Alert archive / Iowa / Mesoscale Discussions in 2003
Mesoscale Discussion 736
The Storm Prediction Center issued this mesoscale discussion at May 4, 2003, 3:56 PM CDT for 28 counties in Iowa; 12 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 4, 2003, 3:56 PM CDT (20:56 UTC)
- Expired
- May 4, 2003, 6:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 40 counties
Adair County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monona County, IA, Monroe County, IA, Polk County, IA, Shelby County, IA, Story County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Adair County, MO, Chariton County, MO, Grundy County, MO, Harrison County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO
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 12:00Z, 8.9 hours before the alert went out and 184 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 375 m²/s²
- 0-3 km storm-relative helicity
- 509 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
126 ACUS11 KWNS 042057 SWOMCD SPC MCD 042056 IAZ000-MOZ000-042300- MESOSCALE DISCUSSION 0736 NWS STORM PREDICTION CENTER NORMAN OK 0356 PM CDT SUN MAY 04 2003 AREAS AFFECTED...CNTRL/SRN IA...N CNTRL MO CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 042056Z - 042300Z SEVERE THREAT WILL INCREASE NORTHEAST OF TORNADO WATCH 233 BY EARLY EVENING. NEW WW MAY BE NEEDED ACROSS PARTS OF CENTRAL IOWA/NORTH CENTRAL MISSOURI WITHIN THE NEXT HOUR OR TWO. MODELS SUGGEST STRONGEST UPPER DIFLUENCE/DIVERGENCE CURRENTLY CENTERED OVER EASTERN NEBRASKA WILL CONTINUE TO SPREAD NORTHEASTWARD LATE THIS AFTERNOON...BECOMING FOCUSED OVER SOUTHWEST IOWA BY 05/00Z. THIS WILL CONTINUE TO ENHANCE CONVECTIVE DEVELOPMENT... MOST INTENSE OF WHICH NOW IS CURRENTLY APPROACHING THE OMAHA AREA... NEAR DEEPENING SURFACE CYCLONE. THREAT FOR TORNADIC SUPERCELLS WILL CONTINUE ANOTHER FEW HOURS NEAR THE MISSOURI RIVER...BUT A GRADUAL EVOLUTION OF LARGER MESOSCALE CONVECTIVE SYSTEM/SQUALL LINE IS LIKELY ALONG LEADING EDGE OF MID-LEVEL COOLING...WHICH WILL SPREAD INTO PARTS OF CENTRAL IOWA/MISSOURI BY EARLY EVENING. ..KERR.. 05/04/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LSX...DVN...DMX...EAX...FSD...OAX... 42139618 42339535 42159342 41519224 40459203 39649251 39059307 39909389 41109432 41369526 41479582
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 11:46 PM CDT | Mesoscale Discussion | SPC | Adams, Cass, Fremont, Harrison, Mills, Monona and 5 more | 59 min |
| May 4, 12:10 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Carroll, Cass and 18 more | 6 hr |
| May 4, 2:58 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Carroll and 37 more | 92 min |
| May 4, 4:50 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 23 more | 6 hr |
| May 4, 7:43 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 15 more | 2 hr |
| May 4, 9:48 AM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Carroll, Cass, Cherokee, Clay and 17 more | 117 min |
| May 4, 12:14 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie, Taylor | 2 hr |
| May 4, 12:45 PM CDT | Tornado Watch | SPC | Adams, Cass, Fremont, Mills, Montgomery, Page and 2 more | 6 hr |
| May 4, 2:22 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie, Taylor | 113 min |
| May 4, 5:25 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Davis, Des Moines, Lee, Van Buren | 6 hr |
| May 4, 5:50 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Clarke, Dallas, Decatur and 14 more | 5 hr |
| May 4, 12:35 PM CDT | Tornado Watch | SPC | Barry, Barton, Cedar, Dade, Jasper, Lawrence and 4 more | 6 hr |
| May 4, 3:05 PM CDT | Mesoscale Discussion | SPC | Barton, Jasper, McDonald, Newton | 115 min |
| May 4, 4:28 PM CDT | Mesoscale Discussion | SPC | Buchanan, Caldwell, Clay, Clinton, DeKalb, Jackson and 3 more | 62 min |
| May 4, 4:43 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Cedar, Dade, Jasper, Newton and 2 more | 2 hr |
| May 4, 5:01 PM CDT | Mesoscale Discussion | SPC | Butler, Dunklin, Mississippi, New Madrid, Pemiscot, Stoddard | 3 hr |
| May 4, 5:20 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Christian, Dade, Dallas and 18 more | 55 min |
| May 4, 6:05 PM CDT | Tornado Watch | SPC | Barry, Barton, Camden, Carter, Cedar, Christian and 30 more | 7 hr |
| May 4, 6:20 PM CDT | Tornado Watch | SPC | Andrew, Bates, Benton, Boone, Buchanan, Caldwell and 34 more | 6 hr |
| May 4, 6:55 PM CDT | Tornado Watch | SPC | Butler, Dunklin, Mississippi, New Madrid, Pemiscot, Scott and 2 more | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in Missouri, 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.