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Post-Tropical Cyclone Isaias Forecast Advisory Number 33

2020-08-05 10:37:17| National Hurricane Center (Atlantic)

Issued at 0900 UTC WED AUG 05 2020 562 WTNT24 KNHC 050837 TCMAT4 POST-TROPICAL CYCLONE ISAIAS FORECAST/ADVISORY NUMBER 33 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092020 0900 UTC WED AUG 05 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. POST-TROPICAL CYCLONE CENTER LOCATED NEAR 47.5N 71.8W AT 05/0900Z POSITION ACCURATE WITHIN 40 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 15 DEGREES AT 24 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1000 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT.......120NE 90SE 0SW 0NW. 12 FT SEAS.. 0NE 480SE 0SW 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 47.5N 71.8W AT 05/0900Z AT 05/0600Z CENTER WAS LOCATED NEAR 46.4N 72.1W FORECAST VALID 05/1800Z 50.7N 70.6W...POST-TROP/EXTRATROP MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 06/0600Z 53.3N 69.0W...POST-TROP/EXTRATROP MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 06/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 47.5N 71.8W THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON THIS SYSTEM. $$ FORECASTER BROWN

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Post-Tropical Cyclone Isaias Graphics

2020-08-05 07:50:48| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Wed, 05 Aug 2020 05:50:48 GMT Wind Speed Probabilities last updated Wed, 05 Aug 2020 03:23:32 GMT

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Summary for Post-Tropical Cyclone Isaias (AT4/AL092020)

2020-08-05 07:50:47| National Hurricane Center (Atlantic)

...ISAIAS PRODUCING GUSTY WINDS AND HEAVY RAINFALL OVER SOUTHEASTERN QUEBEC... As of 2:00 AM EDT Wed Aug 5 the center of Isaias was located near 46.1, -72.2 with movement NNE at 35 mph. The minimum central pressure was 1000 mb with maximum sustained winds of about 40 mph.

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Post-Tropical Cyclone Isaias Public Advisory Number 32A

2020-08-05 07:50:47| National Hurricane Center (Atlantic)

Issued at 200 AM EDT Wed Aug 05 2020 000 WTNT34 KNHC 050550 TCPAT4 BULLETIN Post-Tropical Cyclone Isaias Intermediate Advisory Number 32A NWS National Hurricane Center Miami FL AL092020 200 AM EDT Wed Aug 05 2020 ...ISAIAS PRODUCING GUSTY WINDS AND HEAVY RAINFALL OVER SOUTHEASTERN QUEBEC... SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...46.1N 72.2W ABOUT 70 MI...110 KM SW OF QUEBEC CITY MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNE OR 20 DEGREES AT 35 MPH...56 KM/H MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Tropical Storm Warning from Merrimack River Massachusetts to Stonington Maine has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: There are no coastal watches or warnings in effect. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 200 AM EDT (0600 UTC), the center of Post-Tropical Cyclone Isaias was located near latitude 46.1 North, longitude 72.2 West. The post-tropical cyclone is moving toward the north-northeast near 35 mph (56 km/h), and this general motion is expected with a decrease in forward speed through tonight. Maximum sustained winds have decreased to near 40 mph (65 km/h) with higher gusts. Continued weakening is expected, and the winds are expected to drop below tropical-storm force during the next few hours. The post-tropical cyclone is expected to dissipate over southeastern Canada tonight or on Thursday. Tropical-storm-force winds extend outward up to 90 miles (165 km) to the northeast and east of the center. The estimated minimum central pressure is 1000 mb (29.53 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. WIND: Gale-force winds are possible over portions of southeastern Quebec for a few more hours. See products issued by Environment Canada for more information. RAINFALL: Rainfall accumulations of 1 to 3 inches are expected along and near the track of Isaias across Southern Quebec. Additional rainfall of up to an inch is possible across western and northern Maine overnight. As the rainfall exits the United States, scattered minor to moderate and isolated major river flooding is ongoing or forecast across portions of the Mid-Atlantic with most rivers falling below flood stage today. Quick-responding rivers in the Northeast will also be susceptible to minor and possible moderate river flooding. SURF: Swells generated by Isaias will affect the mid-Atlantic and Northeast coasts of the United States through this morning. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 500 AM EDT. $$ Forecaster Brown/Berg

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