of NOAA--my boss, Jim McFadden, called me into his office. My fellow flight meteorologist, Jack Parrish, was also there. "We've got a planned two-plane deployment to Barbados on the 14th", Jim told us. "Frankly, if this storm wasn't named after the director of AOML, we wouldn't be going. It doesn't look too impressive right now." (AOML was NOAA's Atlantic Oceanographic and Marine Laboratory, which supervised research flights by NOAA's hurricane hunter aircraft, and Hugo Bezdek was the director). We discussed the possible missions, and agreed that regardless of Hugo's strength, we should be flying it, since we had used up very few of our allotted flight hours for the year. Jack and I would be in charge of coordinating the missions on the two aircraft. It would be my first hurricane flight of what had been a very slow season so far. I was excited to be going to Barbados, an island I had never been to. The as-yet unimpressive Tropical Storm Hugo did not give me any concerns about a possible rough ride.
Figure 3. AVHRR visible satellite image of Tropical Storm Hugo taken on September 12, 1989. Well-developed low-level spiral bands are apparent, and high cirrus clouds denoting upper-level outflow are visible on three sides. Image credit: Google Earth rendition of the NOAA HURSAT data base.
Jeff Masters
Reader Comments
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It is very humid and nasty here in South Louisiana. Forecast calls for 50% - 80% chance of rain all next week. Since I no longer have all of my sites to look at can someone catch me up on what's happening in the GOM?
TROPICAL WEATHER OUTLOOK
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
800 AM EDT SUN SEP 13 2009
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
THE AREA OF LOW PRESSURE THAT WAS LOCATED OVER THE NORTHWESTERN
GULF MEXICO HAS MOVED INLAND OVER EASTERN TEXAS. THIS SYSTEM IS
EXPECTED TO BRING LOCALLY HEAVY RAIN TO PORTIONS OF THE
SOUTH-CENTRAL UNITED STATES OVER THE NEXT FEW DAYS. FOR
ADDITIONAL INFORMATION ON THIS SYSTEM...SEE PRODUCTS ISSUED
BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE.
Thanks Ike! So now that it is inland, we will get rain, and lots of it from the way it sounds.
Don't know where in LA you are but this from Lake Charles.
.DISCUSSION...
UPPER AIR ANALYSIS AND WATER VAPOR SATELLITE IMAGERY SHOWED
MID/UPPER LOW SPINNING OVER CENTRAL TEXAS...WITH SMALLER LOBES OF
ENERGY ROTATING AROUND THE MAIN GYRE. WATER VAPOR IMAGERY ALSO
SHOWS A TONGUE OF RELATIVELY DRIER MID/UPPER LEVEL AIR THAT HAS
WRAPPED AROUND THE LOW INTO EAST TEXAS AND LOUISIANA.
AT THE SFC...LAND/BUOY OBSERVATIONS AND MSAS ANALYSIS SUGGEST THAT
TROUGH/WARM FRONTAL BOUNDARY STRETCHES FROM A BROAD SFC LOW NEAR
THE MIDDLE TX COAST EASTWARD ACROSS THE NEARSHORE WATERS.
YET ANOTHER ACTIVE DAY OF NUMEROUS SHOWERS AND THUNDERSTORMS
APPEARS ON TAP...WITH THE SYNOPTIC PATTERN HAVING CHANGED LITTLE
OVER THE PAST 24HRS. THE SFC WARM FRONT MADE ALMOST NO NORTHWARD
PROGRESS YESTERDAY AND OVERNIGHT...THOUGH THIS IS EXPECTED TO
FINALLY CHANGE TODAY. THE MID/UPPER LOW IS FORECAST TO BEGIN
SLOWLY LIFTING TO THE NORTHEAST TOWARD NORTH CENTRAL/NORTHEAST
TEXAS...WITH THE SFC LOW CREEPING NORTHEAST TOWARD SOUTHEAST
TEXAS. AS IT DOES SO...THE WARM FRONT WILL GRADUALLY LIFT
NORTHWARD...REACHING JUST NORTH OF THE HWY 190 CORRIDOR BY THIS
EVENING.
IN THE MEANTIME...LOBES OF ENERGY WILL CONTINUE TO PIVOT AROUND
THE MAIN MID/UPPER LEVEL LOW...SETTING OFF SEVERAL BURSTS OF
SHOWERS AND THUNDERSTORMS. LOCALLY HEAVY RAINFALL IS STILL A MAJOR
CONCERN TODAY...AS IS THE SLIM CHANCE OF A WEAK/SHORT LIVED
TORNADO...ESPECIALLY NEAR THE SFC BOUNDARY. CONTINUED TO
UNDERCUT NUMERICAL GUIDANCE FOR HIGH TEMPERATURES THIS
AFTERNOON WITH THE CONVECTIVE ACTIVITY AND CLOUD COVER
And there has to be SOME wx value to talking abt doughnuts.... lol
Morning, everybody....
They are fresh, they are delivered every morning from the closest Krispy Kreme Store.
LOL...
Good morning.
Weather doesn't look bad here so far today. Think I'll go push a lawnmower for a couple of hours....
for every upgrade theres a downgrade
the things you do for fun astound me
Ain't nobody else gonna do it. It needs doing anyway. I like to mow sometimes. Gives my mind a chance to think about things.
L8R.
Hurricane Lili (1990) possible track???
Thanks 451 and 456
It was a very interesting hybrid storm to watch and follow as it came north. I think that it should have at least been given an invest seeing it is still hurricane season. If it was latter in the year, it would have been labeled a nor easterly. Lets just be glad it happened in September and not in January. We would have snow measured in feet. Just my thoughts.
Meanwhile, in Nassau we have sunny skies, though the blue is that funny metallic-looking colour that makes u expect thunderstorms later on....
I expect we will get some further disturbed weather today.
Surley COFFEE can be a KK/weather event, sort of a swirll on top with the creamer. Looks kind of like EX fred right now?
I'm having a boiled egg and italian sausage myself.... while looking at the GOES interactive viewer. I'm not seeing much with this frontal system near us to make me think it's reasonable to expect anything to develop in our area....
Viewing: 901 - 918
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