Alert archive / Iowa / Mesoscale Discussions in 2005
Mesoscale Discussion 813
The Storm Prediction Center issued this mesoscale discussion at May 10, 2005, 11:35 PM CDT for 41 counties in Iowa. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2005, 11:35 PM CDT (04:35 UTC)
- Expired
- May 11, 2005, 1:00 AM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 41 counties
Adair County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Crawford County, IA, Dallas County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Warren County, IA, Washington County, IA, Webster County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 12 km from the middle of the area, began a volume at 04:36 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.6 hours before the alert went out and 230 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
- 2604 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1952 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 110435 SWOMCD SPC MCD 110435 ILZ000-IAZ000-110600- MESOSCALE DISCUSSION 0813 NWS STORM PREDICTION CENTER NORMAN OK 1135 PM CDT TUE MAY 10 2005 AREAS AFFECTED...ERN NEB...CNTRL/SRN IA CONCERNING...TORNADO WATCH 243... VALID 110435Z - 110600Z CONTINUE REMAINING VALID PORTION OF WW. NEW SEVERE WW MAY BE ISSUED ACROSS IOWA BEFORE 06Z. MUCH OF CONVECTIVE ACTIVITY NOW APPEARS TO BE DEVELOPING JUST TO COOL SIDE OF SURFACE FRONT...NEAR/EAST OF WAVE/MESO LOW WHICH REMAINS EVIDENT IN SURFACE DATA MIGRATING ACROSS THE OMAHA AREA INTO SOUTHWEST IOWA. SEVERAL GUSTS IN EXCESS OF 40 KT HAVE BEEN MEASURED NEAR CONVECTIVE CLUSTER ASSOCIATED WITH THIS FEATURE...WHICH MAY CONTINUE ACROSS THE DES MOINES AREA BY THE 06-07Z TIME FRAME. DOWNSTREAM CLUSTER OF STORMS...NOW APPROACHING DES MOINES...IS ALSO SHOWING INCREASING SIGNS OF DAMAGING WIND THREAT EASTWARD ALONG THE INTERSTATE 80 CORRIDOR NEXT COUPLE OF HOURS. FAVORABLE LARGE-SCALE FORCING FOR UPWARD VERTICAL MOTION/SHEAR AND INSTABILITY ALONG FRONTAL ZONE FAVOR CONTINUATION OF HAIL/DAMAGING WIND THREAT THROUGH MUCH OF THE NIGHT. ..KERR.. 05/11/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DVN...ARX...DMX...FSD...OAX... 41799583 42649534 42819324 42769163 41439074 41019170 41169362 41149531
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 7:30 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 26 more | 2 hr |
| May 10, 9:14 PM CDT | Mesoscale Discussion | SPC | Audubon, Black Hawk, Boone, Bremer, Buena Vista, Butler and 33 more | 2 hr |
| May 10, 9:54 PM CDT | Mesoscale Discussion | SPC | Allamakee, Cerro Gordo, Chickasaw, Clay, Clayton, Dickinson and 15 more | 2 hr |
| May 11, 3:11 AM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Johnson, Louisa, Muscatine, Scott and 1 more | 2 hr |
| May 11, 8:41 AM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Henry, Jefferson, Lee, Van Buren and 1 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2005Every mesoscale discussion in 2005
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.