Alert archive / Kansas / Mesoscale Discussions in 2009

Mesoscale Discussion 641

April 30, 2009Kit Carson County, Yuma County, Colorado; 5 counties in Kansas; Dundy County, Hitchcock County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2009, 12:04 AM MDT for Kit Carson County, Yuma County, Colorado; 5 counties in Kansas; Dundy County, Hitchcock County, Nebraska. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2009, 12:04 AM MDT (06:04 UTC)
Expired: Apr 30, 2009, 1:30 AM MDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Kit Carson County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Dundy County, NE, Hitchcock County, NE

The radar

The Goodland radar (KGLD), 36 km from the middle of the area, began a volume at 06:05 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 216Apr 30, 12:35 AM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 6.1 hours before the alert went out and 142 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: 247 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 2435 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 30, 12:36 AM MDT	Severe Thunderstorm Watch	SPC	Yuma	6 hr
Apr 30, 3:05 AM MDT	Mesoscale Discussion	SPC	Decatur, Graham, Jewell, Mitchell, Norton, Osborne and 4 more	85 min
Apr 29, 8:27 PM MDT	Mesoscale Discussion	SPC	Blaine, Boyd, Brown, Custer, Garfield, Holt and 7 more	93 min

Nearby

Mesoscale Discussions in Kansas, 2009 Mesoscale Discussions in Colorado, 2009 Mesoscale Discussions in Nebraska, 2009 Every mesoscale discussion in 2009

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.