Alert archive / Montana / Lake Wind Advisories in 2021
Lake Wind Advisory 3, NWS Missoula, MT
NWS Missoula, MT issued this lake wind advisory at Apr 21, 2021, 12:54 PM MDT for Flathead County, Lake County, Sanders County, Montana. It took effect at Apr 22, 2021, 11:00 AM MDT. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2021, 12:54 PM MDT (18:54 UTC)
- In effect from
- Apr 22, 2021, 11:00 AM MDT
- Expired
- Apr 22, 2021, 2:01 PM MDT
- In force
- 3 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 18:55 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, 6.9 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
- 2403 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
904 WWUS75 KMSO 211854 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 1254 PM MDT Wed Apr 21 2021 MTZ003-221900- /O.NEW.KMSO.LW.Y.0003.210422T1500Z-210423T0000Z/ Flathead/Mission Valleys- 1254 PM MDT Wed Apr 21 2021 ...LAKE WIND ADVISORY IN EFFECT FROM 9 AM TO 6 PM MDT THURSDAY FOR FLATHEAD LAKE... * WHAT...A strong cold front will bring north to east winds of 15 to 25 mph with gusts 30 to 40 mph developing by late morning and continuing into the afternoon. These winds will generate waves between 1 to 2 feet. * WHERE...Flathead Lake. * WHEN...From 9 AM to 6 PM MDT Thursday. * 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. && $$
2 follow-up statements
434 WWUS75 KMSO 221310 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 710 AM MDT Thu Apr 22 2021 MTZ003-230000- /O.EXT.KMSO.LW.Y.0003.210422T1700Z-210423T0000Z/ Flathead/Mission Valleys- 710 AM MDT Thu Apr 22 2021 ...LAKE WIND ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MDT THIS EVENING FOR FLATHEAD LAKE... * WHAT...A strong cold front will bring north to east winds of 15 to 25 mph with gusts 30 to 40 mph and continuing into the afternoon. These winds will generate waves between 1 to 2 feet. * WHERE...Flathead Lake. * WHEN...From 11 AM this morning to 6 PM MDT this evening. * IMPACTS...Strong winds and rough waves will create hazardous conditions for small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft. && $$
106 WWUS75 KMSO 222001 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 201 PM MDT Thu Apr 22 2021 MTZ003-222115- /O.CAN.KMSO.LW.Y.0003.000000T0000Z-210423T0000Z/ Flathead/Mission Valleys- 201 PM MDT Thu Apr 22 2021 ...LAKE WIND ADVISORY IS CANCELLED... The constant rain has stabilized the atmosphere, therefore lessening the wind potential. Northerly winds between 10 and 20 mph are still expected over the lake for the remainder of the afternoon. $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 12:54 PM MDT | Winter Weather Advisory | MSO | Flathead, Lake | 29 hr |
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.