Alert archive / Missouri / Mesoscale Discussions in 2011

Mesoscale Discussion 337

April 4, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 1:29 AM CDT for 5 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 1:29 AM CDT (06:29 UTC)
Expired
Apr 4, 2011, 3:00 AM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 98 counties

Benton County, AR, Carroll County, AR, Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, DeWitt County, IL, Fulton County, IL, Greene County, IL, Jersey County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL, Cherokee County, KS, Audrain County, MO, Barry County, MO, Barton County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Lincoln County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Moniteau County, MO, Montgomery County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO, Craig County, OK, Delaware County, OK, Mayes County, OK, Ottawa County, OK

The radar

The Springfield radar (KSGF), 131 km from the middle of the area, began a volume at 06:32 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

Springfield, MO (KSGF), launched 00:00Z, 6.5 hours before the alert went out and 183 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.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 342 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
342 J/kg
Mixed-layer CIN
-476 J/kg
Mixed-layer LCL
2436 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
457 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

980 
ACUS11 KWNS 040630
SWOMCD
SPC MCD 040629
ILZ000-MOZ000-ARZ000-OKZ000-KSZ000-040800-

MESOSCALE DISCUSSION 0337
NWS STORM PREDICTION CENTER NORMAN OK
0129 AM CDT MON APR 04 2011

AREAS AFFECTED...PORTIONS WRN/NRN IL...EXTREME SERN KS...EXTREME
NWRN AR...CENTRAL/ERN/SRN MO...NERN OK.

CONCERNING...SEVERE THUNDERSTORM WATCH 84...85...

VALID 040629Z - 040800Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
84...85...CONTINUES.

BKN BAND OF MAINLY POST COLD-FRONTAL TSTMS...MANY OF WHICH ARE
PRODUCING WELL-DEFINED GUST FRONTS SUPERIMPOSED UPON POSTFRONTAL AIR
MASS...IS FCST TO CONTINUE MOVING EWD ACROSS REMAINDER WW AREAS THEN
OVER SWATH FROM CENTRAL/SRN IL SWWD ACROSS NRN/WRN OZARKS.  OVERALL
REFLECTIVITY TRENDS APPEAR TO BE DIMINISHING AS ACTIVITY ENCOUNTERS
PROGRESSIVELY STRONGER CINH...HOWEVER STG/ISOLATED SVR GUSTS REMAIN
POSSIBLE.  WITH ORGANIZATION OF SVR THREAT DIMINISHING FOR TIME
BEING...CURRENT PREFERENCE IS TO LET REMAINDER OF WWS 84-85 EXPIRE
AT 07Z AS SCHEDULED.

SFC ANALYSIS SHOWS COLD FRONT CONTINUING TO MOVE SEWD ACROSS THIS
REGION APPROXIMATELY 30 KT...NEAR PIA-AIZ-JLN LINE AS OF 06Z.  THIS
GENERAL MOTION SHOULD CONTINUE WITH SMALL-SCALE
REINFORCEMENTS/INFLECTIONS WHERE GUST FRONTS CATCH UP TO SYNOPTIC
BOUNDARY.  COMBINATION OF 06Z OBSERVED ILX RAOB...MODIFIED 00Z RAOBS
AND RUC SOUNDINGS FARTHER SW INDICATED PROGRESSIVELY STRONGER CINH
FOR BOTH SFC-BASED AND ELEVATED PARCELS.  VERTICALLY TRUNCATED --
AND THEREFORE INDEFINITE IN MAGNITUDE -- CAPE PROFILE AT ILX WAS
ROOTED IN ELEVATED INFLOW LAYER AROUND 800 MB.  RELATIVELY DRY
SUBCLOUD LAYER WILL STABILIZE DIABATICALLY VERY NEAR SFC...BUT
ALSO...WILL SUPPORT DOWNDRAFT ACCELERATION AND POTENTIAL FOR SOME
STRONG TO MARGINALLY SVR DOWNDRAFTS TO REACH SFC.  SIMILAR
PREFRONTAL DRYING BETWEEN SKIN LAYER AND CLOUD BASE IS EVIDENT SWWD
INTO WRN OZARKS.  MEANWHILE MLCINH WILL CONTINUE TO INCREASE THROUGH
REMAINDER OVERNIGHT HOURS...MORE SLOWLY NEAR SFC MOIST AXIS.  SFC
MOIST AXES WERE DRAWN NEAR ORD-SPI-CGI-MLU LINE...AND ALSO...NEAR
PRX-TUL-SGF LINE IMMEDIATELY PRIOR TO FROPA.  ADDITIONAL DEVELOPMENT
IS POSSIBLE INVOF FRONT...PARTICULARLY WHERE IT IMPINGES UPON EITHER
MOIST AXIS...AND AREAS SE OF EXPIRING WATCHES WILL BE MONITORED FOR
FAVORABLE CONVECTIVE/DESTABILIZATION TRENDS THROUGH REMAINDER
PRE-DAWN HOURS.

..EDWARDS.. 04/04/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LOT...ILX...LSX...DVN...LZK...SGF...EAX...TSA...
ICT...

LAT...LON   36549550 37919419 39789159 41218995 41098822 39758847
            38118981 37039139 36409316 36019476 36199530 36549550

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 9:51 PM CDTMesoscale DiscussionSPCBenton, Crawford, Madison, Washington84 min
Apr 4, 3:00 AM CDTMesoscale DiscussionSPCClark, Conway, Dallas, Faulkner, Garland, Grant and 20 more3 hr
Apr 4, 3:44 AM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 37 more7 hr
Apr 4, 5:48 AM CDTMesoscale DiscussionSPCBaxter, Clark, Clay, Cleburne, Conway, Craighead and 41 more117 min
Apr 4, 7:22 AM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 42 more7 hr
Apr 4, 7:44 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more8 hr
Apr 4, 10:25 AM CDTMesoscale DiscussionSPCAshley, Chicot2 hr
Apr 4, 10:53 AM CDTTornado WatchSPCAshley, Chicot7 hr
Apr 3, 7:44 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Fulton, Hancock, Henderson and 16 more61 min
Apr 3, 8:11 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 12 more6 hr
Apr 3, 8:54 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more5 hr
Apr 3, 10:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more67 min
Apr 3, 10:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, McDonough and 4 more85 min
Apr 4, 1:53 AM CDTMesoscale DiscussionSPCCook, DuPage, Grundy, Kane, Kendall, Lake and 2 more97 min
Apr 4, 4:20 AM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Effingham, Jasper, Lawrence and 2 more25 min
Apr 4, 6:53 AM CDTMesoscale DiscussionSPCHardin, Lawrence, Wabash2 hr
Apr 3, 7:26 PM CDTMesoscale DiscussionSPCAtchison, Brown, Chase, Dickinson, Doniphan, Douglas and 19 more64 min
Apr 3, 8:15 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Bourbon, Brown, Butler and 34 more60 min
Apr 3, 8:33 PM CDTSevere Thunderstorm WatchSPCAllen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 8 more5 hr
Apr 3, 11:02 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Labette, Neosho88 min

Nearby

Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.