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Tropical Storm Jerry Forecast Discussion Number 4

2019-09-18 11:07:07| National Hurricane Center (Atlantic)

Issued at 500 AM AST Wed Sep 18 2019 ZCZC MIATCDAT5 ALL TTAA00 KNHC DDHHMM Tropical Storm Jerry Discussion Number 4 NWS National Hurricane Center Miami FL AL102019 500 AM AST Wed Sep 18 2019 Enhanced BD-curve infrared imagery and a 0431 UTC AMSR2 microwave pass indicate that the cyclone has become better organized during the pass several hours. Although the surface center is still situated near the northeastern edge of the convective mass, the deep convection has expanded in the form of curve bands in the south portion of the cyclone. Based on the increased subjective and objective satellite intensity estimates, and the improved microwave presentation, the initial intensity is raised to 40 kt making the system the tenth named storm of the season. Even though the shear is low and the sea surface temperatures are warm, GOES-16 sounder data and the GFS/ECMWF SHIPS intensity models indicate that the environment surrounding the cyclone is still a little dry and stable. Therefore, only gradual intensification is forecast. The shear is forecast to increase after 24 hours or so, to the point where it should slow, or halt development, and this is reflected in the official forecast. It should be noted that the forecast still calls for the cyclone to become a hurricane as it approaches the northern Leeward Islands. The initial motion is estimated to be west-northwestward, or 290/11 kt, within the low to mid-tropospheric steering flow produced by a subtropical ridge to the north of the tropical storm. This general motion is expected to continue during the next 3 to 4 days. Afterward, a northwest to north-northwestward turn, influenced by a growing weakness in the aforementioned ridge, is expected. The NHC track forecast is basically an update from the previous advisory and lies in the middle of the guidance suite, and hedged toward the HCCA multi-model consensus. Key Messages: 1. Jerry is expected to strengthen and be a hurricane when its moves near the northern Leeward Islands Friday, although it is too soon to determine if there will be any direct impacts in the islands. Interests there should ensure they have their hurricane plan in place and monitor the progress of this system. FORECAST POSITIONS AND MAX WINDS INIT 18/0900Z 14.1N 47.7W 40 KT 45 MPH 12H 18/1800Z 14.8N 49.4W 45 KT 50 MPH 24H 19/0600Z 15.7N 52.0W 55 KT 65 MPH 36H 19/1800Z 16.8N 54.9W 60 KT 70 MPH 48H 20/0600Z 17.9N 57.9W 65 KT 75 MPH 72H 21/0600Z 20.2N 64.2W 65 KT 75 MPH 96H 22/0600Z 22.8N 68.6W 65 KT 75 MPH 120H 23/0600Z 25.6N 70.2W 65 KT 75 MPH $$ Forecaster Roberts NNNN

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Tropical Storm Jerry Graphics

2019-09-18 11:03:45| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Wed, 18 Sep 2019 09:03:45 GMT Wind Speed Probabilities last updated Wed, 18 Sep 2019 09:32:16 GMT

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Summary for Tropical Storm Jerry (AT5/AL102019)

2019-09-18 10:58:56| National Hurricane Center (Atlantic)

...JERRY BECOMES THE TENTH NAMED STORM OF THE 2019 SEASON... As of 5:00 AM AST Wed Sep 18 the center of Jerry was located near 14.1, -47.7 with movement WNW at 13 mph. The minimum central pressure was 1004 mb with maximum sustained winds of about 45 mph.

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Tropical Storm Jerry Forecast Advisory Number 4

2019-09-18 10:58:08| National Hurricane Center (Atlantic)

Issued at 0900 UTC WED SEP 18 2019 ZCZC MIATCMAT5 ALL TTAA00 KNHC DDHHMM TROPICAL STORM JERRY FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL102019 0900 UTC WED SEP 18 2019 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN THE NORTHERN LEEWARD ISLANDS SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 14.1N 47.7W AT 18/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1004 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 40NE 30SE 30SW 40NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 14.1N 47.7W AT 18/0900Z AT 18/0600Z CENTER WAS LOCATED NEAR 13.9N 47.2W FORECAST VALID 18/1800Z 14.8N 49.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 50NE 50SE 30SW 50NW. FORECAST VALID 19/0600Z 15.7N 52.0W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 20NE 20SE 0SW 20NW. 34 KT... 50NE 50SE 30SW 50NW. FORECAST VALID 19/1800Z 16.8N 54.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 30SE 20SW 30NW. 34 KT... 60NE 60SE 40SW 60NW. FORECAST VALID 20/0600Z 17.9N 57.9W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 10NE 0SE 0SW 0NW. 50 KT... 30NE 30SE 20SW 30NW. 34 KT... 70NE 60SE 40SW 60NW. FORECAST VALID 21/0600Z 20.2N 64.2W MAX WIND 65 KT...GUSTS 80 KT. 50 KT... 40NE 30SE 20SW 30NW. 34 KT... 80NE 60SE 40SW 60NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 22/0600Z 22.8N 68.6W MAX WIND 65 KT...GUSTS 80 KT. OUTLOOK VALID 23/0600Z 25.6N 70.2W MAX WIND 65 KT...GUSTS 80 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 14.1N 47.7W NEXT ADVISORY AT 18/1500Z $$ FORECASTER ROBERTS NNNN

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