Alert archive / Montana / Winter Storm Warnings in 2018
Winter Storm Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this winter storm warning at Oct 1, 2018, 2:49 PM MDT for Flathead County, Lake County, Montana. It took effect at Oct 2, 2018, 3:00 AM MDT. It was in force for 30 hr. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Oct 1, 2018, 2:49 PM MDT (20:49 UTC)
- In effect from
- Oct 2, 2018, 3:00 AM MDT
- Expired
- Oct 3, 2018, 8:59 AM MDT
- In force
- 30 hr
- Issued by
- NWS Missoula, MT
Counties Flathead County, MT, Lake County, MT
The radar
The Missoula radar (KMSX), 104 km from the middle of the area, began a volume at 20:53 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 2, 1:00 PM MDT | SNOW 6 | 5 Ene Blacktail, MT | SNOW BEGAN BETWEEN 5-6 AM MDT. |
| Oct 3, 8:00 AM MDT | SNOW 1.5 | 9 Wnw Apgar, MT | BIG CREEK ALONG THE NORTH FORK ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 8.8 hours before the alert went out and 177 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
- 1475 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
920 WWUS45 KMSO 012049 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 249 PM MDT Mon Oct 1 2018 MTZ002-031100- /O.NEW.KMSO.WS.W.0013.181002T0900Z-181003T1800Z/ West Glacier Region- 249 PM MDT Mon Oct 1 2018 ...WINTER STORM WARNING IN EFFECT FROM 3 AM TUESDAY TO NOON MDT WEDNESDAY ABOVE 5000 FEET... * WHAT...Heavy snow expected. Total snow accumulations below 4000 feet 1 to 3 inches, above 5000 feet 5 to 8 inches, with localized amounts up to 18-22 inches above 6500 feet, are expected. * WHERE...West Glacier Region. * WHEN...From 3 AM Tuesday to noon MDT Wednesday. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Be prepared for significant reductions in visibility at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
2 follow-up statements
344 WWUS45 KMSO 022033 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 233 PM MDT Tue Oct 2 2018 MTZ002-031800- /O.CON.KMSO.WS.W.0013.000000T0000Z-181003T1800Z/ West Glacier Region- 233 PM MDT Tue Oct 2 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT WEDNESDAY ABOVE 4000 FEET... * WHAT...Heavy snow above 4000 feet. Total snow accumulations below 4000: feet 1 to 3 inches, above 5000 feet: around 6 inches has already fallen, with an additional 4 to 7 inches expected by early morning. Localized amounts up to 18-22 inches above 6500 feet are expected. * WHERE...West Glacier Region including Marias Pass. * WHEN...Until noon MDT Wednesday. * ADDITIONAL DETAILS...Travel could be very difficult. Gusty winds could bring down tree branches and create very low visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
797 WWUS45 KMSO 031459 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 859 AM MDT Wed Oct 3 2018 MTZ002-031600- /O.CAN.KMSO.WS.W.0013.000000T0000Z-181003T1800Z/ West Glacier Region- 859 AM MDT Wed Oct 3 2018 ...WINTER STORM WARNING IS CANCELLED... Higher elevations of Glacier National Park could pick up an additional half to one inch of snow. Generally across the area however there will be no further accumulation. $$
Nearby
Winter Storm Warnings in Montana, 2018Every winter storm warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.