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Tropical Storm Victor Forecast Discussion Number 6
2021-09-30 22:43:09| National Hurricane Center (Atlantic)
Issued at 500 PM AST Thu Sep 30 2021 000 WTNT45 KNHC 302042 TCDAT5 Tropical Storm Victor Discussion Number 6 NWS National Hurricane Center Miami FL AL202021 500 PM AST Thu Sep 30 2021 Victor has been relatively steady in strength during the past several hours. Satellite images continue to show that the storm has a large circulation with numerous curved bands surrounding the center. However, recent microwave images indicate that the cyclone has yet to develop a well-defined inner core, which is likely why the system has not strengthened much despite the favorable environmental conditions. The Dvorak classifications are again unchanged and range from 35 to 45 kt, and on this basis, the initial intensity is held at 40 kt. Victor is still moving west-northwestward, or 290 degrees, at 12 kt. The storm is forecast to continue on that same general track for about another day as it remains on the south side of a deep-layer ridge over the subtropical eastern Atlantic. By late Friday, a mid- to upper-level low is expected to form over the central Atlantic, and that feature should erode the western portion of the ridge. As a result, Victor is expected to turn northwestward by the weekend and then northward by early next week when it is forecast to move in the flow between the ridge and the low. The GFS has shifted westward this cycle and is now not far from the ECMWF track. The new NHC forecast track is nudged westward toward a consensus of the GFS, ECMWF, UKMET, and HMON models. The standard consensus aids could be too far to the east since the latest run of the HWRF, which is a member of those models, is a significant outlier to the east. As mentioned above, although the storm has been in favorable conditions for strengthening during the past day or so, it has not taken full advantage likely due to its broad structure. The favorable environment for Victor should persist for about another 24 hours, so gradual strengthening is possible during that time period. However, by the weekend, the models show Victor moving into a region of moderate to strong southwesterly shear and a progressively drier airmass. These negative factors for the storm along with slightly cooler SSTs should cause Victor to lose strength this weekend and early next week. In fact, some of the models suggest that Victor could dissipate by the end of the forecast period. The new NHC intensity forecast is again a little lower than the previous one, trending toward the HCCA, IVCN, and IVDR consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 30/2100Z 9.9N 30.0W 40 KT 45 MPH 12H 01/0600Z 10.6N 31.4W 45 KT 50 MPH 24H 01/1800Z 11.6N 33.1W 55 KT 65 MPH 36H 02/0600Z 12.9N 34.6W 50 KT 60 MPH 48H 02/1800Z 14.5N 36.2W 45 KT 50 MPH 60H 03/0600Z 16.4N 38.0W 40 KT 45 MPH 72H 03/1800Z 18.9N 40.0W 35 KT 40 MPH 96H 04/1800Z 23.6N 42.7W 30 KT 35 MPH 120H 05/1800Z 28.0N 42.9W 30 KT 35 MPH $$ Forecaster Cangialosi
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Tropical Storm Victor Graphics
2021-09-30 22:38:08| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Thu, 30 Sep 2021 20:38:08 GMT Wind Speed Probabilities last updated Thu, 30 Sep 2021 21:28:55 GMT
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Summary for Tropical Storm Victor (AT5/AL202021)
2021-09-30 22:37:06| National Hurricane Center (Atlantic)
...VICTOR HOLDING STEADY IN STRENGTH OVER THE TROPICAL EAST ATLANTIC... As of 5:00 PM AST Thu Sep 30 the center of Victor was located near 9.9, -30.0 with movement WNW at 14 mph. The minimum central pressure was 1003 mb with maximum sustained winds of about 45 mph.
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Tropical Storm Victor Public Advisory Number 6
2021-09-30 22:37:06| National Hurricane Center (Atlantic)
Issued at 500 PM AST Thu Sep 30 2021 000 WTNT35 KNHC 302036 TCPAT5 BULLETIN Tropical Storm Victor Advisory Number 6 NWS National Hurricane Center Miami FL AL202021 500 PM AST Thu Sep 30 2021 ...VICTOR HOLDING STEADY IN STRENGTH OVER THE TROPICAL EAST ATLANTIC... SUMMARY OF 500 PM AST...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...9.9N 30.0W ABOUT 585 MI...940 KM SW OF THE CABO VERDE ISLANDS MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 500 PM AST (2100 UTC), the center of Tropical Storm Victor was located near latitude 9.9 North, longitude 30.0 West. Victor is moving toward the west-northwest near 14 mph (22 km/h). A west-northwest to northwest motion over the eastern tropical Atlantic is expected through the weekend. Maximum sustained winds remain near 45 mph (75 km/h) with higher gusts. Gradual strengthening is forecast during the next day or so. However, a weakening trend is expected to begin over the weekend. Tropical-storm-force winds extend outward up to 105 miles (165 km) from the center. The estimated minimum central pressure is 1003 mb (29.62 inches). HAZARDS AFFECTING LAND ---------------------- None NEXT ADVISORY ------------- Next complete advisory at 1100 PM AST. $$ Forecaster Cangialosi
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Tropical Storm Victor Wind Speed Probabilities Number 6
2021-09-30 22:37:06| National Hurricane Center (Atlantic)
Issued at 2100 UTC THU SEP 30 2021 000 FONT15 KNHC 302036 PWSAT5 TROPICAL STORM VICTOR WIND SPEED PROBABILITIES NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL202021 2100 UTC THU SEP 30 2021 AT 2100Z THE CENTER OF TROPICAL STORM VICTOR WAS LOCATED NEAR LATITUDE 9.9 NORTH...LONGITUDE 30.0 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 40 KTS...45 MPH...75 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 18Z THU 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 18Z THU 06Z FRI 18Z FRI 06Z SAT 18Z SAT 18Z SUN 18Z MON PERIODS TO TO TO TO TO TO TO 06Z FRI 18Z FRI 06Z SAT 18Z SAT 18Z SUN 18Z MON 18Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER CANGIALOSI
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