Severe Thunderstorm Watch 239

Issued

Jun 9, 2016, 1:01 PM MDT (19:01 UTC)

Expired

Jun 9, 2016, 10:00 PM MDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Glasgow radar (KGGW), 80 km from the middle of the area, began a volume at 19:00 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

20%

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

30%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 847Jun 9, 11:44 AM MDT
• Mesoscale Discussion 848Jun 9, 1:48 PM MDT
• Mesoscale Discussion 852Jun 9, 2:51 PM MDT
• Mesoscale Discussion 855Jun 9, 6:05 PM MDT
• Mesoscale Discussion 858Jun 9, 9:25 PM MDT

214 
WWUS20 KWNS 091859
SEL9  
SPC WW 091859
MTZ000-100400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 239
NWS STORM PREDICTION CENTER NORMAN OK
100 PM MDT THU JUN 9 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  CENTRAL AND EASTERN MONTANA

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
  1000 PM MDT.

* PRIMARY THREATS INCLUDE...
  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER
    POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  A TORNADO OR TWO POSSIBLE

SUMMARY...STORMS DEVELOPING OVER THE HIGHER TERRAIN OF WESTERN
MONTANA WILL EVOLVE INTO SUPERCELLS AND BOWING SEGMENTS...POSING A
THREAT FOR VERY LARGE HAIL...DAMAGING WIND AND A COUPLE OF TORNADOES
AS THEY SPREAD THROUGH CENTRAL AND EASTERN MONTANA THIS AFTERNOON
AND EVENING.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH
NORTHEAST OF SIDNEY MONTANA TO 35 MILES NORTHWEST OF BOZEMAN
MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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.

&&

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 24035.


...DIAL

Severe Thunderstorm Watches in Montana, 2016Every severe thunderstorm watch in 2016

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.