Alert archive / Washington / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Spokane, WA

July 7, 2021Stevens County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Jul 7, 2021, 6:59 PM PDT for Stevens County, Washington. It was in force for 46 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: Jul 7, 2021, 6:59 PM PDT (01:59 UTC)
Expired: Jul 7, 2021, 7:45 PM PDT
In force: 46 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Stevens County, WA

The radar

The Spokane radar (KOTX), 125 km from the middle of the area, began a volume at 01:59 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, 2.0 hours before the alert went out and 164 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: 10 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 3130 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

976 
WUUS56 KOTX 080159
SVROTX
WAC065-080245-
/O.NEW.KOTX.SV.W.0006.210708T0159Z-210708T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Spokane WA
659 PM PDT Wed Jul 7 2021

The National Weather Service in Spokane has issued a

* Severe Thunderstorm Warning for...
  North central Stevens County in northeastern Washington...

* Until 745 PM PDT.

* At 658 PM PDT, a severe thunderstorm was located 16 miles north of
  Colville, moving east at 25 mph.

  HAZARD...Quarter size hail. Wind gusts up to 50 MPH.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will remain over mainly rural areas of
  north central Stevens County, including Highway 25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4874 11806 4880 11807 4891 11766 4876 11763
TIME...MOT...LOC 0158Z 264DEG 23KT 4878 11796 

HAIL...1.00IN
WIND...<50MPH
 
$$

JW

2 follow-up statements

574 
WWUS56 KOTX 080223
SVSOTX

Severe Weather Statement
National Weather Service Spokane WA
723 PM PDT Wed Jul 7 2021

WAC065-080245-
/O.CON.KOTX.SV.W.0006.000000T0000Z-210708T0245Z/
Stevens WA-
723 PM PDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM PDT
FOR NORTH CENTRAL STEVENS COUNTY...

At 722 PM PDT, a severe thunderstorm was located 18 miles north of
Colville, moving east at 25 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of north
central Stevens County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4875 11785 4881 11788 4888 11767 4876 11763
TIME...MOT...LOC 0222Z 263DEG 22KT 4879 11776 

HAIL...1.00IN
WIND...<50MPH
 
$$

JW

564 
WWUS56 KOTX 080240
SVSOTX

Severe Weather Statement
National Weather Service Spokane WA
740 PM PDT Wed Jul 7 2021

WAC065-080250-
/O.EXP.KOTX.SV.W.0006.000000T0000Z-210708T0245Z/
Stevens WA-
740 PM PDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL STEVENS COUNTY
WILL EXPIRE AT 745 PM PDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 4875 11785 4881 11788 4888 11767 4876 11763
TIME...MOT...LOC 0240Z 264DEG 23KT 4880 11764 

$$

JW

Nearby

Severe Thunderstorm Warnings in Washington, 2021 Every severe thunderstorm warning 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.