Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 212, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 26, 2020, 12:08 AM CDT for Norman County, Polk County, Minnesota; Traill County, North Dakota. It was in force for 52 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 26, 2020, 12:08 AM CDT (05:08 UTC)
- Expired
- Jul 26, 2020, 1:00 AM CDT
- In force
- 52 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Norman County, MN, Polk County, MN, Traill County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 49 km from the middle of the area, began a volume at 05:09 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
International Fa, MN (KINL), launched 00:00Z, 5.1 hours before the alert went out and 277 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
- 758 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1249 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 11:58 PM CDT, 10 minutes earlier.
Area forecast discussion, Jul 25, 11:58 PM CDT, 10 minutes before
Area Forecast Discussion National Weather Service Grand Forks ND 1158 PM CDT Sat Jul 25 2020 .UPDATE... Issued at 1158 PM CDT Sat Jul 25 2020 The frontal boundary continues to push across the area, with showers and thunderstorms behind it. Most of the precip is with the mid level frontogensis so storms are not surface based. Other than a cell near the SD border most are not near severe. Precip will continue to push eastward through the next few hours as the front moves through. UPDATE Issued at 944 PM CDT Sat Jul 25 2020 More storms are starting to expand into the Devils Lake Basin just behind the surface front, and the cores are rising upwards as they move into more unstable air. Disorganized and pulsy at this point, but will have to monitor closely for the next few hours as the front continues to push into the RRV where instability is still extremely high. UPDATE Issued at 656 PM CDT Sat Jul 25 2020 Adjusted POPs a bit for showers and thunderstorms that have been sparse to develop along the front across the Devils Lake Basin. There continues to be some towers trying to go up along the boundary and some post frontal showers and storms further west, so continued to keep POPs fairly high for now. Will continue to monitor as the front pushes southeast. && .SHORT TERM...(This evening through Sunday night) Issued at 303 PM CDT Sat Jul 25 2020 The main impact for the short term will be the cold frontal passage tonight, and any associated severe storms with it. Low clouds are finally scouring out of the southern Red River Valley, yet some still remain over west central Minnesota. Other areas have cleared, allowing good heating, with plenty of moisture. SPC meso page shows plenty of surface based CAPE along and west of the Valley, with good 0-6km effective shear. Surface cold front appears to be inching into the Devils Lake region and central North Dakota, which will be the focus for late afternoon and evening showers and storms. High resolution guidance shows activity breaking out over central North Dakota between 5 and 7 pm, with potential strong to severe storms then. Think most of the strong to severe activity will last through sundown, then think it will trend downward again. Not much of a low level jet tonight to keep things going beyond then, but will be monitoring those trends this evening. Even though storms may not be severe by late evening and overnight, they should hold together and bring some rain to many areas. All this activity should move out of the FA by late Sunday morning, with the rest of the period looking more normal temperature-wise, and quieter. .LONG TERM...(Monday through Saturday) Issued at 303 PM CDT Sat Jul 25 2020 July has been an active month so far, but it looks like we will be getting a break near the end of the month. High pressure is present at the surface throughout much of the next week. This quieter high pressure pattern starts to break down later in the week with some chances for showers or thunderstorms returning Friday into the weekend. For this potentially more active period there is good agreement on a change in pattern around this time, but specifics are uncertain with the spread in deterministic and ensemble guidance. Temperatures in this period will be relatively stable with a slight warming trend going from near normal on Monday to warmer than normal later in the week. && .AVIATION...(For the 06Z TAFS through 06Z Sunday night) Issued at 1158 PM CDT Sat Jul 25 2020 Showers and thunderstorms moving along a cold front will push across the ND Red River airports and towards KTVF. Do not think it will hold together to get to KBJI but will continue to monitor. VFR conditions behind the storms and for the rest of the period. Winds will pick up from the northwest with some gusts above 20 kts possible tomorrow afternoon, then drop again in the evening. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None. UPDATE...JR SHORT TERM...Godon LONG TERM...NC AVIATION...JR
Hazardous weather outlook, Jul 25, 4:11 AM CDT, 19 hours 57 minutes before
Hazardous Weather Outlook National Weather Service Grand Forks ND 411 AM CDT Sat Jul 25 2020 MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-261300- West Polk-Norman-Clay-Kittson-Roseau-Lake Of The Woods- West Marshall-East Marshall-North Beltrami-Pennington-Red Lake- East Polk-North Clearwater-South Beltrami-Mahnomen- South Clearwater-Hubbard-West Becker-East Becker-Wilkin- West Otter Tail-East Otter Tail-Wadena-Grant-Towner-Cavalier- Pembina-Benson-Ramsey-Eastern Walsh-Eddy-Nelson-Grand Forks- Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland- Western Walsh- 411 AM CDT Sat Jul 25 2020 This hazardous weather outlook is for portions of eastern North Dakota, west central and northwest Minnesota. .DAY ONE...Today and Tonight Isolated severe thunderstorms are possible this afternoon and evening. Storms are expected to affect the Devils Lake basin after 4pm, and the remainder of eastern North Dakota into the Red River Valley after 6pm. Severe storm potential will diminish after sunset. Main threats include hail up to 1.5 inches and wind gusts up to 60 mph. .DAYS TWO THROUGH SEVEN...Sunday through Friday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required this afternoon.
