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WTNT42 KNHC 220250
TCDAT2

Post-Tropical Cyclone Jose Discussion Number 67
NWS National Hurricane Center Miami FL AL122017
1100 PM AST Thu Sep 21 2017

The center of Jose has lacked deep convection for at least the past 12 hours. The cyclone now has the structure of an extratropical cyclone, with rain persisting in a shield that is displaced well to the west and northwest of the center. Based on this, Jose has been declared post-tropical. Surface observations from extreme southeast New England during the past 3 hours indicate that tropical storm conditions are persisting along the coast, and the tropical storm warnings in those locations remain in place. The National Hurricane Center will continue to issue advisories on Jose until the threat of tropical storm conditions along the coast has subsided.

The initial intensity has been held at 45 kt, based on a recent ASCAT pass that showed several 40-45 kt wind vectors in the NW quadrant. No change has been made to the intensity forecast, and Jose is still expected to gradually spin down over the cold waters of the North Atlantic for the next 3 days. Most of the global models still show the remnant low dissipating within 96 h.

Jose remains stuck in weak steering flow and has continued to drift slowly westward. Very little change has been made to the track forecast, and all of the global models show that the cyclone will continue to meander off the New England coast until it eventually dissipates around day 4. The NHC forecast remains close to the various track consensus aids.

Based on data from the aforementioned ASCAT pass, the wind radii were extended in the NW and NE quadrants. However this wind appears to be primarily occuring offshore, to the east of Cape Cod.



KEY MESSAGES:

1. Tropical-storm-force winds, especially in gusts, are occuring within the tropical storm warning area. These conditions are expected to continue through tonight.

2. Minor coastal flooding is possible along portions of the coast of southern New England during the next few days. Please see products issued by local National Weather Service forecast offices.

3. Swells generated by Jose are affecting Bermuda and much of the U.S. east coast, and will likely cause dangerous surf and rip current conditions for the next couple of days in these areas.



FORECAST POSITIONS AND MAX WINDS

INIT 22/0300Z 39.5N 68.4W 45 KT 50 MPH...POST-TROPICAL 12H 22/1200Z 39.6N 68.7W 40 KT 45 MPH...POST-TROPICAL 24H 23/0000Z 39.5N 69.0W 40 KT 45 MPH...POST-TROPICAL 36H 23/1200Z 39.3N 68.5W 35 KT 40 MPH...POST-TROPICAL 48H 24/0000Z 39.1N 67.3W 30 KT 35 MPH...POST-TROP/REMNT LOW 72H 25/0000Z 38.8N 66.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 26/0000Z...DISSIPATED

$$ Forecaster Zelinsky

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