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Tropical Storm Peter Forecast Discussion Number 3

2021-09-19 14:53:52| National Hurricane Center (Atlantic)

Issued at 900 AM AST Sun Sep 19 2021 000 WTNT41 KNHC 191253 TCDAT1 Tropical Storm Peter Special Discussion Number 3 NWS National Hurricane Center Miami FL AL162021 900 AM AST Sun Sep 19 2021 Satellite imagery as well as data from a Air Force Reserve Hurricane Hunter aircraft indicate that the center of Peter is over 100 n mi west-southwest of its forecast position. Therefore, a special advisory for track is being issued. The forecast track has been adjusted through the first 60 h, resulting in a slight southward adjustment of the track through the first couple of days. The aircraft also measured 925 mb flight-level winds of 56 kt, which supports an initial intensity of 40 kt. No adjustments were made to the intensity forecast. The next full advisory will be issued at 1500 UTC. Based on the track, intensity, and wind radii forecast, no tropical storm watches or warnings are required for the northern Leeward Islands, Virgin Islands or Puerto Rico. However, interests there should monitor the progress of the system as locally heavy rain is possible on Monday and Tuesday when it is expected to pass to the north of the area. Key Messages: 1. Rainfall around the southern periphery of Tropical Storm Peter may lead to areas of urban and small stream flooding from late Sunday into Tuesday across Puerto Rico, the Virgin Islands, and the Northern Leeward Islands. FORECAST POSITIONS AND MAX WINDS INIT 19/1300Z 17.6N 56.0W 40 KT 45 MPH 12H 19/1800Z 18.2N 57.0W 40 KT 45 MPH 24H 20/0600Z 19.3N 58.8W 40 KT 45 MPH 36H 20/1800Z 20.2N 61.1W 40 KT 45 MPH 48H 21/0600Z 21.3N 63.2W 35 KT 40 MPH 60H 21/1800Z 22.6N 65.0W 35 KT 40 MPH 72H 22/0600Z 24.3N 65.6W 35 KT 40 MPH 96H 23/0600Z 25.8N 65.6W 35 KT 40 MPH 120H 24/0600Z 27.7N 65.2W 35 KT 40 MPH $$ Forecaster Latto

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Tropical Storm Peter Forecast Advisory Number 3

2021-09-19 14:47:52| National Hurricane Center (Atlantic)

Issued at 1300 UTC SUN SEP 19 2021 192 WTNT21 KNHC 191247 TCMAT1 TROPICAL STORM PETER SPECIAL FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 1300 UTC SUN SEP 19 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN THE NORTHERN LEEWARD ISLANDS...VIRGIN ISLANDS...AND PUERTO RICO SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 17.6N 56.0W AT 19/1300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 90NE 40SE 0SW 0NW. 12 FT SEAS..120NE 0SE 0SW 90NW. 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 17.6N 56.0W AT 19/1300Z AT 19/0600Z CENTER WAS LOCATED NEAR 17.0N 53.8W FORECAST VALID 19/1800Z 18.2N 57.0W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 90NE 40SE 0SW 40NW. FORECAST VALID 20/0600Z 19.3N 58.8W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 90NE 40SE 0SW 50NW. FORECAST VALID 20/1800Z 20.2N 61.1W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 90NE 50SE 0SW 50NW. FORECAST VALID 21/0600Z 21.3N 63.2W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 90NE 50SE 0SW 50NW. FORECAST VALID 21/1800Z 22.6N 65.0W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 80NE 40SE 0SW 0NW. FORECAST VALID 22/0600Z 24.3N 65.6W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 70NE 40SE 0SW 0NW. 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 23/0600Z 25.8N 65.6W MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 24/0600Z 27.7N 65.2W MAX WIND 35 KT...GUSTS 45 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 17.6N 56.0W NEXT ADVISORY AT 19/1500Z $$ FORECASTER LATTO

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Tropical Depression Seventeen Forecast Discussion Number 1

2021-09-19 10:59:49| National Hurricane Center (Atlantic)

Issued at 800 AM CVT Sun Sep 19 2021 000 WTNT42 KNHC 190859 TCDAT2 Tropical Depression Seventeen Discussion Number 1 NWS National Hurricane Center Miami FL AL172021 800 AM CVT Sun Sep 19 2021 The small low pressure system that the NHC has been tracking the past few days has acquired a well-defined circulation and enough organized deep convection to be classified as a tropical depression. The initial intensity of 30 kt is based on 0000 UTC ASCAT wind data of about 30 kt. This intensity is also supported by consensus Dvorak satellite classifications of T2.0/30 kt from TAFB and SAB. The initial motion estimate is north-northwestward or 330/12 kt. The small cyclone is forecast to move in a general northwestward direction throughout the remainder of the forecast period as the system moves along the southwestern and western periphery of a subtropical ridge that extends westward from Africa across the Cabo Verde Islands. The NHC forecast track lies down the middle of the tightly packed track models. Only modest strengthening is expected during the next 48 hour so while the small cyclone remains over 27-28 deg C sea-surface temperatures and the vertical wind shear decreases to near 5 kt during that time. However, proximity to dry air is expected prevent any significant strengthening from occurring. By late Tuesday, a slow weakening trend is forecast to begin as the system moves over cooler water and the shear increases from the southwest. The NHC intensity forecast closely follows a blend of the IVCN and HCCA intensity consensus models through 72 hours, and then is lower than the HCCA model on days 4 and 5. FORECAST POSITIONS AND MAX WINDS INIT 19/0900Z 11.8N 28.2W 30 KT 35 MPH 12H 19/1800Z 13.4N 29.2W 35 KT 40 MPH 24H 20/0600Z 15.5N 31.2W 40 KT 45 MPH 36H 20/1800Z 17.6N 33.2W 40 KT 45 MPH 48H 21/0600Z 19.7N 34.7W 35 KT 40 MPH 60H 21/1800Z 21.7N 36.1W 35 KT 40 MPH 72H 22/0600Z 23.2N 37.2W 30 KT 35 MPH 96H 23/0600Z 25.6N 39.6W 30 KT 35 MPH 120H 24/0600Z 28.1N 41.5W 30 KT 35 MPH $$ Forecaster Stewart

