Alabama 811 | Know What's Below.

Isaias Racing North-Northeastward Across Eastern Pennsylvania Into Southeastern New York

| August 4, 2020 @ 1:01 pm

SUMMARY OF 200 PM EDT…1800 UTC…INFORMATION

LOCATION…40.9N 75.1W
ABOUT 65 MI…105 KM w OF NEW YORK CITY
MAXIMUM SUSTAINED WINDS…65 MPH…100 KM/H
PRESENT MOVEMENT…NNE OR 20 DEGREES AT 40 MPH…65 KM/H
MINIMUM CENTRAL PRESSURE…994 MB…29.35 INCHES


SUMMARY OF WATCHES AND WARNINGS IN EFFECT

A Tropical Storm Warning is in effect for…
* North of Chincoteague Virginia to Eastport Maine
* Chesapeake Bay north of Smith Point
* Tidal Potomac River
* Delaware Bay
* Long Island and Long Island Sound
* Martha’s Vineyard, Nantucket, and Block Island


DISCUSSION AND OUTLOOK

At 200 PM EDT (1800 UTC), the center of Tropical Storm Isaias was located by NOAA Doppler weather radars and surface observations near latitude 40.9 North, longitude 75.1 West. Isaias is moving toward the north-northeast near 40 mph (65 km/h), and this general motion accompanied by some increase in forward speed is expected through tonight. On the forecast track, the center of Isaias will continue to move near or along the coast of the mid-Atlantic states today, and move across the northeastern United States into southern Canada tonight.

Data from Doppler weather radars along with surface observations indicate that maximum sustained winds have decreased to near 65 mph (100 km/h) with higher gusts. Only slow weakening is expected this afternoon, followed by a faster rate of weakening tonight. Isaias is forecast to become post-tropical tonight or early Wednesday.

Tropical-storm-force winds extend outward up to 140 miles (220 km) from the center. The New York Harbor Entrance buoy (44065) recently reported a sustained wind of 56 mph (91 km/h) and a gust to 72 mph (117 km/h).

The estimated minimum central pressure based on surface observations is 994 MB (29.35 inches).


KEY MESSAGES

1. Widespread sustained tropical-storm-force winds and gusts to hurricane force are expected along the mid-Atlantic coast, including portions of the Chesapeake Bay region, through this afternoon, which could cause tree damage and power outages. Tropical storm conditions are expected to spread across New England tonight.

2. Heavy rainfall along the East Coast, near the path of Isaias, will result in flash flooding, some of which may be significant in the mid-Atlantic and Northeast through tonight. Potentially life-threatening urban flooding remains possible in Philadelphia and elsewhere along and just west of the I-95 corridor today. Scattered minor to moderate river flooding is likely across portions of the and the Mid-Atlantic. Quick-responding rivers in the Northeast will also be susceptible to minor river flooding.

3. Numerous tornadoes have already occurred over portions of the mid-Atlantic coast this morning. The threat of tornadoes will continue along the mid-Atlantic coast spread into New England this afternoon.

All information from the National Hurricane Center’s 1:00 pm CDT Update.


Category: ALL POSTS, Severe Weather, Tropical

About the Author ()

Scott Martin is an operational meteorologist, professional graphic artist, musician, husband, and father. Not only is Scott a member of the National Weather Association, but he is also the Central Alabama Chapter of the NWA president. Scott is also the co-founder of Racecast Weather, which provides forecasts for many racing series across the USA. He also supplies forecasts for the BassMaster Elite Series events including the BassMaster Classic.

Comments are closed.