Alert archive / Iowa / Mesoscale Discussions in 2019
Mesoscale Discussion 1549
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2019, 4:40 PM CDT for 27 counties in Iowa. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2019, 4:40 PM CDT (21:40 UTC)
- Expired
- Jul 20, 2019, 6:15 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 27 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Jasper County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Montgomery County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Shelby County, IA, Story County, IA, Union County, IA, Wapello County, IA, Warren County, IA
The radar
The Des Moines radar (KDMX), 35 km from the middle of the area, began a volume at 21:42 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
Omaha, NE (KOAX), launched 12:00Z, 9.7 hours before the alert went out and 193 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
- 854 J/kg
- Mixed-layer CIN
- -500 J/kg
- Mixed-layer LCL
- 2014 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:02 AM CDT | Mesoscale Discussion | SPC | Dickinson, Emmet, Lyon, Osceola | 88 min |
| Jul 20, 5:51 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 5 hr |
| Jul 20, 7:40 AM CDT | Mesoscale Discussion | SPC | Cerro Gordo, Chickasaw, Clay, Dickinson, Emmet, Floyd and 12 more | 95 min |
| Jul 20, 9:05 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 15 more | 7 hr |
| Jul 20, 10:05 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Butler, Cerro Gordo, Chickasaw, Emmet, Floyd and 14 more | 115 min |
| Jul 20, 4:58 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Cass, Cedar and 30 more | 5 hr |
| Jul 20, 6:54 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 11 more | 66 min |
Nearby
Mesoscale Discussions in Iowa, 2019Every mesoscale discussion in 2019
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.