Alert archive / Idaho / Wind Advisories in 2021

Wind Advisory 7, NWS Missoula, MT

August 7, 2021Lemhi County, Idaho

NWS Missoula, MT issued this wind advisory at Aug 7, 2021, 1:10 PM MDT for Lemhi County, Idaho. It took effect at Aug 8, 2021, 12:00 PM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Aug 7, 2021, 1:10 PM MDT (19:10 UTC)
In effect from
Aug 8, 2021, 12:00 PM MDT
Expired
Aug 8, 2021, 7:40 PM MDT
In force
8 hr
Issued by
NWS Missoula, MT

County Lemhi County, ID

The radar

The Pocatello radar (KSFX), 227 km from the middle of the area, began a volume at 19:09 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

Boise Airport, ID (KBOI), launched 12:00Z, 7.2 hours before the alert went out and 236 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, Boise Airport, ID at 12:00Z on 2021-08-07Temperature 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, Boise Airport, ID at 12:00Z on 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939Sfc1 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
2096 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

794 
WWUS75 KMSO 071910
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
110 PM MDT Sat Aug 7 2021

IDZ009-010-090300-
/O.NEW.KMSO.WI.Y.0007.210808T1800Z-210809T0300Z/
Western Lemhi County-Eastern Lemhi County-
110 PM MDT Sat Aug 7 2021

...WIND ADVISORY IN EFFECT FROM NOON TO 9 PM MDT SUNDAY...

* WHAT...West winds 15 to 25 mph with gusts 40-50 mph expected. 
  Stronger winds possible with thunderstorms.

* WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, 
  Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and 
  Salmon.

* WHEN...From noon to 9 PM MDT Sunday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
1 follow-up statement
299 
WWUS75 KMSO 090140
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
740 PM MDT Sun Aug 8 2021

IDZ009-010-090245-
/O.CAN.KMSO.WI.Y.0007.000000T0000Z-210809T0300Z/
Western Lemhi County-Eastern Lemhi County-
740 PM MDT Sun Aug 8 2021

...WIND ADVISORY IS CANCELLED...

The cold front driven winds have subsided and thus the Wind
Advisory will be cancelled early.

$$

Nearby

Wind Advisories in Idaho, 2021Every 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.