Tornado Watch 327

Issued

Jun 18, 2014, 6:23 PM CDT (23:23 UTC)

Expired

Jun 18, 2014, 11:30 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

65 kt

The Sioux Falls radar (KFSD), 96 km from the middle of the area, began a volume at 23:26 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

50%

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

40%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1065Jun 18, 3:29 PM CDT
• Mesoscale Discussion 1074Jun 18, 8:47 PM CDT

697 
WWUS20 KWNS 182326
SEL7  
SPC WW 182326
IAZ000-MNZ000-NEZ000-SDZ000-190700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 327
NWS STORM PREDICTION CENTER NORMAN OK
625 PM CDT WED JUN 18 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EXTREME NORTHWESTERN IOWA
  EXTREME SOUTHWESTERN MINNESOTA
  NORTHEASTERN NEBRASKA
  SOUTHEASTERN SOUTH DAKOTA

* EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 625 PM
  UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
    INCHES IN DIAMETER POSSIBLE
  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST SOUTHWEST OF
MITCHELL SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST OF SIOUX FALLS
SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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...CONTINUE...WW 321...WW 322...WW
323...WW 324...WW 325...WW 326...

DISCUSSION...TORNADIC SUPERCELL IS EXPECTED TO MOVE EWD OUT OF WW
322 SOON INTO NWRN PART OF THIS WW...WHILE ADDITIONAL DVLPMT IS PSBL
BETWEEN THAT AND HIGHER-BASED ACTIVITY NOW STRENGTHENING RAPIDLY
OVER ONL AREA S OF WARM/COLD FRONTAL TRIPLE POINT.  ANY SUPERCELLS
INTERACTING WITH VORTICITY-LADEN WARM FRONTAL ZONE MAY PRODUCE
SIGNIFICANT TORNADOES...BUT ALSO EVOLVE INTO HEAVY-PRECIP MODE
RATHER QUICKLY GIVEN WEAK STORM-RELATIVE MID-UPPER WINDS.  LOW-LEVEL
HODOGRAPHS ARE FCST TO REMAIN LARGE...ESPECIALLY ALG/N OF WARM FRONT
NEAR NEB/SD BORDER.  UPSCALE GROWTH INTO MCS IS PSBL AS WELL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
650. MEAN STORM MOTION VECTOR 24020.


...EDWARDS

Tornado Watches in South Dakota, 2014Tornado Watches in Nebraska, 2014Tornado Watches in Iowa, 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.