NHC Atlantic

Atlantic Tropical Weather Outlook

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 05:26:15 GMT

000
ABNT20 KNHC 190526
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 AM EDT Sun Sep 19 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories on newly formed
Tropical Depression Sixteen, located a several hundred miles east of
the northern Leeward Island.

Recent satellite-derived wind data indicate that the small low
pressure system located over the far eastern tropical Atlantic a few
hundred miles south-southwest of the Cabo Verde Islands has become
better defined. Associated thunderstorm activity has also become
more concentrated near the center, and environmental conditions are
conducive for a tropical depression to form later this morning while
the low moves generally northwestward at 10 to 15 mph, well to the
west of the Cabo Verde Islands.
* Formation chance through 48 hours...high...90 percent.
* Formation chance through 5 days...high...90 percent.

&&

Public Advisories on Tropical Depression Sixteen are issued under
WMO header WTNT31 KNHC and under AWIPS header MIATCPAT1.
Forecast/Advisories on Tropical Depression Sixteen are issued under
WMO header WTNT21 KNHC and under AWIPS header MIATCMAT1.

$$
Forecaster Stewart

Summary for Tropical Storm Peter (AT1/AL162021)

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 08:35:03 GMT

...DEPRESSION BECOMES THE SIXTEENTH NAMED STORM OF THE SEASON OVER THE OPEN ATLANTIC... As of 5:00 AM AST Sun Sep 19 the center of Peter was located near 18.0, -53.5 with movement NW at 15 mph. The minimum central pressure was 1005 mb with maximum sustained winds of about 40 mph.

Tropical Storm Peter Public Advisory Number 2

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 08:35:03 GMT

Issued at 500 AM AST Sun Sep 19 2021 ZCZC MIATCPAT1 ALL TTAA00 KNHC DDHHMM BULLETIN Tropical Storm Peter Advisory Number 2 NWS National Hurricane Center Miami FL AL162021 500 AM AST Sun Sep 19 2021 ...DEPRESSION BECOMES THE SIXTEENTH NAMED STORM OF THE SEASON OVER THE OPEN ATLANTIC... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...18.0N 53.5W ABOUT 630 MI...1015 KM E OF THE NORTHERN LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1005 MB...29.68 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 500 AM AST (0900 UTC), the center of Tropical Storm Peter was located near latitude 18.0 North, longitude 53.5 West. Peter is moving toward the northwest near 15 mph (24 km/h), and this general motion is expected to continue this morning. A turn back toward the west-northwest is forecast to occur by this afternoon, with that motion continuing into Wednesday. On the forecast track, Peter is expected to pass well to the north of the northern Leeward Islands on Monday and Tuesday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Some additional strengthening is forecast during the next day or so, followed by a slow weakening trend by late Monday and on Tuesday. Tropical-storm-force winds extend outward up to 45 miles (75 km) from the center, mainly to the northeast and southeast of the center. The estimated minimum central pressure is 1005 mb (29.68 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: The outer bands south of the Tropical Storm Peter could produce rainfall totals of 1 to 2 inches across portions of the Northern Leeward Islands, including the Virgin Islands, as well as Puerto Rico late Sunday into Tuesday. This rainfall may lead to areas of urban and small stream flooding. SURF: Swells generated by Tropical Storm Peter are expected to reach the northern Leeward Islands Sunday night and Monday. 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 1100 AM AST. $$ Forecaster Stewart NNNN ]]>

Tropical Storm Peter Forecast Advisory Number 2

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 08:35:20 GMT

Issued at 0900 UTC SUN SEP 19 2021 000 WTNT21 KNHC 190835 TCMAT1 TROPICAL STORM PETER FORECAST/ADVISORY NUMBER 2 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 0900 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 18.0N 53.5W AT 19/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 40NE 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 18.0N 53.5W AT 19/0900Z AT 19/0600Z CENTER WAS LOCATED NEAR 17.6N 52.9W FORECAST VALID 19/1800Z 18.8N 55.3W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 50NE 0SE 0SW 40NW. FORECAST VALID 20/0600Z 19.8N 57.8W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 60NE 40SE 0SW 50NW. FORECAST VALID 20/1800Z 20.8N 60.1W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 80NE 50SE 0SW 50NW. FORECAST VALID 21/0600Z 21.7N 62.2W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 90NE 50SE 0SW 50NW. FORECAST VALID 21/1800Z 22.7N 63.9W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 80NE 40SE 0SW 0NW. FORECAST VALID 22/0600Z 23.7N 64.9W 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 18.0N 53.5W NEXT ADVISORY AT 19/1500Z $$ FORECASTER STEWART ]]>

