You're not seeing double: TS Debby/Hurricane Isaac
By Ralph Fato on August 29, 2012, 9:04pm
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Map above is the 500mb level comparison of when Tropical Storm Debby was in the Gulf at the end of June and when Isaac was in the Gulf yesterday.
What led me to looking at this was the fact that Isaac came to a crawl as it got to the coast. So I remembered how Tropical Storm Debby was also crawling which produced widespread flooding in Florida with up to 20" of rain in spots.
The upper air setup in the U.S is extremely similar. Strong High Pressure over the center part of country, mini trough in Northwest, trough in the East. I believe even the Ridge in the Atlantic is similar.
This was one message from NHC during Debby:
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042012
700 PM CDT MON JUN 25 2012
...INLAND AND COASTAL FLOOD THREAT TO CONTINUE FOR THE NEXT COUPLE
OF DAYS ACROSS PORTIONS OF FLORIDA PANHANDLE AND NORTH FLORIDA...
LOCATION...29.1N 85.2W
ABOUT 30 MI...45 KM SSW OF APALACHICOLA FLORIDA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...STATIONARY
MINIMUM CENTRAL PRESSURE...992 MB...29.29 INCHES
This is the latest for Isaac:
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042012
400 PM CDT WED AUG 29 2012
...ISAAC PRODUCING LIFE-THREATENING HAZARDS FROM STORM SURGE AND
INLAND FLOODING AS IT MOVES SLOWLY ACROSS SOUTHEASTERN LOUISIANA...
LOCATION...30.0N 91.1W
ABOUT 35 MI...60 KM S OF BATON ROUGE LOUISIANA
ABOUT 60 MI...95 KM W OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...70 MPH
PRESENT MOVEMENT...NW AT 6 MPH
MINIMUM CENTRAL PRESSURE...975 MB...28.79 INCHES
Now lets take a look at the NAO.
