Alert archive / Idaho / Special Weather Statements in 2021

Special Weather Statement, NWS Spokane, WA

August 5, 2021Lewis County, Idaho

NWS Spokane, WA issued this special weather statement at Aug 5, 2021, 7:17 PM PDT for Lewis County, Idaho. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 5, 2021, 7:17 PM PDT (02:17 UTC)
Expired: Aug 5, 2021, 8:15 PM PDT
In force: 58 min
Issued by: NWS Spokane, WA
Hail: 0.75 in
Wind: 40

County Lewis County, ID

The radar

The Pendleton radar (KPDT), 177 km from the middle of the area, began a volume at 02:17 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 00:00Z, 2.3 hours before the alert went out and 185 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2910 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

184 
WWUS86 KOTX 060217
SPSOTX

Special Weather Statement
National Weather Service Spokane WA
717 PM PDT Thu Aug 5 2021
 
IDZ027-060315-
Lewis and Southern Nez Perce Counties ID-
717 PM PDT Thu Aug 5 2021

...A strong thunderstorm will impact portions of south central Nez
Perce and southwestern Lewis Counties through 815 PM PDT...

At 715 PM PDT, Doppler radar was tracking a strong thunderstorm 20
miles north of Imnaha, or 30 miles west of Grangeville, moving north
at 30 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Craigmont and Winchester. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Heavy rainfall is also occurring with this storm and may lead to 
localized flooding or ponding of water on roads. Do not drive your 
vehicle through flooded roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4590 11685 4628 11670 4625 11634 4619 11639
      4620 11643 4612 11648 4612 11651 4600 11653
      4604 11664 4599 11665 4600 11669 4596 11675
      4589 11673 4586 11679
TIME...MOT...LOC 0215Z 196DEG 25KT 4585 11674 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$

COTE

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 3:41 PM PDT	Dust Storm Advisory	OTX	Adams	2 hr
Aug 5, 8:12 PM PDT	Special Weather Statement	OTX	Lewis, Nez Perce	78 min

Nearby

Special Weather Statements in Idaho, 2021 Every special weather statement 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.