Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 541
The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 11:28 PM CDT for 34 counties in Iowa; Putnam County, Missouri. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2012, 11:28 PM CDT (04:28 UTC)
- Expired
- Apr 15, 2012, 1:00 AM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 35 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Iowa County, IA, Jasper County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Putnam County, MO
The radar
The Des Moines radar (KDMX), 27 km from the middle of the area, began a volume at 04:28 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
Omaha, NE (KOAX), launched 00:00Z, 4.5 hours before the alert went out and 208 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
- 871 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 483 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
624
ACUS11 KWNS 150428
SWOMCD
SPC MCD 150428
IAZ000-MOZ000-150600-
MESOSCALE DISCUSSION 0541
NWS STORM PREDICTION CENTER NORMAN OK
1128 PM CDT SAT APR 14 2012
AREAS AFFECTED...CENTRAL IOWA
CONCERNING...TORNADO WATCH 169...
VALID 150428Z - 150600Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 169 CONTINUES.
HOWEVER...IN THE NEAR TERM IT APPEARS TO BE DECREASING...AND A NEW
WW IS NOT ANTICIPATED PRIOR TO THE 05Z EXPIRATION OF WW 169.
AS THE DEEP SURFACE CYCLONE CONTINUES TO MIGRATE OUT OF NORTHWEST
KANSAS INTO EAST CENTRAL NEBRASKA THROUGH 06-09Z...ITS MOIST AND
POTENTIALLY UNSTABLE WARM SECTOR MAY OVERSPREAD MUCH OF IOWA
OVERNIGHT. AND IT IS NOT CERTAIN THAT AN ADDITIONAL WW WILL NOT BE
NEEDED LATER TONIGHT...ASSOCIATED WITH A SQUALL LINE STILL IN THE
PROCESS OF EVOLVING OVER THE CENTRAL/SOUTH CENTRAL PLAINS...WITHIN A
STRONG AND SHEARED DEEP LAYER MEAN FLOW...WHICH CONTINUES TO DEVELOP
NORTHEASTWARD. HOWEVER...IT MAY STILL BE AT LEAST SEVERAL HOURS
AWAY BEFORE THIS BEGINS TO MATERIALIZE ACROSS CENTRAL IOWA.
..KERR.. 04/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DVN...DMX...EAX...FSD...OAX...
LAT...LON 42189571 42449388 42169245 41479178 40819216 40429315
40829471 41209544 42189571SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 7:50 PM CDT | Mesoscale Discussion | SPC | Benton, Buchanan, Cedar, Delaware, Henry, Iowa and 13 more | 55 min |
| Apr 14, 7:51 PM CDT | Mesoscale Discussion | SPC | Cherokee, Ida, Lyon, Monona, O'Brien, Osceola and 3 more | 84 min |
| Apr 14, 8:41 PM CDT | Severe Thunderstorm Watch | SPC | Cedar, Clinton, Des Moines, Henry, Iowa, Jackson and 9 more | 4 hr |
| Apr 14, 9:54 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Jackson, Jones, Louisa, Muscatine and 1 more | 96 min |
| Apr 14, 10:09 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 3 more | 6 hr |
| Apr 15, 3:25 AM CDT | Mesoscale Discussion | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 95 min |
| Apr 15, 1:56 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Butler, Calhoun, Carroll and 28 more | 94 min |
| Apr 15, 3:37 PM CDT | Tornado Watch | SPC | Cerro Gordo, Chickasaw, Clay, Dickinson, Emmet, Floyd and 8 more | 7 hr |
| Apr 14, 11:48 PM CDT | Mesoscale Discussion | SPC | Clay, Platte | 87 min |
| Apr 15, 1:37 AM CDT | Tornado Watch | SPC | Andrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 2 more | 5 hr |
| Apr 15, 4:32 AM CDT | Mesoscale Discussion | SPC | Bates, Buchanan, Caldwell, Cass, Clay, Clinton and 6 more | 88 min |
| Apr 15, 6:35 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Dade, Jasper, Lawrence, McDonald and 1 more | 85 min |
| Apr 15, 6:38 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Jasper, Lawrence, McDonald, Newton | 4 hr |
| Apr 15, 9:25 AM CDT | Mesoscale Discussion | SPC | Barry, Christian, Douglas, Greene, Howell, Laclede and 7 more | 95 min |
| Apr 15, 10:51 AM CDT | Tornado Watch | SPC | Barry, Camden, Christian, Crawford, Dallas, Dent and 19 more | 7 hr |
| Apr 15, 1:38 PM CDT | Mesoscale Discussion | SPC | Christian, Crawford, Dent, Douglas, Howell, Laclede and 9 more | 97 min |
| Apr 15, 4:22 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 23 more | 83 min |
| Apr 15, 4:42 PM CDT | Tornado Watch | SPC | Audrain, Boone, Butler, Callaway, Carter, Cole and 35 more | 6 hr |
Nearby
Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Missouri, 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.