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Tropical Storm Marie Forecast Advisory Number 5

2020-09-30 10:36:33| National Hurricane Center (East Pacific)

Issued at 0900 UTC WED SEP 30 2020 042 WTPZ23 KNHC 300836 TCMEP3 TROPICAL STORM MARIE FORECAST/ADVISORY NUMBER 5 NWS NATIONAL HURRICANE CENTER MIAMI FL EP182020 0900 UTC WED SEP 30 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 14.1N 112.5W AT 30/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 280 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1000 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 15NE 0SE 0SW 0NW. 34 KT....... 40NE 40SE 20SW 40NW. 12 FT SEAS.. 30NE 180SE 210SW 30NW. 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 14.1N 112.5W AT 30/0900Z AT 30/0600Z CENTER WAS LOCATED NEAR 14.0N 111.7W FORECAST VALID 30/1800Z 14.4N 114.8W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 40NE 40SE 30SW 40NW. FORECAST VALID 01/0600Z 14.5N 117.7W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 15NE 15SE 0SW 15NW. 50 KT... 30NE 30SE 20SW 30NW. 34 KT... 70NE 60SE 50SW 70NW. FORECAST VALID 01/1800Z 14.9N 120.5W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 20NE 20SE 15SW 20NW. 50 KT... 40NE 40SE 30SW 40NW. 34 KT...100NE 90SE 80SW 90NW. FORECAST VALID 02/0600Z 15.7N 123.1W MAX WIND 105 KT...GUSTS 130 KT. 64 KT... 30NE 30SE 20SW 25NW. 50 KT... 60NE 60SE 40SW 50NW. 34 KT...120NE 110SE 80SW 100NW. FORECAST VALID 02/1800Z 16.8N 125.3W MAX WIND 110 KT...GUSTS 135 KT. 50 KT... 70NE 70SE 50SW 60NW. 34 KT...120NE 110SE 90SW 110NW. FORECAST VALID 03/0600Z 18.0N 127.2W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 80NE 70SE 50SW 70NW. 34 KT...130NE 110SE 90SW 110NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 04/0600Z 20.0N 130.2W MAX WIND 75 KT...GUSTS 90 KT. OUTLOOK VALID 05/0600Z 21.5N 133.0W MAX WIND 55 KT...GUSTS 65 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 14.1N 112.5W NEXT ADVISORY AT 30/1500Z $$ FORECASTER BROWN

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Tropical Storm Marie Forecast Discussion Number 4

2020-09-30 04:35:27| National Hurricane Center (East Pacific)

Issued at 900 PM MDT Tue Sep 29 2020 000 WTPZ43 KNHC 300235 TCDEP3 Tropical Storm Marie Discussion Number 4 NWS National Hurricane Center Miami FL EP182020 900 PM MDT Tue Sep 29 2020 Infrared and passive microwave imagery indicate that Marie has continued to become better organized despite moderate northeasterly vertical wind shear of about 15 kt. The deep convection is now primarily confined to a single tightly curved band that wraps around the west side of the circulation. A late-arriving 29/1718Z ASCAT-C scatterometer pass revealed that Marie has a very tight inner-core circulation with a radius of maximum winds (RMW) of only 10-15 nmi and a small 34-kt wind radii extending outward to only about 20 nmi The scatterometer data also showed some 34-38 kt surface wind vectors in all quadrants. A blend of the scatterometer wind data and subjective Dvorak intensity estimates of of T2.5/35 kt and T3.0/45 kt from SAB and TAFB, respectively, the intensity has been increased to 40 kt. The initial motion estimate is 275/11 kt. As mentioned in the previous discussion, Marie's forecast track remains fairly straightforward. The cyclone is expected to move generally westward to west-northwestward for the next few days as it skirts the southern periphery of a deep-layer ridge to the north. Thereafter, a slower motion toward the northwest is forecast as Marie moves into a weakness in the ridge. The new NHC track forecast is similar to but a little to the left of the previous advisory track, and lies down the middle of the tightly packed consensus track model guidance envelope. Although the GFS- and ECMWF-based SHIPS intensity models have backed off significantly on predicting rapid intensification (RI) on this cycle, several environmental and cyclone structural parameters are still favorable for RI to occur. For about the next 72 hours, sea-surface temperatures (SST) are forecast to remain above 28C, alone with mid-level humidity values above 70 prevent and low wind shear values around 5 kt. Those environmental conditions coupled with Marie's small RMW should result in RI beginning in about 24 hours and continuing until the 60-h time period. As result, Marie is forecast to strengthen into a hurricane in about 24 hours and possibly become a major hurricane in 60-72 hours. Rapid weakening is expected on days 4 and 5 due to SSTs less than 26C, likely significant cold upwelling owing to Marie's expected large and strong wind field, and increasing southwesterly vertical shear of 20-25 kt. The NHC official intensity forecast is similar to the previous advisory, and closely follows a blend of the Decay-SHIPS and LGEM statistical models and the corrected-consensus HCCA model. Marie's 12-ft sea radii remain larger than would be expected for a small tropical storm due to a large fetch of southerly swell originating from the Southern Hemisphere. FORECAST POSITIONS AND MAX WINDS INIT 30/0300Z 13.8N 110.4W 40 KT 45 MPH 12H 30/1200Z 14.1N 112.9W 50 KT 60 MPH 24H 01/0000Z 14.6N 115.9W 60 KT 70 MPH 36H 01/1200Z 15.0N 118.8W 75 KT 85 MPH 48H 02/0000Z 15.5N 121.4W 90 KT 105 MPH 60H 02/1200Z 16.5N 123.8W 105 KT 120 MPH 72H 03/0000Z 17.6N 125.9W 100 KT 115 MPH 96H 04/0000Z 19.8N 129.3W 80 KT 90 MPH 120H 05/0000Z 21.4N 132.1W 60 KT 70 MPH $$ Forecaster Stewart

