Alert archive / Montana / Tornado Warnings in 2021

Tornado Warning 1, NWS Great Falls, MT

July 6, 2021Blaine County, Montana

NWS Great Falls, MT issued this tornado warning at Jul 6, 2021, 8:20 PM MDT for Blaine County, Montana. It was in force for 25 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: Jul 6, 2021, 8:20 PM MDT (02:20 UTC)
Expired: Jul 6, 2021, 8:45 PM MDT
In force: 25 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 138 km from the middle of the area, began a volume at 02:21 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 nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.3 hours before the alert went out and 140 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: 20 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1401 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

492 
WFUS55 KTFX 070220
TORTFX
MTC005-070245-
/O.NEW.KTFX.TO.W.0001.210707T0220Z-210707T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Great Falls MT
820 PM MDT Tue Jul 6 2021

The National Weather Service in Great Falls has issued a

* Tornado Warning for...
  East central Blaine County in north central Montana...

* Until 845 PM MDT.
    
* At 820 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles east of Fort Belknap, or 31 miles east of
  Chinook, moving southeast at 30 mph.

  HAZARD...Tornado and golf ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  east central Blaine County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4844 10842 4823 10842 4819 10844 4854 10877
      4865 10852 4853 10834 4844 10835
TIME...MOT...LOC 0220Z 320DEG 27KT 4853 10856 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RCG

2 follow-up statements

044 
WWUS55 KTFX 070232
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
832 PM MDT Tue Jul 6 2021

MTC005-070245-
/O.CON.KTFX.TO.W.0001.000000T0000Z-210707T0245Z/
Blaine MT-
832 PM MDT Tue Jul 6 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR EAST
CENTRAL BLAINE COUNTY...
    
At 831 PM MDT, a severe thunderstorm capable of producing a tornado
was located 11 miles northwest of Dodson, or 28 miles west of Malta,
moving southeast at 30 mph.

HAZARD...Tornado and golf ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will be crossing US highway 2 east of 
Fort Belknap.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4844 10842 4823 10842 4819 10844 4846 10869
      4857 10846 4850 10835 4844 10835
TIME...MOT...LOC 0231Z 320DEG 27KT 4846 10848 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RCG

965 
WWUS55 KTFX 070240
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
840 PM MDT Tue Jul 6 2021

MTC005-070245-
/O.CON.KTFX.TO.W.0001.000000T0000Z-210707T0245Z/
Blaine MT-
840 PM MDT Tue Jul 6 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR EAST
CENTRAL BLAINE COUNTY...
    
At 839 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles west of Dodson, or 25 miles west of Malta, moving
southeast at 30 mph.

HAZARD...Tornado and golf ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will cross US highway 2 east of Fort 
Belknap.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4844 10842 4823 10842 4819 10844 4842 10865
      4852 10846 4847 10839 4844 10835
TIME...MOT...LOC 0239Z 320DEG 27KT 4841 10842 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

RCG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 6:14 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	29 min
Jul 6, 6:16 PM MDT	Special Weather Statement	TFX	Toole	29 min
Jul 6, 6:50 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	40 min
Jul 6, 6:57 PM MDT	Special Weather Statement	TFX	Toole	33 min
Jul 6, 7:27 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	63 min
Jul 6, 7:30 PM MDT	Special Weather Statement	TFX	Liberty	30 min
Jul 6, 8:45 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	19 min
Jul 7, 1:51 PM MDT	Special Weather Statement	TFX	Beaverhead	39 min
Jul 7, 2:03 PM MDT	Special Weather Statement	TFX	Judith Basin	27 min
Jul 7, 2:18 PM MDT	Special Weather Statement	TFX	Fergus	27 min
Jul 7, 2:43 PM MDT	Special Weather Statement	TFX	Fergus	32 min
Jul 7, 2:46 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	29 min
Jul 7, 2:55 PM MDT	Special Weather Statement	TFX	Madison	50 min
Jul 7, 3:06 PM MDT	Special Weather Statement	TFX	Jefferson	54 min
Jul 7, 3:13 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	47 min
Jul 7, 3:21 PM MDT	Special Weather Statement	TFX	Fergus	24 min
Jul 7, 3:26 PM MDT	Severe Thunderstorm Warning	TFX	Jefferson, Lewis and Clark	34 min
Jul 7, 3:36 PM MDT	Special Weather Statement	TFX	Fergus	24 min
Jul 7, 3:40 PM MDT	Special Weather Statement	TFX	Lewis and Clark	35 min
Jul 7, 3:46 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson	44 min
Jul 7, 3:55 PM MDT	Special Weather Statement	TFX	Gallatin	50 min
Jul 7, 3:59 PM MDT	Special Weather Statement	TFX	Fergus	46 min
Jul 7, 4:02 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson	43 min
Jul 7, 4:30 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	30 min
Jul 7, 4:36 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	15 min
Jul 7, 4:48 PM MDT	Special Weather Statement	TFX	Silver Bow	27 min
Jul 7, 4:56 PM MDT	Special Weather Statement	TFX	Meagher	34 min
Jul 7, 5:12 PM MDT	Special Weather Statement	TFX	Judith Basin	48 min
Jul 7, 5:13 PM MDT	Special Weather Statement	TFX	Blaine	62 min
Jul 7, 5:38 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	37 min
Jul 7, 5:56 PM MDT	Special Weather Statement	TFX	Blaine	34 min

Nearby

Tornado Warnings in Montana, 2021 Every tornado warning in 2021 Tornadoes 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.