Alert archive / Montana / Special Weather Statements in 2017
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Jul 9, 2017, 8:37 PM MDT for Deer Lodge County, Montana. It was in force for 38 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
- Jul 9, 2017, 8:37 PM MDT (02:37 UTC)
- Expired
- Jul 9, 2017, 9:15 PM MDT
- In force
- 38 min
- Issued by
- NWS Missoula, MT
County Deer Lodge County, MT
The radar
The Missoula radar (KMSX), 111 km from the middle of the area, began a volume at 02:37 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 00:00Z, 2.6 hours before the alert went out and 239 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
- 56 J/kg
- Mixed-layer CIN
- -199 J/kg
- Mixed-layer LCL
- 3424 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 240 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 Jul 9, 2:37 PM MDT, 6 hours earlier.
Area forecast discussion, Jul 9, 2:37 PM MDT, 6 hours before
Area Forecast Discussion National Weather Service Missoula MT 237 PM MDT Sun Jul 9 2017 .DISCUSSION...The ridge axis has shifted slightly to the east today putting the Northern Rockies more under a southwesterly flow pattern. A plume of moisture has traversed under the ridge and is interacting with an unstable atmosphere from Lemhi county into southwest Montana. This interaction will allow for the development of fairly strong thunderstorms. Due to the extremely dry low levels, the main threat will be gusty and potentially damaging winds. Temperatures today will once again be hot, but should not quite reach daily record levels. A weak disturbance will be moving through the Pacific Northwest tonight into Monday. This feature will knock down the ridge causing the upper level flow to become more westerly. A weak cold front associated with the disturbance will cool temperatures to seasonal readings. The front appears to become the focal point for convection during the afternoon/evening hours across southwest Montana. The westerly flow persists into Tuesday with temperatures remaining near normal. Then the models are depicting another extraordinary ridge of high pressure building over the region for the remainder of the work week into the weekend. Temperatures appear to be in the upper 90s to low 100s by Thursday through at least Sunday. && .AVIATION...Scattered showers and thunderstorms are developing across Lemhi county into southwest Montana this afternoon. KBTM and KSMN will be impacted gusty winds and potentially brief heavy rain between 09/21z-10/00z. The convection will diminish after sunset this evening. On Monday, westerly winds will be on the increase during the afternoon with a few showers and thunderstorms along the Divide. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. &&
In the hours before
Special weather statement, Jul 9, 5:49 PM MDT, 2 hours 48 minutes before
Special Weather Statement National Weather Service Missoula MT 549 PM MDT SUN JUL 9 2017 MTZ006-007-100015- Bitterroot/Sapphire Mountains MT-Butte/Blackfoot Region MT- 549 PM MDT SUN JUL 9 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GRANITE AND SOUTH CENTRAL POWELL COUNTIES UNTIL 615 PM MDT... At 549 PM MDT, Doppler radar was tracking a strong thunderstorm near Drummond, moving east at 35 mph. Pea size hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Drummond, Garrison, Maxville, Jens, Brock Creek, New Chicago, Goldcreek and Hall. 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 4645 11334 4666 11337 4681 11286 4645 11277 TIME...MOT...LOC 2349Z 260DEG 30KT 4658 11321
Special weather statement, Jul 9, 6:14 PM MDT, 2 hours 23 minutes before
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</html>Special weather statement, Jul 9, 6:46 PM MDT, 1 hour 51 minutes before
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</html>Special weather statement, Jul 9, 7:06 PM MDT, 1 hour 31 minutes before
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</html>Special weather statement, Jul 9, 7:46 PM MDT, 51 minutes before
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</html>Special weather statement, Jul 9, 8:37 PM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 6:14 PM MDT | Special Weather Statement | MSO | Powell | 46 min |
| Jul 9, 6:46 PM MDT | Special Weather Statement | MSO | Powell | 44 min |
| Jul 9, 7:06 PM MDT | Special Weather Statement | MSO | Ravalli | 39 min |
| Jul 9, 7:46 PM MDT | Special Weather Statement | MSO | Ravalli | 44 min |
| Jul 9, 9:34 PM MDT | Special Weather Statement | MSO | 41 min | |
| Jul 9, 10:17 PM MDT | Special Weather Statement | MSO | Ravalli | 43 min |
| Jul 10, 1:29 PM MDT | Special Weather Statement | MSO | Silver Bow | 46 min |
| Jul 10, 3:12 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 33 min |
| Jul 10, 3:40 PM MDT | Special Weather Statement | MSO | Deer Lodge | 35 min |
| Jul 10, 4:12 PM MDT | Special Weather Statement | MSO | Deer Lodge | 33 min |
| Jul 10, 4:16 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Powell, Silver Bow | 29 min |
| Jul 10, 4:20 PM MDT | Special Weather Statement | MSO | Silver Bow | 25 min |
| Jul 10, 4:22 PM MDT | Severe Thunderstorm Warning | MSO | Silver Bow | 23 min |
| Jul 10, 4:51 PM MDT | Special Weather Statement | MSO | Deer Lodge | 24 min |
| Jul 10, 5:04 PM MDT | Special Weather Statement | MSO | Ravalli | 26 min |
| Jul 10, 5:38 PM MDT | Special Weather Statement | MSO | Powell | 37 min |
| Jul 10, 5:45 PM MDT | Special Weather Statement | MSO | Granite | 45 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.