Alert archive / Montana / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 21, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 5, 2012, 6:16 PM MDT for Chouteau County, Fergus County, Judith Basin County, Montana. It was in force for 59 min. 3 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
- Jun 5, 2012, 6:16 PM MDT (00:16 UTC)
- Expired
- Jun 5, 2012, 7:15 PM MDT
- In force
- 59 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
Counties Chouteau County, MT, Fergus County, MT, Judith Basin County, MT
The radar
The Great Falls radar (KTFX), 109 km from the middle of the area, began a volume at 00:20 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 |
|---|---|---|---|
| Jun 5, 6:18 PM MDT | HAIL 1.75 | Denton, MT | ESTIMATED GOLF BALL SIZE HAIL WITH FUNNEL CLOUD OBSERVED |
| Jun 5, 6:53 PM MDT | TORNADO | Coffee Creek, MT | LOCAL LAW ENFORCEMENT CONFIRMED TORNADO ON GROUND WITH LARGE PATH AND DAMAGE |
| Jun 5, 6:55 PM MDT | HAIL 1 | 16 E Geraldine, MT | ESTIMATED 1.0 INCH PLUS SIZE HAIL |
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 |
|---|---|---|---|
| Jun 5, 2:37 PM MDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.3 hours before the alert went out and 263 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
- 880 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 2578 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 244 m²/s²
- 0-3 km storm-relative helicity
- 359 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
735 WUUS55 KTFX 060016 SVRTFX MTC015-027-045-060115- /O.NEW.KTFX.SV.W.0021.120606T0016Z-120606T0115Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 616 PM MDT TUE JUN 5 2012 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN FERGUS COUNTY IN CENTRAL MONTANA... NORTHEASTERN JUDITH BASIN COUNTY IN CENTRAL MONTANA... SOUTHEASTERN CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA... * UNTIL 715 PM MDT * AT 615 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES SOUTH OF DENTON...MOVING NORTH AT 35 MPH. * LOCATIONS IN THE WARNING INCLUDE DENTON...STANFORD AND WINIFRED. HAIL TO THE SIZE OF GOLF BALLS AND WIND GUSTS TO 60 MPH ARE LIKELY WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT TUESDAY EVENING FOR NORTHWESTERN MONTANA. && LAT...LON 4781 11013 4761 10926 4700 10989 4713 11029 TIME...MOT...LOC 0016Z 186DEG 30KT 4723 10996 $$ MLV
1 follow-up statement
832 WWUS55 KTFX 060108 SVSTFX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 708 PM MDT TUE JUN 5 2012 MTC015-027-045-060118- /O.EXP.KTFX.SV.W.0021.000000T0000Z-120606T0115Z/ CHOUTEAU MT-FERGUS MT-JUDITH BASIN MT- 708 PM MDT TUE JUN 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JUDITH BASIN... NORTHWESTERN FERGUS AND SOUTHEASTERN CHOUTEAU COUNTIES WILL EXPIRE AT 715 PM MDT... NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXPIRED...HOWEVER THIS STORM REMAINS SEVERE AND A NEW WARNING IS NOW IN EFFECT. A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT TUESDAY EVENING FOR NORTHWESTERN MONTANA. LAT...LON 4781 11013 4761 10926 4700 10989 4713 11029 TIME...MOT...LOC 0108Z 186DEG 30KT 4766 10989 $$ MLV
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 6:06 PM MDT | Special Weather Statement | TFX | Beaverhead | 39 min |
| Jun 5, 6:08 PM MDT | Special Weather Statement | TFX | Cascade | 67 min |
| Jun 5, 6:11 PM MDT | Tornado Warning | TFX | Chouteau, Fergus, Judith Basin | 49 min |
| Jun 5, 6:52 PM MDT | Tornado Warning | TFX | Blaine, Chouteau, Fergus | 23 min |
| Jun 5, 7:06 PM MDT | Tornado Warning | TFX | Blaine, Chouteau, Fergus, Hill | 24 min |
| Jun 5, 7:24 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 51 min |
| Jun 5, 7:29 PM MDT | Tornado Warning | TFX | Blaine, Chouteau, Hill | 46 min |
| Jun 5, 8:03 PM MDT | Special Weather Statement | TFX | Cascade | 42 min |
| Jun 5, 8:09 PM MDT | Tornado Warning | TFX | Chouteau, Hill, Liberty | 45 min |
| Jun 5, 9:02 PM MDT | Special Weather Statement | TFX | Liberty | 43 min |
| Jun 5, 9:04 PM MDT | Special Weather Statement | TFX | Teton | 41 min |
| Jun 5, 9:29 PM MDT | Special Weather Statement | TFX | Chouteau | 61 min |
| Jun 5, 9:35 PM MDT | High Wind Watch | TFX | 7 hr | |
| Jun 5, 10:09 PM MDT | Special Weather Statement | TFX | Pondera | 51 min |
| Jun 5, 10:12 PM MDT | Special Weather Statement | TFX | Chouteau | 48 min |
| Jun 6, 4:20 AM MDT | High Wind Warning | TFX | 16 hr | |
| Jun 6, 9:39 AM MDT | River Flood Warning | TFX | Cascade | 3 days |
| Jun 6, 9:39 AM MDT | River Flood Warning | TFX | Cascade | 3 days |
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.