Alert archive / Montana / Special Weather Statements in 2017
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at May 6, 2017, 2:07 PM MDT for Deer Lodge County, Montana. It was in force for 23 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
- May 6, 2017, 2:07 PM MDT (20:07 UTC)
- Expired
- May 6, 2017, 2:30 PM MDT
- In force
- 23 min
- Issued by
- NWS Missoula, MT
County Deer Lodge County, MT
The radar
The Missoula radar (KMSX), 115 km from the middle of the area, began a volume at 20:11 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, 8.1 hours before the alert went out and 271 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1696 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 166 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 May 6, 4:00 AM MDT, 10 hours 7 minutes earlier.
Area forecast discussion, May 6, 4:00 AM MDT, 10 hours 7 minutes before
Area Forecast Discussion National Weather Service Missoula MT 400 AM MDT Sat May 6 2017 .DISCUSSION...Scattered rain showers will continue this morning across western Montana and central Idaho. A brief break will be possible around mid day today before the next round of showers and thunderstorms moves in this afternoon. The focus for thunderstorms this afternoon will be over southwest Montana, Lemhi county of Idaho and parts of west-central Montana. The main threats will be small hail and gusty winds with wind gusts of 50 mph possible. An isolated severe storm will be possible with the best chances over Lemhi county and southwest Montana near the Continental Divide. A cold front will move through the region this afternoon/evening and temperatures in most locations will run 5 to 10 degrees below seasonal averages on Sunday. Showery conditions will persist on Sunday especially over the higher terrain near the Continental Divide. For the first half of next week, the forecast dries out and temperatures will be on the increase again, reaching widespread 70s by Wednesday. The warm temperatures will again increase the rate of snowmelt in the terrain, so expect streams to be running high and swiftly through the week. Showers and thunderstorms are back in the forecast by Thursday and Friday of next week, as a trough of low pressure pushes into the West Coast. && .AVIATION...Showers will decrease this morning giving area terminals a break after 12Z. This afternoon a cold front will move through the region causing another round of thunderstorms and showers. Storm motion is expected to be 30-40 knots, so any impacts from storms at area terminals will be short lived. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. &&
In the hours before
Special weather statement, May 6, 12:11 PM MDT, 1 hour 56 minutes before
Special Weather Statement National Weather Service Missoula MT 1211 PM MDT SAT MAY 6 2017 IDZ009-010-MTZ006-061900- Eastern Lemhi County ID-Western Lemhi County ID- Bitterroot/Sapphire Mountains MT- 1211 PM MDT SAT MAY 6 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LEMHI AND SOUTHWESTERN RAVALLI COUNTIES UNTIL 100 PM MDT... At 1210 PM MDT, Doppler radar was tracking a strong thunderstorm 28 miles southwest of North Fork, or 29 miles west of Salmon, moving northeast at 35 mph. Pea size hail, heavy rain, and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Shoup. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 4509 11438 4517 11464 4572 11440 4557 11393 TIME...MOT...LOC 1810Z 203DEG 32KT 4521 11451
Special weather statement, May 6, 12:55 PM MDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Missoula MT
1255 PM MDT SAT MAY 6 2017
IDZ009-010-MTZ005-006-061945-
Eastern Lemhi County ID-Western Lemhi County ID-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
1255 PM MDT SAT MAY 6 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL LEMHI AND
SOUTHEASTERN RAVALLI COUNTIES UNTIL 145 PM MDT...
At 1254 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles northwest of North Fork, or 29 miles northwest of Salmon,
moving northeast at 35 mph.
Dime size hail, brief heavy rain, and winds in excess of 40 mph will
be possible with this storm.
Locations impacted include...
Conner, Sula and Lost Trail Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4584 11370 4575 11383 4578 11387 4576 11390
4570 11391 4570 11393 4568 11394 4564 11390
4562 11390 4562 11388 4540 11418 4549 11440
4603 11410 4584 11362
TIME...MOT...LOC 1854Z 210DEG 32KT 4552 11424Special weather statement, May 6, 2:07 PM MDT, 0 minutes before
Special Weather Statement National Weather Service Missoula MT 207 PM MDT SAT MAY 6 2017 MTZ006-007-062030- Bitterroot/Sapphire Mountains MT-Butte/Blackfoot Region MT- 207 PM MDT SAT MAY 6 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DEER LODGE... SOUTHERN GRANITE AND EAST CENTRAL RAVALLI COUNTIES UNTIL 230 PM MDT... At 206 PM MDT, trained weather spotters reported a strong thunderstorm 23 miles east of Conner, or 29 miles southeast of Hamilton, moving northeast at 35 mph. Half inch hail and winds in excess of 40 mph have been reported with this storm. Locations impacted include... Georgetown and Porters Corner. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 4589 11362 4602 11381 4636 11341 4613 11308 TIME...MOT...LOC 2006Z 224DEG 32KT 4601 11364
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 6:34 PM MDT | Special Weather Statement | MSO | Deer Lodge | 71 min |
| May 5, 6:57 PM MDT | Special Weather Statement | MSO | Missoula | 48 min |
| May 5, 7:39 PM MDT | Special Weather Statement | MSO | Sanders | 51 min |
| May 5, 7:52 PM MDT | Special Weather Statement | MSO | Lincoln | 68 min |
| May 6, 12:11 PM MDT | Special Weather Statement | MSO | 49 min | |
| May 6, 12:55 PM MDT | Special Weather Statement | MSO | Ravalli | 50 min |
| May 6, 1:26 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 34 min |
| May 6, 2:22 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite | 23 min |
| May 6, 2:31 PM MDT | Special Weather Statement | MSO | Silver Bow | 44 min |
| May 6, 2:42 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite | 33 min |
| May 6, 3:16 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 29 min |
| May 6, 3:41 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 34 min |
| May 5, 6:28 PM MDT | Special Weather Statement | MSO | Clearwater | 47 min |
Nearby
Special Weather Statements in Montana, 2017Every special weather statement in 2017
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.