Alert archive / Missouri / Mesoscale Discussions in 2013

Mesoscale Discussion 515

April 18, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2013, 4:02 AM CDT for 4 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 18, 2013, 4:02 AM CDT (09:02 UTC)
Expired
Apr 18, 2013, 5:00 AM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 64 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Calhoun County, IL, Greene County, IL, Jersey County, IL, Monroe County, IL, Christian County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Montgomery County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Springfield radar (KSGF), 74 km from the middle of the area, began a volume at 09:01 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, 9.0 hours before the alert went out and 85 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 2013-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1964 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 2013-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
1964 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1350 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.2

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 17, 10:47 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Madison, Washington7 hr
Apr 18, 2:01 AM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Madison and 2 more89 min
Apr 18, 7:26 AM CDTMesoscale DiscussionSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more2 hr
Apr 18, 9:25 AM CDTTornado WatchSPCArkansas, Baxter, Bradley, Calhoun, Clark, Clay and 43 more8 hr
Apr 18, 12:48 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 29 more87 min
Apr 18, 1:43 PM CDTTornado WatchSPCAshley, Chicot, Union8 hr
Apr 17, 8:21 PM CDTMesoscale DiscussionSPCCass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more84 min
Apr 17, 8:53 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Pike, Scott97 min
Apr 17, 9:57 PM CDTTornado WatchSPCAdams, Brown, Pike7 hr
Apr 17, 10:48 PM CDTMesoscale DiscussionSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 12 more57 min
Apr 17, 11:46 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott89 min
Apr 18, 5:36 AM CDTMesoscale DiscussionSPCBond, Clinton, Fayette, Madison, Monroe, Montgomery and 3 more54 min
Apr 18, 5:42 AM CDTTornado WatchSPCBond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more8 hr
Apr 18, 7:25 AM CDTMesoscale DiscussionSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 17 more95 min
Apr 18, 8:31 AM CDTTornado Watch PDSSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 6 more7 hr
Apr 18, 11:14 AM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Jasper, Lawrence, Marion and 4 more2 hr
Apr 18, 2:47 PM CDTMesoscale DiscussionSPCClark, Crawford, Lawrence88 min
Apr 17, 8:36 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 41 more84 min
Apr 17, 10:37 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Comanche and 35 more53 min
Apr 18, 4:29 AM CDTMesoscale DiscussionSPCMarshall91 min

Nearby

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