Alert archive / North Dakota / Special Weather Statements in 2017

Special Weather Statement, NWS Bismarck, ND

July 20, 2017Pierce County, North Dakota

NWS Bismarck, ND issued this special weather statement at Jul 20, 2017, 4:59 AM CDT for Pierce County, North Dakota. It was in force for 31 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: Jul 20, 2017, 4:59 AM CDT (09:59 UTC)
Expired: Jul 20, 2017, 5:30 AM CDT
In force: 31 min
Issued by: NWS Bismarck, ND

County Pierce County, ND

The radar

The Minot AFB radar (KMBX), 53 km from the middle of the area, began a volume at 09:59 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, 10.0 hours before the alert went out and 180 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: 172 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1988 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: -23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Bismarck, ND wrote its last area forecast discussion before this special weather statement went out at Jul 20, 3:47 AM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jul 20, 3:47 AM CDT, 1 hour 12 minutes before

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Hazardous weather outlook, Jul 20, 4:01 AM CDT, 58 minutes before

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In the hours before

Special weather statement, Jul 20, 4:59 AM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:36 AM CDT	Special Weather Statement	BIS	Pierce	24 min
Jul 20, 1:47 PM CDT	Special Weather Statement	BIS	Williams	43 min
Jul 20, 2:31 PM CDT	Special Weather Statement	BIS	Mountrail	44 min
Jul 20, 3:15 PM CDT	Severe Thunderstorm Warning	BIS	McKenzie	60 min
Jul 20, 3:49 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie	56 min
Jul 20, 4:19 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McKenzie, McLean, Mountrail	56 min
Jul 20, 4:27 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope, Stark	63 min
Jul 20, 4:56 PM CDT	Special Weather Statement	BIS	Pierce	49 min
Jul 20, 5:05 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Dunn, Stark	55 min
Jul 20, 5:17 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McLean, Mercer	58 min
Jul 20, 5:33 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger, Slope	57 min
Jul 20, 6:01 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton, Stark	59 min
Jul 20, 6:13 PM CDT	Severe Thunderstorm Warning	BIS	McLean, Mercer, Morton, Oliver, Stark	33 min
Jul 20, 6:29 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Grant, Hettinger, Slope, Stark	61 min

Nearby

Special Weather Statements in North Dakota, 2017 Every special weather statement in 2017

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.