Tornado Watch 488

Issued

Jun 8, 2008, 1:21 PM CDT (18:21 UTC)

Expired

Jun 8, 2008, 7:52 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 70 km from the middle of the area, began a volume at 18:22 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

70%

• Mesoscale Discussion 1278Jun 8, 12:28 PM CDT
• Mesoscale Discussion 1284Jun 8, 3:47 PM CDT

000
WWUS20 KWNS 081821
SEL8  
SPC WW 081821
IAZ000-090100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 488
NWS STORM PREDICTION CENTER NORMAN OK
125 PM CDT SUN JUN 8 2008

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

       CENTRAL AND SOUTHERN IOWA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 800
PM 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST OF LAMONI IOWA
TO 50 MILES NORTH NORTHEAST OF DES MOINES IOWA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).

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 485...WW 486...WW 487...

DISCUSSION...THUNDERSTORMS HAVE BEGUN TO FORM ALONG SURFACE FRONT
OVER SOUTHWEST IA.  THESE STORMS ARE IN REGION OF VERY MOIST AND
MODERATELY UNSTABLE AIRMASS.  ACTIVITY WILL LIKELY TRACK
EAST-NORTHEASTWARD AND INTERACT WITH REMNANT OUTFLOW BOUNDARY FOR
MORNING CONVECTION.  SUPERCELLS CAPABLE OF DAMAGING WINDS...ISOLATED
TORNADOES...AND HAIL ARE POSSIBLE.

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 24035.


...HART

Tornado Watches in Iowa, 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.