Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Boise, ID

August 26, 20124 counties in Idaho

NWS Boise, ID issued this severe thunderstorm warning at Aug 26, 2012, 6:04 PM MDT for 4 counties in Idaho. It was in force for 56 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
Aug 26, 2012, 6:04 PM MDT (00:04 UTC)
Expired
Aug 26, 2012, 7:00 PM MDT
In force
56 min
Issued by
NWS Boise, ID
Area
Storm-based polygon

Counties Gooding County, ID, Jerome County, ID, Owyhee County, ID, Twin Falls County, ID

The radar

The Boise radar (KCBX), 143 km from the middle of the area, began a volume at 00:04 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.

What was reported inside it

TimeReportWhereRemark
Aug 26, 7:07 PM MDTTSTM WND DMGJerome, IDLARGE TREE UPROOTED. REPORTED TO LOCAL TWIN FALLS TV STATION KMVT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 0.1 hours before the alert went out and 147 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, Boise Airport, ID at 00:00Z on 2012-08-27Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 00:00Z on 2012-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4170 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
55 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.

329 
WUUS55 KBOI 270004
SVRBOI
IDC047-053-073-083-270100-
/O.NEW.KBOI.SV.W.0021.120827T0004Z-120827T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BOISE ID
604 PM MDT SUN AUG 26 2012

THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN GOODING COUNTY IN SOUTH CENTRAL IDAHO...
  WEST CENTRAL JEROME COUNTY IN SOUTH CENTRAL IDAHO...
  NORTHWESTERN TWIN FALLS COUNTY IN SOUTH CENTRAL IDAHO...
  AND EAST CENTRAL OWYHEE COUNTY IN SOUTHWEST IDAHO...

* UNTIL 700 PM MDT.

* AT 555 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  NORTHWEST OF ROSEWORTH...OR 27 MILES WEST OF TWIN FALLS...AND WAS
  MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CASTLEFORD AROUND 610 PM MDT...
  BUHL AROUND 625 PM MDT...
  HAGERMAN AROUND 645 PM MDT...
  WENDELL AROUND 650 PM MDT...
  JEROME AROUND 655 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO
PROTECT LIFE AND PROPERTY. SEEK SHELTER INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4290 11493 4272 11448 4238 11492 4247 11512
TIME...MOT...LOC 0003Z 209DEG 25KT 4251 11495

$$

GSKARI
1 follow-up statement
091 
WWUS55 KBOI 270036
SVSBOI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BOISE ID
636 PM MDT SUN AUG 26 2012

IDC047-053-073-083-270100-
/O.CON.KBOI.SV.W.0021.000000T0000Z-120827T0100Z/
GOODING ID-JEROME ID-OWYHEE ID-TWIN FALLS ID-
636 PM MDT SUN AUG 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR NORTHWESTERN TWIN FALLS...EAST CENTRAL OWYHEE...WEST CENTRAL
JEROME AND SOUTHEASTERN GOODING COUNTIES...

AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR BUHL...OR 17 MILES WEST OF JEROME...AND WAS MOVING
NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BUHL AND CASTLEFORD AROUND 635 PM MDT...
  HAGERMAN AROUND 645 PM MDT...
  WENDELL AROUND 650 PM MDT...
  JEROME AROUND 655 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO
PROTECT LIFE AND PROPERTY. SEEK SHELTER INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4290 11493 4272 11448 4238 11492 4247 11512
TIME...MOT...LOC 0036Z 209DEG 25KT 4271 11480

$$

GSKARI

The office that day

Everything else NWS Boise, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 26, 6:48 PM MDTSpecial Weather StatementBOITwin Falls42 min
Aug 26, 7:29 PM MDTSpecial Weather StatementBOIJerome46 min
Aug 26, 7:41 PM MDTSevere Thunderstorm WarningBOIJerome, Twin Falls34 min
Aug 26, 10:08 PM MDTSpecial Weather StatementBOIJerome37 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.