Alert archive / Montana / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 52, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jul 7, 2020, 7:04 PM MDT for Daniels County, Roosevelt County, Sheridan County, Montana. It was in force for 56 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 7, 2020, 7:04 PM MDT (01:04 UTC)
- Expired
- Jul 7, 2020, 8:00 PM MDT
- In force
- 56 min
- Issued by
- NWS Glasgow, MT
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Daniels County, MT, Roosevelt County, MT, Sheridan County, MT
The radar
The Glasgow radar (KGGW), 126 km from the middle of the area, began a volume at 01:04 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 7, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 1.1 hours before the alert went out and 382 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
- 972 J/kg
- Mixed-layer CIN
- -223 J/kg
- Mixed-layer LCL
- 1688 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 7, 1:15 PM MDT, 5 hours 49 minutes earlier.
Area forecast discussion, Jul 7, 1:15 PM MDT, 5 hours 49 minutes before
Area Forecast Discussion National Weather Service Glasgow MT 115 PM MDT Tue Jul 7 2020 .DISCUSSION... A widespread severe weather event is on track for all of Northeast Montana from late afternoon through the evening hours. Storms are forming across the higher terrain in central and southwest Montana and will progress eastward into Northeast Montana. Storms may be semi-discrete initially as they enter Phillips and Petroleum Counties. If they are able to remain discrete then very large hail to the size of baseballs, damaging winds in excess of 70 mph, and an isolated tornado will be possible. Once the storms merge into one or more line segments destructive wind gusts in excess of 70 to 80 mph will become the primary threat. Look for this main line of storms to arrive in Phillips and Petroleum Counties around 4 or 5 PM, Opheim to Glasgow to Jordan around 6 to 7 PM, and the ND border by 9 to 10 PM or so. It is possible a few isolated storms could enter the Yellowstone River Valley ahead of this primary line of storms during the early evening hours. If this were to happen, all severe modes would be possible. An upper trough moves across the state on Wednesday with slightly cooler and generally drier weather. A few storms are possible near the Canadian border with the proximity of a stacked low pressure system moving from Saskatchewan into Manitoba. Ridge then builds north from the Desert Southwest for hot and dry weather for the remainder of the week. Could see a few thunderstorms on Friday as a shortwave pushes through the top of the ridge. -Mottice/RAE && .AVIATION... A line of severe storms should reach KGGW around 00-01Z, KOLF 01-02z, and KGDV and KSDY between 02 and 03z this evening. This line of storms will bring intense and erratic winds as well as hail, heavy rain, and brief IFR conditions. Skies should be clearing out by 06z for much of the region. && .GLASGOW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory until 10 PM MDT this evening For Fort Peck Lake for Central and Southeast Phillips...Central and Southern Valley...Garfield...McCone...Petroleum. && weather.gov/glasgow
In the hours before
Local storm report, Jul 7, 5:41 PM MDT, 1 hour 23 minutes before
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</html>Local storm report, Jul 7, 5:44 PM MDT, 1 hour 20 minutes before
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</html>Local storm report, Jul 7, 5:49 PM MDT, 1 hour 15 minutes before
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</html>Local storm report, Jul 7, 5:51 PM MDT, 1 hour 13 minutes before
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</html>Local storm report, Jul 7, 5:54 PM MDT, 1 hour 10 minutes before
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</html>Local storm report, Jul 7, 5:55 PM MDT, 1 hour 9 minutes before
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</html>The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:13 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt, Sheridan, Valley | 62 min |
| Jul 7, 6:27 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, McCone, Prairie, Richland, Roosevelt and 2 more | 63 min |
| Jul 7, 6:40 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Garfield, Prairie, Wibaux | 65 min |
| Jul 7, 7:24 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, McCone, Prairie, Richland, Roosevelt, Sheridan and 1 more | 66 min |
| Jul 7, 7:58 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 32 min |
| Jul 7, 8:24 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Richland, Wibaux | 25 min |
| Jul 8, 2:21 AM MDT | Lake Wind Advisory | GGW | Garfield, McCone, Petroleum, Phillips, Valley | 22 hr |
Nearby
Severe Thunderstorm Warnings in Montana, 2020Every severe thunderstorm warning in 2020
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.