Alert archive / Iowa / Mesoscale Discussions in 2009
Mesoscale Discussion 1508
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2009, 1:36 AM CDT for 4 states. It was in force for 24 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2009, 1:36 AM CDT (06:36 UTC)
- Expired
- Jul 10, 2009, 2:00 AM CDT
- In force
- 24 min
- Issued by
- the Storm Prediction Center
All 40 counties
Allamakee County, IA, 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, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hancock County, IA, Howard County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Kossuth County, IA, Linn County, IA, Mitchell County, IA, Muscatine County, IA, Palo Alto County, IA, Scott County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Jo Daviess County, IL, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Martin County, MN, Mower County, MN, Crawford County, WI, Grant County, WI
The radar
The La Crosse radar (KARX), 135 km from the middle of the area, began a volume at 06:36 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, 6.6 hours before the alert went out and 220 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
- 11 J/kg
- Mixed-layer CIN
- -339 J/kg
- Mixed-layer LCL
- 982 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Jul 9, 7:02 PM CDT | Severe Thunderstorm Watch | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 21 more | 7 hr |
| Jul 9, 11:31 PM CDT | Mesoscale Discussion | SPC | Allamakee, Audubon, Buena Vista, Calhoun, Carroll, Cerro Gordo and 33 more | 89 min |
| Jul 9, 9:07 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Brown, Faribault, Freeborn, Le Sueur, Martin and 6 more | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2009Mesoscale Discussions in Minnesota, 2009Mesoscale Discussions in Wisconsin, 2009Every mesoscale discussion in 2009
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.