Alert archive / Colorado / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 50, NWS Denver/Boulder, CO

June 7, 2010Larimer County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 7, 2010, 4:08 PM MDT for Larimer County, Weld County, Colorado. It was in force for 12 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 7, 2010, 4:08 PM MDT (22:08 UTC)
Expired: Jun 7, 2010, 4:20 PM MDT
In force: 12 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Larimer County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 61 km from the middle of the area, began a volume at 22:12 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 7, 3:31 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.1 hours before the alert went out and 166 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: 1166 J/kg
Mixed-layer CIN: -339 J/kg
Mixed-layer LCL: 1244 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jun 7, 3:28 PM MDT, 40 minutes earlier.

Area forecast discussion, Jun 7, 3:28 PM MDT, 40 minutes before

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Hazardous weather outlook, Jun 7, 10:18 AM MDT, 5 hours 50 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
Jun 6, 6:10 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Weld	65 min
Jun 6, 6:15 PM MDT	Severe Thunderstorm Warning	BOU	Weld	45 min
Jun 6, 6:26 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	49 min
Jun 6, 6:29 PM MDT	Severe Thunderstorm Warning	BOU	Washington	19 min
Jun 6, 6:39 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	66 min
Jun 6, 7:01 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Weld	46 min
Jun 6, 7:15 PM MDT	Tornado Warning	BOU	Adams, Morgan, Washington	45 min
Jun 6, 7:16 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	30 min
Jun 6, 7:20 PM MDT	Flash Flood Warning	BOU	Morgan	2 hr
Jun 6, 7:28 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	32 min
Jun 6, 8:22 PM MDT	Severe Thunderstorm Warning	BOU	Washington	53 min
Jun 6, 8:32 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	43 min
Jun 6, 9:14 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	46 min
Jun 6, 11:33 PM MDT	Areal Flood Advisory	BOU	Grand	48 hr
Jun 7, 6:14 AM MDT	Special Weather Statement	BOU	Logan	46 min
Jun 7, 6:29 AM MDT	Severe Thunderstorm Warning	BOU	Logan	30 min
Jun 7, 10:00 AM MDT	River Flood Advisory	BOU	Grand, Larimer	3 days
Jun 7, 5:30 PM MDT	River Flood Advisory	BOU	Grand, Weld	4 days

Nearby

Severe Thunderstorm Warnings in Colorado, 2010 Every severe thunderstorm warning 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.