Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 921

June 1, 20136 states

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2013, 1:51 AM CDT for 6 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jun 1, 2013, 1:51 AM CDT (06:51 UTC)
Expired
Jun 1, 2013, 3:45 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 55 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Marion County, AR, Washington County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Union County, KY, Barry County, MO, Bollinger County, MO, Cape Girardeau County, MO, Carter County, MO, Christian County, MO, Dade County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Jasper County, MO, Lawrence County, MO, Madison County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Perry County, MO, Reynolds County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Wayne County, MO, Webster County, MO, Wright County, MO, Ottawa County, OK

The radar

The St Louis radar (KLSX), 136 km from the middle of the area, began a volume at 06:50 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, 6.9 hours before the alert went out and 229 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 2013-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2316 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 2013-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 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
2316 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1144 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
3.0
Supercell composite
16.6

Open this sounding in Storm Lab

The text

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

522 
ACUS11 KWNS 010652
SWOMCD
SPC MCD 010651 
INZ000-KYZ000-ILZ000-MOZ000-ARZ000-OKZ000-KSZ000-010845-

MESOSCALE DISCUSSION 0921
NWS STORM PREDICTION CENTER NORMAN OK
0151 AM CDT SAT JUN 01 2013

AREAS AFFECTED...SRN IL VICINITY WSWWD ACROSS SRN MO/NWRN AR

CONCERNING...TORNADO WATCH 266...

VALID 010651Z - 010845Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 266 CONTINUES.

SUMMARY...SEVERE/ISOLATED TORNADO THREAT CONTINUES ACROSS VALID
PORTIONS OF THE WW AREA.

DISCUSSION...A LINE OF STRONG/LOCALLY SEVERE THUNDERSTORMS EXTENDS
SWWD OUT OF INDIANA ACROSS SRN IL AND INTO SERN MO -- MOVING ESEWD
AT ROUGHLY 30 KT.  FARTHER W -- OVER THE SWRN MO VICINITY...A
CLUSTER OF MORE ISOLATED/LOCALLY SEVERE CELLS IS ONGOING.  

THESE CELLS ARE ONGOING WITHIN A MODERATELY UNSTABLE
ENVIRONMENT...OVERLAYED BY MID-LEVEL WLY FLOW AT AROUND 35 KT -- AND
THUS EXPECT SEVERE THREAT TO CONTINUE.  AN ISOLATED TORNADO OR TWO
WILL ALSO BE POSSIBLE -- PARTICULARLY OVER SWRN PORTIONS OF THE WW.

THE BAND OF STORMS CROSSING SRN IL/SERN MO WILL BEGIN TO APPROACH
THE EDGE OF THE WATCH IN THE NEXT HOUR.  WE WILL MONITOR EVOLUTION
OF THIS PORTION OF THE LINE FOR POSSIBLE NEW WW.  HOWEVER...WITH
DOWNSTREAM AIRMASS INTO WRN KY/NWRN TN LESS UNSTABLE AND SOMEWHAT
ANAFRONTAL CHARACTER OF THE CONVECTION...STORM INTENSITY MAY
DIMINISH WITH TIME.

..GOSS.. 06/01/2013

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

ATTN...WFO...IND...PAH...ILX...LSX...LZK...SGF...TSA...

LAT...LON   38938769 37588756 35779449 37089489 37509446 37509336
            37349221 37818993 38938769

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 31, 11:08 PM CDTMesoscale DiscussionSPCCrawford, Sebastian67 min
May 31, 11:23 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more5 hr
Jun 1, 2:19 AM CDTMesoscale DiscussionSPCBoone, Crawford, Franklin, Johnson, Logan, Madison and 5 more116 min
Jun 1, 3:46 AM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Crawford and 24 more29 min
Jun 1, 9:53 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Craighead and 22 more2 hr
May 31, 7:05 PM CDTMesoscale DiscussionSPCBond, Calhoun, Christian, Greene, Jersey, Macon and 5 more85 min
May 31, 7:23 PM CDTTornado WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 12 more6 hr
May 31, 8:46 PM CDTMesoscale DiscussionSPCBond, Clay, Clinton, Coles, Cumberland, Effingham and 16 more59 min
May 31, 9:37 PM CDTTornado WatchSPCAlexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 19 more6 hr
May 31, 9:47 PM CDTMesoscale DiscussionSPCIroquois58 min
May 31, 10:11 PM CDTTornado WatchSPCFord, Iroquois5 hr
Jun 1, 1:13 AM CDTMesoscale DiscussionSPCCrawford, Lawrence, Wabash2 hr
Jun 1, 1:24 PM CDTMesoscale DiscussionSPCDearborn, Ohio, Switzerland96 min
Jun 1, 5:05 PM CDTMesoscale DiscussionSPCBath, Bell, Breathitt, Clark, Clay, Clinton and 20 more85 min
May 31, 8:02 PM CDTMesoscale DiscussionSPCCanadian, Carter, Cleveland, Craig, Creek, Garvin and 17 more58 min
May 31, 11:46 PM CDTSevere Thunderstorm WatchSPCBlaine, Caddo, Canadian, Cleveland, Grady, Hughes and 9 more5 hr
Jun 1, 2:30 AM CDTMesoscale DiscussionSPCBlaine, Canadian, Cleveland, Hughes, Kingfisher, Lincoln and 6 more2 hr

Nearby

Mesoscale Discussions in Missouri, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Arkansas, 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.