Alert archive / Idaho / High Wind Watches in 2021

High Wind Watch 6, NWS Missoula, MT

December 9, 2021Clearwater County, Idaho County, Idaho

NWS Missoula, MT issued this high wind watch at Dec 9, 2021, 12:36 PM PST for Clearwater County, Idaho County, Idaho. It took effect at Dec 11, 2021, 7:00 AM PST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 9, 2021, 12:36 PM PST (20:36 UTC)
In effect from
Dec 11, 2021, 7:00 AM PST
Expired
Dec 10, 2021, 1:45 PM PST
In force
Issued by
NWS Missoula, MT

Counties Clearwater County, ID, Idaho County, ID

The radar

The Missoula radar (KMSX), 148 km from the middle of the area, began a volume at 20:39 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 172 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.

Skew-T log-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 2021-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2021-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1095 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

617 
WWUS75 KMSO 092036
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
136 PM MST Thu Dec 9 2021

IDZ007-110245-
/O.NEW.KMSO.HW.A.0006.211211T1500Z-211212T0300Z/
Orofino/Grangeville Region-
1236 PM PST Thu Dec 9 2021

...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...South winds 30 to 40 mph with gusts up to 60 mph 
  possible.

* WHERE...Camas Prairie, Grangeville and vicinity.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Damaging winds could blow down trees and power 
  lines. Widespread power outages are possible. Travel could be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$
1 follow-up statement
785 
WWUS75 KMSO 102145
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
245 PM MST Fri Dec 10 2021

IDZ007-102245-
/O.CAN.KMSO.HW.A.0006.211211T1500Z-211212T0300Z/
Orofino/Grangeville Region-
145 PM PST Fri Dec 10 2021

...HIGH WIND WATCH IS CANCELLED...

Winds will be gusty and accompanied by snow across the Camas
Prairie throughout Saturday.

$$

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 9, 2:12 AM PSTWinter Weather AdvisoryMSOClearwater, Idaho30 hr

Nearby

High Wind Watches in Idaho, 2021Every high wind watch 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.