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Tropical Depression Twenty-Seven Forecast Discussion Number 1
2020-10-19 14:05:33| National Hurricane Center (Atlantic)
Issued at 800 AM AST Mon Oct 19 2020 000 WTNT42 KNHC 191205 TCDAT2 Tropical Depression Twenty-Seven Special Discussion Number 1 NWS National Hurricane Center Miami FL AL272020 800 AM AST Mon Oct 19 2020 Deep convection associated with the area of low pressure over the central Atlantic has become significantly better organized overnight. The low-level center is located near the western edge of the convection, but the system has enough organization to be declared a tropical cyclone. Therefore, advisories are being initiated at this time. The system appears to be near tropical-storm strength, but since earlier classifications were just below that intensity the system is being started as a 30-kt tropical depression. The system appears more tropical than subtropical since it is no longer co-located with an upper-level low and it appears to have a fairly small radius of maximum winds. Therefore, it has been designated a tropical cyclone. Scatterometer data later this morning should provide a better assessment of the system's intensity. The depression is located over SSTs over 27-28 degrees Celsius and within an area of moderate westerly shear. These conditions should allow for gradual strengthening over the next day or so. After that time, the shear is expected to decrease and continued strengthen is anticipated. The NHC intensity forecasts calls for the system to become a hurricane within 72 hours, and is in best agreement with the HCCA and ICON intensity consensus models. The depression is located in an area of weak steering currents near the base of a mid- to upper-level trough that extends southwestward from the northeastern Atlantic. As a result, little net motion is expected through tonight. A mid- to upper-level ridge is forecast to build over the western and central Atlantic to the north of the system by midweek. As the ridge slides eastward later this week, the cyclone should move west-northwestward to northwestward at a faster rate of speed. This motion will bring the system close to Bermuda by late week and the interests on that island should closely monitor the progress of the cyclone. The dynamical models are in relatively good agreement on the overall scenario and the NHC track forecast is near the center of the guidance envelope. FORECAST POSITIONS AND MAX WINDS INIT 19/1200Z 25.8N 55.5W 30 KT 35 MPH 12H 19/1800Z 25.8N 55.4W 35 KT 40 MPH 24H 20/0600Z 26.0N 55.3W 45 KT 50 MPH 36H 20/1800Z 26.9N 55.9W 50 KT 60 MPH 48H 21/0600Z 28.0N 57.8W 55 KT 65 MPH 60H 21/1800Z 28.6N 59.3W 60 KT 70 MPH 72H 22/0600Z 29.5N 60.3W 65 KT 75 MPH 96H 23/0600Z 31.7N 62.3W 70 KT 80 MPH 120H 24/0600Z 33.5N 63.8W 75 KT 85 MPH $$ Forecaster Brown
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Tropical Depression Twenty-Seven Forecast Advisory Number 1
2020-10-19 13:53:29| National Hurricane Center (Atlantic)
Issued at 1200 UTC MON OCT 19 2020 410 WTNT22 KNHC 191153 TCMAT2 TROPICAL DEPRESSION TWENTY-SEVEN SPECIAL FORECAST/ADVISORY NUMBER 1 NWS NATIONAL HURRICANE CENTER MIAMI FL AL272020 1200 UTC MON OCT 19 2020 THERE ARE NO COASTAL WATCHES OR WARNING IN EFFECT. INTERESTS IN BERMUDA SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL DEPRESSION CENTER LOCATED NEAR 25.8N 55.5W AT 19/1200Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE NORTH OR 360 DEGREES AT 0 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1003 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 25.8N 55.5W AT 19/1200Z AT 19/0600Z CENTER WAS LOCATED NEAR 25.7N 55.6W FORECAST VALID 19/1800Z 25.8N 55.4W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 70NE 70SE 0SW 70NW. FORECAST VALID 20/0600Z 26.0N 55.3W MAX WIND 45 KT...GUSTS 55 KT. 34 KT...100NE 80SE 0SW 110NW. FORECAST VALID 20/1800Z 26.9N 55.9W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 0SE 0SW 40NW. 34 KT...120NE 80SE 40SW 160NW. FORECAST VALID 21/0600Z 28.0N 57.8W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 50NE 40SE 0SW 50NW. 34 KT...150NE 80SE 40SW 210NW. FORECAST VALID 21/1800Z 28.6N 59.3W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 60NE 40SE 0SW 60NW. 34 KT...210NE 90SE 60SW 210NW. FORECAST VALID 22/0600Z 29.5N 60.3W MAX WIND 65 KT...GUSTS 80 KT. 50 KT... 60NE 30SE 30SW 60NW. 34 KT...240NE 90SE 90SW 240NW. 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 31.7N 62.3W MAX WIND 70 KT...GUSTS 85 KT. OUTLOOK VALID 24/0600Z 33.5N 63.8W MAX WIND 75 KT...GUSTS 90 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.8N 55.5W NEXT ADVISORY AT 19/1500Z $$ FORECASTER BROWN
