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Subtropical Storm Teresa Forecast Discussion Number 3
2021-09-25 10:34:59| National Hurricane Center (Atlantic)
Issued at 500 AM AST Sat Sep 25 2021 000 WTNT44 KNHC 250834 TCDAT4 Subtropical Storm Teresa Discussion Number 3 NWS National Hurricane Center Miami FL AL192021 500 AM AST Sat Sep 25 2021 Teresa is poorly organized and it likely won't be a subtropical cyclone for much longer. The cloud pattern consists of a swirl of low-level clouds and a band of showers and thunderstorms that is located more than 250 n mi northeast of the center. This patch of convection has been detaching from the low-level circulation and it appears to be more involved with an upper-level low to the east of Teresa. ASCAT-B and ASCAT-C caught the circulation several hours ago, and showed winds of 25-30 kt near it. However, that instrument did not sample the area of convection well northeast of the center, where the winds could be a little stronger. Given the degraded structure of the system, the initial intensity is lowered to a possibly generous 35 kt. Now that the upper-level low has pulled away from the subtropical storm, west-southwesterly shear is increasing across the circulation and that should prevent convective organization and any opportunity for strengthening. Due to the strong shear and dry air entrainment, Teresa is likely to become a remnant low later today or tonight and dissipate on Sunday. Teresa is moving slowly west-northwestward at 5 kt. A turn to the north is expected later today, followed by a northeast motion as the cyclone moves in the flow ahead of a deep-layer trough. FORECAST POSITIONS AND MAX WINDS INIT 25/0900Z 34.5N 65.5W 35 KT 40 MPH 12H 25/1800Z 35.4N 65.3W 30 KT 35 MPH 24H 26/0600Z 37.2N 64.6W 30 KT 35 MPH...POST-TROP/REMNT LOW 36H 26/1800Z...DISSIPATED $$ Forecaster Cangialosi
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Subtropical Storm Teresa Wind Speed Probabilities Number 3
2021-09-25 10:34:52| National Hurricane Center (Atlantic)
Issued at 0900 UTC SAT SEP 25 2021 000 FONT14 KNHC 250834 PWSAT4 SUBTROPICAL STORM TERESA WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL192021 0900 UTC SAT SEP 25 2021 AT 0900Z THE CENTER OF SUBTROPICAL STORM TERESA WAS LOCATED NEAR LATITUDE 34.5 NORTH...LONGITUDE 65.5 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 SAT 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 SAT 18Z SAT 06Z SUN 18Z SUN 06Z MON 06Z TUE 06Z WED PERIODS TO TO TO TO TO TO TO 18Z SAT 06Z SUN 18Z SUN 06Z MON 06Z TUE 06Z WED 06Z THU FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER CANGIALOSI
Subtropical Storm Teresa Graphics
2021-09-25 04:43:10| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Sat, 25 Sep 2021 02:43:10 GMT Wind Speed Probabilities last updated Sat, 25 Sep 2021 02:43:11 GMT
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Subtropical Storm Teresa Forecast Discussion Number 2
2021-09-25 04:42:19| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Fri Sep 24 2021 000 WTNT44 KNHC 250242 TCDAT4 Subtropical Storm Teresa Discussion Number 2 NWS National Hurricane Center Miami FL AL192021 1100 PM AST Fri Sep 24 2021 Teresa's cloud pattern is not well organized, even for a subtropical cyclone. The main convective band is rather ragged in appearance, and situated 100 n mi or more to the east and northeast of the exposed low-level center. The current intensity estimate, 40 kt, is in general agreement with the latest subtropical satellite classification from TAFB, but given the disheveled appearance of the system, this may be generous. Teresa has recently been moving more westward than northward, on the northern side of a mid-level cyclonic circulation, and the current motion estimate is an uncertain 300/9 kt. During the next day or so, the cyclone is likely to turn northward and northeastward ahead of a mid-tropospheric trough that will be moving over the northeastern United States and Atlantic Canada. The official forecast is a little faster than the previous one, but along the same general trajectory. The HCCA model consensus is somewhat faster than the NHC prediction. The cyclone has been situated under an upper-level low which has kept the vertical shear fairly low thus far. However, as this low moves away from the area, Teresa will begin to experience increasing west-southwesterly shear, and no strengthening is expected. In 48 hours or so, based on the global models, the storm is forecast to become absorbed by the aforementioned trough. FORECAST POSITIONS AND MAX WINDS INIT 25/0300Z 34.3N 65.4W 40 KT 45 MPH 12H 25/1200Z 35.2N 65.5W 40 KT 45 MPH 24H 26/0000Z 36.2N 64.9W 40 KT 45 MPH 36H 26/1200Z 37.8N 64.0W 40 KT 45 MPH 48H 27/0000Z...ABSORBED $$ Forecaster Pasch
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Summary for Subtropical Storm Teresa (AT4/AL192021)
2021-09-25 04:41:52| National Hurricane Center (Atlantic)
...TERESA LIKELY TO BE SHORT-LIVED... As of 11:00 PM AST Fri Sep 24 the center of Teresa was located near 34.3, -65.4 with movement WNW at 10 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 45 mph.
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