Alert archive / Missouri / Mesoscale Discussions in 2003

Mesoscale Discussion 647

April 30, 20036 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2003, 7:31 PM CDT for 6 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 7:31 PM CDT (00:31 UTC)
Expired
Apr 30, 2003, 9:30 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 113 counties

Appanoose County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Page County, IA, Ringgold County, IA, Scott County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Hancock County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Whitley County, IN, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI, Adair County, MO, Andrew County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Jackson County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Ray County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO, Worth County, MO

The radar

The Quad Cities radar (KDVN), 87 km from the middle of the area, began a volume at 00:34 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 00:00Z, 0.5 hours before the alert went out and 89 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 00:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1022 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, Davenport, at 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 457 square meters per square second.19395878Sfc1 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
1022 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
839 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
457 m²/s²
0-3 km storm-relative helicity
611 m²/s²
Significant tornado parameter
0.0
Supercell composite
12.6

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.

IssuedProductOfficeCountiesLasted
Apr 30, 10:31 PM CDTMesoscale DiscussionSPCAdams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more89 min
Apr 30, 10:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, DeWitt, Ford, Fulton and 22 more5 hr
May 1, 1:19 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, DeWitt, Ford, Fulton and 18 more86 min
May 1, 7:51 AM CDTMesoscale DiscussionSPCAlexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 14 more114 min
May 1, 9:35 AM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 9 more5 hr
May 1, 12:15 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin5 hr
May 1, 12:09 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 26 more3 hr
May 1, 12:50 PM CDTSevere Thunderstorm WatchSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 43 more5 hr
May 1, 3:10 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 35 more95 min
Apr 30, 7:30 PM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Atchison, Butler, Chase, Chautauqua and 23 more6 hr
Apr 30, 9:22 PM CDTMesoscale DiscussionSPCBourbon, Crawford, Linn, Miami83 min
Apr 30, 9:30 PM CDTSevere Thunderstorm WatchSPCBourbon, Cherokee, Crawford, Johnson, Leavenworth, Linn and 2 more6 hr
Apr 30, 9:52 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Butler, Chase, Chautauqua and 23 more83 min
Apr 30, 11:47 PM CDTMesoscale DiscussionSPCAllen, Anderson, Butler, Chase, Chautauqua, Coffey and 13 more118 min
May 1, 12:00 AM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Johnson, Leavenworth, Linn and 2 more90 min
May 1, 12:10 AM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Bourbon, Butler, Chase, Chautauqua and 22 more5 hr
May 1, 2:27 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 10 more2 hr
May 1, 12:58 PM CDTMesoscale DiscussionSPCCheyenne, Rawlins, Sherman, Wallace2 hr
Apr 30, 8:48 PM CDTMesoscale DiscussionSPCLenawee, Monroe87 min
Apr 30, 11:28 PM CDTMesoscale DiscussionSPCBarry, Calhoun, Clinton, Eaton, Genesee, Gratiot and 16 more92 min

Nearby

Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Illinois, 2003Every mesoscale discussion in 2003

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.