Severe Thunderstorm Watch 430

Issued

Jul 22, 2014, 2:57 PM MDT (20:57 UTC)

Expired

Jul 22, 2014, 10:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Rapid City radar (KUDX), 219 km from the middle of the area, began a volume at 20:57 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

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

60%

• Mesoscale Discussion 1429Jul 22, 2:02 PM MDT
• Mesoscale Discussion 1431Jul 22, 2:30 PM MDT
• Mesoscale Discussion 1435Jul 22, 6:21 PM MDT
• Mesoscale Discussion 1437Jul 22, 8:17 PM MDT

064 
WWUS20 KWNS 222058
SEL0  
SPC WW 222058
MTZ000-NDZ000-SDZ000-WYZ000-230400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
300 PM MDT TUE JUL 22 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  SOUTHEAST MONTANA
  SOUTHWEST NORTH DAKOTA
  WESTERN SOUTH DAKOTA
  NORTHEAST WYOMING

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
  1000 PM MDT.

* PRIMARY THREATS INCLUDE...
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5
    INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST OF
GLENDIVE MONTANA TO 95 MILES SOUTHWEST OF RAPID CITY SOUTH
DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

&&

DISCUSSION...ISOLATED/WIDELY SCATTERED STORMS SHOULD CONTINUE TO
DEVELOP AND SPREAD GENERALLY SPREAD EAST-SOUTHEASTWARD THROUGH THE
EARLY/MID-EVENING HOURS. RELATIVELY STRONG VERTICAL SHEAR AND
MODERATE BUOYANCY WILL SUPPORT SUPERCELLS CAPABLE OF LARGE
HAIL...AND TO A LESSER EXTENT...LOCALLY DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29020.


...GUYER

Severe Thunderstorm Watches in South Dakota, 2014Severe Thunderstorm Watches in Montana, 2014Severe Thunderstorm Watches in North Dakota, 2014Every severe thunderstorm 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.