Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 498
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2017, 5:06 PM CDT for 6 counties in Illinois; 16 counties in Iowa; Grant County, Green County, Lafayette County, Wisconsin. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2017, 5:06 PM CDT (22:06 UTC)
- Expired
- Apr 15, 2017, 6:30 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 25 counties
Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Carroll County, IL, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Grant County, WI, Green County, WI, Lafayette County, WI
The radar
The Quad Cities radar (KDVN), 42 km from the middle of the area, began a volume at 22:08 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 12:00Z, 10.1 hours before the alert went out and 48 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1567 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 9 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 |
|---|---|---|---|---|
| Apr 15, 4:01 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 46 more | 119 min |
| Apr 15, 5:05 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Calhoun, Carroll and 35 more | 7 hr |
| Apr 15, 6:22 PM CDT | Mesoscale Discussion | SPC | Cherokee, Monona, Plymouth, Woodbury | 83 min |
Nearby
Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Wisconsin, 2017Every mesoscale discussion in 2017
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.