Alert archive / Colorado / Wind Chill Advisories in 2010

Wind Chill Advisory 2, NWS Denver/Boulder, CO

December 31, 2010Arapahoe County, Douglas County, Elbert County, Colorado

NWS Denver/Boulder, CO issued this wind chill advisory at Dec 31, 2010, 6:09 AM MST for Arapahoe County, Douglas County, Elbert County, Colorado. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Dec 31, 2010, 6:09 AM MST (13:09 UTC)
Expired: Dec 31, 2010, 12:00 PM MST
In force: 6 hr
Issued by: NWS Denver/Boulder, CO

Counties Arapahoe County, CO, Douglas County, CO, Elbert County, CO

The radar

The Denver radar (KFTG), 41 km from the middle of the area, began a volume at 13:10 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, 1.2 hours before the alert went out and 117 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: 23 kt
0-1 km storm-relative helicity: -90 m²/s²
0-3 km storm-relative helicity: -115 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 Denver/Boulder, CO wrote its last area forecast discussion before this wind chill advisory went out at Dec 31, 3:55 AM MST, 2 hours 14 minutes earlier.

Area forecast discussion, Dec 31, 3:55 AM MST, 2 hours 14 minutes before

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Hazardous weather outlook, Dec 31, 5:09 AM MST, 1 hour before

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In the hours before

Local storm report, Dec 31, 2:01 AM MST, 4 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
201 AM MST FRI DEC 31 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0157 AM     HEAVY SNOW       ILIFF                   40.76N 103.07W
12/31/2010  E9.0 INCH        LOGAN              CO   TRAINED SPOTTER

            100 YARD VISIBILITY WITH BLOWING SNOW.

1205 AM     SNOW             3 W JAMESTOWN           40.11N 105.44W
12/31/2010  M5.0 INCH        BOULDER            CO   TRAINED SPOTTER

1128 PM     SNOW             4 N LOVELAND            40.48N 105.07W
12/30/2010  M4.9 INCH        LARIMER            CO   TRAINED SPOTTER

1005 PM     SNOW             12 SE AURORA            39.58N 104.65W
12/30/2010  M4.6 INCH        ARAPAHOE           CO   TRAINED SPOTTER

1000 PM     SNOW             5 E BOULDER             40.03N 105.16W
12/30/2010  M5.5 INCH        BOULDER            CO   TRAINED SPOTTER

1000 PM     HEAVY SNOW       2 SW GOLDEN             39.71N 105.25W
12/30/2010  M8.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

0955 PM     HEAVY SNOW       3 S BOULDER             39.98N 105.25W
12/30/2010  M8.2 INCH        BOULDER            CO   TRAINED SPOTTER

0937 PM     SNOW             1 W NORTHGLENN          39.91N 104.99W
12/30/2010  M3.0 INCH        ADAMS              CO   TRAINED SPOTTER

0930 PM     SNOW             12 NW GOLDEN            39.86N 105.38W
12/30/2010  M3.5 INCH        JEFFERSON          CO   TRAINED SPOTTER

0929 PM     SNOW             3 E HIGHLANDS RANCH     39.55N 104.92W
12/30/2010  M4.0 INCH        DOUGLAS            CO   TRAINED SPOTTER

0919 PM     SNOW             3 NNE BAILEY            39.43N 105.44W
12/30/2010  M4.5 INCH        PARK               CO   TRAINED SPOTTER

0916 PM     SNOW             1 SW WESTMINSTER        39.87N 105.06W
12/30/2010  M3.4 INCH        JEFFERSON          CO   TRAINED SPOTTER

0912 PM     SNOW             3 WSW CONIFER           39.50N 105.35W
12/30/2010  M5.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

0912 PM     HEAVY SNOW       GENESEE                 39.69N 105.27W
12/30/2010  M6.3 INCH        JEFFERSON          CO   TRAINED SPOTTER

0906 PM     HEAVY SNOW       4 S EVERGREEN           39.58N 105.34W
12/30/2010  M6.5 INCH        JEFFERSON          CO   TRAINED SPOTTER

0906 PM     SNOW             ILIFF                   40.76N 103.07W
12/30/2010  M5.5 INCH        LOGAN              CO   TRAINED SPOTTER

0855 PM     SNOW             HIGHLANDS RANCH         39.55N 104.97W
12/30/2010  M3.0 INCH        DOUGLAS            CO   TRAINED SPOTTER

0812 PM     SNOW             5 NW DENVER             39.77N 105.03W
12/30/2010  M3.1 INCH        DENVER             CO   TRAINED SPOTTER

0811 PM     SNOW             2 SSE FEDERAL HEIGHTS   39.84N 105.00W
12/30/2010  M2.0 INCH        ADAMS              CO   TRAINED SPOTTER

0801 PM     SNOW             4 WNW NUNN              40.73N 104.85W
12/30/2010  M2.7 INCH        WELD               CO   TRAINED SPOTTER

0801 PM     SNOW             GREENWOOD VILLAGE       39.62N 104.92W
12/30/2010  M3.7 INCH        ARAPAHOE           CO   TRAINED SPOTTER

0720 PM     SNOW             2 SW BOULDER            40.01N 105.28W
12/30/2010  M5.6 INCH        BOULDER            CO   NWS EMPLOYEE

