Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 30, NWS Spokane, WA

July 17, 2012Lewis County, Nez Perce County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 17, 2012, 7:14 PM PDT for Lewis County, Nez Perce County, Idaho. It was in force for 45 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 17, 2012, 7:14 PM PDT (02:14 UTC)
Expired: Jul 17, 2012, 7:59 PM PDT
In force: 45 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Lewis County, ID, Nez Perce County, ID

The radar

The Spokane radar (KOTX), 160 km from the middle of the area, began a volume at 02:16 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 17, 7:25 PM PDT	HAIL 0.88	2 S Culdesac, ID	LOTS OF HAIL AND RAIN FELL WITH NEAR ZERO VISIBILITIES ALONG THE WINCHESTER GRADE
Jul 17, 7:30 PM PDT	TSTM WND GST 59	6 S Culdesac, ID	GUST REPORTED AT CORRAL CREEK RAWS. OCCURRED BETWEEN 701-801PM

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, 2.2 hours before the alert went out and 141 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: 449 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

945 
WUUS56 KOTX 180214
SVROTX
IDC061-069-180300-
/O.NEW.KOTX.SV.W.0030.120718T0214Z-120718T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
714 PM PDT TUE JUL 17 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LEWIS COUNTY IN NORTH CENTRAL IDAHO...
  NEZ PERCE COUNTY IN NORTH CENTRAL IDAHO...

* UNTIL 800 PM PDT

* AT 712 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  STRONG WINDS IN EXCESS OF 40 MPH.  THIS STORM WAS LOCATED NEAR
  WAHA...OR 16 MILES SOUTHEAST OF LEWISTON...AND MOVING NORTHEAST AT
  30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WINCHESTER...LAPWAI...CULDESAC...CRAIGMONT...REUBENS...GIFFORD...
  MOHLER...LENORE...PECK...SOUTHWICK AND SPALDING

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 4623 11694 4654 11677 4654 11673 4660 11668
      4663 11663 4663 11644 4651 11644 4651 11638
      4642 11630 4642 11620 4628 11611 4609 11677
TIME...MOT...LOC 0213Z 229DEG 26KT 4624 11673

$$

VAN HORN

4 follow-up statements

622 
WWUS56 KOTX 180234
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
734 PM PDT TUE JUL 17 2012

IDC061-069-180300-
/O.CON.KOTX.SV.W.0030.000000T0000Z-120718T0300Z/
LEWIS ID-NEZ PERCE ID-
734 PM PDT TUE JUL 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM PDT
FOR NORTHEASTERN NEZ PERCE AND NORTHERN LEWIS COUNTIES...

AT 729 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND STRONG WINDS IN EXCESS OF 40 MPH.  THIS STORM WAS
LOCATED NEAR REUBENS...OR 19 MILES EAST OF LEWISTON...MOVING 
NORTHEAST AT 30 MPH. THIS STORM WILL TRACK ACROSS HIGHWAY 95 BETWEEN 
MILE MARKER 290 AND 291.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GIFFORD...MOHLER...LENORE...PECK...SOUTHWICK AND SPALDING.

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 4619 11672 4632 11683 4654 11677 4655 11671
      4660 11668 4663 11663 4663 11644 4651 11644
      4651 11638 4642 11630 4642 11620 4632 11614
TIME...MOT...LOC 0233Z 229DEG 26KT 4633 11657

$$

VAN HORN

227 
WWUS56 KOTX 180236 CCA
SVSOTX

SEVERE WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE SPOKANE WA
736 PM PDT TUE JUL 17 2012

IDC061-069-180300-
/O.CON.KOTX.SV.W.0030.000000T0000Z-120718T0300Z/
LEWIS ID-NEZ PERCE ID-
736 PM PDT TUE JUL 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM PDT
FOR NORTHEASTERN NEZ PERCE AND NORTHERN LEWIS COUNTIES...

AT 729 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND STRONG WINDS IN EXCESS OF 40 MPH.  THIS STORM WAS
LOCATED NEAR REUBENS...OR 19 MILES EAST OF LEWISTON...MOVING 
NORTHEAST AT 30 MPH. THIS STORM WILL TRACK ACROSS HIGHWAY 95 BETWEEN 
MILE MARKER 281 AND 290.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
GIFFORD...MOHLER...LENORE...PECK...SOUTHWICK AND SPALDING.

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 4619 11672 4632 11683 4654 11677 4655 11671
      4660 11668 4663 11663 4663 11644 4651 11644
      4651 11638 4642 11630 4642 11620 4632 11614
TIME...MOT...LOC 0233Z 229DEG 26KT 4633 11657

$$

VAN HORN

903 
WWUS56 KOTX 180251
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
751 PM PDT TUE JUL 17 2012

IDC061-069-180300-
/O.CON.KOTX.SV.W.0030.000000T0000Z-120718T0300Z/
LEWIS ID-NEZ PERCE ID-
751 PM PDT TUE JUL 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM PDT
FOR NORTHEASTERN NEZ PERCE AND NORTH CENTRAL LEWIS COUNTIES...

AT 746 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND STRONG WINDS IN EXCESS OF 40 MPH.  THIS STORM WAS
LOCATED NEAR GIFFORD...OR 14 MILES SOUTHWEST OF OROFINO...MOVING
NORTHEAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LENORE...SOUTHWICK...SPALDING AND PECK.

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 4629 11656 4643 11672 4663 11644 4651 11644
      4651 11638 4642 11630 4642 11620 4641 11619
TIME...MOT...LOC 0250Z 232DEG 27KT 4642 11650

$$

VAN HORN

915 
WWUS56 KOTX 180259
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
759 PM PDT TUE JUL 17 2012

IDC061-069-180306-
/O.CAN.KOTX.SV.W.0030.000000T0000Z-120718T0300Z/
LEWIS ID-NEZ PERCE ID-
759 PM PDT TUE JUL 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEZ PERCE AND 
NORTH CENTRAL LEWIS COUNTIES IS CANCELLED. THE STORM HAS WEAKENED 
ENDING THE THREAT FOR SEVERE HAIL. HEAVY RAIN AND GUSTY WINDS UP TO 
40 MPH IS EXPECTED TO CONTINUE WITH THIS STORM WITH HAIL SMALLER 
THAN THE SIZE OF PENNYS AS IT PASSES THROUGH GIFFORD AND PECK...

LAT...LON 4629 11656 4643 11672 4663 11644 4651 11644
      4651 11638 4642 11630 4642 11620 4641 11619
TIME...MOT...LOC 0256Z 232DEG 21KT 4642 11641

$$

VAN HORN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 6:32 PM PDT	Severe Thunderstorm Warning	OTX	Lewis, Nez Perce	43 min

Nearby

Severe Thunderstorm Warnings in Idaho, 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.