Alert archive / Washington / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 18, NWS Spokane, WA

July 7, 2012Garfield County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Jul 7, 2012, 6:52 PM PDT for Garfield County, Washington. It was in force for 38 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, 2012, 6:52 PM PDT (01:52 UTC)
Expired
Jul 7, 2012, 7:30 PM PDT
In force
38 min
Issued by
NWS Spokane, WA
Area
Storm-based polygon

County Garfield County, WA

The radar

The Spokane radar (KOTX), 130 km from the middle of the area, began a volume at 01:55 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, 1.9 hours before the alert went out and 161 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 00:00Z on 2012-07-08Temperature 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 00:00Z on 2012-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
3675 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

842 
WUUS56 KOTX 080152
SVROTX
WAC023-080230-
/O.NEW.KOTX.SV.W.0018.120708T0152Z-120708T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
652 PM PDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GARFIELD COUNTY IN SOUTHEAST WASHINGTON...

* UNTIL 730 PM PDT

* AT 650 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 12
  MILES SOUTH OF POMEROY...OR 31 MILES WEST OF CLARKSTON...AND MOVING
  NORTH AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  POMEROY...DODGE AND MAYVIEW

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4624 11762 4633 11762 4634 11768 4646 11774
      4648 11787 4663 11785 4662 11780 4670 11774
      4669 11764 4668 11762 4668 11744 4665 11738
      4661 11738 4657 11732 4623 11754
TIME...MOT...LOC 0152Z 191DEG 25KT 4632 11768

$$

VAN HORN
2 follow-up statements
032 
WWUS56 KOTX 080223
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
723 PM PDT SAT JUL 7 2012

WAC023-080230-
/O.CON.KOTX.SV.W.0018.000000T0000Z-120708T0230Z/
GARFIELD WA-
723 PM PDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM PDT
FOR NORTHWESTERN GARFIELD COUNTY...

AT 719 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED OVER NORTHWESTERN GARFIELD COUNTY...OR 28 MILES WEST OF
PULLMAN...MOVING NORTH AT 45 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4653 11785 4663 11785 4662 11780 4670 11774
      4669 11764 4668 11762 4668 11756 4667 11750
      4651 11760
TIME...MOT...LOC 0223Z 192DEG 40KT 4664 11771

$$

VAN HORN
703 
WWUS56 KOTX 080230
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
730 PM PDT SAT JUL 7 2012

WAC023-080240-
/O.EXP.KOTX.SV.W.0018.000000T0000Z-120708T0230Z/
GARFIELD WA-
730 PM PDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GARFIELD COUNTY
HAS EXPIRED...

DOPPLER RADAR INDICATED THE STORM WAS NO LONGER SEVERE AND THE
WARNING WAS ALLOWED TO EXPIRE. 

LAT...LON 4653 11785 4663 11785 4662 11780 4670 11774
      4669 11764 4668 11762 4668 11756 4667 11750
      4651 11760
TIME...MOT...LOC 0230Z 192DEG 40KT 4672 11768

$$

KELCH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 6:04 PM PDTSpecial Weather StatementOTXAsotin26 min
Jul 7, 7:27 PM PDTSevere Thunderstorm WarningOTXWhitman33 min
Jul 7, 7:59 PM PDTSevere Thunderstorm WarningOTXWhitman21 min
Jul 8, 6:34 AM PDTRed Flag WarningOTX40 hr

Nearby

Severe Thunderstorm Warnings in Washington, 2012Every severe thunderstorm warning in 2012

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.