Alert archive / Colorado / Winter Storm Warnings in 2019

Winter Storm Warning 17, NWS Denver/Boulder, CO

November 24, 201922 counties in Colorado

NWS Denver/Boulder, CO issued this winter storm warning at Nov 24, 2019, 1:40 PM MST for 22 counties in Colorado. It took effect at Nov 25, 2019, 3:00 PM MST. It was in force for 26 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 24, 2019, 1:40 PM MST (20:40 UTC)
In effect from: Nov 25, 2019, 3:00 PM MST
Expired: Nov 26, 2019, 5:00 PM MST
In force: 26 hr
Issued by: NWS Denver/Boulder, CO

All 22 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Summit County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 21 km from the middle of the area, began a volume at 20:41 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, 8.7 hours before the alert went out and 120 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: 3772 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 141 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 warning 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 winter storm warning went out at Nov 24, 9:56 AM MST, 3 hours 44 minutes earlier.

Area forecast discussion, Nov 24, 9:56 AM MST, 3 hours 44 minutes before

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Hazardous weather outlook, Nov 24, 10:17 AM MST, 3 hours 23 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 24, 4:38 AM MST	Winter Storm Watch	BOU	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 16 more	9 hr
Nov 24, 1:40 PM MST	Winter Weather Advisory	BOU	Adams, Arapahoe, Douglas, Elbert, Grand, Jackson and 7 more	51 hr

Nearby

Winter Storm Warnings in Colorado, 2019 Every winter storm warning in 2019

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.