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Tropical Storm Zeta Forecast Discussion Number 5

2020-10-25 21:55:11| National Hurricane Center (Atlantic)

Issued at 500 PM EDT Sun Oct 25 2020 000 WTNT43 KNHC 252055 TCDAT3 Tropical Storm Zeta Discussion Number 5 NWS National Hurricane Center Miami FL AL282020 500 PM EDT Sun Oct 25 2020 Although the overall cloud pattern of Zeta is still not very well organized, with a lack of distinct banding features, it continues to generate very intense deep convection mainly over the southeastern portion of the circulation. Moreover, in spite of its ragged appearance, the storm has strengthened today. Reports from a NOAA Hurricane Hunter aircraft investigating the system this afternoon indicate that, based on adjusted flight-level and SFMR-observed surface winds, the intensity has increased to near 45 kt and the central pressure has fallen to 999 mb. Since the storm will be moving over the high oceanic heat content of the northwestern Caribbean Sea and in a moist environment with low vertical shear through Monday, strengthening is forecast and Zeta will likely become a hurricane before it nears the Yucatan Peninsula in a day or so. After Zeta moves into the Gulf of Mexico, southwesterly shear is likely to increase and oceanic heat content below the cyclone will diminish, especially when the system approaches the northern Gulf coast on Wednesday. Therefore, no strengthening is forecast in 2-3 days and Zeta could be weakening by the time it reaches the northern Gulf coast. However, the intensity forecast is still subject to significant uncertainty. The center has been meandering this afternoon, and apparently has reformed nearer to the deep convection over the southeastern quadrant. Since this is not considered representative of larger-scale motion, the system is still considered to be quasi-stationary at this time. However, the track guidance is in agreement that Zeta will move northwestward over the next 1-2 days, passing near or over the Yucatan Peninsula. Thereafter, the cyclone is likely to turn north-northwestward to northward while it moves on the western side of a mid-tropospheric anticyclone near Florida. A turn toward the north-northeast is expected when Zeta nears the northern Gulf coast, due to an approaching shortwave trough. The track guidance has more than the usual amount of spread at the 72-hour time frame, with the ECMWF and the GFS predictions being about 300 miles apart near the northern Gulf coast. The official forecast track lies between these 2 solutions, and is similar to the previous NHC track. However, given the inherent uncertainties, one should not focus on the exact forecast track. Based on the new intensity forecast, the government of Mexico has issued a Hurricane Warning for a portion of the Yucatan peninsula. KEY MESSAGES: 1. Hurricane conditions and storm surge are expected in portions of the northern Yucatan Peninsula of Mexico Monday night and early Tuesday. Tropical storm conditions could occur over extreme western Cuba on Monday. 2. Through Wednesday, heavy rainfall is expected from Zeta across portions of central and western Cuba, the Cayman Islands, Jamaica, the northeast Yucatan peninsula of Mexico, southern Florida and the Keys. This rainfall may lead to flash flooding in urban areas. 3. Zeta is forecast to be at or just below hurricane strength when it approaches the northern Gulf Coast on Wednesday, and there is an increasing risk of storm surge, rainfall, and wind impacts from Louisiana to the Florida Panhandle. Residents in these areas should monitor the progress of Zeta and updates to the forecast. FORECAST POSITIONS AND MAX WINDS INIT 25/2100Z 17.7N 83.4W 45 KT 50 MPH 12H 26/0600Z 18.7N 84.3W 55 KT 65 MPH 24H 26/1800Z 19.7N 85.7W 65 KT 75 MPH 36H 27/0600Z 21.1N 87.6W 65 KT 75 MPH...INLAND 48H 27/1800Z 23.2N 89.6W 65 KT 75 MPH 60H 28/0600Z 25.7N 90.8W 65 KT 75 MPH 72H 28/1800Z 29.4N 90.3W 60 KT 70 MPH...INLAND 96H 29/1800Z 37.0N 83.0W 25 KT 30 MPH...INLAND 120H 30/1800Z...DISSIPATED $$ Forecaster Pasch

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Tropical Storm Epsilon Graphics

2020-10-25 21:38:38| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Sun, 25 Oct 2020 20:38:38 GMT Wind Speed Probabilities last updated Sun, 25 Oct 2020 21:25:17 GMT

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Summary for Tropical Storm Epsilon (AT2/AL272020)

2020-10-25 21:36:45| National Hurricane Center (Atlantic)

...LARGE EPSILON IS NEARLY EXTRATROPICAL AS IT CONTINUES RACING EAST-NORTHEASTWARD... ...HIGH SURF AND RIP CURRENTS POSSIBLE ALONG ATLANTIC BEACHES THROUGH MONDAY... As of 9:00 PM GMT Sun Oct 25 the center of Epsilon was located near 46.2, -44.3 with movement ENE at 46 mph. The minimum central pressure was 964 mb with maximum sustained winds of about 70 mph.

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Tropical Storm Epsilon Forecast Discussion Number 28

2020-10-25 21:36:45| National Hurricane Center (Atlantic)

Issued at 900 PM GMT Sun Oct 25 2020 000 WTNT42 KNHC 252036 TCDAT2 Tropical Storm Epsilon Discussion Number 28 NWS National Hurricane Center Miami FL AL272020 900 PM GMT Sun Oct 25 2020 Epsilon is nearly extratropical, with late morning scatterometer data showing that the circulation has become stretched out as the cyclone interacts with a high-latitude low pressure system and an associated mid- upper-level trough to its north. The main reason that the cyclone is still classifiable as a tropical cyclone is persistent deep convection very near the center of circulation. Based on the scatterometer data showing an area of peak winds of 56 kt, the initial intensity is being lowered to 60 kt. What remains of the trapped tropical airmass near the center of the cyclone supporting the deep convection should mix out over the next few hours, as Epsilon moves over cold waters of about 15 degrees C and continues to wrap cooler and stable air into its circulation. The post-tropical cyclone will remain large and powerful until it is absorbed by another large extratropical low over the north Atlantic in about 24-36 h. Epsilon is racing east-northeastward at around 40 kt, embedded within the mid-latitude westerlies. A fast east-northeastward or northeastward motion is expected to continue until the system gets absorbed by the aforementioned high-latitude low pressure system. The latest NHC forecast track is essentially an update of the previous one and remains in the middle of the tightly clustered consensus guidance. FORECAST POSITIONS AND MAX WINDS INIT 25/2100Z 46.2N 44.3W 60 KT 70 MPH 12H 26/0600Z 49.4N 35.8W 55 KT 65 MPH...POST-TROP/EXTRATROP 24H 26/1800Z 54.4N 26.2W 55 KT 65 MPH...POST-TROP/EXTRATROP 36H 27/0600Z...ABSORBED $$ Forecaster Latto

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Tropical Storm Zeta Graphics

2020-10-25 19:06:31| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Sun, 25 Oct 2020 18:06:31 GMT Wind Speed Probabilities last updated Sun, 25 Oct 2020 15:32:54 GMT

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