Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 35, NWS Spokane, WA

July 20, 20124 counties in Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 20, 2012, 1:18 PM PDT for 4 counties in Idaho. It was in force for 42 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 20, 2012, 1:18 PM PDT (20:18 UTC)
Expired: Jul 20, 2012, 2:00 PM PDT
In force: 42 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Benewah County, ID, Latah County, ID, Nez Perce County, ID, Shoshone County, ID

The radar

The Spokane radar (KOTX), 142 km from the middle of the area, began a volume at 20:20 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 20, 1:40 PM PDT	HAIL 1	3 N Kendrick, ID

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 11:38 AM PDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 8.3 hours before the alert went out and 102 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2619 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 66 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.

151 
WUUS56 KOTX 202018
SVROTX
IDC009-057-069-079-202100-
/O.NEW.KOTX.SV.W.0035.120720T2018Z-120720T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
118 PM PDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEZ PERCE COUNTY IN NORTH CENTRAL IDAHO...
  SOUTHEASTERN BENEWAH COUNTY IN THE PANHANDLE OF IDAHO...
  EASTERN LATAH COUNTY IN THE PANHANDLE OF IDAHO...
  SOUTHWESTERN SHOSHONE COUNTY IN THE PANHANDLE OF IDAHO...

* UNTIL 200 PM PDT

* AT 115 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO
  BASEBALL SIZE.  THIS STORM WAS LOCATED NEAR KENDRICK...OR 18 MILES 
SOUTHEAST OF MOSCOW...AND MOVING NORTHEAST AT 45 MPH.  HAIL GREATER 
THAN PING BALL SIZE HAS BEEN REPORTED WITH THIS STORM IN JULIETTA. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SOUTHWICK...SPALDING...DEARY...HELMER...BOVILL...CLARKIA AND SANTA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

&&

LAT...LON 4692 11587 4693 11631 4667 11631 4662 11640
      4662 11644 4659 11645 4651 11657 4659 11681
      4725 11642 4699 11575
TIME...MOT...LOC 2018Z 205DEG 40KT 4664 11663

$$

JW

2 follow-up statements

114 
WWUS56 KOTX 202036
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
136 PM PDT FRI JUL 20 2012

IDC069-202041-
/O.CAN.KOTX.SV.W.0035.000000T0000Z-120720T2100Z/
NEZ PERCE ID-
136 PM PDT FRI JUL 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEZ PERCE COUNTY
IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED NORTH OF 
NEZ PERCE COUNTY. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

LAT...LON 4692 11587 4693 11631 4672 11632 4671 11631
      4667 11631 4662 11640 4662 11645 4665 11649
      4670 11667 4725 11642 4699 11575
TIME...MOT...LOC 2031Z 205DEG 40KT 4677 11654

$$

IDC009-057-079-202100-
/O.CON.KOTX.SV.W.0035.000000T0000Z-120720T2100Z/
SHOSHONE ID-BENEWAH ID-LATAH ID-
136 PM PDT FRI JUL 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM PDT
FOR EASTERN LATAH...SOUTHEASTERN BENEWAH AND SOUTHWESTERN SHOSHONE
COUNTIES...

AT 128 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE 
HAIL.  THIS STORM WAS LOCATED NEAR DEARY...OR 21 MILES EAST OF 
MOSCOW...MOVING NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HELMER...BOVILL...CLARKIA AND SANTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL OF AT LEAST GOLF BALL SIZE WAS REPORTED EARLIER IN JULIETTA 
WITH QUARTER SIZE HAIL REPORTED IN KENDRICK WITH THIS STORM. IF YOU 
ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE 
AND PROPERTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

&&

LAT...LON 4692 11587 4693 11631 4672 11632 4671 11631
      4667 11631 4662 11640 4662 11645 4665 11649
      4670 11667 4725 11642 4699 11575
TIME...MOT...LOC 2031Z 205DEG 40KT 4677 11654

$$

JW

191 
WWUS56 KOTX 202050
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
150 PM PDT FRI JUL 20 2012

IDC009-057-079-202100-
/O.CON.KOTX.SV.W.0035.000000T0000Z-120720T2100Z/
SHOSHONE ID-BENEWAH ID-LATAH ID-
150 PM PDT FRI JUL 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM PDT
FOR NORTHEASTERN LATAH...SOUTHEASTERN BENEWAH AND SOUTHWESTERN
SHOSHONE COUNTIES...

AT 146 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG SIZE 
HAIL.  THIS STORM WAS LOCATED NEAR BOVILL...OR 28 MILES SOUTH OF ST. 
MARIES...MOVING NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CLARKIA
AND SANTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL OF AT LEAST GOLF BALL SIZE WAS REPORTED EARLIER IN JULIETTA 
WITH QUARTER SIZE HAIL REPORTED IN KENDRICK WITH THIS STORM. IF YOU 
ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE 
AND PROPERTY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

&&

LAT...LON 4722 11643 4706 11616 4693 11631 4682 11640
      4684 11661 4705 11651
TIME...MOT...LOC 2049Z 205DEG 40KT 4695 11641

$$

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:09 PM PDT	Special Weather Statement	OTX	Nez Perce	51 min
Jul 20, 12:39 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	51 min
Jul 20, 12:57 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	48 min
Jul 20, 1:04 PM PDT	Areal Flood Advisory	OTX	Nez Perce	4 hr
Jul 20, 2:00 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Latah, Shoshone	45 min
Jul 20, 2:07 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	38 min
Jul 20, 2:21 PM PDT	Severe Thunderstorm Warning	OTX	Bonner, Kootenai	39 min
Jul 20, 2:41 PM PDT	Severe Thunderstorm Warning	OTX	Kootenai, Shoshone	49 min
Jul 20, 2:58 PM PDT	Severe Thunderstorm Warning	OTX	Shoshone	47 min
Jul 20, 3:17 PM PDT	Severe Thunderstorm Warning	OTX	Kootenai	43 min
Jul 20, 3:18 PM PDT	Areal Flood Advisory	OTX	Latah	117 min
Jul 20, 3:20 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Kootenai, Latah	40 min
Jul 20, 3:35 PM PDT	Areal Flood Warning	OTX	Bonner, Boundary, Kootenai, Shoshone	4 hr
Jul 20, 3:37 PM PDT	Severe Thunderstorm Warning	OTX	Bonner, Boundary	53 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.