BULLETIN
Tropical Storm Isaias Intermediate Advisory Number 31A
NWS National Hurricane Center Miami FL AL092020
800 PM EDT Tue Aug 04 2020
…CENTER OF ISAIAS NOW MOVING THROUGH THE NEW ENGLAND STATES…
SUMMARY OF 800 PM EDT…0000 UTC…INFORMATION
———————————————-
LOCATION…43.6N 73.0W
ABOUT 5 MI…10 KM NNW OF RUTLAND VERMONT
MAXIMUM SUSTAINED WINDS…50 MPH…80 KM/H
PRESENT MOVEMENT…NNE OR 20 DEGREES AT 40 MPH…65 KM/H
MINIMUM CENTRAL PRESSURE…997 MB…29.44 INCHES
WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warning has been discontinued west of Watch
Hill, Rhode Island, including Long Island and Long Island Sound.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for…
* Watch Hill Rhode Island to Stonington Maine
* Martha’s Vineyard, Nantucket, and Block Island
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case
within the next 6 to 12 hours.
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 800 PM EDT (0000 UTC), the center of Tropical Storm Isaias was
located by NOAA Doppler weather radars and surface observations near
latitude 43.6 North, longitude 73.0 West. Isaias is moving toward
the north-northeast near 40 mph (65 km/h), and this general motion
is expected through tonight. On the forecast track, the center of
Isaias will continue to move farther inland over eastern New York
and Vermont this afternoon and evening, and over southern Canada
tonight.
Data from Doppler weather radars along with surface observations
indicate that maximum sustained winds have decreased to near 50 mph
(80 km/h) with higher gusts. Continued weakening is expected this
evening, and Isaias is forecast to become post-tropical tonight or
early Wednesday.
Tropical-storm-force winds extend outward up to 205 miles (335 km)
from the center. During the past few hours, there have been numerous
reports of wind gusts of 40-50 mph (65-80 km/h) across portions of
Rhode Island, eastern Massachusetts, and southeastern New Hampshire.
The estimated minimum central pressure based on surface
observations is 997 mb (29.44 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: Widespread tropical-storm conditions are expected tonight in
the tropical storm warning area in southern New England. These
winds could cause significant tree damage and power outages.
Gale-force winds are expected to spread into southeastern Quebec
tonight and Wednesday. 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 northeast New York, northern
Vermont, northern New Hampshire, and Southern Quebec.
Heavy rainfall near the path of Isaias could result in flash
flooding, particularly through urban areas and the surrounding
terrain of the Adirondack and Green Mountain Ranges through tonight.
Scattered minor to moderate and isolated major river flooding is
ongoing or forecast across portions of the Mid-Atlantic.
Quick-responding rivers in the Northeast will also be susceptible to
minor and possible moderate river flooding.
TORNADOES: A couple of tornadoes are possible across southern New
England through this evening.
SURF: Swells generated by Isaias will spread northward along the
mid-Atlantic and Northeast coasts of the United States through
tonight. These swells are likely to cause life-threatening surf and
rip current conditions. Please consult products from your local
weather office.