Tornado Watch 360

Issued

Jun 5, 2012, 2:37 PM MDT (20:37 UTC)

Expired

Jun 5, 2012, 11:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

65 kt

Counties Blaine County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Glacier County, MT, Hill County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Liberty County, MT, Pondera County, MT, Teton County, MT, Toole County, MT

The Great Falls radar (KTFX), 12 km from the middle of the area, began a volume at 20:39 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

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

60%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1074Jun 5, 1:56 PM MDT
• Mesoscale Discussion 1077Jun 5, 4:48 PM MDT
• Mesoscale Discussion 1079Jun 5, 6:07 PM MDT
• Mesoscale Discussion 1081Jun 5, 8:08 PM MDT
• Mesoscale Discussion 1082Jun 5, 9:49 PM MDT

126 
WWUS20 KWNS 052040
SEL0
SPC WW 052040
MTZ000-060500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 360
NWS STORM PREDICTION CENTER NORMAN OK
235 PM MDT TUE JUN 5 2012

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

       NORTH-CENTRAL AND CENTRAL MONTANA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1100 PM MDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES SOUTH SOUTHEAST OF
GREAT FALLS MONTANA TO 65 MILES EAST NORTHEAST OF CUT BANK
MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 358...WW 359...

DISCUSSION...MIGRATORY SURFACE LOW NEAR LVM WILL DEVELOP NWD ALONG
N-S ORIENTED WARM FRONT TO VICINITY OF HVR BY LATE EVENING.  AIR
MASS ALONG THIS BOUNDARY IS QUITE MOIST GIVEN THE ELEVATION WITH
DEWPOINTS IN THE MID 50S-LOWER 60S.  WHEN COUPLED WITH STEEP
MIDLEVEL LAPSE RATES...ENVIRONMENT IS MODERATELY UNSTABLE WITH
MLCAPE OF 1000-2000 J/KG AND A DECREASING CAP.  EXPECT TSTMS TO
INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON INTO EVENING IN
RESPONSE TO APPROACH OF NEGATIVELY TILTED MIDLEVEL TROUGH.  FORECAST
HODOGRAPHS ALONG THE WARM FRONT DEPICT SIZABLE LOW- AND DEEP-LAYER
SHEAR WHICH WILL SUPPORT SUPERCELLS CAPABLE OF A FEW TORNADOES...IN
ADDITION TO VERY LARGE HAIL AND DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 17035.


...MEAD

Tornado Watches in Montana, 2012Every tornado watch in 2012

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.