Alert archive / Colorado / Snow Advisories in 2007

Snow Advisory 8, NWS Denver/Boulder, CO

April 13, 20074 counties in Colorado

NWS Denver/Boulder, CO issued this snow advisory at Apr 13, 2007, 11:25 AM MDT for 4 counties in Colorado. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Apr 13, 2007, 11:25 AM MDT (17:25 UTC)
Expired: Apr 13, 2007, 3:46 PM MDT
In force: 4 hr
Issued by: NWS Denver/Boulder, CO

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

The radar

The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 17:31 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, 5.4 hours before the alert went out and 106 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: 559 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 33 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 snow 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 snow advisory went out at Apr 12, 2:40 PM MDT, 20 hours 45 minutes earlier.

Area forecast discussion, Apr 12, 2:40 PM MDT, 20 hours 45 minutes before

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Nearby

Snow Advisories in Colorado, 2007 Every snow advisory in 2007

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.