Alert archive / Colorado / Mesoscale Discussions in 2003

Mesoscale Discussion 626

April 29, 200312 counties in Colorado; 8 counties in Kansas; Dundy County, Hitchcock County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 5:16 PM MDT for 12 counties in Colorado; 8 counties in Kansas; Dundy County, Hitchcock County, Nebraska. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2003, 5:16 PM MDT (23:16 UTC)
Expired: Apr 29, 2003, 7:15 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center

All 22 counties

Adams County, CO, Arapahoe County, CO, Cheyenne County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Kit Carson County, CO, Lincoln County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Logan County, KS, Rawlins County, KS, Scott County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Dundy County, NE, Hitchcock County, NE

The radar

The Denver radar (KFTG), 105 km from the middle of the area, began a volume at 23:20 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 185Apr 29, 7:45 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.3 hours before the alert went out and 13 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, 2:47 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Denver, Elbert, Logan, Morgan and 2 more	118 min
Apr 29, 3:10 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Cheyenne, Denver, Douglas, Elbert and 6 more	6 hr
Apr 28, 6:10 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 12 more	2 hr
Apr 29, 1:15 AM MDT	Mesoscale Discussion	SPC	Decatur, Jewell, Norton, Phillips, Rawlins, Republic and 2 more	3 hr
Apr 29, 1:19 PM MDT	Mesoscale Discussion	SPC	Cloud, Ellis, Ellsworth, Graham, Jewell, Lincoln and 11 more	116 min
Apr 29, 2:40 PM MDT	Tornado Watch	SPC	Clay, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 19 more	5 hr
Apr 29, 4:52 PM MDT	Mesoscale Discussion	SPC	Clay, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 19 more	53 min

Nearby

Mesoscale Discussions in Colorado, 2003 Mesoscale Discussions in Kansas, 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.