( cyclocane is a CYCLOne and hurriCANE tracker by hayley )
This is the final warning / advisory for this storm as it has weakened below warning levels and/or the storm system is no longer a tropical cyclone.
Current Wind Speed 35 knots / 40 MPH
Max Predicted Wind Speed 35 knots / 40 MPH at
Spaghetti models for ISAIAS can be found here:
000 WTNT34 KNHC 050837 TCPAT4 BULLETIN Post-Tropical Cyclone Isaias Advisory Number 33 NWS National Hurricane Center Miami FL AL092020 500 AM EDT Wed Aug 05 2020 ...RAIN AND GUSTY WINDS CONTINUE TO SPREAD OVER EASTERN QUEBEC... ...THIS IS THE LAST NHC ADVISORY... SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...47.5N 71.8W ABOUT 55 MI...90 KM NNW OF QUEBEC CITY MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNE OR 15 DEGREES AT 28 MPH...44 KM/H MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 500 AM EDT (0900 UTC), the center of Post-Tropical Cyclone Isaias was located near latitude 47.5 North, longitude 71.8 West. The post-tropical cyclone is moving toward the north-northeast near 28 mph (44 km/h), and this general motion is expected with a decrease in forward speed through tonight. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Weakening is expected, and the winds are expected to drop below tropical-storm force this morning. The post-tropical cyclone is expected to dissipate over southeastern Canada on Thursday. Tropical-storm-force winds extend outward up to 140 miles (220 km) to the northeast and east of the center primarily over and near the St. Lawrence River. The estimated minimum central pressure is 1000 mb (29.53 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Gale-force winds will continue over and near the St. Lawrence River this morning. Gale-force wind gusts are possible elsewhere over southeastern Quebec today. 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. Even though the rainfall has ended, scattered minor to moderate and isolated major river flooding is ongoing across portions of the Mid-Atlantic with most rivers expected to fall below flood stage by later today. SURF: Swells generated by Isaias will affect the coast of the Northeast 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 ------------- This is the last public advisory issued by the National Hurricane Center on this system. Additional information on the post-tropical cyclone can be found in products issued by the Canadian Hurricane Center at https://weather.gc.ca/hurricane/index_e.html $$ Forecaster Brown
Public Advisory not available for this storm.
000 WTNT44 KNHC 050838 TCDAT4 Post-Tropical Cyclone Isaias Discussion Number 33 NWS National Hurricane Center Miami FL AL092020 500 AM EDT Wed Aug 05 2020 Surface observations indicate that Isaias continues to gradually weaken over southeastern Quebec. There have been a couple of observing sites with marine exposure along the St. Lawrence River that have reported winds of around 35 kt within the past few hours. Therefore, the initial intensity is set at that value for this advisory. The post-tropical cyclone should continue to weaken today, and the system is expected to be absorbed by a larger extratropical low over eastern Canada on Thursday. The cyclone has begun to decelerate and is now moving 015/24 kt. The post-tropical cyclone should continue on a general north-northeastward motion with an additional decrease in forward speed over the next 12-24 hours. The updated NHC track forecast is similar to previous advisory and is near the middle of the tightly clustered dynamical model guidance. This is the last NHC advisory on Isaias. Additional information on the post-tropical cyclone can be found in products issued by the Canadian Hurricane Center at: https://weather.gc.ca/hurricane/index_e.html FORECAST POSITIONS AND MAX WINDS INIT 05/0900Z 47.5N 71.8W 35 KT 40 MPH...POST-TROPICAL 12H 05/1800Z 50.7N 70.6W 30 KT 35 MPH...POST-TROP/EXTRATROP 24H 06/0600Z 53.3N 69.0W 25 KT 30 MPH...POST-TROP/EXTRATROP 36H 06/1800Z...DISSIPATED $$ Forecaster Brown
|35 knots||47.5, -71.8||translation missing: en.POST-TROPICAL|
|30 knots||50.7, -70.6||POST-TROPICAL CYCLONE|
|25 knots||53.3, -69.0||POST-TROPICAL CYCLONE|
|0 knots||translation missing: en.DISSIPATED|
site by Hayley Croft