Alert archive / Iowa / Mesoscale Discussions in 2013
Mesoscale Discussion 710
The Storm Prediction Center issued this mesoscale discussion at May 19, 2013, 7:13 PM CDT for 6 counties in Illinois; 55 counties in Iowa; Clark County, Missouri. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2013, 7:13 PM CDT (00:13 UTC)
- Expired
- May 19, 2013, 8:15 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 62 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Henry County, IA, Iowa County, IA, Jackson 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, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, Muscatine County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Hancock County, IL, Henderson County, IL, Henry County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO
The radar
The Des Moines radar (KDMX), 79 km from the middle of the area, began a volume at 00:16 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 00:00Z, 0.2 hours before the alert went out and 278 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
- 588 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1386 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.4
The text
As transmitted, in the capitals the NWS used until 2016.
833
ACUS11 KWNS 200014
SWOMCD
SPC MCD 200013
ILZ000-IAZ000-MOZ000-200115-
MESOSCALE DISCUSSION 0710
NWS STORM PREDICTION CENTER NORMAN OK
0713 PM CDT SUN MAY 19 2013
AREAS AFFECTED...CNTRL AND SRN IA
CONCERNING...TORNADO WATCH 183...
VALID 200013Z - 200115Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 183 CONTINUES.
SUMMARY...THE SEVERE WEATHER THREAT CONTINUES ACROSS THE WATCH AREA
WITH THE GREATEST NEAR-TERM RISK FOR TORNADOES...DAMAGING
WINDS...AND HAIL OVER CNTRL IA.
DISCUSSION...A NOTABLE INCREASE IN TSTMS HAS BEEN OBSERVED OVER THE
PAST HOUR BETWEEN OMA AND DSM...LIKELY IN RESPONSE TO THE INFLUENCE
OF A VORTICITY MAXIMUM RAPIDLY MOVING NEWD THROUGH NWRN IA. AS OF
2355Z...THE MOST INTENSE STORM /A SUPERCELL/ WAS LOCATED OVER DALLAS
COUNTY IA WHICH HAS RECENTLY PRODUCED A TORNADO. GIVEN A
MOIST...MODERATELY UNSTABLE AIR MASS WHICH COINCIDES WITH A
KINEMATIC ENVIRONMENT FEATURING LARGELY UNIDIRECTIONAL SLY WINDS
THROUGH THE LOWEST 4 KM AGL BEFORE VEERING SLIGHTLY TO SSWLY AND
INCREASING TO 50-60 KT IN THE UPPER TROPOSPHERE...THE THREAT FOR
EMBEDDED SUPERCELL STRUCTURES WILL PERSIST OVER CNTRL IA THIS
EVENING. WHILE DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY
HAZARDS...ISOLATED TORNADOES WILL BE POSSIBLE WITH THE MOST
INTENSE/PERSISTENT SUPERCELLS.
OVER ERN IA...A CLUSTER OF STRONG TO SEVERE STORMS CONTINUES ALONG
THE MS RIVER NEAR MLI. WHILE VERTICAL SHEAR IS COMPARATIVELY WEAKER
THAN POINTS TO THE WEST...THE 00Z DVN SOUNDING SUGGESTS THAT
SUFFICIENT INSTABILITY EXISTS TO SUPPORT AT LEAST AN ISOLATED SEVERE
WEATHER THREAT FOR THE NEXT COUPLE OF HOURS.
..MEAD.. 05/20/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILX...DVN...DMX...EAX...FSD...OAX...
LAT...LON 42229623 42339029 41549002 40599050 40319093 40439204
40729316 40629534 41289577 42229623SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:46 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Henry, Jo Daviess, Knox and 11 more | 59 min |
| May 19, 8:10 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, DeKalb, Fulton, Hancock and 25 more | 6 hr |
| May 19, 10:16 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Pike | 59 min |
| May 19, 10:58 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Fulton, Hancock and 22 more | 62 min |
| May 20, 3:27 PM CDT | Mesoscale Discussion | SPC | Brown, Calhoun, Cass, Champaign, Christian, DeWitt and 21 more | 63 min |
| May 20, 5:07 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 9 more | 23 min |
| May 20, 5:24 PM CDT | Tornado Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 31 more | 7 hr |
| May 20, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer, Warren | 5 hr |
| May 19, 8:21 PM CDT | Mesoscale Discussion | SPC | Butler, Cerro Gordo, Emmet, Franklin, Grundy, Hamilton and 9 more | 54 min |
| May 19, 9:11 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Jasper, Lucas, Mahaska and 7 more | 64 min |
| May 20, 5:38 PM CDT | Mesoscale Discussion | SPC | Boone, Butler, Clarke, Dallas, Decatur, Franklin and 14 more | 67 min |
| May 19, 7:55 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 4 more | 65 min |
| May 19, 11:49 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 17 more | 56 min |
| May 20, 8:46 AM CDT | Mesoscale Discussion | SPC | Bates, Benton, Cass, Henry, Jackson, Johnson and 4 more | 59 min |
| May 20, 12:26 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 20 more | 2 hr |
| May 20, 12:46 PM CDT | Tornado Watch | SPC | Barry, Barton, Bates, Benton, Boone, Callaway and 41 more | 8 hr |
| May 20, 6:53 PM CDT | Mesoscale Discussion | SPC | Carter, Dent, Douglas, Howell, Iron, Madison and 8 more | 67 min |
Nearby
Mesoscale Discussions in Iowa, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Missouri, 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.