Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Great Falls, MT

June 24, 2021Fergus County, Judith Basin County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 24, 2021, 4:29 PM MDT for Fergus County, Judith Basin County, Montana. It was in force for 31 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: Jun 24, 2021, 4:29 PM MDT (22:29 UTC)
Expired: Jun 24, 2021, 5:00 PM MDT
In force: 31 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Fergus County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 138 km from the middle of the area, began a volume at 22:32 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 24, 4:40 PM MDT	TSTM WND GST 60	4 S Hobson, MT	STRONG WIND GUSTS ESTIMATED AROUND 60MPH WITH SUSTAINED AROUND 30 TO 40 MPH.
Jun 24, 4:40 PM MDT	HAIL 1.25	4 S Hobson, MT	1 TO 1.25 INCH HAIL REPORTED SOUTH OF HOBSON NEAR BLACK BULL RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 94 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: 10 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 2437 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

208 
WUUS55 KTFX 242229
SVRTFX
MTC027-045-242300-
/O.NEW.KTFX.SV.W.0015.210624T2229Z-210624T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
429 PM MDT Thu Jun 24 2021

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Judith Basin County in central Montana...
  Southwestern Fergus County in central Montana...

* Until 500 PM MDT.

* At 427 PM MDT, a severe thunderstorm was located 9 miles south of
  Hobson, or 23 miles southeast of Stanford, moving southeast at 30
  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...
  Ackley Lake State Park, Buffalo and Garneill. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...
Large hail and damaging winds and continuous 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.

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 4669 10975 4670 10982 4675 10998 4686 11011
      4702 10994 4684 10957
TIME...MOT...LOC 2227Z 311DEG 26KT 4687 10993 

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

TPP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 2:05 PM MDT	Special Weather Statement	TFX	Cascade	40 min
Jun 24, 3:57 PM MDT	Special Weather Statement	TFX	Teton	33 min
Jun 24, 4:07 PM MDT	Special Weather Statement	TFX	Meagher	23 min
Jun 24, 4:25 PM MDT	Special Weather Statement	TFX	Teton	35 min
Jun 24, 4:55 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	35 min
Jun 24, 5:16 PM MDT	Special Weather Statement	TFX	Fergus	44 min
Jun 24, 5:29 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	31 min
Jun 24, 5:59 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.