Alert archive / North Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 298, NWS Grand Forks, ND

August 24, 2020Ransom County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 24, 2020, 3:39 AM CDT for Ransom County, North Dakota. It was in force for 36 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: Aug 24, 2020, 3:39 AM CDT (08:39 UTC)
Expired: Aug 24, 2020, 4:15 AM CDT
In force: 36 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Ransom County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 122 km from the middle of the area, began a volume at 08:40 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

Aberdeen, SD (KABR), launched 00:00Z, 8.7 hours before the alert went out and 182 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2348 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1993 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

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 Aug 24, 2:36 AM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Aug 24, 2:36 AM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, Aug 23, 8:26 PM CDT, 7 hours 13 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
826 PM CDT Sun Aug 23 2020

MNZ002-003-022>024-027>032-040-NDZ024-028>030-038-039-049-052-053-
250130-
Norman-Clay-Mahnomen-South Clearwater-Hubbard-West Becker-
East Becker-Wilkin-West Otter Tail-East Otter Tail-Wadena-Grant-
Eddy-Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland-
826 PM CDT Sun Aug 23 2020

This hazardous weather outlook is for portions of eastern North
Dakota, west central and northwest Minnesota.

.DAY ONE...Tonight

Isolated severe thunderstorms are possible tonight, with the
highest chances along the Interstate 94 corridor in eastern North
Dakota and west central Minnesota. Large hail is the main threat,
but there is also a potential for localized heavy rainfall.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Scattered thunderstorms are possible late Tuesday with a risk of
an isolated severe storm.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

MNZ001-004>009-013>017-NDZ006>008-014>016-026-027-054-250130-
West Polk-Kittson-Roseau-Lake Of The Woods-West Marshall-
East Marshall-North Beltrami-Pennington-Red Lake-East Polk-
North Clearwater-South Beltrami-Towner-Cavalier-Pembina-Benson-
Ramsey-Eastern Walsh-Nelson-Grand Forks-Western Walsh-
826 PM CDT Sun Aug 23 2020

This hazardous weather outlook is for portions of eastern North
Dakota and northwest Minnesota.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Scattered thunderstorms are possible late Tuesday with a risk of
an isolated severe storm.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, Aug 24, 12:30 AM CDT, 3 hours 9 minutes before

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Special weather statement, Aug 24, 1:05 AM CDT, 2 hours 34 minutes before

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Special weather statement, Aug 24, 1:48 AM CDT, 1 hour 51 minutes before

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Special weather statement, Aug 24, 2:34 AM CDT, 1 hour 5 minutes before

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Special weather statement, Aug 24, 3:04 AM CDT, 35 minutes before

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Special weather statement, Aug 24, 3:31 AM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 7:49 PM CDT	Severe Thunderstorm Warning	FGF	Wilkin	27 min
Aug 24, 1:48 AM CDT	Special Weather Statement	FGF	Grant	42 min
Aug 23, 7:23 PM CDT	Special Weather Statement	FGF	Richland	37 min
Aug 23, 8:37 PM CDT	Special Weather Statement	FGF	Barnes	53 min
Aug 23, 8:52 PM CDT	Special Weather Statement	FGF	Barnes	38 min
Aug 23, 9:24 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	36 min
Aug 23, 10:41 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	23 min
Aug 23, 11:28 PM CDT	Special Weather Statement	FGF	Sargent	47 min
Aug 24, 12:02 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	58 min
Aug 24, 12:21 AM CDT	Severe Thunderstorm Warning	FGF	Sargent	24 min
Aug 24, 12:30 AM CDT	Special Weather Statement	FGF	Richland	30 min
Aug 24, 1:05 AM CDT	Special Weather Statement	FGF	Richland	25 min
Aug 24, 2:34 AM CDT	Special Weather Statement	FGF	Barnes	26 min
Aug 24, 3:04 AM CDT	Special Weather Statement	FGF	Ransom	26 min
Aug 24, 3:31 AM CDT	Special Weather Statement	FGF	Ransom, Richland	44 min
Aug 24, 4:07 AM CDT	Special Weather Statement	FGF	Ransom	53 min
Aug 24, 4:14 AM CDT	Special Weather Statement	FGF	Richland	31 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2020 Every 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.