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Tropical Storm Peter Forecast Discussion Number 12
2021-09-21 16:57:08| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Tue Sep 21 2021 000 WTNT41 KNHC 211457 TCDAT1 Tropical Storm Peter Discussion Number 12 NWS National Hurricane Center Miami FL AL162021 1100 AM AST Tue Sep 21 2021 Like the last several days, this morning's visible satellite imagery indicates that Peter has become increasingly detached from the remaining fragmented convection that is firing more than 100 n mi east of the center. An Air Force Reserve Reconnaissance aircraft has been sampling the storm this morning and so far has yet to find any flight level (925 mb) or SFMR winds above tropical storm force, although they weren't able to fly the full pattern in the northeastern quadrant. The initial intensity has been lowered to 35 kt for this advisory, though the data so far suggests this estimate is generous. After taking a jog to the west overnight, Peter appears to have resumed a slower west-northwest motion at 290/8 kt. Over the next several days, Peter is expected to continue to slow down as it gradually turns to the north and then north-northeast as a deep-layer cyclone to the north is forecast to create a weakness in the current low-level ridging. The track guidance is in general agreement with this scenario, but differences remain in how sharp this rightward turn will be. The latest NHC track forecast has elected to stay close to the track consensus models TVCN and HCCA, and is a bit right of the previous track. After holding its own against a fairly hostile upper-level wind environment during the last 24-48 hours, Peter appears to finally be succumbing to the combination of 25-30 kt of deep-layer vertical wind shear helping to import sub-50 percent mid-level relative humidity over the center. This shear is not forecast to abate for the next 36-48 hours, and it now appears likely Peter will not be able to survive this unfavorable environment. The latest NHC intensity forecast now weakens Peter to a tropical depression in 12 hours, and degenerates it to a remnant low in 48 hours. However, given the current fragile state of the low-level circulation, it is distinctly possible that Peter may open up into a trough even sooner in the next 24-48 hours. Key Messages: 1. Rainfall around the southern periphery of Tropical Storm Peter could lead to areas of urban and small stream flooding through today across northern Hispaniola, Puerto Rico, portions of the Virgin Islands, and the Northern Leeward Islands. FORECAST POSITIONS AND MAX WINDS INIT 21/1500Z 19.9N 64.7W 35 KT 40 MPH 12H 22/0000Z 20.7N 65.7W 30 KT 35 MPH 24H 22/1200Z 21.7N 67.0W 30 KT 35 MPH 36H 23/0000Z 22.7N 67.5W 25 KT 30 MPH 48H 23/1200Z 23.4N 67.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 24/0000Z 24.4N 67.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 24/1200Z 25.4N 66.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 25/1200Z 27.5N 64.4W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 26/1200Z 29.8N 62.5W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Papin
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Summary for Tropical Storm Peter (AT1/AL162021)
2021-09-21 16:54:14| National Hurricane Center (Atlantic)
...PETER WEAKENING AS IT PASSES BY NORTH OF PUERTO RICO... As of 11:00 AM AST Tue Sep 21 the center of Peter was located near 19.9, -64.7 with movement WNW at 9 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Peter Public Advisory Number 12
2021-09-21 16:54:14| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Tue Sep 21 2021 000 WTNT31 KNHC 211454 TCPAT1 BULLETIN Tropical Storm Peter Advisory Number 12 NWS National Hurricane Center Miami FL AL162021 1100 AM AST Tue Sep 21 2021 ...PETER WEAKENING AS IT PASSES BY NORTH OF PUERTO RICO... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...19.9N 64.7W ABOUT 155 MI...255 KM NW OF THE NORTHERN LEEWARD ISLANDS ABOUT 140 MI...220 KM NE OF SAN JUAN PUERTO RICO MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- 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. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM AST (1500 UTC), the center of Tropical Storm Peter was located near latitude 19.9 North, longitude 64.7 West. Peter is moving toward the west-northwest near 9 mph (15 km/h). A west-northwest motion is expected to continue today. A turn to the north with a decrease in forward speed is expected beginning tomorrow. On the forecast track, the center of Peter is currently passing north of the Virgin Islands and Puerto Rico today and should move well east of the southeastern Bahamas during the next few days. Maximum sustained winds have decreased to near 40 mph (65 km/h) with higher gusts. Additional weakening is forecast over the next several days. Peter is expected to weaken to a tropical depression by tonight and then degenerate to a remnant low by Thursday. Tropical-storm-force winds extend outward up to 150 miles (240 km) from the center. The estimated minimum central pressure is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Rainfall around the southern periphery of Tropical Storm Peter could produce additional rainfall totals of 1 to 4 inches, with storm total accumulations up to 6 inches, across portions of the Northern Leeward Islands, including portions of the Virgin Islands, as well as Puerto Rico and the northern portions of Hispaniola through Thursday morning. This rainfall may lead to areas of urban and small stream flooding. SURF: Swells generated by Peter are affecting the northern Leeward Islands and Puerto Rico, and will continue spreading westward to Hispaniola later today and the Bahamas on Wednesday. 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 Storm Peter Wind Speed Probabilities Number 12
2021-09-21 16:54:14| National Hurricane Center (Atlantic)
Issued at 1500 UTC TUE SEP 21 2021 000 FONT11 KNHC 211454 PWSAT1 TROPICAL STORM PETER WIND SPEED PROBABILITIES NUMBER 12 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 1500 UTC TUE SEP 21 2021 AT 1500Z THE CENTER OF TROPICAL STORM PETER WAS LOCATED NEAR LATITUDE 19.9 NORTH...LONGITUDE 64.7 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 35 KTS...40 MPH...65 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 TUE 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 TUE 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT PERIODS TO TO TO TO TO TO TO 00Z WED 12Z WED 00Z THU 12Z THU 12Z FRI 12Z SAT 12Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER PAPIN
Tropical Storm Peter Forecast Advisory Number 12
2021-09-21 16:52:42| National Hurricane Center (Atlantic)
Issued at 1500 UTC TUE SEP 21 2021 000 WTNT21 KNHC 211452 TCMAT1 TROPICAL STORM PETER FORECAST/ADVISORY NUMBER 12 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 1500 UTC TUE SEP 21 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN THE NORTHERN LEEWARD ISLANDS...VIRGIN ISLANDS...AND PUERTO RICO SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 19.9N 64.7W AT 21/1500Z POSITION ACCURATE WITHIN 40 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT.......130NE 0SE 0SW 0NW. 12 FT SEAS..120NE 0SE 0SW 120NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 19.9N 64.7W AT 21/1500Z AT 21/1200Z CENTER WAS LOCATED NEAR 19.8N 64.0W FORECAST VALID 22/0000Z 20.7N 65.7W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 22/1200Z 21.7N 67.0W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 23/0000Z 22.7N 67.5W MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 23/1200Z 23.4N 67.6W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 24/0000Z 24.4N 67.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 24/1200Z 25.4N 66.2W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 25/1200Z 27.5N 64.4W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. OUTLOOK VALID 26/1200Z 29.8N 62.5W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 19.9N 64.7W NEXT ADVISORY AT 21/2100Z $$ FORECASTER PAPIN
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