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 Jun 9, 2021, 5:47 PM MDT. It was in force for 28 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
- Jun 9, 2021, 5:47 PM MDT (23:47 UTC)
- Expired
- Jun 9, 2021, 6:15 PM MDT
- In force
- 28 min
- Issued by
- NWS Great Falls, MT
The radar
The Great Falls radar (KTFX), 159 km from the middle of the area, began a volume at 23:49 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, 11.8 hours before the alert went out and 103 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 910 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 147 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 Jun 9, 5:45 PM MDT, 2 minutes earlier.
Area forecast discussion, Jun 9, 5:45 PM MDT, 2 minutes before
Area Forecast Discussion National Weather Service Great Falls MT 545 PM MDT Wed Jun 9 2021 ...Update to Aviation... .SYNOPSIS... Showers and thunderstorms will become widespread across north central and southwest Montana this afternoon through late evening Some storms could become severe across north central Montana, producing strong and gusty outflow winds, large hail. On Thursday, a Pacific cool front moves through the region, producing another round of scattered showers and thunderstorms. It turns drier and warmer over the weekend, with near record high temperatures possible early next week. && .DISCUSSION... Tonight through Friday...Once again, an unsettled southwesterly flow aloft with an embedded disturbance will prevail across western and central Montana late this afternoon through this evening. Widespread showers and thunderstorms will develop between 4 PM and 6 PM MDT and some storms are expected to become severe with strong outflow winds, large hail, and a small risk for an isolated tornado. Strong to severe storms are expected to diminish by late evening, but showers and a few thunderstorms cold continue overnight and into Thursday morning. On Thursday, a Pacific cool front will move through the region by afternoon. Expect gusty west winds to develop behind the front. There will continue to be a chance for thunderstorms along the front as well, with a marginal risk of severe storms over the eastern portions of the region during the late afternoon and evening. Afternoon temperatures on Thursday will be well below normal over the western portions of the area, and near normal elsewhere. Friday morning low temperatures will be near freezing in some locations, especially across southwestern Montana. Mostly dry conditions and seasonable temperatures are expected on Friday. Saturday through Wednesday...Expect mostly dry conditions, along with a significant warming trend from Saturday through Tuesday. The peak of the next heat wave looks to occur on Tuesday, with afternoon temperatures in the mid to upper 90s in many areas. At this time, probability information indicates most areas should remain below 100 degrees. On Wednesday, a Pacific cool front will move through the region, resulting in windy conditions developing. Fire concerns could start to increase by this time next week. Brusda && .AVIATION... 545 PM MDT Wed Jun 9 2021 (10/00Z TAF period) Showers and thunderstorms have been a bit slow to get going this afternoon, but activity is expected to develop during the early evening hours. Best likelihood for storms will be east of a line from Great Falls to Havre. Some storms could become severe with the potential for strong winds, moderate to large hail, and a slight risk for a tornado. Scattered showers and perhaps an isolated thunderstorm will persist overnight into Thursday morning. Another round of stronger storms is expected to develop after 18Z Thursday. VFR conditions will prevail through the forecast period, but IFR/MVFR conditions should be expected in precipitation. mpj Refer to weather.gov/zlc for more detailed regional aviation weather and hazard information. && .PRELIMINARY POINT TEMPS/POPS... GTF 50 66 41 71 / 50 70 30 0 CTB 45 58 40 66 / 80 80 10 0 HLN 52 71 40 74 / 30 90 20 0 BZN 49 75 35 71 / 10 70 40 0 WYS 43 60 27 61 / 10 60 40 0 DLN 49 65 32 67 / 10 100 30 0 HVR 54 74 46 72 / 60 50 40 0 LWT 50 77 40 69 / 30 60 70 0 && .TFX WATCHES/WARNINGS/ADVISORIES... None. && http://www.weather.gov/greatfalls
In the hours before
Special weather statement, Jun 9, 5:47 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
547 PM MDT Wed Jun 9 2021
MTZ047-100015-
Blaine MT-
547 PM MDT Wed Jun 9 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN FERGUS...SOUTHWESTERN
BLAINE AND EASTERN CHOUTEAU COUNTIES UNTIL 615 PM MDT...
At 545 PM MDT, Doppler radar was tracking a strong thunderstorm 18
miles north of Winifred, or 40 miles southeast of Big Sandy, moving
northeast at 15 mph.
Pea size hail, heavy rain, and wind gusts up to 50 mph will be
possible with this storm.
This storm will remain over mainly rural areas of northern Fergus,
southwestern Blaine and eastern Chouteau Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify.
&&
LAT...LON 4779 10922 4780 10927 4777 10928 4773 10940
4772 10946 4775 10953 4786 10954 4807 10943
4795 10895
TIME...MOT...LOC 2345Z 208DEG 13KT 4783 10941
PNNearby
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.