Alert archive / North Dakota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 165, NWS Grand Forks, ND

August 20, 2019Benson County, Nelson County, Ramsey County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 20, 2019, 12:44 AM CDT for Benson County, Nelson County, Ramsey County, North Dakota. It was in force for 61 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 20, 2019, 12:44 AM CDT (05:44 UTC)
Expired: Aug 20, 2019, 1:45 AM CDT
In force: 61 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Benson County, ND, Nelson County, ND, Ramsey County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 124 km from the middle of the area, began a volume at 05:46 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.7 hours before the alert went out and 207 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: 490 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 2105 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 19, 11:48 PM CDT, 56 minutes earlier.

Area forecast discussion, Aug 19, 11:48 PM CDT, 56 minutes before

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Hazardous weather outlook, Aug 20, 12:36 AM CDT, 8 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
1236 AM CDT Tue Aug 20 2019

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-210545-
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 County-Eddy-Nelson-
Grand Forks-Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-
Richland-Western Walsh County-
1236 AM CDT Tue Aug 20 2019

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

.DAY ONE...Tonight

Isolated severe thunderstorms are possible along a frontal
boundary. The main hazards will be large hail up to quarter size
and damaging wind gusts up to 60 mph.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Some thunderstorms may be ongoing in northwestern Minnesota
Tuesday morning.

Thunderstorms are again possible periodically from Thursday night
through Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

In the hours before

Local storm report, Aug 19, 11:37 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS ND
1137 PM CDT MON AUG 19 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1115 PM     HAIL             4 ENE LEEDS             48.31N 99.36W
08/19/2019  E1.00 INCH       Benson             ND   BROADCAST MEDIA

            MEDIA RECEIVED PHOTO OF QUARTER SIZED DIAMETER HAIL

&&

BP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 3:10 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	53 min
Aug 20, 3:43 AM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk	18 min
Aug 20, 4:07 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	23 min
Aug 20, 4:25 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Clearwater, Mahnomen, Norman	65 min
Aug 20, 4:30 AM CDT	Special Weather Statement	FGF	Lake of the Woods	30 min
Aug 20, 5:01 AM CDT	Special Weather Statement	FGF	Becker	14 min
Aug 20, 5:13 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Hubbard, Mahnomen, Otter Tail, Wadena	62 min
Aug 20, 5:28 AM CDT	Special Weather Statement	FGF	Beltrami, Clearwater	47 min
Aug 20, 6:09 AM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	36 min
Aug 19, 11:04 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	56 min
Aug 20, 12:00 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	45 min
Aug 20, 2:17 AM CDT	Special Weather Statement	FGF	Grand Forks	58 min
Aug 20, 2:24 AM CDT	Special Weather Statement	FGF	Nelson	51 min
Aug 20, 2:39 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele, Traill	66 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2019 Every severe thunderstorm warning in 2019

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.