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Tropical Storm Marie Forecast Advisory Number 4

2020-09-30 04:32:33| National Hurricane Center (East Pacific)

Issued at 0300 UTC WED SEP 30 2020 000 WTPZ23 KNHC 300232 TCMEP3 TROPICAL STORM MARIE FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL EP182020 0300 UTC WED SEP 30 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 13.8N 110.4W AT 30/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1003 MB MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT. 34 KT....... 20NE 20SE 20SW 20NW. 12 FT SEAS.. 0NE 120SE 240SW 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 13.8N 110.4W AT 30/0300Z AT 30/0000Z CENTER WAS LOCATED NEAR 13.7N 110.0W FORECAST VALID 30/1200Z 14.1N 112.9W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 15NE 0SE 0SW 15NW. 34 KT... 30NE 30SE 30SW 30NW. FORECAST VALID 01/0000Z 14.6N 115.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 60NE 60SE 50SW 60NW. FORECAST VALID 01/1200Z 15.0N 118.8W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 20SE 15SW 20NW. 50 KT... 40NE 40SE 30SW 40NW. 34 KT... 90NE 80SE 70SW 80NW. FORECAST VALID 02/0000Z 15.5N 121.4W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 30NE 30SE 20SW 25NW. 50 KT... 60NE 60SE 40SW 50NW. 34 KT...110NE 100SE 80SW 90NW. FORECAST VALID 02/1200Z 16.5N 123.8W MAX WIND 105 KT...GUSTS 130 KT. 50 KT... 70NE 70SE 50SW 60NW. 34 KT...120NE 110SE 90SW 110NW. FORECAST VALID 03/0000Z 17.6N 125.9W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 80NE 70SE 50SW 70NW. 34 KT...130NE 110SE 90SW 110NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 04/0000Z 19.8N 129.3W MAX WIND 80 KT...GUSTS 100 KT. OUTLOOK VALID 05/0000Z 21.4N 132.1W MAX WIND 60 KT...GUSTS 75 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.8N 110.4W NEXT ADVISORY AT 30/0900Z $$ FORECASTER STEWART

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Tropical Storm Marie Forecast Discussion Number 3

2020-09-29 22:33:58| National Hurricane Center (East Pacific)

