Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 42, NWS Missoula, MT

July 17, 2012Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Jul 17, 2012, 5:55 PM PDT for Idaho County, Idaho. It was in force for 50 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 17, 2012, 5:55 PM PDT (00:55 UTC)
Expired
Jul 17, 2012, 6:45 PM PDT
In force
50 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

County Idaho County, ID

The radar

The Pendleton radar (KPDT), 192 km from the middle of the area, began a volume at 00:59 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 17, 6:12 PM PDTHAIL 1.75Cottonwood, IDPUBLIC REPORTED GOLF BALL SIZE HAIL AT HOSPITAL IN COTTONWOOD IDAHO

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, 0.9 hours before the alert went out and 186 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 00:00Z on 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 449 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 00:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 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
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.

335 
WUUS55 KMSO 180055
SVRMSO
IDC049-180145-
/O.NEW.KMSO.SV.W.0042.120718T0055Z-120718T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
555 PM PDT TUE JUL 17 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN IDAHO COUNTY IN CENTRAL IDAHO...

* UNTIL 645 PM PDT.

* AT 548 PM PDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM  
CAPABLE OF PRODUCING ONE INCH HAIL...AND DAMAGING WINDS IN EXCESS  
OF 60 MPH.  VERY HEAVY RAIN IS ALSO POSSIBLE...CAUSING MINOR 
FLOODING ON ROADWAYS.  THIS STORM WAS LOCATED NEAR KEUTERVILLE...OR 
ABOUT 17   MILES WEST OF GRANGEVILLE...AND WAS MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...COTTONWOOD...FENN...KEUTERVILLE AND
  WINONA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH
FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS
AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A
WELL PROTECTED AREA.

&&

LAT...LON 4604 11658 4601 11654 4606 11653 4621 11610
      4598 11597 4586 11651 4603 11660
TIME...MOT...LOC 0055Z 248DEG 14KT 4598 11643

$$
2 follow-up statements
212 
WWUS55 KMSO 180116
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
716 PM MDT TUE JUL 17 2012

IDC049-180145-
/O.CON.KMSO.SV.W.0042.000000T0000Z-120718T0145Z/
IDAHO ID-
616 PM PDT TUE JUL 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM PDT
FOR WESTERN IDAHO COUNTY...

* AT 606 PM PDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 50 MPH.  THIS STORM WAS LOCATED NEAR
  COTTONWOOD...OR ABOUT 13 MILES WEST OF GRANGEVILLE...AND WAS MOVING
  EAST AT 15 MPH.

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 4604 11658 4601 11654 4606 11653 4621 11610
      4598 11597 4586 11651 4603 11660
TIME...MOT...LOC 0116Z 248DEG 14KT 4601 11632

$$
143 
WWUS55 KMSO 180137
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
737 PM MDT TUE JUL 17 2012

IDC049-180146-
/O.EXP.KMSO.SV.W.0042.000000T0000Z-120718T0145Z/
IDAHO ID-
637 PM PDT TUE JUL 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN IDAHO COUNTY EXPIRES 
AT 645 PM PDT.  

LAT...LON 4604 11658 4601 11654 4606 11653 4621 11610
      4598 11597 4586 11651 4603 11660
TIME...MOT...LOC 0136Z 248DEG 14KT 4604 11622

$$

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 7:57 PM PDTSpecial Weather StatementMSOClearwater48 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.