Alert archive / Montana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Glasgow, MT

June 9, 2021Phillips County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 9, 2021, 6:56 PM MDT for Phillips County, Montana. It was in force for 64 min. 7 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 9, 2021, 6:56 PM MDT (00:56 UTC)
Expired: Jun 9, 2021, 8:00 PM MDT
In force: 64 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 70.0 mph

County Phillips County, MT

The radar

The Glasgow radar (KGGW), 143 km from the middle of the area, began a volume at 00:55 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 9, 7:15 PM MDT	HAIL 1	7 W Landusky, MT	ALSO WIND GUST TO 62 MPH WITH BRIEF HEAVY RAIN.
Jun 9, 7:30 PM MDT	HAIL 2	8 Sw Phillips, MT	TWITTER PHOTO OF HAILSTONES WITH MEASUREMENT. TIME ESTIMATED.
Jun 9, 7:40 PM MDT	HAIL 1.7	Zortman, MT	PHOTO SUBMITTED SHOWING GOLF BALL SIZED HAIL AND SHINGLE DAMAGE. TIME ESTIMATED.
Jun 9, 7:40 PM MDT	HAIL 1.75	Zortman, MT
Jun 9, 7:40 PM MDT	HAIL 3	Zortman, MT	PUBLIC REPORT OF HAIL 2 TO 3 INCHES, POSSIBLY LARGER. SOME PEOPLE AT NEARBY CAMPGROUND ALSO SUSTAINED DAMAGE. BUSTED WINDSHIELDS AND DENTED VEHICLES. NOT VERY WINDY, A LOT OF RAIN. TIME ESTIMATED.
Jun 9, 8:00 PM MDT	HAIL 3	8 E Zortman, MT	TWITTER PHOTO OF HAIL MEASUREMENT. TIME ESTIMATED.
Jun 9, 8:02 PM MDT	HAIL 2.5	8 E Zortman, MT

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 6 storm reports to this severe thunderstorm warning; the first came 19 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 9, 6:42 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.9 hours before the alert went out and 166 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.

740 
WUUS55 KGGW 100056
SVRGGW
MTC071-100200-
/O.NEW.KGGW.SV.W.0026.210610T0056Z-210610T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Glasgow MT
656 PM MDT Wed Jun 9 2021

The National Weather Service in Glasgow has issued a

* Severe Thunderstorm Warning for...
  West central Phillips County in northeastern Montana...

* Until 800 PM MDT.

* At 656 PM MDT, a severe thunderstorm was located 12 miles west of
  Hays, or 17 miles west of Zortman, moving east at 40 mph.

  HAZARD...70 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Zortman, Phillips and Landusky. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4792 10889 4792 10863 4799 10861 4798 10855
      4798 10844 4815 10843 4826 10804 4800 10791
      4782 10889
TIME...MOT...LOC 0056Z 251DEG 34KT 4793 10890 

HAIL...1.25IN
WIND...70MPH
 
$$

NWS Glasgow
TFJ

1 follow-up statement

470 
WWUS55 KGGW 100134
SVSGGW

Severe Weather Statement
National Weather Service Glasgow MT
734 PM MDT Wed Jun 9 2021

MTC071-100200-
/O.CON.KGGW.SV.W.0026.000000T0000Z-210610T0200Z/
Phillips MT-
734 PM MDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR WEST CENTRAL PHILLIPS COUNTY...

At 733 PM MDT, a severe thunderstorm was located over Zortman, moving
east at 35 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Trained weather spotters.

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

Locations impacted include...
Zortman, Phillips and Landusky. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

&&

LAT...LON 4792 10879 4792 10863 4799 10861 4798 10855
      4798 10844 4815 10843 4826 10804 4800 10791
      4784 10877
TIME...MOT...LOC 0133Z 253DEG 30KT 4793 10858 

HAIL...1.25IN
WIND...60MPH
 
$$

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 9, 3:45 PM MDT, 3 hours 11 minutes earlier.

