Alert archive / Montana / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 47, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 20, 2012, 4:31 PM MDT for Lincoln County, Mineral County, Sanders County, Montana. It was in force for 59 min. 2 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
- Jul 20, 2012, 4:31 PM MDT (22:31 UTC)
- Expired
- Jul 20, 2012, 5:30 PM MDT
- In force
- 59 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
Counties Lincoln County, MT, Mineral County, MT, Sanders County, MT
The radar
The Missoula radar (KMSX), 118 km from the middle of the area, began a volume at 22:33 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 |
|---|---|---|---|
| Jul 20, 5:00 PM MDT | TSTM WND DMG | Thompson Falls, MT | SEVERAL TREES DOWN ALONG MAIN STREET |
| Jul 20, 5:00 PM MDT | HAIL 1 | Thompson Falls, MT |
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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 12:38 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 10.5 hours before the alert went out and 78 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
- 2619 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
380
WUUS55 KMSO 202231
SVRMSO
MTC053-061-089-202330-
/O.NEW.KMSO.SV.W.0047.120720T2231Z-120720T2330Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
431 PM MDT FRI JUL 20 2012
THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL SANDERS COUNTY IN NORTHWEST MONTANA...
SOUTHERN LINCOLN COUNTY IN NORTHWEST MONTANA...
NORTHWESTERN MINERAL COUNTY IN WEST CENTRAL MONTANA...
* UNTIL 530 PM MDT.
* AT 424 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DESTRUCTIVE WINDS IN
EXCESS OF 70 MPH. THIS STORM WAS LOCATED 16 MILES SOUTHWEST OF
HAUGAN...OR ABOUT 22 MILES WEST OF SAINT REGIS...AND WAS MOVING
NORTHEAST AT 35 MPH.
* LOCATIONS IMPACTED INCLUDE...BELKNAP...BEND...DE BORGIA...EAST
PORTAL...EDDY...HAUGAN...PARADISE...PLAINS...SALTESE...SNIDER...
SAINT REGIS...TAFT...THOMPSON FALLS AND WEEKSVILLE.
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.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FRIDAY
EVENING FOR NORTH CENTRAL IDAHO AND NORTHWESTERN MONTANA.
&&
LAT...LON 4746 11573 4746 11565 4749 11570 4804 11513
4745 11464 4713 11522 4719 11530 4726 11534
4725 11541 4729 11552 4737 11561 4737 11564
4743 11576
TIME...MOT...LOC 2231Z 216DEG 29KT 4723 11550
$$
KITSMILLER1 follow-up statement
893
WWUS55 KMSO 202327
SVSMSO
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
527 PM MDT FRI JUL 20 2012
MTC053-061-089-202335-
/O.EXP.KMSO.SV.W.0047.000000T0000Z-120720T2330Z/
MINERAL MT-LINCOLN MT-SANDERS MT-
527 PM MDT FRI JUL 20 2012
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SANDERS...SOUTHERN
LINCOLN AND NORTHWESTERN MINERAL COUNTIES EXPIRES AT 530 PM MDT...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FRIDAY
EVENING FOR NORTH CENTRAL IDAHO AND NORTHWESTERN MONTANA.
LAT...LON 4746 11573 4746 11565 4749 11570 4804 11513
4745 11464 4713 11522 4719 11530 4726 11534
4725 11541 4729 11552 4737 11561 4737 11564
4743 11576
TIME...MOT...LOC 2325Z 216DEG 29KT 4758 11512
$$
KITSMILLERThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:41 PM MDT | Special Weather Statement | MSO | Deer Lodge | 49 min |
| Jul 20, 3:05 PM MDT | Special Weather Statement | MSO | Missoula | 55 min |
| Jul 20, 3:09 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Ravalli, Sanders | 51 min |
| Jul 20, 3:30 PM MDT | Special Weather Statement | MSO | Lake | 60 min |
| Jul 20, 3:46 PM MDT | Special Weather Statement | MSO | Powell | 44 min |
| Jul 20, 3:52 PM MDT | Special Weather Statement | MSO | Sanders | 53 min |
| Jul 20, 4:21 PM MDT | Severe Thunderstorm Warning | MSO | Lincoln, Sanders | 39 min |
| Jul 20, 4:32 PM MDT | Special Weather Statement | MSO | Flathead, Lake | 58 min |
| Jul 20, 4:53 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lincoln, Sanders | 67 min |
Nearby
Severe Thunderstorm Warnings in Montana, 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.