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Post-Tropical Cyclone Norbert Forecast Discussion Number 26
2020-10-15 10:31:56| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Thu Oct 15 2020 000 WTPZ44 KNHC 150831 TCDEP4 Post-Tropical Cyclone Norbert Discussion Number 26 NWS National Hurricane Center Miami FL EP192020 200 AM PDT Thu Oct 15 2020 Vertical wind shear, cool waters, and a dry and stable atmosphere have taken a toll on Norbert. The system has been devoid of deep convection for more than 12 hours, and therefore it has become a post-tropical cyclone. The initial wind speed is set at 25 kt, which is based on a TAFB Dvorak CI number of T1.5. This could be a little generous as the system has likely continued to spin down since the previous advisory. The remnant low should continue to weaken today, and the global models indicate that the low will open up into a trough of low pressure off the west coast of the Baja California peninsula by tonight. The post-tropical cyclone has slowed down and is now moving north-northwestward at about 6 kt. A slow north-northwestward motion within the weak low-level steering flow is expected until dissipation occurs. This is the last NHC advisory on Norbert. For additional information on the remnant low please see High Seas Forecasts issued by the National Weather Service, under AWIPS header NFDHSFEPI, WMO header FZPN02 KWBC, and on the web at ocean.weather.gov/shtml/NFDHSFEPI.php FORECAST POSITIONS AND MAX WINDS INIT 15/0900Z 26.2N 116.1W 25 KT 30 MPH...POST-TROPICAL 12H 15/1800Z 27.1N 116.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 24H 16/0600Z...DISSIPATED $$ Forecaster Brown
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Post-Tropical Cyclone Norbert Forecast Advisory Number 26
2020-10-15 10:30:55| National Hurricane Center (East Pacific)
Issued at 0900 UTC THU OCT 15 2020 000 WTPZ24 KNHC 150830 TCMEP4 POST-TROPICAL CYCLONE NORBERT FORECAST/ADVISORY NUMBER 26 NWS NATIONAL HURRICANE CENTER MIAMI FL EP192020 0900 UTC THU OCT 15 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. POST-TROPICAL CYCLONE CENTER LOCATED NEAR 26.2N 116.1W AT 15/0900Z POSITION ACCURATE WITHIN 45 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 335 DEGREES AT 6 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1010 MB MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 26.2N 116.1W AT 15/0900Z AT 15/0600Z CENTER WAS LOCATED NEAR 26.0N 115.9W FORECAST VALID 15/1800Z 27.1N 116.3W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 16/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.2N 116.1W THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON NORBERT. FOR ADDITIONAL INFORMATION ON THE REMNANT LOW PLEASE SEE HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFEPI AND WMO HEADER FZPN02 KWBC. $$ FORECASTER BROWN
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Tropical Depression Norbert Forecast Discussion Number 25
2020-10-15 04:37:52| National Hurricane Center (East Pacific)
Issued at 800 PM PDT Wed Oct 14 2020 000 WTPZ44 KNHC 150237 TCDEP4 Tropical Depression Norbert Discussion Number 25 NWS National Hurricane Center Miami FL EP192020 800 PM PDT Wed Oct 14 2020 There are a few convective cells located more than 60 n mi to the west-northwest of Norbert's center, but for the most part, organized deep convection ceased around the time of the previous advisory. Assuming a spin down of the circulation since the afternoon ASCAT pass, and based on lower satellite estimates, Norbert's estimated intensity is now 25 kt. Further weakening is expected due to cool waters and moderate-to-strong shear, and if deep convection does not return soon, Norbert will degenerate into a remnant low overnight. Global model fields indicate that the remnant low will open up into a trough and dissipate just off the west coast of the Baja California peninsula in about 24 hours. Norbert has slowed down a bit, now that its shallower circulation is not being influenced by the steering around a mid-level low to its southwest as much as it was earlier today. The current motion is toward the north-northwest (330/12 kt), and Norbert is expected to slow down further until the time it dissipates. The updated NHC track forecast lies on top of the TVCE and HCCA consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 25.7N 115.7W 25 KT 30 MPH 12H 15/1200Z 26.7N 116.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 24H 16/0000Z...DISSIPATED $$ Forecaster Berg
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