Tornado Watch 497

Issued

Aug 22, 2015, 2:35 PM CDT (19:35 UTC)

Expired

Aug 22, 2015, 9:49 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Minneapolis radar (KMPX), 125 km from the middle of the area, began a volume at 19:39 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

90%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1731Aug 22, 2:13 PM CDT
• Mesoscale Discussion 1732Aug 22, 2:35 PM CDT
• Mesoscale Discussion 1735Aug 22, 5:52 PM CDT
• Mesoscale Discussion 1739Aug 22, 8:06 PM CDT

918 
WWUS20 KWNS 221932
SEL7  
SPC WW 221932
IAZ000-MNZ000-NEZ000-SDZ000-WIZ000-230400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 497
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT SAT AUG 22 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN AND WESTERN IOWA
  SOUTHERN AND CENTRAL MINNESOTA
  FAR NORTHEAST NEBRASKA
  FAR EASTERN SOUTH DAKOTA
  FAR WESTERN WISCONSIN

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
  1100 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  WIDESPREAD DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
    TO 75 MPH POSSIBLE
  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
    TO 2 INCHES IN DIAMETER POSSIBLE

SUMMARY...THUNDERSTORMS...INCLUDING SHORT LINES AND BANDS OF
SUPERCELLS...EXPECTED TO FORM OVER WATCH AREA BEGINNING LATER THIS
AFTERNOON...CONTINUING INTO TONIGHT. THE STORMS WILL MOVE/DEVELOP
GENERALLY NORTHEAST AND WILL BE CAPABLE OF TORNADOES...DAMAGING
WIND...AND HAIL.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF
SAINT CLOUD MINNESOTA TO 30 MILES SOUTH SOUTHEAST OF STORM LAKE
IOWA.  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.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 22035.


...CORFIDI

Tornado Watches in Minnesota, 2015Tornado Watches in Iowa, 2015Tornado Watches in South Dakota, 2015Every tornado watch in 2015

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.