Alert archive / Washington / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 25, NWS Spokane, WA

July 15, 2012Asotin County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Jul 15, 2012, 6:26 PM PDT for Asotin County, Washington. It was in force for 29 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 15, 2012, 6:26 PM PDT (01:26 UTC)
Expired: Jul 15, 2012, 6:55 PM PDT
In force: 29 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

County Asotin County, WA

The radar

The Pendleton radar (KPDT), 146 km from the middle of the area, began a volume at 01:27 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.

What was reported inside it

Time	Report	Where	Remark
Jul 15, 6:30 PM PDT	HAIL 0.75	7 Sw Anatone, WA	REPORTED BY FIELDS SPRING STATE PARK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 1.4 hours before the alert went out and 176 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: 379 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1448 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

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

481 
WUUS56 KOTX 160126
SVROTX
WAC003-160215-
/O.NEW.KOTX.SV.W.0025.120716T0126Z-120716T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
626 PM PDT SUN JUL 15 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

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

* UNTIL 715 PM PDT

* AT 622 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR ANATONE...OR 22 MILES SOUTHWEST OF
  LEWISTON...AND MOVING NORTH AT 12 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ANATONE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL ALSO PRODUCE EXTREMELY HEAVY RAINFALL. IF DRIVING
THROUGH THE STORM REDUCE YOUR SPEED TO LOWER THE RISK OF
HYDROPLANING. ALSO BE PREPARED FOR PONDING OF WATER IN LOW LYING
AREAS.

&&

LAT...LON 4604 11733 4637 11724 4631 11699 4629 11698
      4628 11699 4624 11696 4599 11708
TIME...MOT...LOC 0126Z 197DEG 9KT 4611 11717

$$

KELCH

2 follow-up statements

739 
WWUS56 KOTX 160145
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
645 PM PDT SUN JUL 15 2012

WAC003-160215-
/O.CON.KOTX.SV.W.0025.000000T0000Z-120716T0215Z/
ASOTIN WA-
645 PM PDT SUN JUL 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM PDT
FOR CENTRAL ASOTIN COUNTY...

AT 643 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR ANATONE...OR 18 MILES SOUTHWEST OF
LEWISTON...MOVING NORTH AT 10 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL ALSO PRODUCE EXTREMELY HEAVY RAINFALL. IF DRIVING
THROUGH THE STORM REDUCE YOUR SPEED TO LOWER THE RISK OF
HYDROPLANING. ALSO BE PREPARED FOR PONDING OF WATER IN LOW LYING
AREAS.

&&

LAT...LON 4613 11727 4637 11724 4632 11702 4630 11698
      4628 11699 4624 11696 4609 11705
TIME...MOT...LOC 0144Z 197DEG 9KT 4615 11715

$$

KELCH

625 
WWUS56 KOTX 160155
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
655 PM PDT SUN JUL 15 2012

WAC003-160203-
/O.CAN.KOTX.SV.W.0025.000000T0000Z-120716T0215Z/
ASOTIN WA-
655 PM PDT SUN JUL 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ASOTIN COUNTY IS
CANCELLED...

THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. 

LAT...LON 4613 11727 4637 11724 4632 11702 4630 11698
      4628 11699 4624 11696 4609 11705
TIME...MOT...LOC 0153Z 197DEG 9KT 4617 11714

$$

KELCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 6:08 PM PDT	Special Weather Statement	OTX	Ferry	52 min
Jul 15, 6:23 PM PDT	Areal Flood Advisory	OTX	Ferry, Okanogan, Stevens	3 hr
Jul 16, 12:52 AM PDT	Special Weather Statement	OTX	Whitman	38 min
Jul 16, 1:19 AM PDT	Severe Thunderstorm Warning	OTX	Adams, Whitman	41 min

Nearby

Severe Thunderstorm Warnings in Washington, 2012 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.