Alert archive / North Dakota / Special Weather Statements in 2020

Special Weather Statement, NWS Grand Forks, ND

August 20, 2020Towner County, North Dakota

NWS Grand Forks, ND issued this special weather statement at Aug 20, 2020, 6:19 AM CDT for Towner County, North Dakota. 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 outline as issued.

The facts

Issued: Aug 20, 2020, 6:19 AM CDT (11:19 UTC)
Expired: Aug 20, 2020, 7:15 AM CDT
In force: 56 min
Issued by: NWS Grand Forks, ND

County Towner County, ND

The radar

The Minot AFB radar (KMBX), 135 km from the middle of the area, began a volume at 11:20 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, 11.3 hours before the alert went out and 430 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: 2129 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1493 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 20, 4:03 AM CDT, 2 hours 16 minutes earlier.

Area forecast discussion, Aug 20, 4:03 AM CDT, 2 hours 16 minutes before

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Hazardous weather outlook, Aug 20, 6:15 AM CDT, 4 minutes before

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In the hours before

Local storm report, Aug 20, 2:23 AM CDT, 3 hours 56 minutes before

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Special weather statement, Aug 20, 2:23 AM CDT, 3 hours 56 minutes before

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Local storm report, Aug 20, 2:30 AM CDT, 3 hours 49 minutes before

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Local storm report, Aug 20, 2:33 AM CDT, 3 hours 46 minutes before

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Special weather statement, Aug 20, 5:20 AM CDT, 59 minutes before

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Special weather statement, Aug 20, 6:19 AM CDT, 0 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 20, 12:20 AM CDT	Severe Thunderstorm Warning	FGF	Kittson	55 min
Aug 20, 12:57 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Roseau	63 min
Aug 20, 1:27 AM CDT	Special Weather Statement	FGF	Marshall	33 min
Aug 20, 1:43 AM CDT	Special Weather Statement	FGF	Marshall	32 min
Aug 20, 2:23 AM CDT	Special Weather Statement	FGF	Marshall, Pennington, Red Lake	37 min
Aug 20, 5:20 AM CDT	Special Weather Statement	FGF	Towner	55 min
Aug 20, 7:17 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Ramsey, Towner	30 min
Aug 20, 7:47 AM CDT	Special Weather Statement	FGF	Ramsey, Walsh	28 min
Aug 20, 9:11 AM CDT	Special Weather Statement	FGF	Eddy	34 min

Nearby

Special Weather Statements in North Dakota, 2020 Every special weather statement 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.