Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Great Falls, MT

June 9, 2021Blaine County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 9, 2021, 9:38 PM MDT for Blaine County, Montana. It was in force for 40 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: Jun 9, 2021, 9:38 PM MDT (03:38 UTC)
Expired: Jun 9, 2021, 10:18 PM MDT
In force: 40 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 177 km from the middle of the area, began a volume at 03:38 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.

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 9, 6:42 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 3.6 hours before the alert went out and 203 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 22 J/kg
Mixed-layer CIN: -195 J/kg
Mixed-layer LCL: 1287 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 408 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

903 
WUUS55 KTFX 100338
SVRTFX
MTC005-100430-
/O.NEW.KTFX.SV.W.0012.210610T0338Z-210610T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
938 PM MDT Wed Jun 9 2021

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Blaine County in north central Montana...

* Until 1030 PM MDT.

* At 937 PM MDT, a severe thunderstorm was located near Chinook,
  moving northeast at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Hogeland and Zurich. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Great Falls.

&&

LAT...LON 4894 10845 4854 10909 4867 10932 4901 10899
      4900 10860
TIME...MOT...LOC 0337Z 216DEG 32KT 4864 10917 

HAIL...1.00IN
WIND...60MPH
 
$$

Kredensor

1 follow-up statement

790 
WWUS55 KTFX 100418
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
1018 PM MDT Wed Jun 9 2021

MTC005-100428-
/O.CAN.KTFX.SV.W.0012.000000T0000Z-210610T0430Z/
Blaine MT-
1018 PM MDT Wed Jun 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BLAINE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight MDT for
north central Montana.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Great Falls.

LAT...LON 4894 10845 4854 10909 4867 10932 4901 10899
      4900 10860
TIME...MOT...LOC 0416Z 216DEG 32KT 4894 10884 

$$

Kredensor

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 6:18 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	42 min
Jun 9, 6:55 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	35 min
Jun 9, 7:08 PM MDT	Special Weather Statement	TFX	Fergus	22 min
Jun 9, 7:19 PM MDT	Special Weather Statement	TFX	Teton	56 min
Jun 9, 7:26 PM MDT	Special Weather Statement	TFX	Fergus	34 min
Jun 9, 7:28 PM MDT	Special Weather Statement	TFX	Judith Basin	32 min
Jun 9, 7:36 PM MDT	Special Weather Statement	TFX	Fergus	24 min
Jun 9, 7:53 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	37 min
Jun 9, 7:57 PM MDT	Special Weather Statement	TFX	Hill	33 min
Jun 9, 8:04 PM MDT	Special Weather Statement	TFX	Judith Basin	26 min
Jun 9, 8:19 PM MDT	Special Weather Statement	TFX	Teton	26 min
Jun 9, 8:28 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Judith Basin	32 min
Jun 9, 8:31 PM MDT	Special Weather Statement	TFX	Chouteau	29 min
Jun 9, 8:42 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	33 min
Jun 9, 8:45 PM MDT	Special Weather Statement	TFX	Petroleum	30 min
Jun 9, 8:48 PM MDT	Special Weather Statement	TFX	Hill	27 min
Jun 9, 8:57 PM MDT	Special Weather Statement	TFX	Blaine	18 min
Jun 9, 9:04 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Hill	26 min
Jun 9, 9:09 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	21 min
Jun 9, 9:18 PM MDT	Special Weather Statement	TFX	Toole	42 min
Jun 9, 9:26 PM MDT	Special Weather Statement	TFX	Blaine	49 min
Jun 9, 9:30 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	45 min
Jun 9, 9:37 PM MDT	Special Weather Statement	TFX	Blaine	23 min
Jun 9, 9:38 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 9, 9:51 PM MDT	Special Weather Statement	TFX	Blaine	24 min
Jun 9, 10:17 PM MDT	Special Weather Statement	TFX	Blaine	28 min
Jun 9, 10:32 PM MDT	Special Weather Statement	TFX	Fergus	43 min
Jun 9, 10:48 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	42 min
Jun 9, 11:34 PM MDT	Special Weather Statement	TFX	Blaine, Fergus, Hill	116 min
Jun 10, 2:11 AM MDT	Special Weather Statement	TFX	Blaine	34 min
Jun 10, 2:53 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 10, 3:08 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	52 min
Jun 10, 3:53 PM MDT	Special Weather Statement	TFX	Fergus	37 min
Jun 10, 4:22 PM MDT	Special Weather Statement	TFX	Cascade	23 min
Jun 10, 4:56 PM MDT	Special Weather Statement	TFX	Cascade	34 min
Jun 10, 5:33 PM MDT	Special Weather Statement	TFX	Cascade	27 min

Nearby

Severe Thunderstorm Warnings in Montana, 2021 Every severe thunderstorm warning in 2021

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; radar from the NEXRAD Level II archive.