Alert archive / Montana / Special Weather Statements in 2016

Special Weather Statement, NWS Missoula, MT

June 7, 2016Powell County, Montana

NWS Missoula, MT issued this special weather statement at Jun 7, 2016, 3:45 PM MDT for Powell County, Montana. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 7, 2016, 3:45 PM MDT (21:45 UTC)
Expired: Jun 7, 2016, 4:15 PM MDT
In force: 30 min
Issued by: NWS Missoula, MT

County Powell County, MT

The radar

The Missoula radar (KMSX), 108 km from the middle of the area, began a volume at 21:48 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 nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.8 hours before the alert went out and 194 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 289 J/kg
Mixed-layer CIN: -276 J/kg
Mixed-layer LCL: 2258 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 7, 3:14 PM MDT, 31 minutes earlier.

Area forecast discussion, Jun 7, 3:14 PM MDT, 31 minutes before

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In the hours before

Special weather statement, Jun 7, 1:38 PM MDT, 2 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
138 PM MDT TUE JUN 7 2016

MTZ004-072000-
LOWER CLARK FORK REGION MT-
138 PM MDT TUE JUN 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MISSOULA COUNTY UNTIL 200
PM MDT...

AT 137 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
ALBERTON...OR 23 MILES NORTHWEST OF MISSOULA...MOVING EAST AT 15 MPH.

PEA SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
FRENCHTOWN AND HUSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4704 11444 4709 11443 4708 11427 4701 11430
TIME...MOT...LOC 1937Z 275DEG 12KT 4706 11440

Special weather statement, Jun 7, 1:47 PM MDT, 1 hour 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
147 PM MDT TUE JUN 7 2016

MTZ006-007-043-072045-
POTOMAC/SEELEY LAKE REGION MT-BITTERROOT/SAPPHIRE MOUNTAINS MT-
BUTTE/BLACKFOOT REGION MT-
147 PM MDT TUE JUN 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL GRANITE COUNTY
UNTIL 245 PM MDT...

AT 146 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12
MILES WEST OF DRUMMOND...MOVING NORTHEAST AT 5 MPH. HEAVY RAIN COULD
PRODUCE ROCKS ALONG FRONTAGE ROAD IN THE VICINITY OF BEARMOUTH AS
WELL AS PONDING OF WATER AND REDUCED VISIBILITY ON INTERSTATE 90.

LOCATIONS IMPACTED INCLUDE...
BEARMOUTH AND NIMROD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4659 11335 4662 11353 4675 11346 4671 11319
TIME...MOT...LOC 1946Z 212DEG 5KT 4666 11341

Special weather statement, Jun 7, 2:46 PM MDT, 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
246 PM MDT TUE JUN 7 2016

MTZ007-072130-
BUTTE/BLACKFOOT REGION MT-
246 PM MDT TUE JUN 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL POWELL COUNTY UNTIL
330 PM MDT...

AT 245 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GARRISON...OR 13 MILES SOUTHEAST OF DRUMMOND...MOVING NORTHEAST AT 5
MPH. THESE STORMS WILL PRODUCE PONDING AND REDUCED VISIBILITY ALONG
I-90 BETWEEN GARRISON JUNCTION AND GOLD CREEK, OR 15-20 MILES
EAST OF DRUMMOND.

LOCATIONS IMPACTED INCLUDE...
GARRISON...BROCK CREEK AND GOLDCREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4646 11285 4654 11302 4666 11295 4653 11268
TIME...MOT...LOC 2045Z 222DEG 5KT 4655 11291

Special weather statement, Jun 7, 3:17 PM MDT, 28 minutes before

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Special weather statement, Jun 7, 3:45 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 7:33 PM MDT	Special Weather Statement	MSO	Ravalli	42 min
Jun 6, 8:44 PM MDT	Special Weather Statement	MSO	Ravalli	31 min
Jun 7, 1:38 PM MDT	Special Weather Statement	MSO	Missoula	22 min
Jun 7, 1:47 PM MDT	Special Weather Statement	MSO	Granite	58 min
Jun 7, 2:07 PM MDT	Flash Flood Watch	MSO	Deer Lodge, Granite, Powell, Silver Bow	60 min
Jun 7, 2:46 PM MDT	Special Weather Statement	MSO	Powell	44 min
Jun 7, 3:07 PM MDT	Flash Flood Watch	MSO	Deer Lodge, Granite, Powell, Silver Bow	4 hr
Jun 7, 3:17 PM MDT	Special Weather Statement	MSO	Silver Bow	13 min
Jun 7, 3:28 PM MDT	Areal Flood Advisory	MSO	Silver Bow	62 min
Jun 7, 4:17 PM MDT	Special Weather Statement	MSO	Lake	28 min
Jun 7, 5:48 PM MDT	Areal Flood Advisory	MSO	Silver Bow	57 min

Nearby

Special Weather Statements in Montana, 2016 Every special weather statement in 2016

Sources

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.