Tropical Storm Bonnie Makes Her Debut
Hi everybody, this is Dr. Rob Carver filling in for Jeff on the late shift.
Based on information from Hurricane Hunters, the National Hurricane Center upgraded TD Three to Tropical Storm Bonnie. As of the 11PM EDT advisory, Bonnie was at 23.4N, 76.5W which is 285 miles southeast of Miami, Florida. Bonnie has maximum winds of 40 mph, a minimum central pressure of 1007 mb, and is moving to the northwest at 14 mph. Bonnie will pass over the Everglades/Florida Keys Friday and cross into the Gulf of Mexico Friday night/early Saturday morning. Tropical storm warnings are in effect for both Florida coasts south of Lake Okeechobee to Key West.

Fig. 1 IR satellite image of Tropical Storm Bonnie at 1216AM EDT.
Threats
NHC is expecting 2-4 inches of rain over south Florida due to Bonnie and 3-5 inches over the Bahamas. They are forecasting a storm surge of 1-2 feet. Tropical storm force winds are expected in the Bahamas starting Thursday night, and they are forecast to arrive in southern Florida Friday morning.
Impacts and Emergency Preparedness
As of 1130PDT EDT, the Key West NWS office is indicating that there are no evacuation orders in effect or planned for Monroe County (the Keys). Small craft are being advised to stay in port and be well secured to their docks. Two shelters will be opened, Key West High School and Stanley Switlik Elementary School in Marathon.
Most of the ships at the Deepwater Horizon oil spill site and other skimming ships have been ordered to seek safe harbor. In the statement, Adm. Allen said ships that operate the ROVs will be the last out and the first back to keep the wellhead observations going as long as possible.
Forecast/Model Assessment
The track models and ensemble models show remarkably good agreement for Bonnie's path across south Florida and towards southeast Louisiana. The current intensity forecast calls for Bonnie to maintain strong tropical storm force winds (40-50 knots) until it makes landfall in Louisiana, with a 15% chance of becoming a hurricane before then. However, the global models (GFS, Canadian GEM, NOGAPS) and the hurricane dynamical models (GFDL, Navy GFDL, and HWRF) do not intensify Bonnie at all. The statistical models (SHIPS and LGEM) support the intensity forecast.
I'm inclined to take the predictions of global and dynamical models with a large grain of salt. When I reviewed the latest model runs (18Z and 12Z), it was apparent that none of the models had a good initialization of Bonnie's structure. Bonnie has a relatively small circulation, so it's easy for the models' initialization to act like there isn't much of a storm there. Without accurate starting conditions, any model will have trouble producing an accurate forecast. NHC has a good summary of the different forecast models they use.
Next Update
Jeff will have an update sometime Friday morning.
Reader Comments
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They should 24 break the hypsters who made calls based on fear mongering before doing it to someone who was dead right. The blog seems to punish those who don't spin to the side of hype. Maybe it has to do with CPM and web hits doing way better when rumor and fear are rampant.
You have to understand that this is a very compact, disorganized system that was just a rain maker for Florida. There are already 50 posts about people talking about this storm being pathetic. It's a factor of nature that should be respected. Take it as a warning for what the future can bring.
NATIONAL WEATHER SERVICE MIAMI FL
954 AM EDT FRI JUL 23 2010
INLAND BROWARD COUNTY FL-METRO BROWARD COUNTY FL-
METROPOLITAN MIAMI DADE FL-INLAND MIAMI-DADE FL-COASTAL MIAMI-
DADE COUNTY FL-
954 AM EDT FRI JUL 23 2010
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR COASTAL AND
METRO AREAS OF MIAMI-DADE COUNTY...
...FOR 45 TO 55 MPH WINDS...
...FOR FUNNEL CLOUDS...
AT 944 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE DETECTED
AN AREA OF STRONG WINDS OF UP TO 60 MPH ALONG A LINE EXTENDING FROM
11 MILES EAST OF KEY BISCAYNE TO 12 MILES SOUTH OF KEY
BISCAYNE...MOVING NORTHWEST AT 45 MPH. THESE WINDS ARE ASSOCIATED
WITH A PORTION OF THE SPIRAL BAND NORTH OF THE CENTER AND MAY BE
DRIVEN TO THE SURFACE BY THE STRONG CONVECTION ASSOCIATED WITH IT.
THIS AREA OF STRONG WINDS WILL AFFECT...
KEY BISCAYNE...
MIAMI BEACH...
BAY HARBOR ISLANDS...
LITTLE HAITI...
OPA-LOCKA...
MIAMI LAKES...
AND SURROUNDING COMMUNITIES.
THE PRIMARY IMPACTS WILL BE GUSTY WINDS OF 45 TO 55 MPH. THESE WINDS
CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED
SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM
PASSES.
ALSO...THIS SPIRAL BAND IS ALSO IN AN ENVIRONMENT FAVORABLE FOR
FUNNEL CLOUDS AND TORNADOES.
RESIDENTS NEAR THE PATH OF THESE STORMS SHOULD REMAIN ON THE ALERT
FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.
HA! Good one.
I'll admit I missed the track by 3 football fields. :)
take this as a blessing i much rather have this over us than hati or DR
I've driven through thunderstorms worse than this !!
AMEN Brother.
er, NEW Blog Homies
Twig-caster!
Leaf-caster!
Worth reposting why? Self-aggrandizing, non-scientific whining repeated is still just self-aggrandizing, non-scientific whining, isn't it?
red alert, put head between knees and math book over head now! lol
Naa, the shear map shows the marginal conditions closing over Bonnie, should be a depression by 2 or 5 p.m. The fact that recon still seeing TS winds shows me it will still be TS Bonnie by 11 a.m.
OMG! That's unprecedented.
LOL, Just wait till we get into the peak of the season!
I'm pretty sure the state of emergency has to do more with the oil thats prolly gonna wash ashore and not necessarily just Bonnie
Yeah, Jeffs a nobody who made a lucky guess a couple days ago and then relentlessly grand-standed about how they "called it" blah blah trying to demand respect as if he has a major Napolean complex. Probably change his user ID today. Hurrkat is someone to watch next time IMO. I hate the CAPS but they nailed it.
its about the oil coming in, not the storm itself
I agree..
Showing up on the Base Radial Veloctiy:
Link
also she predicted that Bonnie would never happen
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