Tornado Watch 435

Issued

Jun 6, 2011, 5:46 PM MDT (23:46 UTC)

Expired

Jun 7, 2011, 1:00 AM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

Counties Big Horn County, MT, Carbon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT

The Billings radar (KBLX), 100 km from the middle of the area, began a volume at 23:50 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

40%

One or more EF2 to EF5 tornadoes

20%

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

50%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1113Jun 6, 2:13 PM MDT
• Mesoscale Discussion 1116Jun 6, 4:45 PM MDT
• Mesoscale Discussion 1119Jun 6, 8:25 PM MDT
• Mesoscale Discussion 1121Jun 6, 10:25 PM MDT

684 
WWUS20 KWNS 062346
SEL5
SPC WW 062346
MTZ000-070700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 435
NWS STORM PREDICTION CENTER NORMAN OK
545 PM MDT MON JUN 6 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       CENTRAL MONTANA

EFFECTIVE THIS MONDAY AFTERNOON AND TUESDAY MORNING FROM 545 PM
UNTIL 100 AM MDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 85 MILES NORTHEAST OF
LEWISTOWN MONTANA TO 55 MILES SOUTH OF BILLINGS MONTANA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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 433...WW 434...

DISCUSSION...CONSIDERABLE STRENGTHENING OF FORCING FOR ASCENT AND
DEEP-LAYER WIND FIELD IS FORECAST IN THE 07/00-03Z TIME
FRAME...SUPPORTING A MARKED INCREASE IN STORM COVERAGE AND
INTENSITY.  THE PRESENCE OF BOUNDARY LAYER DEWPOINTS IN THE
50S...STEEP LAPSE RATES AND PRONOUNCED VEERING OF WINDS WITH HEIGHT
WILL FOSTER AN ENVIRONMENT FAVORABLE FOR SUPERCELLS CAPABLE OF LARGE
HAIL AND A FEW TORNADOES.

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 21030.


...MEAD

Tornado Watches in Montana, 2011Every tornado watch in 2011

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.