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Tropical Storm Peter Forecast Discussion Number 2

2021-09-19 10:49:47| National Hurricane Center (Atlantic)

Issued at 500 AM AST Sun Sep 19 2021 389 WTNT41 KNHC 190849 TCDAT1 Tropical Storm Peter Discussion Number 2 NWS National Hurricane Center Miami FL AL162021 500 AM AST Sun Sep 19 2021 Deep convection has increased since the previous advisory, with the convective cloud pattern having taken on a more curved-band configuration compared to the earlier shear pattern. Satellite intensity estimates from TAFB and SAB support increasing the intensity to 35 kt. In addition, earlier ASCAT passes, which missed the center of circulation, did reveal 30-kt winds west of the center in convection-free areas. Thus, it is reasonable to assume that stronger winds are occurring within the deep convection east of the center, which further supports upgrading the system to Tropical Storm Peter with a 35-kt intensity. The initial estimate is an uncertain 305/13 kt. Peter has made a slight jog to the north-northwest since the previous advisory, but this is likely a short-term motion owing to the center redeveloping farther to the north and east into the deep convection. However, a west-northwestward motion is expected to resume later today. Thereafter, the cyclone is forecast to maintain a west-northwestward motion through Wednesday as Peter moves around the southwestern periphery of a strong deep-layer subtropical ridge. On Thursday and Friday, Peter is forecast to turn northward into a weakness in the ridge induced by the large Post-Tropical Cyclone Odette. The new forecast track has been shifted slightly to the right or north of the previous advisory track, mainly due to the more northward initial position, and lies close to the consensus track models TVCA and HCCA. Some strengthening is forecast during the next 24 hours or so as Peter moves over warmer sea-surface temperatures of about 29 deg C. However, proximity to very dry mid-level air and moderate deep-layer southwesterly vertical wind shear are expected to prevent any significant or rapid strengthening. By early Tuesday and beyond, slow weakening is expected to begin due to increasing wind shear. The new official NHC intensity forecast is very similar to the previous advisory, and closely follows a blend of the IVCN and HCCA intensity consensus models. Based on the track, intensity, and wind radii forecast, no tropical storm watches or warnings are required for the northern Leeward Islands, Virgin Islands or Puerto Rico. However, interests there should monitor the progress of the system as locally heavy rain is possible on Monday and Tuesday when it is expected to pass to the north of the area. Key Messages: 1. Rainfall around the southern periphery of Tropical Storm Peter may lead to areas of urban and small stream flooding from late Sunday into Tuesday across Puerto Rico, the Virgin Islands, and the Northern Leeward Islands. FORECAST POSITIONS AND MAX WINDS INIT 19/0900Z 18.0N 53.5W 35 KT 40 MPH 12H 19/1800Z 18.8N 55.3W 40 KT 45 MPH 24H 20/0600Z 19.8N 57.8W 40 KT 45 MPH 36H 20/1800Z 20.8N 60.1W 40 KT 45 MPH 48H 21/0600Z 21.7N 62.2W 35 KT 40 MPH 60H 21/1800Z 22.7N 63.9W 35 KT 40 MPH 72H 22/0600Z 23.7N 64.9W 35 KT 40 MPH 96H 23/0600Z 25.8N 65.6W 35 KT 40 MPH 120H 24/0600Z 27.7N 65.2W 35 KT 40 MPH $$ Forecaster Stewart

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Tropical Depression Seventeen Forecast Advisory Number 1

2021-09-19 10:36:20| National Hurricane Center (Atlantic)

Issued at 0900 UTC SUN SEP 19 2021 000 WTNT22 KNHC 190836 TCMAT2 TROPICAL DEPRESSION SEVENTEEN FORECAST/ADVISORY NUMBER 1 NWS NATIONAL HURRICANE CENTER MIAMI FL AL172021 0900 UTC SUN SEP 19 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 11.8N 28.2W AT 19/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 330 DEGREES AT 12 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 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 11.8N 28.2W AT 19/0900Z AT 19/0600Z CENTER WAS LOCATED NEAR 11.3N 27.9W FORECAST VALID 19/1800Z 13.4N 29.2W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 30NE 30SE 0SW 0NW. FORECAST VALID 20/0600Z 15.5N 31.2W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 30NE 30SE 0SW 0NW. FORECAST VALID 20/1800Z 17.6N 33.2W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 21/0600Z 19.7N 34.7W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 21/1800Z 21.7N 36.1W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 22/0600Z 23.2N 37.2W MAX WIND 30 KT...GUSTS 40 KT. 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 23/0600Z 25.6N 39.6W MAX WIND 30 KT...GUSTS 40 KT. OUTLOOK VALID 24/0600Z 28.1N 41.5W MAX WIND 30 KT...GUSTS 40 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 11.8N 28.2W NEXT ADVISORY AT 19/1500Z $$ FORECASTER STEWART

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