Alert archive / Montana / Special Weather Statements in 2016
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Jun 7, 2016, 2:46 PM MDT for Powell County, Montana. It was in force for 44 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, 2:46 PM MDT (20:46 UTC)
- Expired
- Jun 7, 2016, 3:30 PM MDT
- In force
- 44 min
- Issued by
- NWS Missoula, MT
County Powell County, MT
The radar
The Missoula radar (KMSX), 102 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 201 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.
- 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
The text
As transmitted.
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</html>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, 2:27 PM MDT, 19 minutes earlier.
Area forecast discussion, Jun 7, 2:27 PM MDT, 19 minutes before
Area Forecast Discussion
National Weather Service Missoula MT
227 PM MDT TUE JUN 7 2016
.DISCUSSION...A very moist and unstable atmosphere will continue
to impact SW Montana from roughly Missoula south and east to the
Continental Divide this afternoon into early evening. Lots of day
time heating from the Bitterroot Valley eastward will further help
enhance of few of the storms and possibly produce rain rates sufficient
for significant local runoff or brief flooding. We have received
reports so far this afternoon of up to half inch of rain in ten
minutes...and the strongest storms probably have yet to develop.
Again, the extreme rain rates and any flash flooding should be
very localized.
Late tonight, another area of moisture/instability may shift over
north central Idaho supporting a few light showers from Riggins to
Grangeville and Orofino.
There are a few notable weather impacts on Wednesday. First, the
hottest day of the week and near record heat is expected in some
areas of western Montana. It will also be quite warm in
Grangeville and Orofino. Second...strong storms with isolated severe
storms are expected during the afternoon and evening. Hail and
strong winds are the primary threat.
A cold front will shift across the area Wednesday night and
deliver cooler air to the region. Showers and thunderstorms are
expected to continue, especially across north central Idaho and northwest
Montana.
A southwest flow and weak disturbances may continue to impact the
northern Rockies Thursday. This should translate into a few
showers and possible scattered thunderstorms, but mainly Lemhi
County and southwest Montana. The stronger southwest flow aloft
should also produce breezy conditions at times, especially in the
afternoon and evening.
The trough of low pressure in the upper atmosphere is expected to
sharpen/strengthen over the Pacific Northwest on Friday and shift
eastward across north central Idaho and Western Montana by
Saturday. This feature should direct additional moisture over the
region and support a relatively unstable atmosphere. The end
result should be showers and thunderstorms and very
breezy...cooler conditions for most areas.
&&
.AVIATION...A very moist and unstable atmosphere will continue to
impact southwest Montana from roughly the Bitterroots eastward
across the Continental Divide this evening. This will translate
into scattered thunderstorms with local strong gusty winds and
brief heavy rain. KBTM should be airport mostly impacted. A few
showers may also shift over north central Idaho near Grangeville
and Orofino towards early Wednesday morning.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Flash Flood Watch from Wednesday afternoon through Wednesday
evening Butte/Blackfoot Region.
ID...None.
&&In the hours before
Special weather statement, Jun 7, 1:38 PM MDT, 1 hour 8 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, 59 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, 0 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
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, 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, 3:45 PM MDT | Special Weather Statement | MSO | Powell | 30 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, 2016Every 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.