Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Glasgow, MT

June 10, 2021Dawson County, McCone County, Richland County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 10, 2021, 8:23 PM MDT for Dawson County, McCone County, Richland County, Montana. It was in force for 67 min. 19 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, 2021, 8:23 PM MDT (02:23 UTC)
Expired: Jun 10, 2021, 9:30 PM MDT
In force: 67 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 2.5 in
Wind: 70.0 mph

Counties Dawson County, MT, McCone County, MT, Richland County, MT

The radar

The Glasgow radar (KGGW), 159 km from the middle of the area, began a volume at 02:26 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, 8:31 PM MDT	TSTM WND GST 90	Circle, MT	TIME ESTIMATED FROM RADAR. FROM SOCIAL MEDIA.
Jun 10, 8:35 PM MDT	HAIL 1	8 Nne Lindsay, MT	DIME TO QUARTER-SIZED HAIL. 0.13 INCHES OF RAIN MEASURED.
Jun 10, 8:37 PM MDT	TSTM WND DMG	2 W Bloomfield, MT	3 FOOT SOFFITTING TORN OFF NORTHWEST CORNER OF HOUSE. DOWN TREE LIMBS AND A DEAD TREE. TIME ESTIMATED FROM RADAR. FROM SOCIAL MEDIA.
Jun 10, 8:37 PM MDT	HAIL 1.75	2 W Bloomfield, MT	PEA TO GOLF BALL SIZED HAIL, TIME BASED ON RADAR. 0.67 INCHES OF RAIN THROUGH FRIDAY MORNING. FROM SOCIAL MEDIA.
Jun 10, 8:38 PM MDT	TSTM WND GST 79	8 Nne Circle, MT	THIS GUST IS LIKELY ENHANCED BY THE COLD FRONT COMING THROUGH AS WELL, THE STORM IS MOSTLY SOUTH OF THIS AREA.
Jun 10, 8:42 PM MDT	TSTM WND DMG	11 W Bloomfield, MT	THUNDERSTORM WINDS BROKE WINDOWS, DAMAGED CROPS AND GARDEN, AND TOPPLED PINE TREES. FROM SOCIAL MEDIA.
Jun 10, 8:42 PM MDT	HAIL 1.25	1 N Lindsay, MT	NICKEL TO HALF DOLLAR SIZED HAIL ACCOMPANIED BY STRONG WINDS. FROM SOCIAL MEDIA.
Jun 10, 8:42 PM MDT	NON-TSTM WND DMG	7 Nnw Bloomfield, MT	CORRECTS PREVIOUS NON-TSTM WND DMG REPORT FROM 7 NNW BLOOMFIELD. MULTIPLE TREES DOWN, ONE OF WHICH BROKE THROUGH A HOUSE WINDOW.
Jun 10, 8:45 PM MDT	HAIL 1	8 S Richey, MT	GROUND WHITE WITH HAIL ONGOING- UP TO QUARTER SIZE.
Jun 10, 8:48 PM MDT	TSTM WND GST 70	8 S Richey, MT	ESTIMATED 70 MPH WIND GUST WITH TREE BRANCHES DOWN.
Jun 10, 9:00 PM MDT	TSTM WND DMG	12 N Lambert, MT	NUMEROUS POWER POLES FROM COUNTY ROAD 201 SOUTHWARD ON COUNTY ROAD 328 WERE SNAPPED AT THEIR BASES FOR UP TO 6 MILES ALONG THE ROAD. THERE WERE A FEW SNAPPED ABOUT 1/3 OF THE WAY UP, BUT 98% WERE AT THE BASES. WIND SPEED ESTIMATES ARE 95 TO 100 MPH.
Jun 10, 9:00 PM MDT	TSTM WND GST 66	1 Ssw Midway, MT	MESONET STATION DW8636 SIDNEY.
Jun 10, 9:00 PM MDT	TSTM WND GST 66	4 Wnw Midway, MT	MESONET STATION FW8536 SAVAGE.
Jun 10, 9:00 PM MDT	TSTM WND GST 75	8 S Richey, MT	ESTIMATED WINDS OF OVER 70 MPH WITH TREES THAT HAVE LOST LEAVES AND WINDOWS OUT.
Jun 10, 9:00 PM MDT	HAIL 1	8 S Richey, MT	ESTIMATED HAIL AROUND A QUARTER SIZE.
Jun 10, 9:05 PM MDT	TSTM WND DMG	Lambert, MT	SEVERAL BUILDINGS IN THE COMMUNITY OF LAMBERT, MT SUSTAINED DAMAGE DUE TO SEVERE THUNDERSTORM WINDS AND VERY LARGE HAIL. MOST HOMES WERE NEWER AND WELL BUILT. SOME SIDING WAS STRIPPED FROM THE SOUTHWEST CORNERS OF BUILDINGS. VINYL SIDING TOOK A HIT FROM STRONG
Jun 10, 9:05 PM MDT	HAIL 1	Lambert, MT	VINYL SIDING ON SEVERAL HOMES TOOK A HIT FROM STRONG WINDS (MEASURED NEARBY AT 71 MPH) AND HAIL THAT WAS AT LEAST ONE INCH IN DIAMETER AND MAYBE GREATER.
Jun 10, 9:10 PM MDT	TSTM WND GST 70	1 Ne Lambert, MT	MESONET STATION DW8633 LAMBERT.
Jun 10, 9:24 PM MDT	TSTM WND GST 74	Sidney, MT	ESTIMATED HURRICANE FORCE WINDS.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 18 storm reports to this severe thunderstorm warning; the first came 8 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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, 2:30 PM MDT	Tornado Watch	SPC	6 hr
Jun 10, 2:52 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.4 hours before the alert went out and 158 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: 1762 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 1872 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

