Tornado Watch 169

Issued

Apr 14, 2012, 5:00 PM CDT (22:00 UTC)

Expired

Apr 15, 2012, 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 Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 22:00 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

30%

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 528Apr 14, 2:15 PM CDT
• Mesoscale Discussion 532Apr 14, 4:47 PM CDT
• Mesoscale Discussion 534Apr 14, 6:57 PM CDT
• Mesoscale Discussion 536Apr 14, 7:50 PM CDT
• Mesoscale Discussion 541Apr 14, 11:28 PM CDT

291 
WWUS20 KWNS 142159
SEL9
SPC WW 142159
IAZ000-KSZ000-MOZ000-150500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 169
NWS STORM PREDICTION CENTER NORMAN OK
500 PM CDT SAT APR 14 2012

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

       SOUTHERN IOWA
       FAR NORTHEAST KANSAS
       NORTHERN MISSOURI

EFFECTIVE THIS SATURDAY AFTERNOON FROM 500 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 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF SHENANDOAH
IOWA TO 25 MILES SOUTH SOUTHEAST OF OTTUMWA IOWA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU9).

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 165...WW 166...WW
167...WW 168...

DISCUSSION...EVOLVING BOW ECHO/HP SUPERCELL OVER SERN NEB IS
EXPECTED TO CONTINUE ENEWD ALONG WARM FRONT...POTENTIALLY ENHANCING
DOWNSTREAM STORM DEVELOPMENT ALONG WARM FRONT.  LATEST MODEL
GUIDANCE INDICATES THAT A SSWLY LLJ WILL STRENGTHEN TO 50+ KT ACROSS
REGION TONIGHT...ENHANCING CONVERGENCE ALONG WARM FRONT...AND
LOW-LEVEL SHEAR.  AS SUCH...A RISK FOR TORNADOES...DAMAGING WINDS
AND LARGE HAIL WILL EXIST WITH ANY SUSTAINED STORM STRUCTURES.

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.


...MEAD

Tornado Watches in Iowa, 2012Tornado Watches in Missouri, 2012Tornado Watches in Kansas, 2012Every tornado 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.