Tropical Storm Peter Forecast Discussion Number 1

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 02:31:48 GMT

Issued at 1100 PM AST Sat Sep 18 2021 000 WTNT41 KNHC 190231 TCDAT1 Tropical Depression Sixteen Discussion Number 1 NWS National Hurricane Center Miami FL AL162021 1100 PM AST Sat Sep 18 2021 Satellite images and surface observations indicate that the area of low pressure that NHC has been monitoring to the east of the northern Leeward Islands now has a well-defined center and sufficiently organized deep convection to be classified a tropical depression. The depression has a small area of deep convection near its center and curved bands on its north and east sides. The initial intensity is estimated to be 30 kt, but this is a little below the latest Dvorak classifications and could be conservative. The depression is moving west-northwestward at 12 kt. The cyclone should continue west-northwestward at about the same pace during the next few days as it moves in the flow on the southwest side of a mid-level ridge. After that time, the ridge is expected to break down and the steering currents are forecast to become weak. Not surprisingly, the spread in the models increases around that time, but most of the solutions show a slow turn toward the north toward broad troughing associated with Post-Tropical Cyclone Odette. The GFS is on the southern side of the guidance envelope and the ECMWF on the northern side. The NHC track forecast lies between those models near the consensus aids. Some strengthening seems possible during the next 12 to 24 hours and the system is expected to become a tropical storm during that time frame. However, an increase in southerly and then southwesterly vertical wind shear should cause the system to level off in strength from 24 hours through the end of the forecast period. The models are in fairly good agreement on this overall scenario, and the NHC intensity forecast is in line with the majority of the guidance. 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. FORECAST POSITIONS AND MAX WINDS INIT 19/0300Z 16.4N 53.1W 30 KT 35 MPH 12H 19/1200Z 17.3N 54.8W 35 KT 40 MPH 24H 20/0000Z 18.5N 57.3W 40 KT 45 MPH 36H 20/1200Z 19.4N 59.8W 40 KT 45 MPH 48H 21/0000Z 20.3N 61.9W 35 KT 40 MPH 60H 21/1200Z 21.3N 64.1W 35 KT 40 MPH 72H 22/0000Z 22.3N 65.5W 35 KT 40 MPH 96H 23/0000Z 24.4N 66.5W 35 KT 40 MPH 120H 24/0000Z 26.3N 66.2W 35 KT 40 MPH $$ Forecaster Cangialosi ]]>

Tropical Storm Peter Wind Speed Probabilities Number 2

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 08:35:11 GMT

Issued at 0900 UTC SUN SEP 19 2021 ZCZC MIAPWSAT1 ALL TTAA00 KNHC DDHHMM TROPICAL STORM PETER WIND SPEED PROBABILITIES NUMBER 2 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162021 0900 UTC SUN SEP 19 2021 AT 0900Z THE CENTER OF TROPICAL STORM PETER WAS LOCATED NEAR LATITUDE 18.0 NORTH...LONGITUDE 53.5 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 06Z SUN 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 06Z SUN 18Z SUN 06Z MON 18Z MON 06Z TUE 06Z WED 06Z THU PERIODS TO TO TO TO TO TO TO 18Z SUN 06Z MON 18Z MON 06Z TUE 06Z WED 06Z THU 06Z FRI FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT BERMUDA 34 X X( X) X( X) X( X) X( X) X( X) 3( 3) $$ FORECASTER STEWART NNNN ]]>

Tropical Storm Peter Graphics

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 02:32:20 GMT

5-Day Uncertainty Track last updated Sun, 19 Sep 2021 02:32:20 GMT

Wind Speed Probabilities last updated Sun, 19 Sep 2021 03:22:36 GMT

Tropical Depression Seventeen Forecast Advisory Number 1

nhcwebmaster@noaa.gov (NHC Webmaster) — Sun, 19 Sep 2021 08:35:31 GMT

Issued at 0900 UTC SUN SEP 19 2021 ZCZC MIATCMAT2 ALL TTAA00 KNHC DDHHMM 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 NNNN ]]>