Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Glasgow, MT
NWS Glasgow, MT issued this special weather statement at Aug 4, 2021, 10:48 PM MDT for Petroleum County, Montana. It was in force for 57 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 4, 2021, 10:48 PM MDT (04:48 UTC)
- Expired
- Aug 4, 2021, 11:45 PM MDT
- In force
- 57 min
- Issued by
- NWS Glasgow, MT
- Hail
- 0.88 in
- Wind
- 30
County Petroleum County, MT
The radar
The Glasgow radar (KGGW), 147 km from the middle of the area, began a volume at 04:52 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
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.8 hours before the alert went out and 149 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
- 133 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 2787 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</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 Glasgow, MT wrote its last area forecast discussion before this special weather statement went out at Aug 4, 2:57 PM MDT, 7 hours 51 minutes earlier.
Area forecast discussion, Aug 4, 2:57 PM MDT, 7 hours 51 minutes before
Area Forecast Discussion National Weather Service Glasgow MT 257 PM MDT Wed Aug 4 2021 .DISCUSSION... An embedded short-wave disturbance riding around the top of the larger-scale high pressure ridge to our west is setting of some small isolated thunderstorms across eastern Montana. Most of the them are pulsing up, then diminishing 10 minutes later, but a few others are maintaining their strength. Again, their spatial coverage is so small, that some locations will get no precipitation at all while small tracts of land here and their will get a brief beneficial downpour. A few of the stronger cells may include small hail this afternoon. Tonight, a few of the models are hinting at enough leftover energy to allow for a few nocturnal thunderstorms across our central and northern zones. Otherwise, Thursday will shape up to generally be a dry and hot day with less chances for precipitation as this ridge of high pressure briefly rebounds. Friday seems to be the beginning of a change in the weather pattern. A stronger, more pronounced low pressure disturbance digs into the Snake River Valley and Yellowstone National Park by Friday mid day. During the afternoon and evening hours, when this storm system lifts northeastward through eastern Montana, models are showing better chances for accumulating rainfall through Saturday morning. I tried to increase PoPs accordingly to account for this recent increase in forecast confidence. By Sunday night, another stronger storm system from British Columbia looks to cut temperatures back to near or below normal for the first time in many weeks and more chances for accumulating rainfall. && .AVIATION... PATTERN: The otherwise benign NW flow aloft hides a small-scale embedded disturbance with many models showing some scattered precipitation today. Radar reflectivity confirms this with multiple isolated thunderstorm across the area. This activity should continue into this evening. FLIGHT CONDITIONS: Mainly VFR, but borderline IFR if an afternoon thunderstorm happens to pass directly over a TAF site. VFR conditions are expected to return after the storms clear the area later tonight. WINDS: From the NW at 10 to 15 kts, with thunderstorm wind gusts up to 30 kts from 21Z to 02Z. After 03Z tonight, expect light and variable winds, if not calm. && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && weather.gov/glasgow
In the hours before
Special weather statement, Aug 4, 5:15 PM MDT, 5 hours 33 minutes before
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</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.
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Please try again in a few minutes.
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</html>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.