Severe Thunderstorm Warning 43, NWS Great Falls, MT

Issued

Jul 20, 2021, 6:48 PM MDT (00:48 UTC)

Expired

Jul 20, 2021, 7:15 PM MDT

In force

27 min

Issued by

NWS Great Falls, MT

Area

Storm-based polygon

Hail

0.75 in

Wind

60.0 mph

Counties Pondera County, MT, Teton County, MT

The Great Falls radar (KTFX), 66 km from the middle of the area, began a volume at 00:51 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.

084 
WUUS55 KTFX 210048
SVRTFX
MTC073-099-210115-
/O.NEW.KTFX.SV.W.0043.210721T0048Z-210721T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
648 PM MDT Tue Jul 20 2021

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Pondera County in north central Montana...
  Central Teton County in north central Montana...

* Until 715 PM MDT.

* At 647 PM MDT, a severe thunderstorm was located over Choteau,
  moving east at 20 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Choteau, Farmington and Collins. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4772 11220 4789 11230 4805 11188 4780 11173
TIME...MOT...LOC 0047Z 248DEG 18KT 4784 11215 

HAIL...0.75IN
WIND...60MPH
 
$$

SC

119 
WWUS55 KTFX 210105
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
705 PM MDT Tue Jul 20 2021

MTC073-099-210115-
/O.CON.KTFX.SV.W.0043.000000T0000Z-210721T0115Z/
Pondera MT-Teton MT-
705 PM MDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR SOUTHEASTERN PONDERA AND NORTHEASTERN TETON COUNTIES...

At 704 PM MDT, a severe thunderstorm was located 8 miles northeast of
Choteau, moving east at 20 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Collins.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4776 11200 4795 11213 4805 11188 4780 11173
TIME...MOT...LOC 0104Z 248DEG 18KT 4787 11203 

HAIL...0.75IN
WIND...60MPH
 
$$

SC

881 
WWUS55 KTFX 210115
SVSTFX

Severe Weather Statement
National Weather Service Great Falls MT
715 PM MDT Tue Jul 20 2021

MTC073-099-210125-
/O.EXP.KTFX.SV.W.0043.000000T0000Z-210721T0115Z/
Pondera MT-Teton MT-
715 PM MDT Tue Jul 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PONDERA AND
NORTHEASTERN TETON COUNTIES HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 4776 11200 4795 11213 4805 11188 4780 11173
TIME...MOT...LOC 0115Z 248DEG 18KT 4789 11197 

$$

SC

Severe Thunderstorm Warnings in Montana, 2021Every severe thunderstorm warning in 2021

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.