Wednesday, August 21, 2019

URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 609


URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 609
NWS Storm Prediction Center Norman OK
150 PM EDT Wed Aug 21 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Connecticut
  Massachusetts
  Far southern Maine
  Southern New Hampshire
  Northern New Jersey
  Southeast New York
  Rhode Island
  Southern Vermont
  Coastal Waters

* Effective this Wednesday afternoon and evening from 150 PM
  until 900 PM EDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Isolated large hail events to 1.5 inches in diameter possible
  A tornado or two possible

SUMMARY...Storms will continue to develop and intensify particularly
across far eastern New York and southern New England, near and south
of a warm front that will continue to spread slowly northward. Some
supercells with a hail/tornado risk aside from damaging winds are
most probable across southern New England, with damaging winds
otherwise expected with the strongest storms.

The severe thunderstorm watch area is approximately along and 85
statute miles north and south of a line from 30 miles west northwest
of Poughkeepsie NY to 40 miles east of Boston MA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24025.

...Guyer


======================================================================

487
WWUS40 KWNS 211750
WWP9

SEVERE THUNDERSTORM WATCH PROBABILITIES FOR WS 0609
NWS STORM PREDICTION CENTER NORMAN OK
1247 PM CDT WED AUG 21 2019

WS 0609
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES                        :  20%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES       : <02%
PROB OF 10 OR MORE SEVERE WIND EVENTS              :  50%
PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS          :  10%
PROB OF 10 OR MORE SEVERE HAIL EVENTS              :  30%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES          :  20%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS :  80%

&&
ATTRIBUTE TABLE:
MAX HAIL /INCHES/                            : 1.5
MAX WIND GUSTS SURFACE /KNOTS/               : 60
MAX TOPS /X 100 FEET/                        : 500
MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 24025
PARTICULARLY DANGEROUS SITUATION             : NO

&&
FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND
WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU9.

$$

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