Alert archive / Idaho / Tornado Warnings in 2009

Tornado Warning 2, NWS Pocatello, ID

August 6, 2009Custer County, Idaho

NWS Pocatello, ID issued this tornado warning at Aug 6, 2009, 12:43 PM MDT for Custer County, Idaho. It was in force for 32 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 6, 2009, 12:43 PM MDT (18:43 UTC)
Expired
Aug 6, 2009, 1:15 PM MDT
In force
32 min
Issued by
NWS Pocatello, ID
Area
Storm-based polygon

County Custer County, ID

The radar

The Boise radar (KCBX), 153 km from the middle of the area, began a volume at 18:46 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 6, 12:49 PM MDTHAIL 0.5Stanley, IDHAIL AND HEAVY RAIN WITH WINDS FROM NORTH NORTHWEST AT 12-15 MPH WITH GUSTS TO 18 MPH.

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.

IssuedProductOfficeLasted
Aug 6, 12:34 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 6.7 hours before the alert went out and 145 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 12:00Z on 2009-08-06Temperature 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 12:00Z on 2009-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -60 square meters per square second.1939587897Sfc1 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
1714 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-60 m²/s²
0-3 km storm-relative helicity
324 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.

000 
WFUS55 KPIH 061843
TORPIH
IDC037-061915-
/O.NEW.KPIH.TO.W.0002.090806T1843Z-090806T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE POCATELLO
1243 PM MDT THU AUG 6 2009

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL CUSTER COUNTY IN CENTRAL IDAHO...
  THIS INCLUDES THE CITY OF STANLEY...

* UNTIL 115 PM MDT

* AT 1240 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR STANLEY...
  MOVING NORTHEAST AT 30 MPH.

LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...STANLEY...STANLEY 
LAKE REDFISH LAKE AND CUSTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF 
BALL SIZED SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
THURSDAY EVENING FOR SOUTHEASTERN IDAHO.

&&

LAT...LON 4464 11480 4445 11448 4413 11493 4423 11514
TIME...MOT...LOC 1842Z 212DEG 24KT 4427 11496

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 7:10 PM MDTSevere Thunderstorm WarningPIHBlaine, Butte, Custer, Lincoln58 min
Aug 6, 10:52 AM MDTFlash Flood WatchPIH8 hr
Aug 6, 11:50 AM MDTSpecial Weather StatementPIH40 min
Aug 6, 12:04 PM MDTSevere Thunderstorm WarningPIHCuster56 min
Aug 6, 12:21 PM MDTTornado WarningPIHCuster24 min
Aug 6, 1:03 PM MDTSevere Thunderstorm WarningPIHCuster42 min
Aug 6, 1:12 PM MDTTornado WarningPIHCuster18 min
Aug 6, 1:39 PM MDTSpecial Weather StatementPIHBonneville51 min
Aug 6, 1:52 PM MDTSevere Thunderstorm WarningPIHBingham, Bonneville38 min
Aug 6, 2:18 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Bonneville, Caribou42 min
Aug 6, 2:29 PM MDTSevere Thunderstorm WarningPIHFremont, Madison46 min
Aug 6, 2:41 PM MDTSevere Thunderstorm WarningPIHBonneville, Madison, Teton49 min
Aug 6, 2:49 PM MDTSevere Thunderstorm WarningPIHBingham, Bonneville, Caribou41 min
Aug 6, 2:58 PM MDTSevere Thunderstorm WarningPIHFremont, Madison, Teton47 min
Aug 6, 3:19 PM MDTSevere Thunderstorm WarningPIHBannock, Bingham, Blaine, Butte, Cassia, Minidoka and 2 more41 min
Aug 6, 3:33 PM MDTSevere Thunderstorm WarningPIHBonneville, Teton29 min
Aug 6, 3:37 PM MDTSpecial Weather StatementPIHBlaine, Butte, Custer, Lincoln38 min
Aug 6, 3:44 PM MDTSevere Thunderstorm WarningPIHClark, Fremont, Jefferson39 min
Aug 6, 4:02 PM MDTSpecial Weather StatementPIHBingham43 min
Aug 6, 4:16 PM MDTSevere Thunderstorm WarningPIHCuster29 min
Aug 6, 4:41 PM MDTSevere Thunderstorm WarningPIHBingham, Butte, Clark, Jefferson49 min
Aug 6, 4:51 PM MDTSevere Thunderstorm WarningPIHCuster24 min
Aug 6, 5:03 PM MDTSevere Thunderstorm WarningPIHClark27 min
Aug 6, 5:20 PM MDTSevere Thunderstorm WarningPIHButte, Clark, Jefferson25 min
Aug 6, 5:52 PM MDTSpecial Weather StatementPIHCuster53 min

Nearby

Tornado Warnings in Idaho, 2009Every tornado warning in 2009Tornadoes in 2009

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.