Issued at 300 PM MDT Tue Sep 29 2020 000 WTPZ43 KNHC 292033 TCDEP3 Tropical Storm Marie Discussion Number 3 NWS National Hurricane Center Miami FL EP182020 300 PM MDT Tue Sep 29 2020 A WindSat microwave image from earlier this morning indicated that the tropical cyclone's low-level circulation was becoming better defined, with perhaps the formative stage of a cyan ring seen in the 37-GHz channel. Visible images also show the center tucked just beneath recent bursts of deep convection, and Dvorak estimates have risen to T2.0 and T2.5 from TAFB and SAB, respectively. These data, along with ambiguity analyses of recent ASCAT-B and -C scatterometer passes, indicate the depression has strengthened to Tropical Storm Marie with maximum winds of 35 kt. Marie's future track is probably the most straightforward part of the forecast. A mid-tropospheric high anchored over the southwestern United States is steering Marie westward with an initial motion of 275/10 kt. This high will remain the main driver, forcing the cyclone westward or west-northwestward for the next 3 days. By days 4 and 5, Marie is likely to reach a break in the ridge and should slow down a bit and turn toward the northwest. There are no notable outliers among the track guidance, and the small spread among the models yields higher-than-normal confidence in the track forecast. The new NHC forecast is very similar to the previous prediction, and is close to the TVCE and HCCA consensus aids. The intensity forecast is a little more challenging, but mostly because a good proportion of the guidance suggests that Marie will intensify significantly during the next few days. Relatively low deep-layer shear, warm ocean waters, and favorable upper-level divergence all favor strengthening, and several of the various SHIPS Rapid Intensification thresholds are several times higher than their climatological means. In addition, all of the dynamical models, the consensus aids, and the GFS-based SHIPS model bring Marie to hurricane strength within 24 hours. Given these signals, the NHC intensity forecast has been raised from the previous one and lies near or just below the intensity consensus in order to maintain some continuity. But given what is shown by some of the better-performing intensity models, I would not be surprised if subsequent forecasts show a faster rate of intensification or a higher peak intensity. Weakening is expected by days 4 and 5 due to cooler waters and increasing southwesterly shear. Marie's 12-ft sea radii are larger than would be expected for a small, just-developing tropical storm due to a large fetch of southerly swell originating from the Southern Hemisphere. FORECAST POSITIONS AND MAX WINDS INIT 29/2100Z 13.6N 109.5W 35 KT 40 MPH 12H 30/0600Z 13.9N 111.6W 45 KT 50 MPH 24H 30/1800Z 14.6N 114.5W 60 KT 70 MPH 36H 01/0600Z 14.9N 117.5W 75 KT 85 MPH 48H 01/1800Z 15.3N 120.3W 90 KT 105 MPH 60H 02/0600Z 16.0N 122.7W 100 KT 115 MPH 72H 02/1800Z 17.2N 124.9W 100 KT 115 MPH 96H 03/1800Z 19.6N 128.5W 85 KT 100 MPH 120H 04/1800Z 21.4N 131.6W 60 KT 70 MPH $$ Forecaster Berg

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Tropical Storm Marie Forecast Advisory Number 3

2020-09-29 22:33:02| National Hurricane Center (East Pacific)

Issued at 2100 UTC TUE SEP 29 2020 000 WTPZ23 KNHC 292032 TCMEP3 TROPICAL STORM MARIE FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL EP182020 2100 UTC TUE SEP 29 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 13.6N 109.5W AT 29/2100Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 20NE 20SE 0SW 20NW. 12 FT SEAS.. 0NE 120SE 240SW 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 13.6N 109.5W AT 29/2100Z AT 29/1800Z CENTER WAS LOCATED NEAR 13.6N 108.8W FORECAST VALID 30/0600Z 13.9N 111.6W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 40NE 40SE 30SW 40NW. FORECAST VALID 30/1800Z 14.6N 114.5W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 60NE 70SE 60SW 70NW. FORECAST VALID 01/0600Z 14.9N 117.5W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 20SE 0SW 20NW. 50 KT... 40NE 40SE 30SW 40NW. 34 KT... 90NE 80SE 70SW 80NW. FORECAST VALID 01/1800Z 15.3N 120.3W MAX WIND 90 KT...GUSTS 110 KT. 64 KT... 30NE 30SE 20SW 25NW. 50 KT... 60NE 60SE 40SW 50NW. 34 KT...110NE 100SE 80SW 90NW. FORECAST VALID 02/0600Z 16.0N 122.7W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 70NE 70SE 50SW 60NW. 34 KT...120NE 110SE 90SW 110NW. FORECAST VALID 02/1800Z 17.2N 124.9W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 80NE 70SE 50SW 70NW. 34 KT...130NE 110SE 90SW 110NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 100 NM ON DAY 4 AND 150 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 03/1800Z 19.6N 128.5W MAX WIND 85 KT...GUSTS 105 KT. OUTLOOK VALID 04/1800Z 21.4N 131.6W MAX WIND 60 KT...GUSTS 75 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.6N 109.5W NEXT ADVISORY AT 30/0300Z $$ FORECASTER BERG

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