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Hurricane Epsilon Forecast Discussion Number 13
2020-10-22 04:41:22| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Wed Oct 21 2020 000 WTNT42 KNHC 220241 TCDAT2 Hurricane Epsilon Discussion Number 13 NWS National Hurricane Center Miami FL AL272020 1100 PM AST Wed Oct 21 2020 The eye of the hurricane remains well-defined this evening, although the surrounding cloud tops are beginning to warm a bit. An Air Force Hurricane Hunter aircraft investigated Epsilon a little while ago and found peak 700 mb flight level winds of 110 kt, which continues to support an intensity of 100 kt. The central pressure had fallen slightly since this afternoon, but recent center fixes suggest that it is leveling off. Some fluctuations in intensity are possible over the next 12 hours or so due to inner-core processes. Later on Thursday, a slow weakening trend is expected to begin as vertical shear over Epsilon should gradually increase. The official intensity forecast is in good agreement with the latest model consensus. By 96 hours, the global models indicate that the strong cyclone will merge with a frontal zone over the mid-latitudes, and the NHC forecast shows the system as extratropical by that time. Epsilon's motion has exhibited what is likely a trochoidal wobble, which is typical of slow-moving intense hurricanes. This has resulted in a more westward track during the past 6 hours or so. The initial motion estimate is 285/7 kt, and is indeed more westward than previous estimates. However, recent satellite images indicate little short-term motion. The track model guidance is in very good agreement that Epsilon will move northwestward and then north-northwestward on Friday and Friday night. Later, the cyclone should move north of the subtropical ridge, and turn northward and northeastward. By days 4-5, the cyclone should accelerate northeastward under the influence of the mid-latitude westerlies. The official forecast is right on top of the latest corrected multi-model consensus guidance, HCCA and is only slightly west of the previous NHC track through 24 hours. This puts the closest approach of Epsilon to Bermuda between 00Z and 06Z Friday. Key Messages: 1. Tropical storm conditions are expected on Bermuda tonight, and continuing intermittently through late Thursday, when Epsilon is forecast to make its closest approach east of the island. A Tropical Storm Warning is in effect for Bermuda. 2. Dangerous surf and rip currents are likely occurring along the coasts of Bermuda, the Bahamas, the Greater Antilles, and the Leeward Islands. These conditions are expected to spread to portions of the east coast of the United States and Atlantic Canada during the next couple of days. FORECAST POSITIONS AND MAX WINDS INIT 22/0300Z 29.6N 60.6W 100 KT 115 MPH 12H 22/1200Z 30.5N 61.4W 100 KT 115 MPH 24H 23/0000Z 31.8N 61.9W 95 KT 110 MPH 36H 23/1200Z 33.2N 62.2W 90 KT 105 MPH 48H 24/0000Z 34.9N 62.2W 85 KT 100 MPH 60H 24/1200Z 36.9N 61.3W 80 KT 90 MPH 72H 25/0000Z 39.2N 58.0W 75 KT 85 MPH 96H 26/0000Z 46.5N 42.5W 60 KT 70 MPH...POST-TROP/EXTRATROP 120H 27/0000Z 56.0N 25.0W 55 KT 65 MPH...POST-TROP/EXTRATROP $$ Forecaster Pasch
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