Special Weather Statement, NWS Great Falls, MT

Issued

Aug 6, 2020, 5:20 PM MDT (23:20 UTC)

Expired

Aug 6, 2020, 5:45 PM MDT

In force

25 min

Issued by

NWS Great Falls, MT

Counties Jefferson County, MT, Lewis and Clark County, MT

The Great Falls radar (KTFX), 121 km from the middle of the area, began a volume at 23:22 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.

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

102 
WWUS85 KTFX 062320
SPSTFX

Special Weather Statement
National Weather Service Great Falls MT
520 PM MDT Thu Aug 6 2020

MTZ014-052-053-062345-
Broadwater-Jefferson-Central and Southern Lewis and Clark-
520 PM MDT Thu Aug 6 2020

...A BROKEN LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN LEWIS 
AND CLARK...SOUTHWESTERN BROADWATER...AND JEFFERSON COUNTIES...

At 518 PM MDT, radar indicated strong thunderstorms were located
along a line extending from near Lincoln to near Boulder. Movement
was east at 45 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Helena, Townsend, Boulder, Lincoln, East Helena, Whitehall, Montana
City, Basin, Wolf Creek, Toston, Rimini, Alhambra, Corbin, Spring
Meadow Lake State Park, Austin, Winston, Radersburg, Silos, Clancy
and Jefferson City.

This includes the following highways...
 Interstate 15 between mile markers 142 and 229.
 Interstate 90 between mile markers 241 and 255.
 Highway 200 between mile markers 69 and 106.

Cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4733 11230 4733 11226 4617 11138 4585 11200
      4585 11209 4575 11218 4634 11250 4633 11246
      4641 11232 4665 11231 4666 11241 4670 11242
      4670 11253 4684 11254 4683 11277 4690 11280
TIME...MOT...LOC 2318Z 257DEG 38KT 4696 11262 4627 11207 

$$

RCG

Special Weather Statements in Montana, 2020Every special weather statement in 2020

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.