Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS Missoula, MT

July 20, 2012Clearwater County, Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Jul 20, 2012, 2:26 PM PDT for Clearwater County, Idaho County, Idaho. It was in force for 49 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, 2:26 PM PDT (21:26 UTC)
Expired: Jul 20, 2012, 3:15 PM PDT
In force: 49 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

Counties Clearwater County, ID, Idaho County, ID

The radar

The Missoula radar (KMSX), 178 km from the middle of the area, began a volume at 21:28 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, 3:00 PM PDT	TSTM WND DMG	Kooskia, ID	TREE BRANCHES DOWN AND LOSS OF POWER IN TOWN.

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, 9.4 hours before the alert went out and 146 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.

852 
WUUS55 KMSO 202126
SVRMSO
IDC035-049-202215-
/O.NEW.KMSO.SV.W.0045.120720T2126Z-120720T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
226 PM PDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 315 PM PDT.

* AT 218 PM PDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING ONE INCH HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 18 MILES NORTHWEST OF ELK RIVER TO 16 MILES
  NORTHWEST OF WEIPPE TO 24 MILES SOUTHWEST OF KOOSKIA...OR ALONG A
  LINE EXTENDING FROM 28 MILES SOUTH OF ST. MARIES TO OROFINO TO 16
  MILES WEST OF GRANGEVILLE...AND WERE MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...CARDIFF...COTTONWOOD...DENT...EAST
  KAMIAH...ELK RIVER...GLENWOOD...GREER...HEADQUARTERS...JAYPE...
  KEUTERVILLE...KOOSKIA...MUSSELSHELL...PARDEE...PIERCE...STITES...
  SYRINGA...WEIPPE...WINONA AND WOODLAND.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR NORTH CENTRAL IDAHO AND NORTHWESTERN MONTANA.

&&

LAT...LON 4619 11637 4616 11620 4622 11614 4623 11604
      4630 11614 4640 11619 4642 11627 4651 11622
      4668 11635 4693 11634 4694 11556 4676 11542
      4615 11572 4591 11651
TIME...MOT...LOC 2126Z 246DEG 31KT 4695 11640 4655 11610
          4603 11635

$$
KITSMILLER

1 follow-up statement

559 
WWUS55 KMSO 202208
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
408 PM MDT FRI JUL 20 2012

IDC035-049-202217-
/O.EXP.KMSO.SV.W.0045.000000T0000Z-120720T2215Z/
IDAHO ID-CLEARWATER ID-
308 PM PDT FRI JUL 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CLEARWATER AND
NORTHWESTERN IDAHO COUNTIES EXPIRES AT 315 PM PDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR NORTH CENTRAL IDAHO AND NORTHWESTERN MONTANA.

LAT...LON 4619 11637 4616 11620 4622 11614 4623 11604
      4630 11614 4640 11619 4642 11627 4651 11622
      4668 11635 4693 11634 4694 11556 4676 11542
      4615 11572 4591 11651
TIME...MOT...LOC 2207Z 246DEG 31KT 4709 11592 4669 11563
          4617 11589

$$
KITSMILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 1:12 PM PDT	Special Weather Statement	MSO	Clearwater	48 min
Jul 20, 1:58 PM PDT	Severe Thunderstorm Warning	MSO	Clearwater	32 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.