Area forecast discussion, Jun 9, 3:45 PM MDT, 3 hours 11 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
345 PM MDT Wed Jun 9 2021

.DISCUSSION...
Today is the lull between storms, with severe potential once again
Thursday with all modes of severe possible. In addition, locally
heavy rainfall is once again possible Thursday afternoon and
evening. In addition, there's a chance for some severe storms
tonight in the far northern and western portions of the CWA.

Tonight...
Showers and thunderstorms should enter the CWA late this evening
and overnight tonight, with some gusty winds and small hail
possible with any storms that do develop. In addition, the
environmental winds will begin to pick up area-wide, which will be
enough to reach Lake Wind Advisory criteria over Fort Peck Lake.
Some lingering showers and thunder is possible in the northeast
(Daniels and Sheridan Counties) from whatever's left over from
the overnight convection.

Thursday through Friday....
CAMs guidance in fairly good agreement in developing storms
tomorrow afternoon over the eastern half of the CWA in the
ballpark of 3 PM MDT. In addition, storms will be developing over
Central Montana as well, so there will be a dry slot in between
the two areas of convection. The eastern line will move into North
Dakota during the evening while the convection in Central Montana
spreads across the area. WPC has outlooked roughly the eastern
half of the CWA for a marginal risk of excessive rainfall, with a
slight risk roughly east of a Scobey to Wibaux line: this seems
reasonable given the doubleshot of storms this part of the area
should get, and a Flash Flood Watch may be needed in later
forecast packages. SPC has the eastern half of the CWA under an
enhanced risk, with a hatched area for winds and hail (with the
hatched hail area for almost all of the area):
this also is reasonable given the convective parameters that are
setting up. After the storms move out, the gusty environmental
winds will continue into Friday and temperatures will be much
cooler than it was today or what it will be on Thursday.

Saturday and beyond...
Upper level ridging will begin to build in, leading to rising
temperatures through the weekend into early next week. The peak of
the heat currently appears to be Monday and Tuesday. Dry weather
will return as well.

97

&&

.AVIATION...
FLIGHT CONDITIONS: MVFR ceilings possible early this afternoon at
KGGW & KOLF, with VFR at KGDV & KSDY. Periods of MVFR ceilings
are possible again Thursday morning at KGGW, KOLF, & KSDY.

LLWS: Possible overnight tonight just before sunrise at KOLF,
KSDY, and KGDV about 2kft AGL between 30-40 kts from the
southeast.

WINDS: Becoming NE-E 5-15 kts this afternoon. E 15-20 kts
overnight tonight. SE-E 15-25 kts by Thursday afternoon.

SYNOPSIS: Low clouds have been lingering over the area this
morning, impacting KGGW and KOLF. Showers and thunderstorms will
begin to move into the region and and impact the TAF sites in the
afternoon and evening. Another round of severe weather, including
thunderstorm winds and hail, are possible Thursday afternoon and
evening.

97

&&

.FIRE WEATHER...
Before the storms fire up Thursday afternoon and evening, low
humidity values and gusty winds are expected in the southern fire
zones. For Zone 122, the main threat appear to be south of I-94
while areas north of I-94 should have higher relative humidity
values and have less of a fire threat. If any fires do get
started Thursday afternoon, rain from the storms Thursday night
should bring quick rains to these areas.

There could be brief periods of elevated to critical fire weather
conditions on Friday in pockets generally south of the Missouri
River, but questions surrounding how the precipitation between now
and then impacts soil and fuel moistures leave doubt as to whether
or not fire weather conditions will be reached.

97

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Fire Weather Watch from Thursday morning through Thursday
evening for MTZ122-137.

Lake Wind Advisory from 3 AM Thursday to 7 PM MDT Friday For
Fort Peck Lake for Central and Southeast Phillips...Central and
Southern Valley...Garfield...McCone...Petroleum.

&&

weather.gov/glasgow

In the hours before

Local storm report, Jun 9, 1:49 PM MDT, 5 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
149 PM MDT WED JUN 9 2021

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

1015 PM     TSTM WND GST     2 WSW SIDNEY            47.70N 104.20W
06/08/2021  M61 MPH          RICHLAND           MT   AWOS

            CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2
            WSW SIDNEY. AWOS STATION KSDY SIDNEY
            AIRPORT.

