Severe Thunderstorm Watch 447

Issued

Jul 1, 2012, 5:40 PM EDT (21:40 UTC)

Expired

Jul 1, 2012, 9:55 PM EDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Cleveland radar (KCLE), 101 km from the middle of the area, began a volume at 21:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1339Jul 1, 3:56 PM EDT
• Mesoscale Discussion 1343Jul 1, 5:19 PM EDT
• Mesoscale Discussion 1347Jul 1, 6:47 PM EDT
• Mesoscale Discussion 1349Jul 1, 7:22 PM EDT
• Mesoscale Discussion 1352Jul 1, 8:21 PM EDT

192 
WWUS20 KWNS 012137
SEL7
SPC WW 012137
OHZ000-LEZ000-020300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 447
NWS STORM PREDICTION CENTER NORMAN OK
540 PM EDT SUN JUL 1 2012

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

       NORTHWEST OHIO
       LAKE ERIE

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 540 PM UNTIL
1100 PM EDT.

HAIL TO 2 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH
SOUTHWEST OF TOLEDO OHIO TO 35 MILES EAST OF MANSFIELD OHIO.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 442...WW 443...WW
444...WW 445...WW 446...

DISCUSSION...THUNDERSTORMS ARE INCREASING OVER NORTHEAST
IND/SOUTHEAST LOWER MI AND OVER WESTERN LAKE ERIE.  THESE STORMS ARE
EXPECTED TO TRACK SOUTHEASTWARD FOR SEVERAL HOURS AND AFFECT
NORTHWEST OH.  HOT SURFACE TEMPERATURES...MODERATE INSTABILITY...AND
FAVORABLE WINDS ALOFT WILL PROMOTE A RISK OF A FEW SEVERE STORMS
CAPABLE OF DAMAGING WINDS AND HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 30030.


...HART

Severe Thunderstorm Watches in Ohio, 2012Every severe thunderstorm watch in 2012

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; radar from the NEXRAD Level II archive.