Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 1, NWS Missoula, MT

April 24, 2012Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Apr 24, 2012, 7:03 PM PDT for Idaho County, Idaho. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 24, 2012, 7:03 PM PDT (02:03 UTC)
Expired
Apr 24, 2012, 7:40 PM PDT
In force
37 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

County Idaho County, ID

The radar

The Missoula radar (KMSX), 170 km from the middle of the area, began a volume at 02:04 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 2.1 hours before the alert went out and 165 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 2012-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 231 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2012-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 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
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.

501 
WUUS55 KMSO 250203
SVRMSO
IDC049-250245-
/O.NEW.KMSO.SV.W.0001.120425T0203Z-120425T0245Z/

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

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 745 PM PDT.

* AT 657 PM PDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER.  THIS STORM
  WAS LOCATED NEAR EAST KAMIAH...OR ABOUT NEAR KAMIAH...AND WAS
  MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...EAST KAMIAH...GLENWOOD...KOOSKIA...
  LOWELL AND SYRINGA.

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 4622 11607 4623 11604 4625 11607 4630 11607
      4631 11600 4629 11597 4627 11579 4630 11575
      4636 11573 4638 11560 4611 11544 4612 11607
TIME...MOT...LOC 0203Z 272DEG 14KT 4621 11596

$$
2 follow-up statements
264 
WWUS55 KMSO 250226
SVSMSO

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

IDC049-250245-
/O.CON.KMSO.SV.W.0001.000000T0000Z-120425T0245Z/
IDAHO ID-
726 PM PDT TUE APR 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM PDT
FOR NORTHERN IDAHO COUNTY...

* AT 719 PM PDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED NEAR SYRINGA...OR ABOUT 14 MILES EAST OF
  KAMIAH...AND WAS MOVING EAST AT 30 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4618 11584 4618 11583 4626 11582 4630 11575
      4635 11572 4638 11560 4612 11544 4611 11552
      4614 11577 4617 11584 4620 11587
TIME...MOT...LOC 0226Z 267DEG 25KT 4623 11566

$$
848 
WWUS55 KMSO 250240
SVSMSO

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

IDC049-250249-
/O.CAN.KMSO.SV.W.0001.000000T0000Z-120425T0245Z/
IDAHO ID-
740 PM PDT TUE APR 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN IDAHO COUNTY IS
CANCELLED...

THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. THEREFORE THE SEVERE 
THUNDERSTORM WARNING HAS BEEN CANCELLED. 

LAT...LON 4618 11584 4618 11583 4626 11582 4630 11575
      4635 11572 4638 11560 4612 11544 4611 11552
      4614 11577 4617 11584 4620 11587
TIME...MOT...LOC 0239Z 272DEG 14KT 4620 11576

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 24, 5:31 PM PDTSpecial Weather StatementMSOClearwater44 min
Apr 24, 7:46 PM PDTSevere Thunderstorm WarningMSOClearwater54 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.