            DAVID SKAGGS RESEARCH BUILDING

0710 PM     SNOW             3 W GREELEY             40.42N 104.80W
12/30/2010  M3.8 INCH        WELD               CO   NWS EMPLOYEE

0703 PM     SNOW             1 SE FORT COLLINS       40.55N 105.05W
12/30/2010  M3.0 INCH        LARIMER            CO   TRAINED SPOTTER

0700 PM     SNOW             FORT COLLINS            40.56N 105.07W
12/30/2010  M3.7 INCH        LARIMER            CO   CO-OP OBSERVER

0646 PM     HEAVY SNOW       KEN CARYL               39.58N 105.11W
12/30/2010  M6.1 INCH        JEFFERSON          CO   TRAINED SPOTTER

0641 PM     SNOW             3 NNE BAILEY            39.43N 105.44W
12/30/2010  M4.0 INCH        PARK               CO   TRAINED SPOTTER

0605 PM     SNOW             1 NNW EVERGREEN         39.65N 105.35W
12/30/2010  M3.7 INCH        JEFFERSON          CO   TRAINED SPOTTER

0555 PM     SNOW             N LONGMONT              40.17N 105.11W
12/30/2010  M3.3 INCH        BOULDER            CO   TRAINED SPOTTER

0547 PM     SNOW             6 NE THORNTON           39.95N 104.87W
12/30/2010  M2.5 INCH        ADAMS              CO   NWS EMPLOYEE

0546 PM     SNOW             4 S EVERGREEN           39.58N 105.34W
12/30/2010  M5.8 INCH        JEFFERSON          CO   TRAINED SPOTTER

0530 PM     SNOW             WHEAT RIDGE             39.77N 105.10W
12/30/2010  M3.2 INCH        JEFFERSON          CO   TRAINED SPOTTER

0518 PM     SNOW             7 SW BOULDER            39.96N 105.34W
12/30/2010  M5.0 INCH        BOULDER            CO   TRAINED SPOTTER

0510 PM     HEAVY SNOW       2 SW BOULDER            40.01N 105.28W
12/30/2010  M6.2 INCH        BOULDER            CO   CO-OP OBSERVER

0500 PM     SNOW             6 NW LYONS              40.28N 105.35W
12/30/2010  M5.0 INCH        LARIMER            CO   TRAINED SPOTTER

0430 PM     SNOW             WATKINS                 39.75N 104.60W
12/30/2010  M2.0 INCH        ADAMS              CO   TRAINED SPOTTER

0430 PM     SNOW             2 ESE GREELEY           40.40N 104.70W
12/30/2010  M2.7 INCH        WELD               CO   TRAINED SPOTTER

0430 PM     SNOW             NNW ASPEN SPRINGS       39.84N 105.48W
12/30/2010  M4.2 INCH        GILPIN             CO   TRAINED SPOTTER

0430 PM     HEAVY SNOW       3 SW GOLDEN             39.71N 105.25W
12/30/2010  M7.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

0430 PM     SNOW             4 NNW CASTLE ROCK       39.43N 104.88W
12/30/2010  M1.7 INCH        DOUGLAS            CO   TRAINED SPOTTER

0415 PM     SNOW             GENESEE                 39.69N 105.27W
12/30/2010  M5.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

0400 PM     SNOW             4 ENE NEDERLAND         39.98N 105.44W
12/30/2010  M5.5 INCH        BOULDER            CO   TRAINED SPOTTER

0400 PM     SNOW             2 SW BOULDER            40.01N 105.28W
12/30/2010  M5.0 INCH        BOULDER            CO   NWS EMPLOYEE

            DAVID SKAGGS RESEARCH CENTER

0330 PM     SNOW             SE HIGHLANDS RANCH      39.55N 104.97W
12/30/2010  M2.0 INCH        DOUGLAS            CO   TRAINED SPOTTER

0330 PM     SNOW             3 NNE BAILEY            39.43N 105.44W
12/30/2010  M3.0 INCH        PARK               CO   TRAINED SPOTTER

0325 PM     SNOW             2 NNE LITTLETON         39.62N 105.00W
12/30/2010  M3.0 INCH        ARAPAHOE           CO   TRAINED SPOTTER

0305 PM     SNOW             4 S EVERGREEN           39.58N 105.34W
12/30/2010  M5.4 INCH        JEFFERSON          CO   TRAINED SPOTTER

0239 PM     SNOW             3 WSW CONIFER           39.50N 105.35W
12/30/2010  M4.0 INCH        JEFFERSON          CO   TRAINED SPOTTER

0230 PM     SNOW             NNE JULESBURG           40.99N 102.26W
12/30/2010  M2.5 INCH        SEDGWICK           CO   TRAINED SPOTTER

&&

DB

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 2:57 AM MST	Blizzard Warning	BOU	Logan, Phillips, Sedgwick	9 hr
Dec 31, 2:45 PM MST	Wind Chill Warning	BOU	Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 4 more	19 hr
Dec 31, 2:45 PM MST	Wind Chill Advisory	BOU	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 10 more	19 hr

Nearby

Wind Chill Advisories in Colorado, 2010 Every wind chill advisory in 2010

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.