Alert archive / Montana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 10, NWS Great Falls, MT

June 5, 2023Cascade County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 5, 2023, 7:19 PM MDT for Cascade County, Montana. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 5, 2023, 7:19 PM MDT (01:19 UTC)
Expired: Jun 5, 2023, 7:49 PM MDT
In force: 30 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Cascade County, MT

The radar

The Great Falls radar (KTFX), 17 km from the middle of the area, began a volume at 01:20 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 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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 5, 5:12 PM MDT, 2 hours 7 minutes earlier.

Area forecast discussion, Jun 5, 5:12 PM MDT, 2 hours 7 minutes before

Area Forecast Discussion
National Weather Service Great Falls MT
512 PM MDT Mon Jun 5 2023

...Aviation Section Updated...

.SYNOPSIS...
Showers and thunderstorms will diminish overnight, while a Canadian
cold front moves southward into North Central MT on Tuesday morning.
Temperatures will be cooler over North Central MT on Tuesday, but
warm air returns on Wednesday. Additionally, some storms could
produce heavy rain at times, especially later this week.

&&

.DISCUSSION...
Tonight through Tuesday...Main concern this evening is
thunderstorm and flash flood potential. Strong storms currently
over Central MT continue to slowly move to the north. Initially
the storms will be capable of hail/gusty winds...but then
transition into heavy rain producing storms as they slowly move
northward. An isolated severe or flash flood warning is possible,
mostly over North Central MT until about 10 PM this evening. Late
tonight, a Canadian cold front will move southward into North
Central MT, resulting in light showers and a wind shift to the
north over North Central MT. With some breaks in the cloud cover,
afternoon temperatures should reach the mid 60s over North
Central MT, but they might be adjusted lower overnight should the
cloud cover linger longer during the day.

Wednesday through Monday...An unstable air mass will continue to
reside over MT through the upcoming weekend. An upper level ridge
will try to build over central Canada, resulting in a
southeasterly flow aloft over MT. This will result in daily
chances of showers/thunderstorms over are our area. Additionally,
with high precipitable water, there are concerns for increased
storms that will produce heavy rain on Thu/Fri. Thur/Fri has the
highest chance of 1 inch of rainfall over Central MT near 40
percent. Brusda

&&

.AVIATION...
512 PM MDT Mon Jun 5 2023 (06/00Z TAF Period)

Main concern continues to be scattered thunderstorms for this
evening. IFR conditions are possible for a short time during strong
storms from about 19z to 03z Tue. Storms decrease overnight, but a
cold front will move southward from Canada on Tuesday morning,
bringing low clouds, light rain showers and a wind shift to the
north over much of North Central MT. Mountains/passes will be
obscured at times through the period. Brusda/Webb

Refer to weather.gov/zlc for more detailed regional aviation
weather and hazard information.

&&

.HYDROLOGY...
The Flood Advisory for portions of northern Madison County has been
extended into Tuesday afternoon. Small creeks flowing out of the
Tobacco Root Mountains continue to cause minor flooding impacts for
this area, including sections of state route 283 near Pony.

Showers and thunderstorms are expected most days this week.
Precipitable water increases significantly by the middle portion
of the week, going to around 1.50 inches, but not overly
high for this time of year. Thus the chances for flood highlights
will increase throughout the week as well, including flash flood
highlights. Some river flooding can not be ruled out either.
Brusda

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  54  68  53  78 /  80  40  10  40
CTB  50  67  48  79 /  60  30   0  20
HLN  55  73  55  81 /  60  40  20  50
BZN  49  78  50  79 /  40  40  20  50
WYS  39  76  41  74 /  10  40  20  70
DLN  48  76  50  78 /  40  30  20  60
HVR  58  73  54  80 /  70  50  10  20
LWT  53  71  52  76 /  40  60  30  60

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
None.

&&

http://www.weather.gov/greatfalls

In the hours before

Local storm report, Jun 5, 6:36 PM MDT, 43 minutes before

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Local storm report, Jun 5, 6:38 PM MDT, 41 minutes before

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Special weather statement, Jun 5, 6:41 PM MDT, 38 minutes before

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Special weather statement, Jun 5, 6:46 PM MDT, 33 minutes before

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Special weather statement, Jun 5, 7:15 PM MDT, 4 minutes before

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Local storm report, Jun 5, 7:17 PM MDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 6:41 PM MDT	Special Weather Statement	TFX	Cascade	34 min
Jun 5, 6:46 PM MDT	Special Weather Statement	TFX	Liberty	29 min
Jun 5, 7:06 PM MDT	Areal Flood Advisory	TFX	Cascade	114 min
Jun 5, 7:15 PM MDT	Special Weather Statement	TFX	Cascade	45 min
Jun 5, 7:53 PM MDT	Special Weather Statement	TFX	Judith Basin	37 min
Jun 5, 8:10 PM MDT	Special Weather Statement	TFX	Gallatin	50 min
Jun 5, 8:23 PM MDT	Areal Flood Advisory	TFX	Cascade, Judith Basin	112 min
Jun 5, 9:00 PM MDT	Special Weather Statement	TFX	Gallatin	30 min
Jun 5, 9:10 PM MDT	Special Weather Statement	TFX	Chouteau	50 min
Jun 5, 9:42 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	48 min
Jun 5, 10:28 PM MDT	Areal Flood Advisory	TFX	Cascade, Chouteau, Fergus, Judith Basin	3 hr
Jun 5, 10:31 PM MDT	Special Weather Statement	TFX		29 min
Jun 5, 10:51 PM MDT	Special Weather Statement	TFX	Judith Basin	39 min
Jun 5, 11:26 PM MDT	Areal Flood Advisory	TFX	Blaine, Chouteau, Fergus	2 hr
Jun 6, 12:41 PM MDT	Flood Watch	TFX	Beaverhead, Blaine, Broadwater, Cascade, Chouteau, Fergus and 12 more	4 days
Jun 6, 1:14 PM MDT	Special Weather Statement	TFX	Blaine	46 min
Jun 6, 1:19 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	28 min
Jun 6, 1:23 PM MDT	Areal Flood Advisory	TFX	Blaine	3 hr
Jun 6, 2:04 PM MDT	Areal Flood Advisory	TFX	Fergus	24 hr
Jun 6, 2:13 PM MDT	Special Weather Statement	TFX	Blaine	47 min
Jun 6, 2:16 PM MDT	Special Weather Statement	TFX	Gallatin	44 min
Jun 6, 2:27 PM MDT	Flash Flood Warning	TFX	Gallatin	3 hr
Jun 6, 2:59 PM MDT	Special Weather Statement	TFX		46 min
Jun 6, 4:35 PM MDT	Areal Flood Advisory	TFX	Gallatin, Madison	3 hr
Jun 6, 5:26 PM MDT	Special Weather Statement	TFX	Beaverhead	34 min

Nearby

Severe Thunderstorm Warnings in Montana, 2023 Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.