Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 414

April 2, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2007, 11:40 PM CDT for 4 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Apr 2, 2007, 11:40 PM CDT (04:40 UTC)
Expired
Apr 3, 2007, 12:45 AM CDT
In force
65 min
Issued by
the Storm Prediction Center
All 41 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Fremont County, IA, Harrison County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Shawnee County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Omaha radar (KOAX), 133 km from the middle of the area, began a volume at 04:42 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

Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 133 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, Omaha, NE at 00:00Z on 2007-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 74 joules per kilogram.LCLLFCEL10008507005003002001001 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, Omaha, NE at 00:00Z on 2007-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 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
74 J/kg
Mixed-layer CIN
-377 J/kg
Mixed-layer LCL
1481 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
516 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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
Apr 2, 8:05 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 86 more115 min
Apr 2, 9:22 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 46 more8 hr
Apr 2, 11:33 PM CDTMesoscale DiscussionSPCBlack Hawk, Bremer, Buchanan, Butler, Calhoun, Clayton and 17 more57 min
Apr 3, 12:03 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more7 hr
Apr 3, 1:27 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 49 more93 min
Apr 3, 2:22 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more53 min
Apr 3, 4:05 AM CDTMesoscale DiscussionSPCDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 3 more55 min
Apr 3, 4:19 AM CDTSevere Thunderstorm WatchSPCCedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more6 hr
Apr 2, 7:52 PM CDTMesoscale DiscussionSPCRepublic83 min
Apr 3, 4:28 AM CDTMesoscale DiscussionSPCDouglas, Franklin, Jefferson, Johnson, Leavenworth, Lyon and 6 more62 min
Apr 3, 7:17 AM CDTMesoscale DiscussionSPCAnderson, Franklin, Johnson, Linn, Miami88 min
Apr 3, 7:37 AM CDTSevere Thunderstorm WatchSPCAudrain, Bates, Benton, Boone, Callaway, Camden and 30 more8 hr
Apr 3, 9:08 AM CDTMesoscale DiscussionSPCSaint Louis, City of Saint Louis67 min
Apr 3, 9:46 AM CDTMesoscale DiscussionSPCAudrain, Bates, Benton, Boone, Callaway, Camden and 37 more29 min
Apr 3, 11:04 AM CDTMesoscale DiscussionSPCBarry, Barton, Benton, Bollinger, Boone, Butler and 62 more26 min
Apr 3, 11:51 AM CDTTornado WatchSPCBarry, Barton, Bollinger, Butler, Camden, Cape Girardeau and 50 more8 hr
Apr 3, 2:17 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot118 min
Apr 3, 2:25 PM CDTMesoscale DiscussionSPCBarry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 39 more65 min
Apr 3, 3:12 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
Apr 2, 8:25 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Boone, Buffalo, Burt, Butler and 32 more6 hr
Apr 2, 10:06 PM CDTMesoscale DiscussionSPCBoone, Butler, Cass, Colfax, Dodge, Douglas and 12 more54 min

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Kansas, 2007Mesoscale Discussions in Missouri, 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.