Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 2213
The Storm Prediction Center issued this mesoscale discussion at Sep 15, 2004, 4:00 AM CDT for 43 counties in Iowa; Atchison County, Nodaway County, Worth County, Missouri; 4 counties in Nebraska. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 15, 2004, 4:00 AM CDT (09:00 UTC)
- Expired
- Sep 15, 2004, 6:30 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 50 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE
The radar
The Des Moines radar (KDMX), 99 km from the middle of the area, began a volume at 09:00 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, 9.0 hours before the alert went out and 146 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
- 1520 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1898 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 290 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 8.2
The text
As transmitted, in the capitals the NWS used until 2016.
111 ACUS11 KWNS 150903 SWOMCD SPC MCD 150900 IAZ000-MOZ000-NEZ000-151130- MESOSCALE DISCUSSION 2213 NWS STORM PREDICTION CENTER NORMAN OK 0400 AM CDT WED SEP 15 2004 AREAS AFFECTED...ERN NEB INTO SWRN IA AND NRN MO CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 150900Z - 151130Z NEARLY SOLID LINE OF DEEP CONVECTION WILL CONTINUE MOVING EAST AT 40KT ACROSS THE MO RIVER EARLY TODAY. 40-50KT WINDS MAY ACCOMPANY THE PASSAGE OF THE SQUALL LINE. TIME OF DAY AND BORDERLINE NATURE OF THE SEVERE WIND THREAT SUGGESTS A WATCH IS UNNECESSARY DESPITE STRONG FORCING TO MAINTAIN TSTMS ACROSS THE REGION. POTENT UPPER TROUGH WITH 50-60KT MID LEVEL FLOW WAS SPREADING EAST ACROSS THE CNTRL PLAINS EARLY TODAY. ASSOCIATED SURFACE LOW OVER NWRN IA WILL CONTINUE TO DEEPEN WHILE TRACKING INTO SWRN MN. AS THIS OCCURS...TRAILING COLD FRONT/SQUALL LINE WILL SWEEP EWD/SEWD INTO INSTABILITY AXIS ACROSS ERN NEB AND SWRN IA. STRONG DYNAMIC FORCING ASSOCIATED WITH THE DEEPENING LOW...IN ADDITION TO MATURE CONVECTIVE COLD POOL BEHIND THE SQUALL LINE...SHOULD MAINTAIN DEEP CONVECTION ALONG THE ADVANCING FRONT. UPDRAFTS ASSOCIATED WITH STORM SCALE BOUNDARY INTERSECTIONS ALONG THE LINE HAVE RESULTED IN OCCASIONAL GUSTS TO AROUND 50KT ACROSS SRN NEB OVER THE PAST COUPLE OF HOURS. EXPECT THIS POTENTIAL TO PERSIST ALONG SMALL SEGMENTS THE LINE AS IT MOVES EAST INTO IA. HOWEVER...IT APPEARS MOST TSTM GUSTS SHOULD REMAIN IN THE 40-50KT RANGE AND A WATCH MAY NOT BE NEEDED UNLESS A MORE WIDESPREAD/HIGHER WIND THREAT DEVELOPS. ..CARBIN.. 09/15/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DVN...DMX...EAX...FSD...OAX... 40289452 40119677 41039613 42079573 42389488 42549179 40599272
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 7:17 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 32 more | 118 min |
| Sep 14, 8:16 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Howard, Mitchell, Winneshiek | 3 hr |
| Sep 15, 12:25 PM CDT | Tornado Watch | SPC | Allamakee, Bremer, Butler, Chickasaw, Clayton, Fayette and 4 more | 8 hr |
| Sep 15, 2:34 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Camden, Carroll and 30 more | 86 min |
| Sep 14, 7:35 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Blaine, Boone, Buffalo, Clay and 37 more | 6 hr |
| Sep 14, 9:25 PM CDT | Severe Thunderstorm Watch | SPC | Dundy, Furnas, Hitchcock, Red Willow | 5 hr |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Missouri, 2004Every mesoscale discussion in 2004
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.