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Tropical Depression Peter Forecast Discussion Number 16
2021-09-22 16:53:34| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Wed Sep 22 2021 000 WTNT41 KNHC 221453 TCDAT1 Tropical Depression Peter Discussion Number 16 NWS National Hurricane Center Miami FL AL162021 1100 AM AST Wed Sep 22 2021 Peter is barely hanging on to its status as a tropical cyclone this morning. While still closed, the low-level circulation continues to look increasingly diffuse on satellite imagery. In addition, the convective activity, which lacks much organization, remains displaced well to the northeast by moderate to strong southwesterly vertical wind shear. A blend of the latest subjective satellite intensity estimates support keeping Peter as a 30-kt tropical depression this advisory. As has been the story for the last few days, Peter will continue to deal with a lethal combo of 25-35 kt southwesterly vertical wind shear while embedded in a relatively dry mid-level air environment. These factors should ultimately lead to Peter's demise as a tropical cyclone, with the latest NHC intensity forecast moving the timing up for post-tropical remnant low status to 24 hours. This degeneration could occur as soon as this afternoon if more organized convection does not soon return near the center. Alternatively, Peter may also open up into a trough at any time since the center continues to gradually lose definition. Similar to prior nights, Peter made another jog to the left after overnight convection diminished near the center. More recently, the depression has begun a slow north-northwestward motion estimated at 330/6 kt. The cyclone is expected to turn northward and then northeastward over the next 24 hours as low-level ridging breaks down south of a deep-layer trough located near Bermuda. The NHC track forecast early on is a bit west of the previous one due to the leftward initial position, but falls in line to a similar track after 24 hours, continuing to split the difference between the GFS and ECMWF models. As Peter moves poleward away from Puerto Rico, Hispaniola, and the Virgin Islands, the threat of heavy rainfall for these regions associated with the system has diminished. FORECAST POSITIONS AND MAX WINDS INIT 22/1500Z 21.6N 66.9W 30 KT 35 MPH 12H 23/0000Z 22.3N 67.2W 30 KT 35 MPH 24H 23/1200Z 23.3N 67.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 24/0000Z 24.2N 66.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 24/1200Z 25.1N 66.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 25/0000Z 26.3N 65.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 25/1200Z...DISSIPATED $$ Forecaster Papin
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Tropical Depression Peter Graphics
2021-09-22 16:45:08| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Wed, 22 Sep 2021 14:45:08 GMT Wind Speed Probabilities last updated Wed, 22 Sep 2021 14:45:08 GMT
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Summary for Tropical Depression Peter (AT1/AL162021)
2021-09-22 16:43:04| National Hurricane Center (Atlantic)
...PETER BARELY HANGING ON AS A TROPICAL CYCLONE... As of 11:00 AM AST Wed Sep 22 the center of Peter was located near 21.6, -66.9 with movement NNW at 7 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 35 mph.
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Tropical Depression Peter Public Advisory Number 16
2021-09-22 16:43:04| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Wed Sep 22 2021 000 WTNT31 KNHC 221442 TCPAT1 BULLETIN Tropical Depression Peter Advisory Number 16 NWS National Hurricane Center Miami FL AL162021 1100 AM AST Wed Sep 22 2021 ...PETER BARELY HANGING ON AS A TROPICAL CYCLONE... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...21.6N 66.9W ABOUT 225 MI...365 KM NNW OF SAN JUAN PUERTO RICO MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...NNW OR 330 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM AST (1500 UTC), the center of Tropical Depression Peter was located near latitude 21.6 North, longitude 66.9 West. The depression is moving toward the north-northwest near 7 mph (11 km/h). A turn to the north is expected by tonight, followed by a north-northeastward or northeastward motion through the end of the week. On the forecast track, the center of Peter will continue moving away from the Virgin Islands and Puerto Rico. Maximum sustained winds remain near 35 mph (55 km/h) with higher gusts. Gradual weakening is expected during the next couple of days, and Peter is forecast to degenerate into a remnant low on Thursday. The estimated minimum central pressure is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- SURF: Swells generated by Peter are affecting the Virgin Islands, Puerto Rico, and Hispaniola, and will continue spreading westward to the Bahamas later today. These swells could cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 500 PM AST. $$ Forecaster Papin
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Tropical Depression Peter Wind Speed Probabilities Number 16
2021-09-22 16:43:04| National Hurricane Center (Atlantic)
Issued at 1500 UTC WED SEP 22 2021 000 FONT11 KNHC 221442 PWSAT1 TROPICAL DEPRESSION PETER WIND SPEED PROBABILITIES NUMBER 16 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 1500 UTC WED SEP 22 2021 AT 1500Z THE CENTER OF TROPICAL DEPRESSION PETER WAS LOCATED NEAR LATITUDE 21.6 NORTH...LONGITUDE 66.9 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 12Z WED AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 12Z WED 00Z THU 12Z THU 00Z FRI 12Z FRI 12Z SAT 12Z SUN PERIODS TO TO TO TO TO TO TO 00Z THU 12Z THU 00Z FRI 12Z FRI 12Z SAT 12Z SUN 12Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER PAPIN
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