Tornado Watch 530

Issued

Jun 20, 2011, 10:58 PM CDT (03:58 UTC)

Expired

Jun 21, 2011, 2:39 AM CDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 91 km from the middle of the area, began a volume at 03:58 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

5%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1333Jun 20, 9:02 PM CDT
• Mesoscale Discussion 1334Jun 20, 10:22 PM CDT
• Mesoscale Discussion 1335Jun 21, 1:25 AM CDT

780 
WWUS20 KWNS 210359
SEL0
SPC WW 210359
IAZ000-MNZ000-211100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 530
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CDT MON JUN 20 2011

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

       EASTERN IOWA
       SOUTHERN MINNESOTA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1100 PM
UNTIL 600 AM CDT.

TORNADOES...HAIL TO 1.5 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 EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHEAST OF
FAIRMONT MINNESOTA TO 35 MILES SOUTH OF OTTUMWA IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 525...WW 526...WW
528...WW 529...

DISCUSSION...BROKEN SQLN EXPECTED TO CONTINUE MOVING NEWD THROUGH
CNTRL IA INTO S CNTRL MN.  STRENGTH OF LOW LVL SHEAR AND QUALITY OF
MOIST SELY LOW LVL INFLOW SUGGEST CONTINUED POTENTIAL FOR EMBEDDED
LOW LVL MESOCYCLONES/POSSIBLE TORNADOES.  WDLY SCTD MORE DISCRETE
STORMS WITH A POTENTIAL FOR TORNADOES ALSO MAY FORM AHEAD OF SQLN
INVOF DIFFUSE W-E WARM FRONT...WHERE NEAR SFC FLOW WILL REMAIN MORE
STRONGLY BACKED.

AVIATION...TORNADOES AND 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
550. MEAN STORM MOTION VECTOR 20030.


...CORFIDI

Tornado Watches in Iowa, 2011Tornado Watches in Minnesota, 2011Every tornado 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.