Alert archive / Nebraska / Mesoscale Discussions in 2007
Mesoscale Discussion 306
The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2007, 4:57 PM CDT for 9 counties in Iowa; Republic County, Washington County, Kansas; 16 counties in Nebraska. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Mar 21, 2007, 4:57 PM CDT (21:57 UTC)
- Expired
- Mar 21, 2007, 6:00 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 27 counties
Crawford County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Republic County, KS, Washington County, KS, Burt County, NE, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 53 km from the middle of the area, began a volume at 21:58 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, 10.0 hours before the alert went out and 53 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
- 316 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 503 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.2
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 21, 6:37 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Butler and 36 more | 113 min |
| Mar 21, 9:44 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Clarke, Dallas, Davis and 24 more | 2 hr |
| Mar 21, 10:24 AM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 31 more | 5 hr |
| Mar 21, 12:30 PM CDT | Mesoscale Discussion | SPC | Clinton, Scott | 90 min |
| Mar 21, 12:58 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Lee, Van Buren | 62 min |
| Mar 21, 1:26 PM CDT | Mesoscale Discussion | SPC | Clinton, Jackson, Scott | 64 min |
| Mar 21, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 34 more | 7 hr |
Nearby
Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Kansas, 2007Every mesoscale discussion in 2007
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.