Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Missoula, MT

April 24, 2012Clearwater County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Apr 24, 2012, 7:46 PM PDT for Clearwater County, Idaho. It was in force for 54 min. 4 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: Apr 24, 2012, 7:46 PM PDT (02:46 UTC)
Expired: Apr 24, 2012, 8:40 PM PDT
In force: 54 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

County Clearwater County, ID

The radar

The Missoula radar (KMSX), 177 km from the middle of the area, began a volume at 02:48 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
Apr 24, 8:00 PM PDT	HAIL 1.75	Orofino, ID	TRAINED SPOTTER REPORTED GOLF BALL SIZE HAIL IN OROFINO
Apr 24, 8:05 PM PDT	HAIL 1	3 Ne Orofino, ID	TRAINED SPOTTER REPORTED 1 INCH HAIL 3 MILES NE OF OROFINO
Apr 24, 8:10 PM PDT	HAIL 1	2 Nw Orofino, ID	TRAINED SPOTTER REPORTED QUARTER SIZE HAIL 2 MILES NW OF OROFINO
Apr 24, 8:10 PM PDT	HAIL 1.25	5 Ne Orofino, ID	TRAINED SPOTTER REPORTED HALF DOLLAR SIZE HAIL 5 NE OF OROFINO

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, 2.8 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: 231 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1810 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

446 
WUUS55 KMSO 250246
SVRMSO
IDC035-250345-
/O.NEW.KMSO.SV.W.0002.120425T0246Z-120425T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
746 PM PDT TUE APR 24 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CLEARWATER COUNTY IN NORTH CENTRAL IDAHO...

* UNTIL 845 PM PDT.

* AT 741 PM PDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER.  THIS STORM
  WAS LOCATED 9 MILES SOUTHWEST OF OROFINO...AND WAS MOVING NORTHEAST
  AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...CARDIFF...GREER...HEADQUARTERS...
  JAYPE...OROFINO...PIERCE AND RIVERSIDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS ARE LIKELY WITH THIS SEVERE THUNDERSTORM. LARGE HAIL
IS POSSIBLE...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 4647 11636 4675 11583 4650 11568 4636 11603
      4635 11613 4637 11615 4636 11617 4640 11620
      4640 11629 4645 11636
TIME...MOT...LOC 0246Z 242DEG 31KT 4639 11631

$$

2 follow-up statements

753 
WWUS55 KMSO 250306
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
906 PM MDT TUE APR 24 2012

IDC035-250345-
/O.CON.KMSO.SV.W.0002.000000T0000Z-120425T0345Z/
CLEARWATER ID-
806 PM PDT TUE APR 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM PDT
FOR SOUTHWESTERN CLEARWATER COUNTY...

* AT 800 PM PDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE 
  THUNDERSTORM PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE.  
  THIS STORM WAS LOCATED OVER OROFINO...AND WAS MOVING NORTHEAST AT 
  35 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 4647 11636 4675 11583 4650 11568 4636 11603
      4635 11613 4637 11615 4636 11617 4640 11620
      4640 11629 4645 11636
TIME...MOT...LOC 0305Z 242DEG 31KT 4647 11610

$$

782 
WWUS55 KMSO 250340
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
940 PM MDT TUE APR 24 2012

IDC035-250350-
/O.CAN.KMSO.SV.W.0002.000000T0000Z-120425T0345Z/
CLEARWATER ID-
840 PM PDT TUE APR 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CLEARWATER COUNTY
IS CANCELLED...

THE STORM HAS WEAKENED AND IS NO LONGER EXHIBITING HAIL OR STRONG 
WINDS. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN 
CANCELLED. 

LAT...LON 4647 11636 4675 11583 4650 11568 4636 11603
      4635 11613 4637 11615 4636 11617 4640 11620
      4640 11629 4645 11636
TIME...MOT...LOC 0340Z 242DEG 31KT 4661 11571

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 5:31 PM PDT	Special Weather Statement	MSO	Clearwater	44 min
Apr 24, 7:03 PM PDT	Severe Thunderstorm Warning	MSO	Idaho	37 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.