Alert archive / Iowa / Mesoscale Discussions in 2019
Mesoscale Discussion 540
The Storm Prediction Center issued this mesoscale discussion at May 5, 2019, 1:35 PM CDT for 27 counties in Iowa; 20 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 5, 2019, 1:35 PM CDT (18:35 UTC)
- Expired
- May 5, 2019, 4:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 47 counties
Adair County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass 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, Harrison County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Polk County, IA, Pottawattamie County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Webster County, IA, Wright County, IA, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 25 km from the middle of the area, began a volume at 18:38 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, 6.6 hours before the alert went out and 25 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
- 85 J/kg
- Mixed-layer CIN
- -220 J/kg
- Mixed-layer LCL
- 1223 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 128 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 |
|---|---|---|---|---|
| May 5, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Pottawattamie, Shelby | 6 hr |
| May 5, 6:33 PM CDT | Mesoscale Discussion | SPC | Fremont | 87 min |
| May 5, 5:01 PM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Butler, Cass, Clay, Douglas and 27 more | 89 min |
Nearby
Mesoscale Discussions in Iowa, 2019Mesoscale Discussions in Nebraska, 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.