Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS Great Falls, MT

June 4, 2021Meagher County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 4, 2021, 4:19 PM MDT for Meagher County, Montana. It was in force for 26 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 4, 2021, 4:19 PM MDT (22:19 UTC)
Expired: Jun 4, 2021, 4:45 PM MDT
In force: 26 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Meagher County, MT

The radar

The Great Falls radar (KTFX), 145 km from the middle of the area, began a volume at 22:22 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 4, 4:01 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.3 hours before the alert went out and 135 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: 86 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 2278 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

828 
WUUS55 KTFX 042219
SVRTFX
MTC059-042245-
/O.NEW.KTFX.SV.W.0001.210604T2219Z-210604T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
419 PM MDT Fri Jun 4 2021

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Meagher County in central Montana...

* Until 445 PM MDT.

* At 419 PM MDT, a severe thunderstorm was located 23 miles south of
  White Sulphur Springs, moving east at 40 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...
  Ringling.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4620 11083 4620 11084 4632 11084 4637 11040
      4619 11039
TIME...MOT...LOC 2219Z 269DEG 33KT 4623 11074 

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

RCG

2 follow-up statements

099 
WWUS55 KTFX 042229
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
429 PM MDT Fri Jun 4 2021

MTC059-042245-
/O.CON.KTFX.SV.W.0001.000000T0000Z-210604T2245Z/
Meagher MT-
429 PM MDT Fri Jun 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR SOUTHEASTERN MEAGHER COUNTY...

At 429 PM MDT, a severe thunderstorm was located 23 miles north of
Clyde Park, or 26 miles southeast of White Sulphur Springs, moving
east at 40 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.

This severe thunderstorm will remain over mainly rural areas of
southeastern Meagher County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4620 11073 4633 11070 4637 11040 4619 11039
TIME...MOT...LOC 2229Z 269DEG 33KT 4622 11060 

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

RCG

264 
WWUS55 KTFX 042240
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
440 PM MDT Fri Jun 4 2021

MTC059-042250-
/O.EXP.KTFX.SV.W.0001.000000T0000Z-210604T2245Z/
Meagher MT-
440 PM MDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MEAGHER COUNTY
WILL EXPIRE AT 445 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
central Montana.

LAT...LON 4620 11073 4633 11070 4637 11040 4619 11039
TIME...MOT...LOC 2240Z 269DEG 33KT 4622 11051 

$$

RCG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 6:42 PM MDT	Special Weather Statement	TFX	Cascade	33 min
Jun 3, 7:11 PM MDT	Special Weather Statement	TFX	Cascade	49 min
Jun 3, 7:53 PM MDT	Special Weather Statement	TFX	Judith Basin	52 min
Jun 4, 2:47 PM MDT	Special Weather Statement	TFX	Beaverhead	28 min
Jun 4, 3:10 PM MDT	Special Weather Statement	TFX	Beaverhead	35 min
Jun 4, 3:10 PM MDT	Special Weather Statement	TFX	Meagher	65 min
Jun 4, 3:14 PM MDT	Special Weather Statement	TFX	Beaverhead	31 min
Jun 4, 3:36 PM MDT	Special Weather Statement	TFX	Madison	24 min
Jun 4, 4:03 PM MDT	Special Weather Statement	TFX	Meagher	42 min
Jun 4, 4:10 PM MDT	Special Weather Statement	TFX	Madison	35 min
Jun 4, 4:42 PM MDT	Special Weather Statement	TFX	Wheatland	33 min
Jun 4, 4:56 PM MDT	Special Weather Statement	TFX	Judith Basin	34 min
Jun 4, 5:32 PM MDT	Special Weather Statement	TFX	Gallatin	28 min
Jun 4, 5:52 PM MDT	Special Weather Statement	TFX	Fergus, Judith Basin	53 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.