Alert archive / Missouri / Mesoscale Discussions in 2007

Mesoscale Discussion 231

March 1, 200724 counties in Arkansas; 7 counties in Illinois; 33 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2007, 3:35 AM CST for 24 counties in Arkansas; 7 counties in Illinois; 33 counties in Missouri. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Mar 1, 2007, 3:35 AM CST (09:35 UTC)
Expired
Mar 1, 2007, 4:30 AM CST
In force
55 min
Issued by
the Storm Prediction Center
All 64 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Poinsett County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Clinton County, IL, Jackson County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Dunklin County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Perry County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Wright County, MO

The radar

The Memphis radar (KNQA), 173 km from the middle of the area, began a volume at 09:37 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

Little Rock, AR (KLZK), launched 00:00Z, 9.6 hours before the alert went out and 223 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, Little Rock, AR at 00:00Z on 2007-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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, Little Rock, AR at 00:00Z on 2007-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.1939587897117136Sfc1 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
37 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
833 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
183 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 1, 12:12 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Bradley, Chicot, Clay and 36 more2 hr
Mar 1, 1:32 AM CSTTornado WatchSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 7 more6 hr
Mar 1, 3:58 AM CSTTornado WatchSPCBaxter, Clay, Cleburne, Conway, Craighead, Faulkner and 18 more8 hr
Mar 1, 5:23 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more97 min
Mar 1, 6:17 AM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more7 hr
Mar 1, 6:54 AM CSTMesoscale DiscussionSPCCrittenden, Cross, Lee, Phillips, St. Francis66 min
Mar 1, 7:28 AM CSTTornado Watch PDSSPCCrittenden, Cross, Lee, Mississippi, Phillips, St. Francis12 hr
Feb 28, 10:30 PM CSTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, Henderson and 5 more90 min
Feb 28, 11:48 PM CSTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Greene, Jersey and 5 more57 min
Mar 1, 12:16 AM CSTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more6 hr
Mar 1, 1:05 AM CSTSevere Thunderstorm WatchSPCGallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more7 hr
Mar 1, 2:28 AM CSTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Greene and 11 more92 min
Mar 1, 4:18 AM CSTMesoscale DiscussionSPCGallatin, Hardin, Johnson, Massac, Pope, Saline117 min
Mar 1, 8:40 AM CSTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 27 more9 hr
Mar 1, 10:24 AM CSTMesoscale DiscussionSPCBrown, Bureau, Cass, Cook, DeKalb, DeWitt and 28 more96 min
Mar 1, 11:25 AM CSTSevere Thunderstorm WatchSPCBoone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more6 hr
Mar 1, 12:48 PM CSTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 28 more117 min
Mar 1, 1:47 PM CSTMesoscale DiscussionSPCCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more88 min
Feb 28, 6:11 PM CSTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Clay, Clinton, Daviess and 10 more94 min
Feb 28, 6:37 PM CSTSevere Thunderstorm WatchSPCAdair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 16 more7 hr
Feb 28, 6:50 PM CSTMesoscale DiscussionSPCBarton, Bates, Cass, Cedar, Dade, Henry and 7 more85 min
Feb 28, 7:10 PM CSTTornado WatchSPCBates, Benton, Cass, Cedar, Cooper, Henry and 6 more7 hr
Feb 28, 9:48 PM CSTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Camden, Cass and 17 more87 min

Nearby

Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Arkansas, 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.