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Tropical Storm Teddy Forecast Discussion Number 10
2020-09-15 04:33:47| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Mon Sep 14 2020 000 WTNT45 KNHC 150233 TCDAT5 Tropical Storm Teddy Discussion Number 10 NWS National Hurricane Center Miami FL AL202020 1100 PM AST Mon Sep 14 2020 Teddy is displaying some mixed signals this evening. On one hand, satellite imagery shows an improving cloud pattern, with increasing central convection and a large curved band on the southern side of the circulation. The latest TAFB/SAB Dvorak estimates have increased to 55 kt on this basis. Scatterometer data, surprisingly, only shows 35-40 kt. The initial wind speed remains 45 kt as a blend of that data, assuming the typical undersampling from ASCAT, but there is a fair bit of uncertainty in the current wind speed. Teddy should have several days in a low or moderate shear environment over warm waters to intensify. All guidance responds to this forcing by showing Teddy near major hurricane strength in a few days, with the biggest disagreement being how fast it gets there. The new forecast is similar to the previous one, leaning toward the NOAA corrected-consensus guidance HCCA. Teddy is moving about the same as before, or 280/11 kt. No substantial changes were made to the forecast track with the storm in a seemingly stable steering current provided by a deep-layer ridge over the central Atlantic. Teddy should turn west-northwestward overnight and then northwestward on Wednesday through the end of the forecast while it moves on the southwestern flank of the ridge. Model guidance is in excellent agreement, with only some minor speed differences. The NHC track prediction is basically on top of the previous one and the consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 13.2N 45.0W 45 KT 50 MPH 12H 15/1200Z 13.8N 46.5W 55 KT 65 MPH 24H 16/0000Z 14.8N 48.3W 70 KT 80 MPH 36H 16/1200Z 15.9N 49.8W 80 KT 90 MPH 48H 17/0000Z 17.3N 51.3W 90 KT 105 MPH 60H 17/1200Z 18.5N 52.6W 95 KT 110 MPH 72H 18/0000Z 19.9N 54.2W 105 KT 120 MPH 96H 19/0000Z 22.6N 56.9W 105 KT 120 MPH 120H 20/0000Z 25.5N 60.0W 105 KT 120 MPH $$ Forecaster Blake
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Tropical Storm Teddy Wind Speed Probabilities Number 10
2020-09-15 04:32:49| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE SEP 15 2020 000 FONT15 KNHC 150232 PWSAT5 TROPICAL STORM TEDDY WIND SPEED PROBABILITIES NUMBER 10 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202020 0300 UTC TUE SEP 15 2020 AT 0300Z THE CENTER OF TROPICAL STORM TEDDY WAS LOCATED NEAR LATITUDE 13.2 NORTH...LONGITUDE 45.0 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 00Z TUE AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 00Z TUE 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT PERIODS TO TO TO TO TO TO TO 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT 00Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER BLAKE
Tropical Storm Teddy Forecast Advisory Number 10
2020-09-15 04:32:19| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE SEP 15 2020 000 WTNT25 KNHC 150232 TCMAT5 TROPICAL STORM TEDDY FORECAST/ADVISORY NUMBER 10 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202020 0300 UTC TUE SEP 15 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 13.2N 45.0W AT 15/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT. 34 KT.......100NE 50SE 0SW 80NW. 12 FT SEAS..300NE 210SE 30SW 0NW. 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 13.2N 45.0W AT 15/0300Z AT 15/0000Z CENTER WAS LOCATED NEAR 13.0N 44.5W FORECAST VALID 15/1200Z 13.8N 46.5W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 0SE 0SW 20NW. 34 KT...120NE 70SE 40SW 100NW. FORECAST VALID 16/0000Z 14.8N 48.3W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 10SE 0SW 20NW. 50 KT... 60NE 30SE 20SW 50NW. 34 KT...130NE 100SE 70SW 120NW. FORECAST VALID 16/1200Z 15.9N 49.8W MAX WIND 80 KT...GUSTS 100 KT. 64 KT... 30NE 20SE 10SW 30NW. 50 KT... 70NE 50SE 40SW 60NW. 34 KT...150NE 130SE 80SW 130NW. FORECAST VALID 17/0000Z 17.3N 51.3W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 40NE 30SE 20SW 40NW. 50 KT... 80NE 50SE 50SW 70NW. 34 KT...150NE 130SE 90SW 130NW. FORECAST VALID 17/1200Z 18.5N 52.6W MAX WIND 95 KT...GUSTS 115 KT. 50 KT... 80NE 50SE 50SW 70NW. 34 KT...150NE 130SE 90SW 130NW. FORECAST VALID 18/0000Z 19.9N 54.2W MAX WIND 105 KT...GUSTS 130 KT. 50 KT... 90NE 80SE 60SW 80NW. 34 KT...160NE 140SE 100SW 150NW. 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 19/0000Z 22.6N 56.9W MAX WIND 105 KT...GUSTS 130 KT. OUTLOOK VALID 20/0000Z 25.5N 60.0W MAX WIND 105 KT...GUSTS 130 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.2N 45.0W NEXT ADVISORY AT 15/0900Z $$ FORECASTER BLAKE
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Summary for Tropical Storm Teddy (AT5/AL202020)
2020-09-15 04:32:18| National Hurricane Center (Atlantic)
...TEDDY FORECAST TO BECOME A HURRICANE ON TUESDAY... As of 11:00 PM AST Mon Sep 14 the center of Teddy was located near 13.2, -45.0 with movement W at 13 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 50 mph.
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Tropical Storm Teddy Public Advisory Number 10
2020-09-15 04:32:18| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Mon Sep 14 2020 000 WTNT35 KNHC 150232 TCPAT5 BULLETIN Tropical Storm Teddy Advisory Number 10 NWS National Hurricane Center Miami FL AL202020 1100 PM AST Mon Sep 14 2020 ...TEDDY FORECAST TO BECOME A HURRICANE ON TUESDAY... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...13.2N 45.0W ABOUT 1100 MI...1770 KM E OF THE LESSER ANTILLES MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 13 MPH...20 KM/H MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM AST (0300 UTC), the center of Tropical Storm Teddy was located near latitude 13.2 North, longitude 45.0 West. Teddy is moving toward the west near 13 mph (20 km/h). A west-northwestward motion at a slower forward speed is expected overnight through Tuesday night, followed by a northwestward motion Wednesday and Thursday. Maximum sustained winds remain near 50 mph (85 km/h) with higher gusts. Strengthening is forecast for the next several days. Teddy is expected to become a hurricane Tuesday and could reach major hurricane strength on Thursday. Tropical-storm-force winds extend outward up to 115 miles (185 km) from the center. The estimated minimum central pressure is 1002 mb (29.59 inches). HAZARDS AFFECTING LAND ---------------------- SURF: Large swells generated by Tropical Storm Teddy are expected to reach the Lesser Antilles and the northeastern coast of South America on Wednesday. These swells are likely to cause life- threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Blake
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