Alert archive / Montana / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 124, NWS Great Falls, MT

July 13, 2022Madison County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 13, 2022, 4:12 PM MDT for Madison County, Montana. It was in force for 51 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: Jul 13, 2022, 4:12 PM MDT (22:12 UTC)
Expired: Jul 13, 2022, 5:03 PM MDT
In force: 51 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Madison County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 13, 2:26 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.2 hours before the alert went out and 390 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3969 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

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 Jul 13, 1:57 PM MDT, 2 hours 15 minutes earlier.

Area forecast discussion, Jul 13, 1:57 PM MDT, 2 hours 15 minutes before

Area Forecast Discussion
National Weather Service Great Falls MT
157 PM MDT Wed Jul 13 2022

.SYNOPSIS...

Showers and thunderstorms will move through portions of the area
this afternoon and evening, before moving off to the east
overnight tonight. In the wake of these showers and storms,
temperatures tomorrow will be a few degrees cooler than what is
seen today.

&&

.DISCUSSION...

Thursday... Showers and thunderstorms have begun to develop across
Southwestern Montana in a warm unstable air mass. Biggest question
at the moment is how much the late morning/early afternoon cloud
cover will inhibit development over portions of North-Central MT,
particularly around the Great Falls area, but given that
thunderstorms have already begun to develop as of 2 PM MDT,
thunderstorm initiation should not be much of an issue. However,
the cloud cover has inhibited some of the DCAPE (potential for
downdrafts and subsequent outflows), but this DCAPE remains
sufficient for some gusty thunderstorm outflow winds, especially
east of Great Falls. Storms this afternoon will move to the
northeast, and should remain south and east of a line from Great
Falls to Havre once they reach the plains. Ludwig

Friday through Sunday.... For Friday/Saturday, the thunderstorm
development is expected to be isolated. The main threat from any
storms will be gusty winds and lightning. Afternoon temperatures
will continue to average 5 to 10 degrees above normal. By Sunday,
this will be several days with previous afternoon highs of 90
degrees and higher. With some areas approaching high temperatures
above 95 to near 100 degrees on Saturday and Sunday, a Heat Advisory
may be needed for portions of North Central MT for both days with a
higher consideration of an advisory for Sunday.

Monday through Wednesday...A quick moving upper level disturbance
moves eastward across the Hi-line area on Monday, this could result
in a few isolated thunderstorms. Otherwise, an upper level ridge
returns by Tuesday with drier conditions and near normal average
temperatures for Tuesday and Wednesday.

&&

.AVIATION...
1230 AM MDT Wed Jul 13 2022 (13/18Z TAF period)

While VFR conditions should continue through the majority of the
forecast period, gusty showers and thunderstorms are expected to
develop across SW MT this afternoon and move northeastward, and
should primarily remain near and south and east of a Great Falls to
Havre line. Remain alert for strong, gusty outflow winds and strong
downdrafts from any shower or storm today. Ludwig

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

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  57  93  57  94 /  30   0  10  20
CTB  53  87  55  90 /   0   0   0  10
HLN  61  93  61  93 /  30  10  10  30
BZN  55  92  56  91 /  30  30  20  40
WYS  46  84  47  83 /  70  40  20  40
DLN  53  88  54  86 /  20  30  20  30
HVR  62  90  63  96 /  30   0  10  20
LWT  57  88  59  91 /  60  10  20  30

&&

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

http://www.weather.gov/greatfalls

In the hours before

Special weather statement, Jul 13, 2:48 PM MDT, 1 hour 24 minutes before

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Special weather statement, Jul 13, 3:17 PM MDT, 55 minutes before

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Special weather statement, Jul 13, 3:29 PM MDT, 43 minutes before

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Special weather statement, Jul 13, 3:30 PM MDT, 42 minutes before

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Special weather statement, Jul 13, 3:53 PM MDT, 19 minutes before

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Special weather statement, Jul 13, 4:06 PM MDT, 6 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
Jul 13, 12:47 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson	43 min
Jul 13, 12:58 PM MDT	Special Weather Statement	TFX	Gallatin	17 min
Jul 13, 1:30 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson	45 min
Jul 13, 1:42 PM MDT	Special Weather Statement	TFX	Broadwater	48 min
Jul 13, 1:54 PM MDT	Special Weather Statement	TFX	Beaverhead	51 min
Jul 13, 2:03 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	27 min
Jul 13, 2:14 PM MDT	Special Weather Statement	TFX	Meagher	46 min
Jul 13, 2:28 PM MDT	Special Weather Statement	TFX	Madison	17 min
Jul 13, 2:47 PM MDT	Special Weather Statement	TFX	Judith Basin	58 min
Jul 13, 2:48 PM MDT	Special Weather Statement	TFX	Madison	27 min
Jul 13, 3:17 PM MDT	Special Weather Statement	TFX	Gallatin	58 min
Jul 13, 3:21 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Gallatin, Jefferson, Madison	39 min
Jul 13, 3:29 PM MDT	Special Weather Statement	TFX	Beaverhead	46 min
Jul 13, 3:30 PM MDT	Special Weather Statement	TFX		45 min
Jul 13, 3:46 PM MDT	Severe Thunderstorm Warning	TFX	Fergus, Judith Basin	44 min
Jul 13, 3:53 PM MDT	Special Weather Statement	TFX	Gallatin	37 min
Jul 13, 4:06 PM MDT	Special Weather Statement	TFX	Madison	54 min
Jul 13, 4:16 PM MDT	Special Weather Statement	TFX	Ravalli	44 min
Jul 13, 4:27 PM MDT	Special Weather Statement	TFX	Meagher	33 min
Jul 13, 4:30 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	60 min
Jul 13, 4:58 PM MDT	Special Weather Statement	TFX	Meagher	32 min
Jul 13, 5:03 PM MDT	Special Weather Statement	TFX	Gallatin	42 min
Jul 13, 5:33 PM MDT	Special Weather Statement	TFX		42 min
Jul 13, 5:35 PM MDT	Special Weather Statement	TFX	Fergus	40 min
Jul 13, 5:37 PM MDT	Special Weather Statement	TFX	Jefferson	38 min

Nearby

Severe Thunderstorm Warnings in Montana, 2022 Every severe thunderstorm warning in 2022

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.