Severe Thunderstorm Watch 708

Issued

Jul 20, 2008, 12:35 PM EDT (16:35 UTC)

Expired

Jul 20, 2008, 8:00 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1823Jul 20, 11:29 AM EDT
• Mesoscale Discussion 1824Jul 20, 12:53 PM EDT
• Mesoscale Discussion 1828Jul 20, 4:28 PM EDT

000
WWUS20 KWNS 201635
SEL8  
SPC WW 201635
NYZ000-OHZ000-PAZ000-WVZ000-210000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 708
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM EDT SUN JUL 20 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       MUCH OF WESTERN NEW YORK
       SMALL PART OF EASTERN OHIO
       MUCH OF WESTERN AND NORTHERN PENNSYLVANIA
       SMALL PART OF NORTHERN WEST VIRGINIA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
800 PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH
SOUTHWEST OF YOUNGSTOWN OHIO TO 20 MILES EAST NORTHEAST OF ELMIRA
NEW YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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.

DISCUSSION...THUNDERER STORMS WILL INCREASE IN NUMBER AND INTENSITY
ACROSS THE WATCH AS HEATING CONTINUES TO DESTABILIZE THE AIR MASS
AND ELIMINATE ANY REMAINING CINH.  WITH 30KT OF DEEP LAYER SHEAR AND
MLCAPES AOA 1500 J/KG...DAMAGING WINDS WILL BE THE PREDOMINATE
THREAT AS STORMS DEVELOP INTO LINE SEGMENTS...SHORT BOWS.

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 26030.


...HALES

Severe Thunderstorm Watches in Pennsylvania, 2008Severe Thunderstorm Watches in New York, 2008Severe Thunderstorm Watches in Ohio, 2008Every severe thunderstorm watch in 2008

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.