Severe Thunderstorm Watch 352

Issued

Jun 4, 2012, 1:46 PM MDT (19:46 UTC)

Expired

Jun 4, 2012, 11:49 PM MDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Spokane radar (KOTX), 186 km from the middle of the area, began a volume at 19:49 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

5%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1051Jun 4, 12:49 PM MDT
• Mesoscale Discussion 1057Jun 4, 4:45 PM MDT
• Mesoscale Discussion 1059Jun 4, 5:28 PM MDT
• Mesoscale Discussion 1062Jun 4, 7:42 PM MDT
• Mesoscale Discussion 1065Jun 4, 10:08 PM MDT

843 
WWUS20 KWNS 041949
SEL2
SPC WW 041949
IDZ000-MTZ000-ORZ000-WAZ000-050700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 352
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM PDT MON JUN 4 2012

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

       MUCH OF IDAHO
       WESTERN MONTANA
       EASTERN OREGON
       EASTERN WASHINGTON

EFFECTIVE THIS MONDAY FROM 1245 PM UNTIL MIDNIGHT PDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHWEST OF
KALISPELL MONTANA TO 55 MILES SOUTHEAST OF ROME OREGON.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 351...

DISCUSSION...POTENT MID/UPR LEVEL DISTURBANCE AND 70-100KT MID LEVEL
SPEED MAX CURRENTLY CROSSING NRN CA WILL TRANSLATE NEWD ACROSS PARTS
OF OR/WA/ID THROUGH LATE TONIGHT. RESULTING DYNAMIC LIFT WITH THIS
IMPULSE WILL ACT TO ENHANCE CONVECTIVE DEVELOPMENT ALONG A
WELL-ESTABLISHED AND STRENGTHENING N-S BAROCLINIC ZONE SITUATED
ACROSS ERN OR/WA. ORGANIZED FAST-MOVING TSTMS IN THE FORM OF
SUPERCELLS AND/OR LONGER-LIVED LINE SEGMENTS SHOULD EVOLVE AS
GREATER FORCING COINCIDES WITH STRONGER DIURNAL DESTABILIZATION
ACROSS THE REGION OVER THE NEXT SEVERAL HOURS. SOME OF THE MORE
ROBUST/ORGANIZED ELEMENTS OF CONVECTION COULD PRODUCE SEVERE HAIL
WHILE MOST OF THE STORMS MOVE NNEWD AT SPEEDS OF 50-60KT AND POSE A
THREAT OF DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM
MOTION VECTOR 19050.


...CARBIN

Severe Thunderstorm Watches in Idaho, 2012Severe Thunderstorm Watches in Montana, 2012Severe Thunderstorm Watches in Washington, 2012Every severe thunderstorm 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.