Alert archive / Missouri / Mesoscale Discussions in 2007

Mesoscale Discussion 301

March 21, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2007, 9:44 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 21, 2007, 9:44 AM CDT (14:44 UTC)
Expired
Mar 21, 2007, 11:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 66 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Jasper County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Hancock County, IL, Henderson County, IL, Doniphan County, KS, Adair County, MO, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Nodaway County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 120 km from the middle of the area, began a volume at 14:45 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 2.7 hours before the alert went out and 254 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2007-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2007-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 261 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
261 m²/s²
0-3 km storm-relative helicity
275 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.

IssuedProductOfficeCountiesLasted
Mar 21, 12:30 PM CDTMesoscale DiscussionSPCBoone, Carroll, Henry, Jo Daviess, Knox, Lee and 7 more90 min
Mar 21, 1:26 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Henry, Jo Daviess, Lee and 7 more64 min
Mar 21, 5:15 PM CDTMesoscale DiscussionSPCBoone, Cook, DuPage, Kane, Lake, McHenry and 1 more2 hr
Mar 21, 6:37 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Butler and 36 more113 min
Mar 21, 10:24 AM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 31 more5 hr
Mar 21, 12:58 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Lee, Van Buren62 min
Mar 21, 4:57 PM CDTMesoscale DiscussionSPCCrawford, Fremont, Harrison, Ida, Mills, Monona and 3 more63 min
Mar 21, 5:15 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 34 more7 hr

Nearby

Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Illinois, 2007Every mesoscale discussion in 2007

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.