In the hours before
Special weather statement, Jul 25, 10:20 PM CDT, 1 hour 48 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>Special weather statement, Jul 25, 10:50 PM CDT, 1 hour 18 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>Special weather statement, Jul 25, 11:23 PM CDT, 45 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>Special weather statement, Jul 25, 11:48 PM CDT, 20 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>Special weather statement, Jul 25, 11:51 PM CDT, 17 minutes before
Special Weather Statement
National Weather Service Grand Forks ND
1151 PM CDT Sat Jul 25 2020
NDZ052-260515-
Sargent ND-
1151 PM CDT Sat Jul 25 2020
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SARGENT COUNTY UNTIL
1215 AM CDT...
At 1151 PM CDT, Doppler radar was tracking a strong thunderstorm near
Brampton, or 62 miles west of Wahpeton, moving east at 40 mph.
Penny size hail and wind gusts up to 50 mph will be possible with
this storm.
This strong thunderstorm will be near...
Brampton around 1155 PM CDT.
Havana around 1205 AM CDT.
Rutland around 1215 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.
&&
LAT...LON 4594 9801 4608 9801 4608 9726 4600 9726
4599 9725 4593 9724
TIME...MOT...LOC 0451Z 265DEG 36KT 4597 9783
KnutsvigSpecial weather statement, Jul 25, 11:57 PM CDT, 11 minutes before
Special Weather Statement
National Weather Service Grand Forks ND
1157 PM CDT Sat Jul 25 2020
MNZ007-008-013-260545-
East Marshall MN-Pennington MN-West Marshall MN-
1157 PM CDT Sat Jul 25 2020
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MARSHALL AND NORTHERN
PENNINGTON COUNTIES UNTIL 1245 AM CDT...
At 1157 PM CDT, Doppler radar was tracking a strong thunderstorm over
Rosewood, or 8 miles northwest of Thief River Falls, moving east at
35 mph.
Penny size hail and wind gusts up to 50 mph will be possible with
this storm.
This strong thunderstorm will be near...
Dakota Junction and Thief River Falls around 1205 AM CDT.
Holt around 1210 AM CDT.
Gatzke around 1240 AM CDT.
Grygla around 1245 AM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.
&&
LAT...LON 4806 9639 4826 9645 4854 9560 4841 9561
4836 9560 4816 9559
TIME...MOT...LOC 0457Z 250DEG 32KT 4820 9630
KnutsvigThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 11:23 PM CDT | Special Weather Statement | FGF | Marshall | 37 min |
| Jul 25, 11:57 PM CDT | Special Weather Statement | FGF | Pennington | 48 min |
| Jul 26, 12:34 AM CDT | Special Weather Statement | FGF | Lake of the Woods, Roseau | 56 min |
| Jul 26, 12:58 AM CDT | Special Weather Statement | FGF | Clearwater, Polk | 62 min |
| Jul 26, 1:15 AM CDT | Areal Flood Advisory | FGF | Polk | 3 hr |
| Jul 26, 1:31 AM CDT | Severe Thunderstorm Warning | FGF | Grant, Wilkin | 59 min |
| Jul 26, 1:38 AM CDT | Special Weather Statement | FGF | Lake of the Woods | 22 min |
| Jul 26, 2:29 AM CDT | Severe Thunderstorm Warning | FGF | Grant | 15 min |
| Jul 25, 8:48 PM CDT | Special Weather Statement | FGF | Ramsey | 42 min |
| Jul 25, 9:13 PM CDT | Severe Thunderstorm Warning | FGF | Ramsey, Walsh | 47 min |
| Jul 25, 9:16 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Nelson, Walsh | 44 min |
| Jul 25, 9:23 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Griggs, Nelson | 37 min |
| Jul 25, 9:55 PM CDT | Special Weather Statement | FGF | Barnes | 50 min |
| Jul 25, 10:02 PM CDT | Special Weather Statement | FGF | Walsh | 43 min |
| Jul 25, 10:20 PM CDT | Special Weather Statement | FGF | Grand Forks | 55 min |
| Jul 25, 10:50 PM CDT | Special Weather Statement | FGF | Barnes | 55 min |
| Jul 25, 11:48 PM CDT | Special Weather Statement | FGF | Traill | 42 min |
| Jul 25, 11:51 PM CDT | Special Weather Statement | FGF | Sargent | 24 min |
| Jul 26, 12:43 AM CDT | Special Weather Statement | FGF | Richland | 32 min |
| Jul 26, 1:04 AM CDT | Areal Flood Advisory | FGF | Sargent | 9 hr |
| Jul 26, 1:16 AM CDT | Special Weather Statement | FGF | Richland | 29 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2020Severe Thunderstorm Warnings in North Dakota, 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.