Alert archive / Montana / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 21, NWS Great Falls, MT

June 10, 2016Blaine County, Chouteau County, Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 10, 2016, 4:30 PM MDT for Blaine County, Chouteau County, Fergus County, Montana. It was in force for 60 min. 4 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 10, 2016, 4:30 PM MDT (22:30 UTC)
Expired: Jun 10, 2016, 5:30 PM MDT
In force: 60 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

Counties Blaine County, MT, Chouteau County, MT, Fergus County, MT

The radar

The Great Falls radar (KTFX), 106 km from the middle of the area, began a volume at 22:30 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 10, 4:38 PM MDT	HAIL 1.75	3 Se Square Butte, MT
Jun 10, 4:45 PM MDT	HAIL 2	Sw Square Butte, MT	ESTIMATED HAIL FALLING UP TO 2 INCHES IN DIAMETER.
Jun 10, 5:17 PM MDT	HAIL 1.75	12 W Winifred, MT
Jun 10, 5:17 PM MDT	HAIL 2	10 W Winifred, MT

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 10, 3:06 PM MDT	Severe Thunderstorm Watch	SPC	11 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 49 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2289 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

577 
WUUS55 KTFX 102230
SVRTFX
MTC005-015-027-102330-
/O.NEW.KTFX.SV.W.0021.160610T2230Z-160610T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
430 PM MDT FRI JUN 10 2016

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA...
  SOUTHWESTERN BLAINE COUNTY IN NORTH CENTRAL MONTANA...
  NORTHWESTERN FERGUS COUNTY IN CENTRAL MONTANA...

* UNTIL 530 PM MDT

* AT 430 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES
  SOUTHEAST OF GERALDINE...OR 26 MILES NORTH OF STANFORD...MOVING
  EAST AT 30 MPH.

  HAZARD...GOLF BALL SIZE HAIL AND 70 MPH WIND GUSTS. 

  SOURCE...TRAINED WEATHER SPOTTERS. 

  IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL 
           DAMAGE TO ROOFS...SIDING...WINDOWS...AND VEHICLES. EXPECT 
           CONSIDERABLE TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO 
           MOBILE HOMES...ROOFS...AND OUTBUILDINGS. 

* LOCATIONS IMPACTED INCLUDE...
  GERALDINE...ILIAD...SQUARE BUTTE AND JUDITH LANDING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE IMMEDIATELY TO SHELTER INSIDE A STRONG BUILDING. STAY
AWAY FROM WINDOWS.

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4744 11025 4771 11036 4800 10962 4746 10945
TIME...MOT...LOC 2230Z 249DEG 27KT 4752 11014 

HAIL...1.75IN
WIND...70MPH
 
$$

MARTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 3:03 PM MDT	Special Weather Statement	TFX	Chouteau	42 min
Jun 10, 3:20 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	25 min
Jun 10, 3:45 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Fergus	45 min
Jun 10, 4:08 PM MDT	Special Weather Statement	TFX	Glacier	37 min
Jun 10, 4:21 PM MDT	Special Weather Statement	TFX	Cascade	39 min
Jun 10, 4:37 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	38 min
Jun 10, 4:42 PM MDT	Tornado Warning	TFX	Chouteau, Fergus	33 min
Jun 10, 5:14 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus, Judith Basin	46 min
Jun 10, 5:17 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	43 min
Jun 10, 5:19 PM MDT	Special Weather Statement	TFX	Cascade	26 min
Jun 10, 5:39 PM MDT	Special Weather Statement	TFX		36 min

Nearby

Severe Thunderstorm Warnings in Montana, 2016 Every severe thunderstorm warning in 2016

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.