Alert archive / Iowa / Mesoscale Discussions in 2024
Mesoscale Discussion 1621
The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2024, 7:51 PM CDT for 21 counties in Illinois; 31 counties in Iowa; 7 counties in Wisconsin. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jul 14, 2024, 7:51 PM CDT (00:51 UTC)
- Expired
- Jul 14, 2024, 9:15 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 534
All 59 counties
Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Marshall County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Worth County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Grant County, WI, Green County, WI, Iowa County, WI, Kenosha County, WI, Lafayette County, WI, Rock County, WI, Walworth County, WI
The radar
The Quad Cities radar (KDVN), 114 km from the middle of the area, began a volume at 00:54 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
Davenport, (KDVN), launched 00:00Z, 0.9 hours before the alert went out and 117 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
- 3951 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 10.3
The text
As transmitted.
389 ACUS11 KWNS 150051 SWOMCD SPC MCD 150051 ILZ000-WIZ000-IAZ000-150215- Mesoscale Discussion 1621 NWS Storm Prediction Center Norman OK 0751 PM CDT Sun Jul 14 2024 Areas affected...Upper Midwest Concerning...Severe Thunderstorm Watch 534... Valid 150051Z - 150215Z The severe weather threat for Severe Thunderstorm Watch 534 continues. SUMMARY...Severe threat will spread across northern Illinois/southern Wisconsin this evening. DISCUSSION...Remnant MCV, from an early-day MCS, is moving east-southeast across central IA. Latest radar/satellite imagery suggests this long-lived feature is located northwest of CID. Over the last hour or so, considerable amount of convection has developed, possibly in response to this MCV. While a few supercells are currently observed from southwest WI, arcing southwest along the MS River through the middle portions of ww534, a new MCS may soon evolve. This developing complex is expected to propagate toward southern Lake MI with an attendant risk for hail/wind. ..Darrow.. 07/15/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LOT...MKX...DVN...ARX...DMX... LAT...LON 43429365 42828780 41098780 41679366 43429365
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 9:36 PM CDT | Mesoscale Discussion | SPC | Cook, DuPage, Kankakee, Kendall, Lake, Will | 54 min |
| Jul 14, 10:52 PM CDT | Mesoscale Discussion | SPC | Bureau, Ford, Grundy, Henry, Iroquois, Knox and 9 more | 83 min |
| Jul 14, 11:59 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Coles, DeWitt, Douglas, Edgar, Logan and 4 more | 4 hr |
| Jul 15, 12:54 AM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Ford, Fulton, Grundy, Iroquois and 14 more | 2 hr |
| Jul 15, 1:59 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 32 more | 3 hr |
| Jul 15, 3:18 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Fulton, Hancock, Henderson, Henry and 18 more | 8 hr |
| Jul 15, 5:26 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Fulton, Hancock and 19 more | 2 hr |
| Jul 15, 6:06 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Champaign, Cook, DeKalb, DeWitt and 26 more | 114 min |
| Jul 15, 6:53 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cass, Champaign, Cook and 39 more | 6 hr |
| Jul 15, 6:55 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henry, Knox, Lee, Mercer and 6 more | 95 min |
| Jul 15, 3:06 PM CDT | Mesoscale Discussion | SPC | Ashland, Bayfield, Burnett, Douglas, Florence, Forest and 8 more | 114 min |
Nearby
Mesoscale Discussions in Iowa, 2024Mesoscale Discussions in Illinois, 2024Mesoscale Discussions in Wisconsin, 2024Every mesoscale discussion in 2024
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.