Severe Thunderstorm Watch 608

Issued

Jul 7, 2011, 5:03 PM CDT (22:03 UTC)

Expired

Jul 8, 2011, 12:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Springfield radar (KSGF), 141 km from the middle of the area, began a volume at 22:05 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

30%

One or more gusts of 65 knots or more

30%

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

70%

• Mesoscale Discussion 1533Jul 7, 1:54 PM CDT
• Mesoscale Discussion 1535Jul 7, 7:58 PM CDT

552 
WWUS20 KWNS 072205
SEL8  
SPC WW 072205
ARZ000-ILZ000-MOZ000-080500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 608
NWS STORM PREDICTION CENTER NORMAN OK
505 PM CDT THU JUL 7 2011

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

       NORTHERN ARKANSAS
       SOUTHWEST ILLINOIS
       EASTERN AND SOUTHERN MISSOURI

EFFECTIVE THIS THURSDAY AFTERNOON FROM 505 PM UNTIL MIDNIGHT CDT.

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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST
NORTHWEST OF SPRINGFIELD MISSOURI TO 25 MILES EAST NORTHEAST OF
CAPE GIRARDEAU MISSOURI.  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...TSTMS ARE INTENSIFYING ALONG ENE-WSW ORIENTED
BAROCLINIC ZONE FROM N OF TBN TO VICINITY OF STL...AS WELL AS ALONG
MORE N-S ORIENTED WARM FRONT NE OF HRO.  AMBIENT WARM SECTOR AIR
MASS IS QUITE MOIST WITH DEWPOINTS IN THE LOW/MID 70S WHICH IS
LARGELY CONTRIBUTING TO MLCAPE OF 1500-3500 J/KG.  WHEN COUPLED WITH
A KINEMATIC ENVIRONMENT FEATURING PRONOUNCED VEERING OF WINDS WITH
HEIGHT AND 30-40 KT OF DEEP NWLY SHEAR...SETUP WILL FAVOR THE
DEVELOPMENT OF SUPERCELLS AND ORGANIZED MULTICELL STRUCTURES.  WHILE
A TORNADO IS POSSIBLE...LARGE HAIL AND DAMAGING WINDS APPEAR TO BE
THE PRIMARY HAZARDS.

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 550. MEAN STORM
MOTION VECTOR 30025.


...MEAD

Severe Thunderstorm Watches in Missouri, 2011Severe Thunderstorm Watches in Illinois, 2011Every severe thunderstorm watch in 2011

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.