Alert archive / Montana / Lake Wind Advisories in 2021
Lake Wind Advisory 4, NWS Missoula, MT
NWS Missoula, MT issued this lake wind advisory at May 17, 2021, 2:36 PM MDT for Flathead County, Lake County, Sanders County, Montana. It took effect at May 18, 2021, 3:00 PM MDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- May 17, 2021, 2:36 PM MDT (20:36 UTC)
- In effect from
- May 18, 2021, 3:00 PM MDT
- Expired
- May 18, 2021, 9:00 PM MDT
- In force
- 6 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 20:38 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, 8.6 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
- 29 J/kg
- Mixed-layer CIN
- -894 J/kg
- Mixed-layer LCL
- 2689 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
417 WWUS75 KMSO 172036 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 236 PM MDT Mon May 17 2021 MTZ003-182045- /O.NEW.KMSO.LW.Y.0004.210518T2100Z-210519T0300Z/ Flathead/Mission Valleys- 236 PM MDT Mon May 17 2021 ...LAKE WIND ADVISORY IN EFFECT FROM 3 PM TO 9 PM MDT TUESDAY FOR FLATHEAD LAKE... * WHAT...Waves 1 to 3 feet with west winds 20 to 25 mph with gusts up to 35 mph expected on Flathead Lake. * WHERE...Flathead/Mission Valleys. * WHEN...From 3 PM 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. && $$
1 follow-up statement
791 WWUS75 KMSO 190246 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 846 PM MDT Tue May 18 2021 MTZ003-190400- /O.EXP.KMSO.LW.Y.0004.000000T0000Z-210519T0300Z/ Flathead/Mission Valleys- 846 PM MDT Tue May 18 2021 ...LAKE WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING FOR FLATHEAD LAKE... $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 2:40 PM MDT | Winter Storm Watch | MSO | Flathead, Lake | 24 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.