Alert archive / Montana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 17, NWS Missoula, MT

July 1, 2010Powell County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 1, 2010, 3:13 PM MDT for Powell County, Montana. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 1, 2010, 3:13 PM MDT (21:13 UTC)
Expired: Jul 1, 2010, 3:29 PM MDT
In force: 16 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

County Powell County, MT

The radar

The Missoula radar (KMSX), 82 km from the middle of the area, began a volume at 21:17 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 1, 1:37 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 1:58 PM MDT, 1 hour 15 minutes earlier.

Area forecast discussion, Jul 1, 1:58 PM MDT, 1 hour 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
158 PM MDT THU JUL 1 2010

.DISCUSSION...ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED THIS
AFTERNOON AND EVENING ACROSS LEMHI COUNTY THROUGH SOUTHWEST
MONTANA. THE BOUNDARY FOR THE BEST POTENTIAL OF CONVECTION HAS
SHIFTED A LITTLE WESTWARD OVER THE ABOVE AREAS. MORNING UPPER AIR
SOUNDINGS ALSO SHOWED VERY FAVORABLE CONDITIONS SUCH AS LOW LEVEL
SHEAR, LIFT AND SUFFICIENT LOW LEVEL MOISTURE. THESE CONDITIONS MAY
ALSO BE FAVORABLE FOR A SEVERE THUNDERSTORM OR TWO WITH THE MAIN
IMPACT THE POTENTIAL FOR LARGE HAIL.

STORMS SHOULD DIE OFF LATER THIS EVENING. THE LARGE UPPER LOW
RESPONSIBLE FOR THE SOUTHWEST FLOW AND CONVECTION OVER THE REGION
WILL MOVE INLAND AND OVER THE NORTHERN ROCKIES ON FRIDAY. MODELS
INDICATE AMPLE MOISTURE WITH THIS SYSTEM AND POTENTIALLY MAY
PRODUCE SIGNIFICANT PRECIPITATION IN NORTHWEST MONTANA. THE OTHER
BIG IMPACT WILL BE MUCH COOLER TEMPERATURES. EXPECT TEMPERATURES
TO BE 10-15 DEGREES BELOW NORMAL FRIDAY AND SATURDAY. CONDITIONS
WILL DRY OUT A BIT SATURDAY WITH SCATTERED AFTERNOON SHOWERS EXPECTED.

4TH OF JULY SUNDAY...THE TROF WILL MOVE EAST OF THE REGION AND
LEAVE THE NORTHERN ROCKIES IN A WESTERLY FLOW. WINDS ALOFT ARE
EXPECTED TO BE STRONG AND SHOULD MIX TO THE SURFACE IN THE
AFTERNOON HOURS. THE MAIN AREA FOR STRONGER WINDS WILL BE IN
NORTHWEST MONTANA. FLATHEAD LAKE SHOULD SEE BREEZY CONDITIONS
SUNDAY.

A BROAD TROUGH OF LOW PRESSURE OVER CENTRAL CANADA WILL KEEP WESTERN
MONTANA AND CENTRAL IDAHO UNDER NORTHWESTERLY FLOW ALOFT THROUGH MID
WEEK. THIS WILL LEAD TO A GRADUAL WARMING TREND WITH TEMPERATURES
WORKING THEIR WAY BACK TOWARDS NORMAL TO SLIGHTLY ABOVE NORMAL. AFTER
MID WEEK THE MODELS BECOME A BIT INCONSISTENT. BUT MOST MODELS
MAINTAIN A SIMILAR NATIONAL SYNOPTIC SET UP WITH A STRONG HIGH
PRESSURE RIDGE OVER THE DEEP SOUTH...ANOTHER HIGH AMPLITUDE RIDGE
OVER THE EASTERN PACIFIC OCEAN AND A LARGE TROUGH OVER CENTRAL
CANADA. GIVEN THIS SET UP WE SHOULD ANTICIPATE RISING HEIGHTS THROUGH
THE REST OF THE WEEK WHICH WILL LEAD TEMPERATURES AROUND 5-7 DEGREES
ABOVE NORMAL. IN ADDITION...FORECAST MODELS SUGGEST A GRADUAL
INCREASE IN LOW AND MID LEVEL MOISTURE MOVING UP THROUGH UTAH AND
COLORADO WHICH MAY LEAD TO AN INCREASING CHANCE FOR THUNDERSTORMS
BY LATE NEXT WEEK.

&&

.AVIATION... THE TROUGH OF LOW PRESSURE ALONG THE WEST COAST WILL
INCREASE CLOUDS AND SHOWER ACTIVITY OVER PORTIONS OF WESTERN
MONTANA AND LEMHI COUNTY IDAHO TODAY. CONVECTIVE ACTIVITY WILL BE
SIMILAR TO WHAT WAS EXPERIENCED ON WEDNESDAY...WITH THE GREATEST
THUNDERSTORM THREAT ACROSS SOUTHWEST MONTANA AND LEMHI COUNTY...
IMPACTING KBTM AND KSMN TERMINALS THIS AFTERNOON THROUGH EARLY
EVENING. THE POTENTIAL FOR THUNDERSTORMS DECREASES CONSIDERABLY AS
ONE HEADS NORTH INTO NORTHWEST MONTANA.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...NONE.
ID...NONE.
&&

SHORT TERM...RPN
LONG TERM....DICKERSON
AVIATION...PALLISTER

Hazardous weather outlook, Jul 1, 10:22 AM MDT, 4 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MISSOULA MT
1022 AM MDT THU JUL 1 2010

IDZ009-010-MTZ006-007-043-012000-
WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY-
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
POTOMAC/SEELEY LAKE REGION-
1022 AM MDT THU JUL 1 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO AND WEST CENTRAL MONTANA.

