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630
WTNT45 KNHC 190235
TCDAT5

Post-Tropical Cyclone Joyce Discussion Number 26
NWS National Hurricane Center Miami FL AL102018
1100 PM AST Tue Sep 18 2018

During the past couple of days, Joyce had been producing patches of deep convection that would quickly shear off due to strong westerly winds aloft. Each convective burst appeared weaker than the previous one, and during the past 12-18 hours, the circulation has been nearly devoid of deep convection. Therefore, Joyce no longer meets the criteria of a tropical cyclone, and this is the last advisory issued by the National Hurricane Center on this system. The initial wind speed is held at 25 kt, in agreement with a recent ASCAT pass around 2200Z that showed maximum winds in the 20-25 kt range. The remnant low is expected to gradually weaken and ultimately dissipate in a couple of days due to dry and stable air, cool SSTs, and moderate to strong westerly shear.

Joyce is moving south-southwestward at 7 kt on the east side of a low- to mid-level ridge. A turn to the southwest is expected on Wednesday as the ridge builds to the northeast of the cyclone, and that motion should continue until the remnant low dissipates. The NHC track forecast lies near the middle of the guidance envelope.

FORECAST POSITIONS AND MAX WINDS

INIT 19/0300Z 30.4N 27.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 12H 19/1200Z 29.9N 28.7W 20 KT 25 MPH...POST-TROP/REMNT LOW 24H 20/0000Z 29.4N 29.9W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 20/1200Z 28.9N 31.5W 15 KT 15 MPH...POST-TROP/REMNT LOW 48H 21/0000Z...DISSIPATED

$$ Forecaster Cangialosi



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