Alert archive / Iowa / Mesoscale Discussions in 2005

Mesoscale Discussion 2265

September 24, 200516 counties in Iowa; Clay County, Lincoln County, Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2005, 7:14 AM CDT for 16 counties in Iowa; Clay County, Lincoln County, Union County, South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 24, 2005, 7:14 AM CDT (12:14 UTC)
Expired: Sep 24, 2005, 9:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sioux County, IA, Wright County, IA, Clay County, SD, Lincoln County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 127 km from the middle of the area, began a volume at 12:15 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

Omaha, NE (KOAX), launched 12:00Z, 0.2 hours before the alert went out and 199 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: 58 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.5

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
Sep 24, 3:26 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more	94 min
Sep 24, 3:55 PM CDT	Tornado Watch	SPC	Cherokee, Harrison, Ida, Lyon, Monona, O'Brien and 5 more	7 hr
Sep 24, 1:03 AM CDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Buffalo, Charles Mix, Clay and 10 more	57 min

Nearby

Mesoscale Discussions in Iowa, 2005 Mesoscale Discussions in South Dakota, 2005 Every mesoscale discussion in 2005

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.