Alert archive / Colorado / Mesoscale Discussions in 2003

Mesoscale Discussion 622

April 29, 20038 counties in Colorado; Kimball County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 2:47 PM MDT for 8 counties in Colorado; Kimball County, Nebraska. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2003, 2:47 PM MDT (20:47 UTC)
Expired: Apr 29, 2003, 4:45 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Adams County, CO, Arapahoe County, CO, Denver County, CO, Elbert County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Kimball County, NE

The radar

The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 20:49 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 182Apr 29, 3:10 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.8 hours before the alert went out and 64 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: 44 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1226 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 10:50 PM MDT	Mesoscale Discussion	SPC	Yuma	2 hr
Apr 29, 3:10 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Cheyenne, Denver, Douglas, Elbert and 6 more	6 hr
Apr 29, 5:16 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Cheyenne, Denver, Douglas, Elbert and 6 more	119 min
Apr 29, 1:15 AM MDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Dawson, Dundy, Fillmore and 19 more	3 hr
Apr 29, 1:19 PM MDT	Mesoscale Discussion	SPC	Franklin, Furnas, Harlan, Nuckolls, Thayer, Webster	116 min
Apr 29, 2:40 PM MDT	Tornado Watch	SPC	Franklin, Furnas, Harlan, Red Willow	5 hr
Apr 29, 4:52 PM MDT	Mesoscale Discussion	SPC	Franklin, Furnas, Harlan, Red Willow	53 min

Nearby

Mesoscale Discussions in Colorado, 2003 Mesoscale Discussions in Nebraska, 2003 Every mesoscale discussion in 2003

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.