Alert archive / Minnesota / Winter Storm Watches in 2018

Winter Storm Watch 7, NWS Grand Forks, ND

December 25, 201818 counties in Minnesota; 12 counties in North Dakota

NWS Grand Forks, ND issued this winter storm watch at Dec 25, 2018, 4:06 AM CST for 18 counties in Minnesota; 12 counties in North Dakota. It took effect at Dec 26, 2018, 12:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 25, 2018, 4:06 AM CST (10:06 UTC)
In effect from: Dec 26, 2018, 12:00 PM CST
Expired: Dec 25, 2018, 3:11 PM CST
In force
Issued by: NWS Grand Forks, ND

All 30 counties

Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard County, MN, Kittson County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Pembina County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 58 km from the middle of the area, began a volume at 10:07 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, 10.1 hours before the alert went out and 315 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: 1385 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 236 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 Grand Forks, ND wrote its last area forecast discussion before this winter storm watch went out at Dec 25, 3:35 AM CST, 31 minutes earlier.

Area forecast discussion, Dec 25, 3:35 AM CST, 31 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
Dec 25, 3:11 PM CST	Winter Storm Warning	FGF	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 12 more	61 hr
Dec 25, 4:06 AM CST	Winter Weather Advisory	FGF	Benson, Cavalier, Eddy, Ramsey, Towner	23 hr

Nearby

Winter Storm Watches in Minnesota, 2018 Winter Storm Watches in North Dakota, 2018 Every winter storm watch in 2018

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.