Alert archive / Washington / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 28, NWS Spokane, WA

July 16, 2012Whitman County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Jul 16, 2012, 7:28 PM PDT for Whitman County, Washington. It was in force for 47 min. 2 reports 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 16, 2012, 7:28 PM PDT (02:28 UTC)
Expired: Jul 16, 2012, 8:15 PM PDT
In force: 47 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

County Whitman County, WA

The radar

The Spokane radar (KOTX), 61 km from the middle of the area, began a volume at 02:28 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 16, 7:37 PM PDT	HAIL 0.5	2 N Steptoe, WA	HALF INCH HAIL ALONG WITH NEAR ZERO VISIBILITY IN HEAVY RAIN.
Jul 16, 7:52 PM PDT	HAIL 0.75	2 S St. John, WA

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, 2.5 hours before the alert went out and 118 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: 594 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 2101 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 81 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.

095 
WUUS56 KOTX 170228
SVROTX
WAC075-170315-
/O.NEW.KOTX.SV.W.0028.120717T0228Z-120717T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
728 PM PDT MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN WHITMAN COUNTY IN EASTERN WASHINGTON...

* UNTIL 815 PM PDT

* AT 723 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...  
  AND DAMAGING WINDS UP TO 50 MPH.  THIS STORM WAS LOCATED   
  NEAR THORNTON...OR 25 MILES NORTHWEST OF PULLMAN...AND MOVING      
  WEST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MALDEN...PINE CITY...ST. JOHN...EWEN AND LAMONT

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 4700 11796 4724 11797 4726 11795 4726 11769
      4721 11721 4697 11731
TIME...MOT...LOC 0228Z 098DEG 27KT 4707 11742

$$

FX

3 follow-up statements

110 
WWUS56 KOTX 170247
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
747 PM PDT MON JUL 16 2012

WAC075-170315-
/O.CON.KOTX.SV.W.0028.000000T0000Z-120717T0315Z/
WHITMAN WA-
747 PM PDT MON JUL 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM PDT
FOR NORTH CENTRAL WHITMAN COUNTY...

AT 742 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL.  THIS STORM WAS LOCATED NEAR ST. JOHN...OR 27 MILES SOUTH OF
CHENEY...MOVING WEST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EWEN
AND LAMONT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A LINE OF WINDS AHEAD OF THE RAIN AND LIGHTING WITH 
GUSTS TO 35-40 MPH POSSIBLE.  DO NOT WAIT FOR THE SOUND OF THUNDER 
BEFORE TAKING COVER. 

&&

LAT...LON 4698 11748 4698 11763 4699 11765 4700 11796
      4724 11796 4724 11797 4726 11795 4726 11769
      4723 11736 4722 11735 4697 11745
TIME...MOT...LOC 0246Z 100DEG 27KT 4710 11762

$$

FX

029 
WWUS56 KOTX 170305
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
805 PM PDT MON JUL 16 2012

WAC075-170315-
/O.CON.KOTX.SV.W.0028.000000T0000Z-120717T0315Z/
WHITMAN WA-
805 PM PDT MON JUL 16 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM PDT
FOR NORTH CENTRAL WHITMAN COUNTY...

AT 800 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR EWEN...OR 27 MILES SOUTH OF
CHENEY...MOVING WEST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAMONT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A LINE OF WINDS AHEAD OF THE RAIN AND LIGHTING WITH 
GUSTS TO 35-40 MPH POSSIBLE.  DO NOT WAIT FOR THE SOUND OF THUNDER 
BEFORE TAKING COVER. 




&&

LAT...LON 4698 11748 4698 11763 4699 11765 4700 11796
      4724 11796 4724 11797 4726 11795 4726 11769
      4723 11736 4722 11735 4697 11745
TIME...MOT...LOC 0305Z 100DEG 27KT 4712 11783

$$

FX

435 
WWUS56 KOTX 170318
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
818 PM PDT MON JUL 16 2012

WAC075-170327-
/O.EXP.KOTX.SV.W.0028.000000T0000Z-120717T0315Z/
WHITMAN WA-
818 PM PDT MON JUL 16 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WHITMAN COUNTY
HAS EXPIRED...

DOPPLER RADAR INDICATED THE STORM HAS WEAKENED BELOW SEVERE LEVELS 
HOWEVER IT STILL COULD PRODUCE PENNY-SIZED HAIL AND WIND GUSTS TO 40 
MPH.  

LAT...LON 4698 11748 4698 11763 4699 11765 4700 11796
      4724 11796 4724 11797 4726 11795 4726 11769
      4723 11736 4722 11735 4697 11745
TIME...MOT...LOC 0305Z 100DEG 27KT 4712 11783

$$

FX

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 6:45 PM PDT	Special Weather Statement	OTX	Spokane	45 min
Jul 16, 7:21 PM PDT	Special Weather Statement	OTX	Spokane	9 min
Jul 16, 8:26 PM PDT	Special Weather Statement	OTX	Lincoln	49 min
Jul 16, 9:03 PM PDT	Special Weather Statement	OTX	Adams	72 min
Jul 17, 2:24 AM PDT	Areal Flood Advisory	OTX	Chelan, Douglas, Grant, Okanogan	4 hr
Jul 17, 6:35 AM PDT	Areal Flood Advisory	OTX	Ferry, Lincoln, Okanogan, Spokane, Stevens	6 hr
Jul 17, 2:56 PM PDT	Special Weather Statement	OTX	Garfield	34 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.