Tornado Watch 319

Issued

Jun 17, 2014, 11:39 PM CDT (04:39 UTC)

Expired

Jun 18, 2014, 4:29 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Sioux Falls radar (KFSD), 104 km from the middle of the area, began a volume at 04:42 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

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

20%

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 1046Jun 17, 7:44 PM CDT
• Mesoscale Discussion 1050Jun 17, 10:18 PM CDT
• Mesoscale Discussion 1051Jun 17, 10:36 PM CDT
• Mesoscale Discussion 1052Jun 17, 11:01 PM CDT
• Mesoscale Discussion 1053Jun 17, 11:23 PM CDT
• Mesoscale Discussion 1057Jun 18, 1:52 AM CDT
• Mesoscale Discussion 1058Jun 18, 3:07 AM CDT

142 
WWUS20 KWNS 180437
SEL9  
SPC WW 180437
IAZ000-MNZ000-NEZ000-SDZ000-181000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 319
NWS STORM PREDICTION CENTER NORMAN OK
1135 PM CDT TUE JUN 17 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHWEST AND NORTH CENTRAL IOWA
  SOUTHWEST AND SOUTH CENTRAL MINNESOTA
  EXTREME NORTHEAST NEBRASKA
  SOUTHEAST SOUTH DAKOTA

* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1135 PM
  UNTIL 500 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST OF SIOUX
FALLS SOUTH DAKOTA TO 20 MILES EAST OF MASON CITY IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 315. WATCH NUMBER 315 WILL NOT BE IN EFFECT AFTER
1135 PM CDT. CONTINUE...WW 316...WW 317...WW 318...

DISCUSSION...CLUSTERS OF SUPERCELLS WILL PERSIST FOR A FEW HOURS IN
THE WARM ADVECTION REGIME ALONG A STATIONARY FRONT...WHERE THE LOW
LEVELS REMAIN MOIST AND STRONG INSTABILITY IS ROOTED AT THE SURFACE.
VERTICAL SHEAR IS FAVORABLE FOR ROTATING STORMS AND THE POTENTIAL
FOR TORNADOES...ESPECIALLY IN THE NEXT 1-2 HOURS. 
EVENTUALLY...STORMS ARE EXPECTED TO CONGEAL INTO A LARGER
CLUSTER/MCS WITH AN ATTENDANT RISK FOR DAMAGING WINDS AND LARGE
HAIL.

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
550. MEAN STORM MOTION VECTOR 29015.


...THOMPSON

Tornado Watches in Iowa, 2014Tornado Watches in Minnesota, 2014Tornado Watches in South Dakota, 2014Every tornado watch in 2014

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.