Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 212, NWS Grand Forks, ND

July 26, 2020Norman County, Polk County, Minnesota; Traill County, North Dakota

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.

Skew-T log-pSkew-T log-p diagram, International Fa, MN at 00:00Z on 2020-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 758 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 2020-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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
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Special weather statement, Jul 25, 10:50 PM CDT, 1 hour 18 minutes before
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Special weather statement, Jul 25, 11:23 PM CDT, 45 minutes before
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Special weather statement, Jul 25, 11:48 PM CDT, 20 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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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

Knutsvig
Special 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

Knutsvig

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 11:23 PM CDTSpecial Weather StatementFGFMarshall37 min
Jul 25, 11:57 PM CDTSpecial Weather StatementFGFPennington48 min
Jul 26, 12:34 AM CDTSpecial Weather StatementFGFLake of the Woods, Roseau56 min
Jul 26, 12:58 AM CDTSpecial Weather StatementFGFClearwater, Polk62 min
Jul 26, 1:15 AM CDTAreal Flood AdvisoryFGFPolk3 hr
Jul 26, 1:31 AM CDTSevere Thunderstorm WarningFGFGrant, Wilkin59 min
Jul 26, 1:38 AM CDTSpecial Weather StatementFGFLake of the Woods22 min
Jul 26, 2:29 AM CDTSevere Thunderstorm WarningFGFGrant15 min
Jul 25, 8:48 PM CDTSpecial Weather StatementFGFRamsey42 min
Jul 25, 9:13 PM CDTSevere Thunderstorm WarningFGFRamsey, Walsh47 min
Jul 25, 9:16 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Nelson, Walsh44 min
Jul 25, 9:23 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Griggs, Nelson37 min
Jul 25, 9:55 PM CDTSpecial Weather StatementFGFBarnes50 min
Jul 25, 10:02 PM CDTSpecial Weather StatementFGFWalsh43 min
Jul 25, 10:20 PM CDTSpecial Weather StatementFGFGrand Forks55 min
Jul 25, 10:50 PM CDTSpecial Weather StatementFGFBarnes55 min
Jul 25, 11:48 PM CDTSpecial Weather StatementFGFTraill42 min
Jul 25, 11:51 PM CDTSpecial Weather StatementFGFSargent24 min
Jul 26, 12:43 AM CDTSpecial Weather StatementFGFRichland32 min
Jul 26, 1:04 AM CDTAreal Flood AdvisoryFGFSargent9 hr
Jul 26, 1:16 AM CDTSpecial Weather StatementFGFRichland29 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.