Alert archive / Montana / Lake Wind Advisories in 2021
Lake Wind Advisory 2, NWS Missoula, MT
NWS Missoula, MT issued this lake wind advisory at Apr 11, 2021, 1:25 PM MDT for Flathead County, Lake County, Sanders County, Montana. It took effect at Apr 12, 2021, 2:00 PM MDT. It was in force for 31 hr.
The area
The counties it named.
The facts
- Issued
- Apr 11, 2021, 1:25 PM MDT (19:25 UTC)
- In effect from
- Apr 12, 2021, 2:00 PM MDT
- Expired
- Apr 13, 2021, 9:00 PM MDT
- In force
- 31 hr
- Issued by
- NWS Missoula, MT
Counties Flathead County, MT, Lake County, MT, Sanders County, MT
The radar
The Missoula radar (KMSX), 98 km from the middle of the area, began a volume at 19:24 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
Spokane, WA (KOTX), launched 12:00Z, 7.4 hours before the alert went out and 149 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
- 2148 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
700 WWUS75 KMSO 111925 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 125 PM MDT Sun Apr 11 2021 MTZ003-121930- /O.NEW.KMSO.LW.Y.0002.210412T2000Z-210414T0300Z/ Flathead/Mission Valleys- 125 PM MDT Sun Apr 11 2021 ...LAKE WIND ADVISORY IN EFFECT FROM 2 PM MONDAY TO 9 PM MDT TUESDAY... * WHAT...Waves 1 to 3 feet with northeast winds 15 to 25 mph with gusts up to 35 mph expected. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 2 PM Monday to 9 PM MDT Tuesday. * IMPACTS...Strong winds and rough waves will create hazardous conditions for small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft. && $$
1 follow-up statement
524 WWUS75 KMSO 140318 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 918 PM MDT Tue Apr 13 2021 MTZ003-140430- /O.EXP.KMSO.LW.Y.0002.000000T0000Z-210414T0300Z/ Flathead/Mission Valleys- 918 PM MDT Tue Apr 13 2021 ...LAKE WIND ADVISORY HAS EXPIRED... Gusty winds will continue tomorrow, but gusts are expected to remain below 30 mph with predominant winds below 20 mph. Conditions will still be windy on Flathead Lake though. $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 9:08 PM MDT | Special Weather Statement | MSO | Powell | 37 min |
Nearby
Lake Wind Advisories in Montana, 2021Every lake wind advisory in 2021
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.