Alert archive / Montana / Winter Storm Watches in 2017
Winter Storm Watch 7, NWS Missoula, MT
NWS Missoula, MT issued this winter storm watch at Sep 12, 2017, 2:03 PM MDT for 7 counties in Montana; Lemhi County, Idaho. It took effect at Sep 14, 2017, 9:00 PM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Sep 12, 2017, 2:03 PM MDT (20:03 UTC)
- In effect from
- Sep 14, 2017, 9:00 PM MDT
- Expired
- Sep 14, 2017, 9:29 AM MDT
- In force
- Issued by
- NWS Missoula, MT
Counties Lemhi County, ID, Deer Lodge County, MT, Granite County, MT, Lake County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 83 km from the middle of the area, began a volume at 20:06 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 253 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
- 3806 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch 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 winter storm watch went out at Sep 11, 2:50 PM MDT, 23 hours 13 minutes earlier.
Area forecast discussion, Sep 11, 2:50 PM MDT, 23 hours 13 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 |
|---|---|---|---|---|
| Sep 12, 2:02 PM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Lewis and Clark, Madison and 4 more | 29 hr |
Nearby
Winter Storm Watches in Montana, 2017Winter Storm Watches in Idaho, 2017Every winter storm watch 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.