Alert archive / North Dakota / Winter Storm Watches in 2017

Winter Storm Watch 2, NWS Bismarck, ND

December 18, 201711 counties in North Dakota

NWS Bismarck, ND issued this winter storm watch at Dec 18, 2017, 3:01 PM CST for 11 counties in North Dakota. It took effect at Dec 20, 2017, 12:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 18, 2017, 3:01 PM CST (21:01 UTC)
In effect from: Dec 20, 2017, 12:00 AM CST
Expired: Dec 19, 2017, 2:57 PM CST
In force
Issued by: NWS Bismarck, ND

Counties Bottineau County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, McHenry County, ND, McKenzie County, ND, Mercer County, ND, Mountrail County, ND, Renville County, ND, Sheridan County, ND, Williams County, ND

The radar

The Minot AFB radar (KMBX), 95 km from the middle of the area, began a volume at 21:03 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 9.0 hours before the alert went out and 333 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 85 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm watch 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 winter storm watch went out at Dec 18, 2:58 PM CST, 3 minutes earlier.

Area forecast discussion, Dec 18, 2:58 PM CST, 3 minutes before

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Hazardous weather outlook, Dec 18, 7:03 AM CST, 7 hours 58 minutes before

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In the hours before

Local storm report, Dec 18, 10:23 AM CST, 4 hours 38 minutes before

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Nearby

Winter Storm Watches in North Dakota, 2017 Every winter storm watch 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.