Alert archive / Missouri / Mesoscale Discussions in 2014
Mesoscale Discussion 554
The Storm Prediction Center issued this mesoscale discussion at May 10, 2014, 7:55 PM CDT for 8 counties in Illinois; 28 counties in Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 10, 2014, 7:55 PM CDT (00:55 UTC)
- Expired
- May 10, 2014, 9:30 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 36 counties
Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Pike County, IL, Saint Clair County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Carroll County, MO, Chariton County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Jefferson County, MO, Lincoln County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 00:58 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 nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.9 hours before the alert went out and 292 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
- 691 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1852 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
021
ACUS11 KWNS 110056
SWOMCD
SPC MCD 110055
ILZ000-MOZ000-110230-
MESOSCALE DISCUSSION 0554
NWS STORM PREDICTION CENTER NORMAN OK
0755 PM CDT SAT MAY 10 2014
AREAS AFFECTED...CNTRL/NRN MO...WRN IL
CONCERNING...SEVERE THUNDERSTORM WATCH 138...
VALID 110055Z - 110230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 138
CONTINUES.
SUMMARY...LARGE HAIL AND DAMAGING WIND THREAT WILL CONTINUE ACROSS
WW 138. AN ISOLATED TORNADO THREAT WILL ALSO EXIST WITH PERSISTENT
DISCRETE SUPERCELLS THIS EVENING.
DISCUSSION...AS OF 0030Z...A SUPERCELL WHICH EVOLVED OUT OF A
CLUSTER OF SEVERE TSTMS CONTINUES ESEWD ACROSS THE NRN HALF OF WW
138...WHILE A DISCRETE SUPERCELL CONTINUES ACROSS SALINE/CARROLL
COUNTIES IN MISSOURI. THIS ACTIVITY IS OCCURRING ALONG AND JUST
NORTH OF A WEAK SFC BOUNDARY DRAPED NORTH OF A STL-COU-DMO LINE IN
AN ENVIRONMENT CHARACTERIZED BY MODERATE INSTABILITY AND STRONG
DEEP-LAYER SHEAR. ASCENT TO THE NORTH OF THE BOUNDARY AIDED BY A
MODEST LOW-LEVEL JET WILL LIKELY SUSTAIN THIS ACTIVITY THROUGH MUCH
OF THE EVENING...WITH FAVORABLY VEERING WIND PROFILES CONTINUING TO
SUPPORT DISCRETE SUPERCELLS AND ORGANIZED LINE SEGMENTS.
WHILE A RELATIVELY DRY BOUNDARY LAYER CONTINUES TO LIMIT THE OVERALL
TORNADO THREAT...THE PRESENCE OF DISCRETE SUPERCELL STRUCTURES IN
THE VICINITY OF ENHANCED LOW-LEVEL SHEAR ALONG AND NORTH OF THE
BOUNDARY WILL RESULT IN A THREAT OF AN ISOLATED TORNADO OR TWO.
GIVEN THE ISOLATED NATURE OF THE TORNADO THREAT...A TORNADO WATCH
DOES NOT APPEAR TO BE WARRANTED AT THIS TIME. OTHERWISE...LARGE HAIL
WILL CONTINUE TO BE A SIGNIFICANT THREAT...AND AN ENHANCED WIND
THREAT WILL BE PRESENT WITH ANY BOWING LINE SEGMENTS THAT MAY
EVOLVE.
..DEAN.. 05/11/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILX...LSX...SGF...EAX...
LAT...LON 38579301 38859340 39099344 39259349 39479351 39749345
39959328 40019302 40059260 40039212 39839130 39569056
39298969 38938953 38558960 38268999 38219038 38139087
38209135 38249172 38319210 38579301SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 10:22 PM CDT | Mesoscale Discussion | SPC | Calhoun, Jersey, Madison, Monroe, Randolph, Saint Clair | 83 min |
| May 11, 9:16 AM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 89 min |
| May 11, 10:47 AM CDT | Mesoscale Discussion | SPC | Hancock | 118 min |
| May 11, 11:53 AM CDT | Tornado Watch | SPC | Carroll, Henderson, Henry, Mercer, Rock Island, Warren and 1 more | 7 hr |
| May 11, 12:51 PM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Jo Daviess, Mercer, Rock Island, Whiteside | 54 min |
| May 11, 2:36 PM CDT | Mesoscale Discussion | SPC | Mercer | 84 min |
| May 11, 3:05 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more | 7 hr |
| May 11, 5:09 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more | 66 min |
| May 11, 5:49 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Edgar | 56 min |
| May 10, 7:59 PM CDT | Mesoscale Discussion | SPC | Andrew, Bates, Buchanan, Caldwell, Carroll, Cass and 19 more | 91 min |
| May 11, 1:19 AM CDT | Mesoscale Discussion | SPC | Atchison, Nodaway | 2 hr |
| May 11, 7:02 AM CDT | Mesoscale Discussion | SPC | Atchison, Holt | 118 min |
| May 11, 12:49 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, DeKalb, Gentry, Holt and 2 more | 116 min |
| May 11, 2:21 PM CDT | Tornado Watch | SPC | Atchison | 8 hr |
Nearby
Mesoscale Discussions in Missouri, 2014Mesoscale Discussions in Illinois, 2014Every mesoscale discussion in 2014
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.