Alert archive / Nebraska / Winter Weather Advisories in 2021

Winter Weather Advisory 2, NWS Omaha, NE

January 15, 202122 counties in Nebraska; 8 counties in Iowa

NWS Omaha, NE issued this winter weather advisory at Jan 15, 2021, 2:10 PM CST for 22 counties in Nebraska; 8 counties in Iowa. It took effect at Jan 15, 2021, 3:00 PM CST. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jan 15, 2021, 2:10 PM CST (20:10 UTC)
In effect from: Jan 15, 2021, 3:00 PM CST
Expired: Jan 15, 2021, 7:00 PM CST
In force: 4 hr
Issued by: NWS Omaha, NE

All 30 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Burt County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Richardson County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 7 km from the middle of the area, began a volume at 20:14 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

Omaha, NE (KOAX), launched 12:00Z, 8.2 hours before the alert went out and 7 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: 494 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 344 m²/s²
0-3 km storm-relative helicity: 451 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 weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Omaha, NE wrote its last area forecast discussion before this winter weather advisory went out at Jan 15, 11:17 AM CST, 2 hours 53 minutes earlier.

Area forecast discussion, Jan 15, 11:17 AM CST, 2 hours 53 minutes before

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Hazardous weather outlook, Jan 15, 10:49 AM CST, 3 hours 21 minutes before

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In the hours before

Local storm report, Jan 15, 1:10 PM CST, 1 hour before

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Local storm report, Jan 15, 1:23 PM CST, 47 minutes before

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Local storm report, Jan 15, 1:30 PM CST, 40 minutes before

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Local storm report, Jan 15, 1:31 PM CST, 39 minutes before

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Local storm report, Jan 15, 1:47 PM CST, 23 minutes before

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Local storm report, Jan 15, 2:00 PM CST, 10 minutes before

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Nearby

Winter Weather Advisories in Nebraska, 2021 Winter Weather Advisories in Iowa, 2021 Every winter weather advisory in 2021

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.