.DAY ONE...TODAY AND TONIGHT

STRONG SOUTHWESTERLY FLOW ALOFT AND A SURGE OF PACIFIC MOISTURE
WILL COMBINE WITH AN UNSTABLE ATMOSPHERE TO INCREASE THE THREAT OF
SEVERE THUNDERSTORMS DURING THIS AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS CURRENTLY EXPECTED.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Special weather statement, Jul 1, 1:09 PM MDT, 2 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
109 PM MDT THU JUL 1 2010

MTZ007-0119405-
BUTTE/BLACKFOOT REGION-
109 PM MDT THU JUL 1 2010

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN DEER LODGE AND SILVER BOW
COUNTIES UNTIL 140 PM MDT...

AT 100 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GREGSON HOT SPRINGS...OR 11 MILES SOUTHEAST
OF ANACONDA...MOVING NORTHEAST AT 25 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...BUTTE...GREGSON HOT
SPRINGS...SILVER BOW...WALKERVILLE...CRACKERVILLE...RAMSAY...
OPPORTUNITY...NISSLER...NEWCOMB AND JANNEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4569 11267 4601 11299 4621 11270 4606 11245
      4603 11245 4602 11243 4598 11242 4593 11242
      4589 11239 4584 11242 4580 11237
TIME...MOT...LOC 1907Z 225DEG 20KT 4601 11280

Special weather statement, Jul 1, 1:23 PM MDT, 1 hour 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
123 PM MDT THU JUL 1 2010

MTZ007-012015-
BUTTE/BLACKFOOT REGION-
123 PM MDT THU JUL 1 2010

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DEER LODGE AND
SILVER BOW COUNTIES UNTIL 215 PM MDT...

AT 118 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 9 MILES NORTH OF WALKERVILLE...OR 11 MILES NORTH
OF BUTTE...MOVING NORTHEAST AT 40 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE....

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4578 11275 4597 11314 4622 11267 4627 11256
      4624 11255 4623 11257 4619 11256 4618 11250
      4613 11249 4608 11245 4598 11242 4592 11242
TIME...MOT...LOC 1923Z 221DEG 35KT 4620 11250

Special weather statement, Jul 1, 2:15 PM MDT, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
215 PM MDT THU JUL 1 2010

MTZ007-012100-
BUTTE/BLACKFOOT REGION-
215 PM MDT THU JUL 1 2010

...SIGNIFICANT WEATHER ADVISORY FOR DEER LODGE AND SILVER BOW
COUNTIES UNTIL 300 PM MDT...

AT 206 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES SOUTH OF BUTTE...MOVING NORTHEAST AT 35
MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE....BUTTE...WALKERVILLE
AND RAMSEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
THURSDAY EVENING FOR EAST CENTRAL IDAHO AND WEST CENTRAL MONTANA.

&&

LAT...LON 4573 11249 4568 11253 4561 11270 4577 11282
      4580 11299 4587 11309 4586 11319 4578 11335
      4586 11346 4587 11346 4614 11311 4627 11255
      4619 11256 4618 11250 4589 11239 4584 11242
      4573 11218
TIME...MOT...LOC 2012Z 226DEG 29KT 4636 11223

Special weather statement, Jul 1, 2:30 PM MDT, 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
230 PM MDT THU JUL 1 2010

MTZ006-007-012115-
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
230 PM MDT THU JUL 1 2010

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN POWELL AND EASTERN
GRANITE COUNTIES UNTIL 315 PM MDT...

AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 12 MILES EAST OF PHILIPSBURG...OR 16 MILES WEST
OF DEER LODGE...MOVING NORTHEAST AT 35 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...DEER LODGE...
GARRISON...JENS...GOLDCREEK...BROCK CREEK...AVON...FINN...ELLISTON
AND BLOSSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
THURSDAY EVENING FOR EAST CENTRAL IDAHO AND WEST CENTRAL MONTANA.

&&

LAT...LON 4625 11311 4623 11352 4684 11271 4684 11255
      4683 11253 4670 11252 4670 11242 4666 11240
      4666 11233 4662 11228 4653 11229
TIME...MOT...LOC 2030Z 227DEG 30KT 4641 11301

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 8:11 PM MDT	Special Weather Statement	MSO	Powell	49 min
Jun 30, 8:14 PM MDT	Special Weather Statement	MSO	Granite	46 min
Jun 30, 8:25 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Granite, Powell	50 min
Jun 30, 9:14 PM MDT	Severe Thunderstorm Warning	MSO	Powell	31 min
Jul 1, 1:23 PM MDT	Special Weather Statement	MSO	Silver Bow	52 min
Jul 1, 2:15 PM MDT	Special Weather Statement	MSO	Deer Lodge, Silver Bow	45 min
Jul 1, 2:30 PM MDT	Special Weather Statement	MSO	Powell	45 min
Jul 1, 3:16 PM MDT	Severe Thunderstorm Warning	MSO	Silver Bow	15 min
Jul 1, 3:38 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Silver Bow	22 min
Jul 1, 4:22 PM MDT	Special Weather Statement	MSO	Silver Bow	23 min

Nearby

Severe Thunderstorm Warnings in Montana, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.