&&

PMG

Local storm report, Jun 9, 2:41 PM MDT, 4 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
241 PM MDT WED JUN 9 2021

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

0800 PM     HAIL             9 SE VAN NORMAN         47.26N 106.25W
06/08/2021  M1.75 INCH       GARFIELD           MT   TRAINED SPOTTER

0800 PM     HAIL             17 E COHAGEN            47.05N 106.26W
06/08/2021  M1.00 INCH       GARFIELD           MT   TRAINED SPOTTER

            NICKLE TO QUARTER SIZE HAIL.

&&

Local storm report, Jun 9, 2:45 PM MDT, 4 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
245 PM MDT WED JUN 9 2021

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

0715 PM     HAIL             HELL CREEK REC AREA     47.62N 106.89W
06/08/2021  M1.75 INCH       GARFIELD           MT   TRAINED SPOTTER

&&

Local storm report, Jun 9, 2:49 PM MDT, 4 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
249 PM MDT WED JUN 9 2021

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

0600 PM     HAIL             10 SW CULBERTSON        48.04N 104.67W
06/08/2021  M2.00 INCH       RICHLAND           MT   PUBLIC

&&

Local storm report, Jun 9, 3:26 PM MDT, 3 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
326 PM MDT WED JUN 9 2021

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

0825 PM     FLASH FLOOD      3 ENE OSWEGO            48.07N 105.83W
06/08/2021                   ROOSEVELT          MT   DEPT OF HIGHWAYS

            WATER GOING 1 FT OVER US HIGHWAY #2 FOR
            APPROXIMATELY A MILE.

&&

GAH

Local storm report, Jun 9, 3:30 PM MDT, 3 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
330 PM MDT WED JUN 9 2021

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

0835 PM     FLASH FLOOD      14 SE VOLT              48.27N 105.48W
06/08/2021                   ROOSEVELT          MT   PUBLIC

            TWO SPOTS ON MT HIGHWAY-13N AT MILE MARKERS
            11.5 AND 12.5 HAD WATER GOING OVER THE ROAD,
            IN AREAS WITH DEEP COULEES. A RANCHER IN THE
            AREA STATED HE HAD NEVER SEEN WATER OVER THE
            ROAD IN THESE LOCATIONS IN HIS 85 YEARS.

&&

GAH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 7:51 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	54 min
Jun 9, 8:30 PM MDT	Special Weather Statement	GGW		45 min
Jun 9, 8:33 PM MDT	Special Weather Statement	GGW	Petroleum	42 min
Jun 9, 8:44 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	61 min
Jun 9, 9:18 PM MDT	Special Weather Statement	GGW		42 min
Jun 9, 9:32 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum, Phillips	58 min
Jun 9, 10:16 PM MDT	Special Weather Statement	GGW	Phillips	44 min
Jun 9, 10:25 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum, Phillips	65 min
Jun 9, 10:37 PM MDT	Special Weather Statement	GGW		38 min
Jun 9, 10:38 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	67 min
Jun 9, 11:28 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	25 min
Jun 9, 11:56 PM MDT	Special Weather Statement	GGW	Phillips	94 min
Jun 10, 3:47 AM MDT	Red Flag Warning	GGW	Dawson, McCone, Prairie, Richland, Wibaux	16 hr
Jun 10, 2:32 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland	16 min
Jun 10, 3:14 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Roosevelt, Sheridan	61 min
Jun 10, 3:27 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum	63 min
Jun 10, 3:31 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt, Sheridan	59 min
Jun 10, 3:41 PM MDT	Tornado Warning	GGW	Richland	34 min
Jun 10, 4:05 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, Petroleum	55 min
Jun 10, 4:12 PM MDT	Tornado Warning	GGW	Richland, Roosevelt	33 min
Jun 10, 4:22 PM MDT	Special Weather Statement	GGW		38 min
Jun 10, 4:23 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	67 min
Jun 10, 4:38 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt, Wibaux	45 min
Jun 10, 5:21 PM MDT	Special Weather Statement	GGW	Garfield	39 min
Jun 10, 5:44 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	61 min
Jun 10, 5:54 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	66 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.