Alert archive / Iowa / Mesoscale Discussions in 2013
Mesoscale Discussion 1237
The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2013, 9:44 PM CDT for Hancock County, Illinois; 46 counties in Iowa; 19 counties in Missouri. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2013, 9:44 PM CDT (02:44 UTC)
- Expired
- Jun 25, 2013, 11:15 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 66 counties
Appanoose 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, Clarke County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Wright County, IA, Hancock County, IL, Adair County, MO, Chariton County, MO, Clark County, MO, Grundy County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO
The radar
The Des Moines radar (KDMX), 124 km from the middle of the area, began a volume at 02:48 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, 2.7 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
- 2162 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1316 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.9
The text
As transmitted, in the capitals the NWS used until 2016.
609
ACUS11 KWNS 260245
SWOMCD
SPC MCD 260244
IAZ000-ILZ000-MOZ000-260415-
MESOSCALE DISCUSSION 1237
NWS STORM PREDICTION CENTER NORMAN OK
0944 PM CDT TUE JUN 25 2013
AREAS AFFECTED...CNTRL/ERN IA...NERN MO
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 260244Z - 260415Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...THUNDERSTORMS ARE FORECAST TO DEVELOP OVER CNTRL/ERN IA
AND NRN MO TONIGHT. STORMS WILL POSE A THREAT FOR LARGE HAIL AND
DAMAGING WINDS. AREA IS BEING MONITORED FOR A WW.
DISCUSSION...A 30-50 KT LOW-LEVEL JET VEERS NEWD FROM OK/KS INTO THE
MID MS VALLEY AREA TONIGHT. CONVERGENCE AND WAA LOCATED IN THE EXIT
REGION OF THE LLJ COMBINED WITH A VERY UNSTABLE AIRMASS WILL YIELD
AN ENVIRONMENT FAVORABLE FOR THUNDERSTORM DEVELOPMENT FROM CNTRL/ERN
IA INTO NRN MO...WITH COOLING CLOUD TOPS OVER CNTRL IA POSSIBLY
SIGNALING AN AREA OF INITIAL DEVELOPMENT. VEERING DEEP-LAYER WIND
PROFILES ASSOCIATED WITH THE WAA REGIME WILL SUPPORT STORM
ORGANIZATION...PERHAPS IN THE FORM OF A FEW SUPERCELLS
INITIALLY...WITH A TRANSITION TO UPSCALE GROWTH/MCS DEVELOPMENT
LATER IN THE NIGHT. LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE.
TRENDS WILL CONTINUE TO BE MONITORED FOR A WW.
..GARNER/CORFIDI.. 06/26/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LSX...DVN...ARX...DMX...EAX...
LAT...LON 39309147 39179330 40109395 42789376 43339321 43229179
42059066 39309147SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 9:20 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Coles, Crawford and 27 more | 85 min |
| Jun 25, 9:49 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Cass, Champaign, Christian, Clark, Clay and 47 more | 7 hr |
| Jun 26, 1:43 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 10 more | 92 min |
| Jun 26, 2:09 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 13 more | 5 hr |
| Jun 26, 3:32 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Fulton and 24 more | 88 min |
| Jun 26, 5:46 AM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clay, Clinton, Edwards and 30 more | 89 min |
| Jun 26, 11:11 AM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Lawrence, Richland, Wabash | 2 hr |
| Jun 26, 12:22 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 11 hr |
| Jun 26, 2:50 PM CDT | Mesoscale Discussion | SPC | Edwards, Gallatin, Hamilton, Hardin, Jefferson, Marion and 4 more | 115 min |
| Jun 26, 3:40 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Calhoun, Clinton, Greene, Jersey and 7 more | 95 min |
| Jun 26, 6:54 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more | 96 min |
| Jun 25, 8:23 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 34 more | 97 min |
| Jun 25, 10:41 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 38 more | 5 hr |
| Jun 26, 1:02 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 13 more | 118 min |
Nearby
Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Every mesoscale discussion in 2013
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.