Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 251
The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2011, 8:00 PM CDT for 13 counties in Iowa; 9 counties in Missouri. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Mar 22, 2011, 8:00 PM CDT (01:00 UTC)
- Expired
- Mar 22, 2011, 9:00 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 22 counties
Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Mahaska County, IA, Monroe County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Adair County, MO, Clark County, MO, Grundy County, MO, Knox County, MO, Linn County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO
The radar
The Quad Cities radar (KDVN), 166 km from the middle of the area, began a volume at 01:01 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
Davenport, (KDVN), launched 00:00Z, 1.0 hours before the alert went out and 171 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
- 8 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 418 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- 787 m²/s²
- 0-3 km storm-relative helicity
- 972 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 8:35 PM CDT | Tornado Watch | SPC | Appanoose, Davis, Henry, Jefferson, Keokuk, Lucas and 7 more | 5 hr |
| Mar 22, 11:21 PM CDT | Mesoscale Discussion | SPC | Des Moines, Lee | 84 min |
Nearby
Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Missouri, 2011Every mesoscale discussion in 2011
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.