Alert archive / Idaho / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 21, NWS Missoula, MT
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 6, 12:30 PM MDT | HAIL 1.5 | 5 Nw Salmon, ID | |
| Aug 6, 12:50 PM MDT | HAIL 1.75 | 10 Se North Fork, ID | SPOTTER REPORT OF HAIL ON GROUND NEAR HIGHWAY 93 AND TOWER CREEK. |
| Aug 6, 12:51 PM MDT | TSTM WND GST 71 | 5 Se North Fork, ID | WIND GUST MEASURED BY KRILEY CREEK RAWS SITE. |
| Aug 6, 12:51 PM MDT | HAIL 1 | 4 Se North Fork, ID | QUARTER SIZE HAIL REPORTED NEAR CARMEN ACCUMULATED 3 TO 4 INCHES DEEP. |
| Aug 6, 12:51 PM MDT | HAIL 1.75 | 4 Se North Fork, ID | LARGE HAIL REPORT FROM PUBLIC IN CARMEN. |
| Aug 6, 12:51 PM MDT | HAIL 1.75 | 5 N Salmon, ID | LARGE 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 10:24 PM MDT | Special Weather Statement | MSO | Lewis | 51 min |
| Aug 5, 10:36 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 24 min |
| Aug 6, 10:29 AM MDT | Flash Flood Watch | MSO | Lemhi | 10 hr |
| Aug 6, 11:35 AM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 40 min |
| Aug 6, 1:59 PM MDT | Severe Thunderstorm Warning | MSO | Lemhi | 61 min |
| Aug 6, 3:40 PM MDT | Flood Watch | MSO | Idaho | 21 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.