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Post-Tropical Cyclone Larry Forecast Discussion Number 44
2021-09-11 16:38:06| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Sat Sep 11 2021 000 WTNT42 KNHC 111437 TCDAT2 Post-Tropical Cyclone Larry Discussion Number 44 NWS National Hurricane Center Miami FL AL122021 1100 AM AST Sat Sep 11 2021 Satellite images indicate that Larry has completed its transition to a post-tropical cyclone with most of the deep convection dissipating near the low-level center and frontal features developing. In addition, the low- and mid-level centers are now well separated, and the cyclone appears a little weaker. The initial intensity is estimated to be 60 kt. The post-tropical system is very large and gale-force winds and high seas extend far from the center. It is interesting to note that up to just several hours ago Larry had maintained an inner core and a fairly tropical appearance despite being at very high latitudes and over quite cold water. Larry is racing northeastward, with the initial motion estimated to be 030/42 kt. The storm is expected to merge with another large extratropical low tonight or early Sunday. This is the last NHC advisory on Larry. For more information on this system, see High Seas Forecasts issued by the National Weather Service, under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and online at ocean.weather.gov/shtml/NFDHSFAT1.php Key Messages: 1. Large swells generated by Post-Tropical Cyclone Larry will continue to affect portions of the the east coast of the United States and Atlantic Canada through tonight. These swells will cause life-threatening surf and rip current conditions, and beachgoers and other interests along these coasts are urged to follow the guidance of lifeguards and local officials. FORECAST POSITIONS AND MAX WINDS INIT 11/1500Z 54.0N 48.2W 60 KT 70 MPH...POST-TROPICAL 12H 12/0000Z 57.8N 44.9W 55 KT 65 MPH...POST-TROP/EXTRATROP 24H 12/1200Z...DISSIPATED $$ Forecaster Cangialosi
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