Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 893
The Storm Prediction Center issued this mesoscale discussion at May 24, 2012, 5:42 PM CDT for 30 counties in Iowa; 6 counties in Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 24, 2012, 5:42 PM CDT (22:42 UTC)
- Expired
- May 24, 2012, 7:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 36 counties
Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Crawford County, WI, Grant County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Sauk County, WI
The radar
The Quad Cities radar (KDVN), 114 km from the middle of the area, began a volume at 22:42 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, 10.7 hours before the alert went out and 120 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
- 1568 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
509 ACUS11 KWNS 242242 SWOMCD SPC MCD 242242 WIZ000-ILZ000-IAZ000-250045- MESOSCALE DISCUSSION 0893 NWS STORM PREDICTION CENTER NORMAN OK 0542 PM CDT THU MAY 24 2012 AREAS AFFECTED...ERN IA/SWRN WI/FAR NWRN IL CONCERNING...SEVERE THUNDERSTORM WATCH 296... VALID 242242Z - 250045Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 296 CONTINUES. SUMMARY...BAND OF STRONG/ISOLATED SEVERE STORMS WILL CONTINUE MOVING EWD -- WITH ASSOCIATED SEVERE HAIL/WIND POTENTIAL. DISCUSSION...A BROKEN BAND OF STORMS CONTINUES CROSSING ERN IA AND ADJACENT AREAS ATTM...AHEAD OF AN ADVANCING COLD FRONT. STORMS ARE MOVING THROUGH THE AXIS OF GREATEST INSTABILITY ATTM...WITH A MUCH MORE STABLE/CAPPED AIRMASS INDICATED E OF THE MS RIVER. WHILE THIS -- COMBINED WITH THE ONSET OF DIURNAL COOLING LATER THIS EVENING -- SHOULD RESULT IN AN EVENTUAL DECREASE IN STORM INTENSITY...THREAT FOR LARGE HAIL AND LOCALLY DAMAGING GUSTS WILL CONTINUE FOR AT LEAST A FEW MORE HOURS...WITHIN STRONGLY SHEARED/AMPLY UNSTABLE ENVIRONMENT. ..GOSS.. 05/24/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MKX...DVN...ARX...DMX... LAT...LON 40609334 42669231 43499142 43478964 40629131 40609334
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 8:56 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 23 more | 94 min |
| May 24, 6:33 AM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Chickasaw, Clayton and 8 more | 57 min |
| May 24, 1:34 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 10 more | 116 min |
| May 24, 3:06 PM CDT | Mesoscale Discussion | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 38 more | 114 min |
| May 24, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 39 more | 4 hr |
| May 24, 2:22 PM CDT | Tornado Watch | SPC | Adams, Ashland, Barron, Bayfield, Buffalo, Chippewa and 27 more | 5 hr |
| May 24, 5:41 PM CDT | Mesoscale Discussion | SPC | Adams, Clark, Eau Claire, Florence, Forest, Iron and 15 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Wisconsin, 2012Every mesoscale discussion in 2012
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.