526 
WUUS55 KGGW 110223
SVRGGW
MTC021-055-083-110330-
/O.NEW.KGGW.SV.W.0047.210611T0223Z-210611T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Glasgow MT
823 PM MDT Thu Jun 10 2021

The National Weather Service in Glasgow has issued a

* Severe Thunderstorm Warning for...
  Southeastern McCone County in northeastern Montana...
  Northern Dawson County in northeastern Montana...
  Central Richland County in northeastern Montana...

* Until 930 PM MDT.

* At 822 PM MDT, severe thunderstorms were located along a line
  extending from near Circle to near Lindsay, moving northeast at 50
  mph.

  HAZARD...Tennis ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  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...
  Sidney, Circle, Richey, Lambert, Bloomfield, Savage, Lindsay, Enid,
  Midway and Crane.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM MDT for northeastern
Montana.

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

&&

LAT...LON 4715 10507 4736 10584 4791 10475 4771 10404
      4754 10405
TIME...MOT...LOC 0222Z 236DEG 46KT 4737 10568 4721 10511 

HAIL...2.50IN
WIND...70MPH
 
$$

NWS Glasgow
TFJ

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 10, 4:13 PM MDT, 4 hours 10 minutes earlier.

Area forecast discussion, Jun 10, 4:13 PM MDT, 4 hours 10 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
413 PM MDT Thu Jun 10 2021

.DISCUSSION...
Update: This Afternoon and tonight.

There is a Tornado Watch out for our eastern counties and Severe
Thunderstorm Watch out for the rest of the area.

Plenty of lift as an upper level jet and shortwave trough lift
across the area tonight. Moisture, instability and shear
available for rapid thunderstorm development over all of NE MT
this afternoon and into this evening. Most of the activity will
begin to move off to the east in to the Dakotas by around
midnight.

Tornado Threat:
For Sheridan, Daniels, Roosevelt, Richland, and Wibaux there is
enough shear and instability that there is a Tornado Watch in
effect through 900 pm mdt. Possible tornadoes, severe wind gusts,
and large hail 1-3 inches possible.

Severe Thunderstorm Threat:
For Phillips, Petroleum, Garfield, Valley, McCone, Dawson, and
Prairie there is a Severe Thunderstorm Watch in effect until 10 pm
MDT. This area has enough shear, instability, and a slightly drier
atmosphere will produce the main threat for severe wind gusts and
large hail.
Friday, a cooler, post-frontal, drier environment will be in place
with persistent gusty west winds, keeping the need for the current
Lake Wind Advisory in place.

By Friday night, the main active and forcing mechanisms will be
past and calmer conditions will return, allbeit under a building
broad ridge of high pressure from the south.

This will allow for a period of hot and dry weather to prevail
this weekend and into next week.
&&

.AVIATION...

FLIGHT CONDITIONS: Severe Thunderstorm Watch in effect until 1000
pm mdt & Tornado Watch in effect until 900 pm mdt covering all of
NE MT. IFR to LIFR briefly as multiple thunderstorms sweep
through the region during the afternoon and evening hours. All
summertime severe weather threats will be possible. Expect
amendments.

LLWS: Possible due to severe thunderstorms.

WINDS: Winds SE 25-30kts along the MT/ND border through 00z then
shifting to W-SW at 15-20kts through 06z then W-NW 15 to 25 kts through
the remainder of the period as the front sweep across the
remainder of the area overnight.

