Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 43, NWS Spokane, WA

July 20, 2012Shoshone County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 20, 2012, 2:58 PM PDT for Shoshone County, Idaho. 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 20, 2012, 2:58 PM PDT (21:58 UTC)
Expired
Jul 20, 2012, 3:45 PM PDT
In force
47 min
Issued by
NWS Spokane, WA
Area
Storm-based polygon

County Shoshone County, ID

The radar

The Missoula radar (KMSX), 130 km from the middle of the area, began a volume at 22:00 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

TimeReportWhereRemark
Jul 20, 3:25 PM PDTTSTM WND DMG9 E Avery, IDNINE TREES BLOWN DOWN AT TIN CAN CAMPGROUND
Jul 20, 3:27 PM PDTHAIL 0.5Avery, 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.

IssuedProductOfficeLasted
Jul 20, 11:38 AM PDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.0 hours before the alert went out and 77 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 12:00Z on 2012-07-20Temperature 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 12:00Z on 2012-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.193958Sfc1 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
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.

352 
WUUS56 KOTX 202158
SVROTX
IDC079-202245-
/O.NEW.KOTX.SV.W.0043.120720T2158Z-120720T2245Z/

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

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN SHOSHONE COUNTY IN THE PANHANDLE OF IDAHO...

* UNTIL 345 PM PDT

* AT 255 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 26
  MILES SOUTHWEST OF AVERY...OR 31 MILES NORTH OF OROFINO...AND
  MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  AVERY...TURNER FLAT CAMPGROUND...TIN CAN CAMPGROUND AND CONRAD
  CROSSING CAMPGROUND

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

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.

HAIL UP TO 1.25 INCHES IN DIAMETER HAS BEEN REPORTED WITH THIS 
STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION 
TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4692 11575 4693 11618 4694 11628 4748 11563
      4747 11562 4742 11568 4739 11564 4738 11558
      4730 11550 4722 11528 4718 11527
TIME...MOT...LOC 2157Z 217DEG 40KT 4693 11603

$$

JCOTE
2 follow-up statements
436 
WWUS56 KOTX 202228 RRA
SVSOTX

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

IDC079-202245-
/O.CON.KOTX.SV.W.0043.000000T0000Z-120720T2245Z/
SHOSHONE ID-
328 PM PDT FRI JUL 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM PDT
FOR CENTRAL SHOSHONE COUNTY...

AT 325 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 6 MILES SOUTH OF TIN CAN CAMPGROUND...OR 26 MILES SOUTHEAST
OF WALLACE...MOVING NORTHEAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
AVERY...TURNER FLAT CAMPGROUND AND CONRAD CROSSING CAMPGROUND.

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 4704 11553 4702 11556 4721 11596 4747 11565
      4746 11563 4742 11568 4739 11564 4738 11558
      4730 11550 4722 11528 4719 11527
TIME...MOT...LOC 2228Z 217DEG 32KT 4717 11562

$$

JCOTE
422 
WWUS56 KOTX 202244
SVSOTX

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

IDC079-202253-
/O.EXP.KOTX.SV.W.0043.000000T0000Z-120720T2245Z/
SHOSHONE ID-
344 PM PDT FRI JUL 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SHOSHONE COUNTY WILL
EXPIRE AT 345 PM PDT...

DOPPLER RADAR INDICATED THE SEVERE THUNDERSTORM IS MOVING OUT OF 
SHOSHONE COUNTY AND THE WARNING IS ALLOWED TO EXPIRE. 

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 4704 11553 4702 11556 4721 11596 4747 11565
      4746 11563 4742 11568 4739 11564 4738 11558
      4730 11550 4722 11528 4719 11527
TIME...MOT...LOC 2243Z 217DEG 32KT 4728 11550

$$

JCOTE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 7:09 PM PDTSpecial Weather StatementOTXNez Perce51 min
Jul 20, 12:39 PM PDTSevere Thunderstorm WarningOTXLatah, Nez Perce51 min
Jul 20, 12:57 PM PDTSevere Thunderstorm WarningOTXLatah, Nez Perce48 min
Jul 20, 1:04 PM PDTAreal Flood AdvisoryOTXNez Perce4 hr
Jul 20, 1:18 PM PDTSevere Thunderstorm WarningOTXBenewah, Latah, Nez Perce, Shoshone42 min
Jul 20, 2:00 PM PDTSevere Thunderstorm WarningOTXBenewah, Latah, Shoshone45 min
Jul 20, 2:07 PM PDTSevere Thunderstorm WarningOTXLatah, Nez Perce38 min
Jul 20, 2:21 PM PDTSevere Thunderstorm WarningOTXBonner, Kootenai39 min
Jul 20, 2:41 PM PDTSevere Thunderstorm WarningOTXKootenai, Shoshone49 min
Jul 20, 3:17 PM PDTSevere Thunderstorm WarningOTXKootenai43 min
Jul 20, 3:18 PM PDTAreal Flood AdvisoryOTXLatah117 min
Jul 20, 3:20 PM PDTSevere Thunderstorm WarningOTXBenewah, Kootenai, Latah40 min
Jul 20, 3:35 PM PDTAreal Flood WarningOTXBonner, Boundary, Kootenai, Shoshone4 hr
Jul 20, 3:37 PM PDTSevere Thunderstorm WarningOTXBonner, Boundary53 min

Nearby

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