Tornado Watch 324

Issued

Jun 21, 2015, 2:23 PM MDT (20:23 UTC)

Expired

Jun 21, 2015, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Two or more tornadoes

30%

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

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1104Jun 21, 1:28 PM MDT
• Mesoscale Discussion 1107Jun 21, 4:24 PM MDT
• Mesoscale Discussion 1110Jun 21, 7:32 PM MDT

966 
WWUS20 KWNS 212021
SEL4  
SPC WW 212021
MTZ000-NDZ000-SDZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 324
NWS STORM PREDICTION CENTER NORMAN OK
220 PM MDT SUN JUN 21 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EASTERN MONTANA
  WESTERN AND CENTRAL NORTH DAKOTA
  NORTHERN SOUTH DAKOTA

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
  1000 PM MDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE 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

SUMMARY...SUPERCELL STORMS ERUPTING ACROSS EASTERN MT AT PRESENT
WILL CONTINUE TO INCREASE IN COVERAGE AND INTENSITY AS LARGE SCALE
ASCENT SPREADS EAST FROM THE NORTHERN ROCKIES AND AIDS LEE-SIDE
CYCLONE DEVELOPMENT. STORMS MAY EVENTUALLY CONGEAL INTO A MORE
EXTENSIVE BOW ECHO ACROSS THE DAKOTAS THROUGH LATE EVENING WHERE
DAMAGING WINDS AND LARGE HAIL WILL LIKELY CONTINUE AFTER DARK.
TORNADO POTENTIAL EXISTS IN THE INITIAL AND TRANSITORY STAGES
...ESPECIALLY ACROSS THE INSTABILITY AXIS OVER WESTERN NORTH
DAKOTA...GIVEN STRENGTHENING LOW AND DEEP-LAYER SHEAR IN THE
PRESENCE OF HIGHER BOUNDARY LAYER RH.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 165 STATUTE
MILES EAST AND WEST OF A LINE FROM 75 MILES NORTHWEST OF MINOT
NORTH DAKOTA TO 35 MILES WEST SOUTHWEST OF LEMMON SOUTH DAKOTA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 322...WW 323...

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 28035.


...CARBIN

Tornado Watches in North Dakota, 2015Tornado Watches in Montana, 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.