SYNOPSIS: The weather pattern and ingredients have come together
for severe thunderstorms and possible tornadoes this afternoon
and evening. All summertime severe weather threats are possible,
large hail from 1-3", thunderstorm wind gust possible from from 45-60
kts, and possible tornadoes.
&&

.FIRE WEATHER...
Red Flag Warning through 800 pm MDT this evening due to low
humidities and strong gusty winds for fire weather zones 122 to
include the following counties; McCone; Dawson; Richland Prairie;
and Wibaux counties. A trough of low pressure is forecast to move
across the area creating an environment conducive for severe
thunderstorms. Expect frequent lightning, strong microburst winds,
and hail from these storms. As the trough moves NE across the
area this evening, low RH will wrap NNE across the warning area as
a dryline pushes east through the warned area. A cold front will
move through the area by around midnight tonight bringing cooler
conditions, breezy NW winds and higher RH values.

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 7 PM MDT Friday For Fort Peck Lake for
Central and Southeast Phillips...Central and Southern Valley...
Garfield...McCone...Petroleum.

Red Flag Warning until 8 PM MDT this evening for MTZ122.

&&

weather.gov/glasgow

In the hours before

Special weather statement, Jun 10, 6:54 PM MDT, 1 hour 29 minutes before

Special Weather Statement
National Weather Service Glasgow MT
654 PM MDT Thu Jun 10 2021

MTZ022-026-110145-
Garfield MT-Prairie MT-
654 PM MDT Thu Jun 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GARFIELD AND WEST
CENTRAL PRAIRIE COUNTIES UNTIL 745 PM MDT...

At 653 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 16 miles south of Sand Springs to 23 miles
south of Hillside. Movement was northeast at 45 mph.

Half inch hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Cohagen, Hillside and Crow Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northeastern Montana.

LAT...LON 4674 10558 4675 10562 4683 10562 4683 10583
      4686 10584 4684 10672 4686 10747 4688 10754
      4720 10676 4676 10539 4671 10558
TIME...MOT...LOC 0053Z 243DEG 38KT 4689 10736 4657 10636

NWS Glasgow
TFJ

Local storm report, Jun 10, 7:49 PM MDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
749 PM MDT THU JUN 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     TSTM WND DMG     8 WSW CROW ROCK         46.87N 106.23W
06/10/2021                   GARFIELD           MT   TRAINED SPOTTER

            WEAKER TREE AT LEAST A FOOT IN DIAMETER
            FELL. DRIFTING HAIL ESTIMATED AS PEA SIZE.

&&

JEZ

Local storm report, Jun 10, 8:03 PM MDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
803 PM MDT THU JUN 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0755 PM     HAIL             10 WNW MCCLOUD          46.95N 105.80W
06/10/2021  E3.00 INCH       PRAIRIE            MT   TRAINED SPOTTER

            3 INCH HAIL AND TORRENTIAL RAINFALL.

&&

Local storm report, Jun 10, 8:04 PM MDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
804 PM MDT THU JUN 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0755 PM     TSTM WND DMG     10 WNW MCCLOUD          46.95N 105.80W
06/10/2021                   PRAIRIE            MT   TRAINED SPOTTER

            ASH TREES BROKEN ABOUT HALFWAY UP. APPLE
            TREES AND AN 80-YEAR-OLD SPRUCE TREE BLOWN
            DOWN.

&&

Local storm report, Jun 10, 8:17 PM MDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
817 PM MDT THU JUN 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 PM     HAIL             19 NW TERRY             46.99N 105.60W
06/10/2021  M2.00 INCH       PRAIRIE            MT   TRAINED SPOTTER

&&

Local storm report, Jun 10, 8:19 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
819 PM MDT THU JUN 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0808 PM     TSTM WND GST     13 NW MCCLOUD           47.03N 105.80W
06/10/2021  M59 MPH          PRAIRIE            MT   MESONET

            MESONET STATION LCFM8 MCCLOUD 13WNW/BIG
            SHEEP MTN.

&&

JEZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 6:24 PM MDT	Areal Flood Advisory	GGW	Richland, Wibaux	2 hr
Jun 10, 6:40 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	65 min
Jun 10, 6:54 PM MDT	Special Weather Statement	GGW	Garfield	51 min
Jun 10, 7:22 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	53 min
Jun 10, 7:30 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie	60 min
Jun 10, 7:42 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	40 min
Jun 10, 7:52 PM MDT	Tornado Warning	GGW	Daniels, Roosevelt, Valley	26 min
Jun 10, 7:57 PM MDT	Areal Flood Advisory	GGW	Daniels, Roosevelt, Valley	98 min
Jun 10, 8:09 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan, Valley	32 min
Jun 10, 8:37 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Valley	33 min
Jun 10, 9:03 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	57 min
Jun 10, 9:05 PM MDT	Special Weather Statement	GGW	Daniels, Roosevelt, Sheridan	40 min
Jun 10, 9:15 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt	60 min
Jun 10, 9:48 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan	57 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.