Alert archive / Nebraska / Wind Chill Advisories in 2009

Wind Chill Advisory 5, NWS North Platte, NE

December 9, 200926 counties in Nebraska

NWS North Platte, NE issued this wind chill advisory at Dec 9, 2009, 2:43 PM MST for 26 counties in Nebraska. It took effect at Dec 9, 2009, 6:00 PM MST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Dec 9, 2009, 2:43 PM MST (21:43 UTC)
In effect from: Dec 9, 2009, 6:00 PM MST
Expired: Dec 10, 2009, 8:49 AM MST
In force: 15 hr
Issued by: NWS North Platte, NE

All 26 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Hayes County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 25 km from the middle of the area, began a volume at 21:42 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

Denver, CO (KDNR), launched 12:00Z, 9.7 hours before the alert went out and 304 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: 1018 m above ground
0-6 km bulk shear: 86 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 260 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 wind chill advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS North Platte, NE wrote its last area forecast discussion before this wind chill advisory went out at Dec 8, 3:07 PM MST, 23 hours 36 minutes earlier.

Area forecast discussion, Dec 8, 3:07 PM MST, 23 hours 36 minutes before

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Nearby

Wind Chill Advisories in Nebraska, 2009 Every wind chill advisory in 2009

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.