Alert archive / Montana / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 21, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 7, 2011, 1:53 PM MDT for Fergus County, Montana. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2011, 1:53 PM MDT (19:53 UTC)
- Expired
- Jul 7, 2011, 2:34 PM MDT
- In force
- 41 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
County Fergus County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.9 hours before the alert went out and 148 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
- 874 J/kg
- Mixed-layer CIN
- -164 J/kg
- Mixed-layer LCL
- 1766 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
675
WUUS55 KTFX 071953
SVRTFX
MTC027-072100-
/O.NEW.KTFX.SV.W.0021.110707T1953Z-110707T2100Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
153 PM MDT THU JUL 7 2011
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL FERGUS COUNTY IN CENTRAL MONTANA...
* UNTIL 300 PM MDT
* AT 147 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 16 MILES SOUTH OF LEWISTOWN...MOVING EAST AT 20
MPH.
* THE SEVERE THUNDERSTORM WILL GENERALLY REMAIN OVER RURAL AREAS
OF SOUTH CENTRAL FERGUS COUNTY NEAR THE BIG AND LITTLE SNOWY
MOUNTAINS INCLUDING THE HALF MOON PASS AREA.
HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH ARE LIKELY WITH
THIS STORM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
&&
LAT...LON 4682 10862 4675 10861 4674 10863 4675 10938
4673 10939 4674 10945 4693 10945 4699 10860
4699 10859 4689 10859 4684 10860
TIME...MOT...LOC 1952Z 274DEG 19KT 4684 10934
$$
HOENISCH1 follow-up statement
457
WWUS55 KTFX 072034
SVSTFX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
234 PM MDT THU JUL 7 2011
MTC027-072044-
/O.CAN.KTFX.SV.W.0021.000000T0000Z-110707T2100Z/
FERGUS MT-
234 PM MDT THU JUL 7 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL FERGUS COUNTY IS
CANCELLED...
NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SEVERE THUNDERSTORM
THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER SEVERE...
THUS THE WARNING HAS BEEN CANCELLED.
LAT...LON 4682 10862 4675 10861 4674 10863 4675 10938
4673 10939 4674 10945 4693 10945 4699 10860
4699 10859 4689 10859 4684 10860
TIME...MOT...LOC 2034Z 274DEG 19KT 4682 10902
$$
SUKThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:47 AM MDT | Special Weather Statement | TFX | Fergus | 43 min |
| Jul 7, 8:47 AM MDT | Special Weather Statement | TFX | Petroleum | 43 min |
| Jul 7, 9:32 AM MDT | Severe Thunderstorm Warning | TFX | Fergus | 30 min |
| Jul 7, 11:59 AM MDT | Special Weather Statement | TFX | Judith Basin | 46 min |
| Jul 7, 12:39 PM MDT | Special Weather Statement | TFX | Wheatland | 51 min |
| Jul 7, 1:33 PM MDT | Special Weather Statement | TFX | Fergus | 72 min |
| Jul 7, 2:39 PM MDT | Special Weather Statement | TFX | Wheatland | 51 min |
| Jul 7, 2:56 PM MDT | Flash Flood Warning | TFX | Fergus, Judith Basin | 3 hr |
| Jul 7, 2:57 PM MDT | High Wind Warning | TFX | 36 hr | |
| Jul 7, 3:51 PM MDT | Special Weather Statement | TFX | Blaine | 54 min |
| Jul 7, 5:11 PM MDT | Areal Flood Warning | TFX | Madison | 35 min |
| Jul 7, 5:37 PM MDT | Special Weather Statement | TFX | Blaine | 53 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.