Tornado Watch 706

Issued

Jul 19, 2008, 7:59 PM CDT (00:59 UTC)

Expired

Jul 20, 2008, 12:00 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 00:58 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

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

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1818Jul 19, 6:56 PM CDT
• Mesoscale Discussion 1820Jul 19, 11:24 PM CDT

000
WWUS20 KWNS 200057
SEL6  
SPC WW 200057
IAZ000-ILZ000-200500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 706
NWS STORM PREDICTION CENTER NORMAN OK
800 PM CDT SAT JUL 19 2008

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

       SOUTHERN AND EASTERN IOWA
       FAR NORTHWEST ILLINOIS

EFFECTIVE THIS SATURDAY NIGHT FROM 800 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EITHER SIDE OF A LINE FROM 30 MILES NORTH OF MOLINE
ILLINOIS TO 50 MILES SOUTH OF DENISON IOWA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 703...WW 704...WW 705...

DISCUSSION...BROKEN LINE OF SUPERCELLS/BOW ECHOES WILL CONTINUE
SAGGING SSEWD ACROSS WW THROUGH THE EVENING WITHIN A VERY UNSTABLE
AIR MASS.  WSWLY LLJ FROM 25-30 KT IS FORECAST TO DEVELOP THIS
EVENING ACROSS THIS REGION...ENHANCING LOW LEVEL SHEAR AND POTENTIAL
FOR TORNADOES.  DAMAGING WINDS AND ISOLATED LARGE HAIL WILL BE
ADDITIONAL HAZARDS.

AVIATION...TORNADOES AND 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 34035.


...EVANS

Tornado Watches in Iowa, 2008Tornado Watches in Illinois, 2008Every tornado 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; radar from the NEXRAD Level II archive.