Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Great Falls, MT
NWS Great Falls, MT issued this special weather statement at Aug 8, 2021, 1:26 PM MDT for 6 counties in Montana. It was in force for 79 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
- Aug 8, 2021, 1:26 PM MDT (19:26 UTC)
- Expired
- Aug 8, 2021, 2:45 PM MDT
- In force
- 79 min
- Issued by
- NWS Great Falls, MT
- Hail
- 0.00 in
- Wind
- 55
Counties Beaverhead County, MT, Broadwater County, MT, Gallatin County, MT, Jefferson County, MT, Madison County, MT, Meagher County, MT
The radar
The Great Falls radar (KTFX), 187 km from the middle of the area, began a volume at 19:26 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
Great_falls, MT (KTFX), launched 12:00Z, 7.4 hours before the alert went out and 213 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.
- Mixed-layer CAPE
- 16 J/kg
- Mixed-layer CIN
- -213 J/kg
- Mixed-layer LCL
- 2411 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Aug 8, 11:50 AM MDT, 1 hour 36 minutes earlier.
Area forecast discussion, Aug 8, 11:50 AM MDT, 1 hour 36 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>In the hours before
Local storm report, Aug 8, 10:13 AM MDT, 3 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1013 AM MDT SUN AUG 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0945 AM HEAVY RAIN 22 WNW BABB 48.96N 113.89W
08/08/2021 M1.28 INCH GLACIER MT MESONET
MESONET STATION GTOM8 19.7 NW LOGAN PASS.
0921 AM HEAVY RAIN 8 SE EAST GLACIER PARK 48.36N 113.11W
08/08/2021 M0.72 INCH GLACIER MT MESONET
MESONET STATION DCRM8 DEEP CREEK RAWS.
0911 AM HEAVY RAIN SAINT MARY 48.74N 113.43W
08/08/2021 M0.70 INCH GLACIER MT MESONET
MESONET STATION SRYM8 SAINT MARY RAWS.
0930 AM HEAVY RAIN 11 SW EAST GLACIER PARK 48.32N 113.35W
08/08/2021 M0.66 INCH GLACIER MT MESONET
MESONET STATION SUMM8 5.2 NE BLACKTAIL -
RAILROAD ID.
0900 AM HEAVY RAIN 4 NNW AUGUSTA 47.55N 112.43W
08/08/2021 M0.61 INCH LEWIS AND CLARK MT MESONET
MESONET STATION WLLM8 4.1 NW AUGUSTA.
0900 AM HEAVY RAIN 5 SE BROWNING 48.51N 112.93W
08/08/2021 M0.51 INCH GLACIER MT MESONET
MESONET STATION SHBM8 5.2 SE BROWNING.
&&Special weather statement, Aug 8, 1:26 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
126 PM MDT Sun Aug 8 2021
MTZ008-014-015-052>055-082045-
Broadwater MT-Madison MT-Beaverhead MT-Jefferson MT-Gallatin MT-
Central and Southern Lewis and Clark MT-Meagher MT-
126 PM MDT Sun Aug 8 2021
...Strong gusty wind threat will increase through the afternoon
across portions of Lewis and Clark, Broadwater, Meagher, Madison,
Beaverhead, Jefferson, and Gallatin Counties...
At 122 PM MDT, Doppler radar was tracking thunderstorms developing
across the area and generally moving east. Wind gusts of around 40
mph will be common with these storms. Isolated to scattered wind
gusts of 50 to 55 mph may also occur.
HAZARD...Wind gusts of 50 to 55 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Bozeman, Helena, Dillon, Townsend, West Yellowstone, Boulder, White
Sulphur Springs, Sheridan, Virginia City, Henrys Lake, Lincoln,
Belgrade, East Helena, Three Forks, Manhattan, Whitehall, Ennis, Twin
Bridges, Lima and Pony.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near area lakes, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.
&&
LAT...LON 4436 11285 4569 11394 4594 11351 4576 11339
4563 11270 4575 11219 4623 11260 4662 11230
4684 11280 4712 11279 4713 11183 4691 11179
4705 11111 4670 11027 4619 11028 4619 11078
4449 11110 4475 11139 4454 11148 4457 11229
TIME...MOT...LOC 1922Z 294DEG 42KT 4675 11242 4515 11354
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH
HARTThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 2:37 PM MDT | Special Weather Statement | TFX | Beaverhead, Broadwater, Gallatin, Jefferson, Madison | 83 min |
| Aug 8, 2:46 PM MDT | Special Weather Statement | TFX | Cascade, Judith Basin, Meagher | 59 min |
| Aug 8, 3:09 PM MDT | Areal Flood Advisory | TFX | Cascade | 51 min |
| Aug 8, 3:31 PM MDT | Special Weather Statement | TFX | Fergus, Judith Basin, Meagher | 59 min |
| Aug 8, 4:03 PM MDT | Special Weather Statement | TFX | Beaverhead, Gallatin, Madison, Meagher | 57 min |
| Aug 8, 4:29 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead, Gallatin, Madison | 61 min |
Nearby
Special Weather Statements in Montana, 2021Every special weather statement 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.