Alert archive / Idaho / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 21, NWS Missoula, MT

August 6, 2009Lemhi County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Aug 6, 2009, 12:15 PM MDT for Lemhi County, Idaho. It was in force for 45 min. 6 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
Aug 6, 2009, 12:15 PM MDT (18:15 UTC)
Expired
Aug 6, 2009, 1:00 PM MDT
In force
45 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

County Lemhi County, ID

The radar

The Missoula radar (KMSX), 196 km from the middle of the area, began a volume at 18:17 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, 12:30 PM MDTHAIL 1.55 Nw Salmon, ID
Aug 6, 12:50 PM MDTHAIL 1.7510 Se North Fork, IDSPOTTER REPORT OF HAIL ON GROUND NEAR HIGHWAY 93 AND TOWER CREEK.
Aug 6, 12:51 PM MDTTSTM WND GST 715 Se North Fork, IDWIND GUST MEASURED BY KRILEY CREEK RAWS SITE.
Aug 6, 12:51 PM MDTHAIL 14 Se North Fork, IDQUARTER SIZE HAIL REPORTED NEAR CARMEN ACCUMULATED 3 TO 4 INCHES DEEP.
Aug 6, 12:51 PM MDTHAIL 1.754 Se North Fork, IDLARGE HAIL REPORT FROM PUBLIC IN CARMEN.
Aug 6, 12:51 PM MDTHAIL 1.755 N Salmon, IDLARGE HAIL REPORT FROM PUBLIC IN CARMEN.

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 12:00Z, 6.3 hours before the alert went out and 249 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 
WUUS55 KMSO 061815
SVRMSO
IDC059-061900-
/O.NEW.KMSO.SV.W.0021.090806T1815Z-090806T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1215 PM MDT THU AUG 6 2009

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 100 PM MDT.

* AT 1209 PM MDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING ONE TO TWO INCH SIZED HAIL...AND 
  DAMAGING WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 16 MILES SOUTHWEST OF HALE GULCH EAST OF SHOUP TO 21
  MILES SOUTH OF HALE GULCH EAST OF SHOUP...OR ALONG A LINE EXTENDING
  FROM 29 MILES WEST OF SALMON TO 17 MILES WEST OF SALMON...AND WERE
  MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...CARMEN...COBALT...GIBBONSVILLE...
  LEESBURG...NORTH FORK...SHOUP AND HALE GULCH EAST OF SHOUP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...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 4525 11455 4561 11390 4529 11371 4504 11422
TIME...MOT...LOC 1814Z 245DEG 20KT 4529 11444 4509 11419

$$

ALLEGRETTO
2 follow-up statements
000 
WWUS55 KMSO 061830
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1230 PM MDT THU AUG 6 2009

IDC059-061900-
/O.CON.KMSO.SV.W.0021.000000T0000Z-090806T1900Z/
LEMHI ID-
1230 PM MDT THU AUG 6 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM MDT
FOR NORTHERN LEMHI COUNTY...

* AT 1229 PM MDT...DOPPLER RADAR CONTINUED TO INDICATE A LINE OF
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING ONE TO TWO INCH SIZED 
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS 
  WERE LOCATED ALONG A LINE EXTENDING FROM SHOUP TO 7 MILES SOUTH 
  OF LEESBURG...OR ALONG A LINE EXTENDING FROM 24 MILES NORTHWEST 
  OF SALMON TO 10 MILES WEST OF SALMON...AND WERE MOVING NORTHEAST 
  AT 25 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 4530 11445 4561 11390 4529 11371 4509 11411
TIME...MOT...LOC 1829Z 245DEG 20KT 4532 11434 4512 11409

$$

ALLEGRETTO
000 
WWUS55 KMSO 061852
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1252 PM MDT THU AUG 6 2009

IDC059-061902-
/O.EXP.KMSO.SV.W.0021.000000T0000Z-090806T1900Z/
LEMHI ID-
1252 PM MDT THU AUG 6 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LEMHI COUNTY EXPIRES
AT 100 PM MDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
THURSDAY EVENING FOR EAST CENTRAL IDAHO AND WEST CENTRAL MONTANA.

LAT...LON 4530 11445 4561 11390 4529 11371 4509 11411
TIME...MOT...LOC 1852Z 245DEG 20KT 4537 11418 4519 11391

$$

ALLEGRETTO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 10:24 PM MDTSpecial Weather StatementMSOLewis51 min
Aug 5, 10:36 PM MDTSevere Thunderstorm WarningMSOClearwater, Idaho24 min
Aug 6, 10:29 AM MDTFlash Flood WatchMSOLemhi10 hr
Aug 6, 11:35 AM MDTSevere Thunderstorm WarningMSOLemhi40 min
Aug 6, 1:59 PM MDTSevere Thunderstorm WarningMSOLemhi61 min
Aug 6, 3:40 PM MDTFlood WatchMSOIdaho21 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2009Every severe thunderstorm warning 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.