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Computer Model Trends: Tropical Storm Andrea

We have been advertising an early-season tropical system for weeks, so when (pat on back) Tropical Storm Andrea formed Wednesday evening in the Gulf of Mexico it should have come as no surprise. The storm was looking pretty wound up as it approached the Florida Panhandle Thursday morning. Winds were up to 60 mph, and there was at least one reported tornado in Florida as squally rain bands moved onshore. Here are some of the latest thoughts regarding the evolution of and impact from Andrea.

HWRF Hurricane Model precipitation forecast – a large swath of 1.5-3″ rain totals up the Eastern Seaboard

ECMWF deterministic model with a storm total of 1.5-3.5″ for SNE – enough to cause some street, stream, and possibly river flooding

ECMWF shows heavy rain late Friday night. This forecast is for 2am-8am Saturday. 1-1.5″ in most of RI, E CT, and interior SE MA

ECMWF – rain shuts off very quickly after 8 am Saturday

European Ensemble Prediction System has a widespread 2-2.5″ in most of SNE

GFS showing the storm moving into the Gulf of Maine by midday Saturday

Canadian rain totals are down from where they were a couple of days ago, but still significant at 2-3″

Canadian model has the storm accelerating out of the picture Saturday morning

The latest NAM model has the storm pulling away from SNE very quickly Saturday morning. That’s good since the NAM had been an outlier with a slower track.

NOAA Weather Prediction Center has a bullseye of very heavy rain over SNE. This is at the higher end of the computer model suite.

Another look at the consensus of hurricane models

Hurricane model consensus is over or east of SNE. Notice the timing, too. The 48 indicates where the center of the storm will be at 8am Saturday
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