Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 945

May 24, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 11:24 PM CDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
May 24, 2011, 11:24 PM CDT (04:24 UTC)
Expired
May 25, 2011, 1:00 AM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 60 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Conway County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Miller County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Yell County, AR, Benton County, MO, Camden County, MO, Christian County, MO, Cooper County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howard County, MO, Laclede County, MO, Miller County, MO, Moniteau County, MO, Morgan County, MO, Ozark County, MO, Pettis County, MO, Polk County, MO, Saline County, MO, Stone County, MO, Taney County, MO, Webster County, MO, Wright County, MO, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Hopkins County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Springfield radar (KSGF), 117 km from the middle of the area, began a volume at 04:26 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, 4.4 hours before the alert went out and 79 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 2011-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1213 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 2011-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
1213 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.2

Open this sounding in Storm Lab

The text

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

377 
ACUS11 KWNS 250424
SWOMCD
SPC MCD 250424 
MOZ000-ARZ000-LAZ000-TXZ000-OKZ000-250600-

MESOSCALE DISCUSSION 0945
NWS STORM PREDICTION CENTER NORMAN OK
1124 PM CDT TUE MAY 24 2011

AREAS AFFECTED...WRN AND CNTRL MO...EXTREME ERN OK AND WRN AR AND
NERN TX

CONCERNING...TORNADO WATCH 363...364...

VALID 250424Z - 250600Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 363...364...CONTINUES.

THREAT FOR ISOLATED TORNADOES...DAMAGING WIND AND LARGE HAIL WILL
LIKELY PERSIST NEXT FEW HOURS AS STORMS MOVE THROUGH WRN AND CNTRL
MO...EXTREME ERN OK INTO WRN AR AND NERN TX.

AN EXTENSIVE BAND OF STORMS WITH EMBEDDED SUPERCELLS IS ADVANCING
EWD THROUGH WRN MO...EXTREME ERN OK...WRN AR AND NERN TX. A STRONG
SLY LLJ WILL CONTINUE TO SHIFT EWD THROUGH THE LOWER-MID MS VALLEY
IN ASSOCIATION WITH POTENT CNTRL/SRN PLAINS SHORTWAVE TROUGH. THIS
WILL MAINTAIN 0-1 KM HODOGRAPHS FAVORABLE FOR TORNADOES AS ACTIVITY
CONTINUES EWD INTO A MODERATELY UNSTABLE ENVIRONMENT WHERE MUCAPE
REMAINS AROUND 2000 J/KG.

SEVERE THREAT WITH STORMS DEVELOPING BEHIND THE LINE ACROSS ERN KS
WILL PROBABLY REMAIN SOMEWHAT MARGINAL DUE TO MORE LIMITED
INSTABILITY.

..DIAL.. 05/25/2011

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

ATTN...WFO...LSX...LZK...SGF...SHV...EAX...TSA...FWD...

LAT...LON   37619354 39219352 39439284 38529236 36549216 34039307
            32699422 32669585 33789525 36139386 37619354

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 24, 7:42 PM CDTMesoscale DiscussionSPCBenton, Crawford, Little River, Polk, Scott, Sebastian and 2 more63 min
May 24, 8:05 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Conway and 30 more7 hr
May 25, 12:48 AM CDTMesoscale DiscussionSPCClay, Craighead, Fulton, Greene, Independence, Jackson and 4 more57 min
May 25, 7:31 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more59 min
May 25, 9:54 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 33 more96 min
May 25, 10:18 AM CDTMesoscale DiscussionSPCFulton, Independence, Izard, Jackson, St. Francis, Sharp and 2 more57 min
May 25, 10:37 AM CDTTornado WatchSPCBaxter, Boone, Carroll, Fulton, Izard, Madison and 5 more7 hr
May 25, 11:02 AM CDTMesoscale DiscussionSPCClay28 min
May 25, 11:52 AM CDTMesoscale DiscussionSPCArkansas, Clark, Clay, Cleburne, Cleveland, Conway and 38 more83 min
May 25, 12:28 PM CDTTornado Watch PDSSPCArkansas, Baxter, Bradley, Calhoun, Clark, Clay and 41 more8 hr
May 25, 1:53 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Columbia, Dallas, Hempstead and 9 more2 hr
May 25, 2:56 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Clark, Clay, Cleburne, Cleveland and 33 more94 min
May 25, 3:10 PM CDTMesoscale DiscussionSPCClay95 min
May 25, 3:16 PM CDTTornado WatchSPCAshley, Chicot, Columbia, Lafayette, Miller, Nevada and 1 more7 hr
May 25, 5:56 PM CDTMesoscale DiscussionSPCArkansas, Craighead, Crittenden, Cross, Greene, Lee and 5 more64 min
May 24, 7:07 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Cass, Cedar and 14 more53 min
May 24, 7:26 PM CDTTornado WatchSPCAdair, Barry, Barton, Bates, Benton, Buchanan and 48 more7 hr
May 25, 1:22 AM CDTTornado WatchSPCAudrain, Boone, Callaway, Camden, Christian, Clark and 43 more7 hr
May 25, 4:58 AM CDTMesoscale DiscussionSPCCrawford, Dent, Franklin, Iron, Jefferson, Reynolds and 7 more92 min
May 25, 5:46 AM CDTTornado WatchSPCPerry7 hr
May 25, 11:09 AM CDTTornado Watch PDSSPCBollinger, Butler, Cape Girardeau, Carter, Franklin, Iron and 19 more10 hr
May 25, 1:28 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Caldwell, Callaway, Camden and 44 more92 min
May 25, 2:31 PM CDTTornado WatchSPCClark, Scotland7 hr
May 25, 2:32 PM CDTMesoscale DiscussionSPCAudrain, Lincoln, Marion, Monroe, Montgomery, Pike and 2 more58 min
May 25, 6:25 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Mississippi, Perry, Scott and 2 more2 hr
May 24, 11:00 PM CDTMesoscale DiscussionSPCAnderson, Bell, Burnet, Coryell, Falls, Freestone and 6 more60 min
May 24, 11:22 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Coryell, Falls, Freestone, Henderson and 7 more5 hr
May 25, 3:10 AM CDTMesoscale DiscussionSPCBastrop, Bell, Blanco, Brazos, Burleson, Burnet and 8 more95 min
May 25, 5:15 PM CDTMesoscale DiscussionSPCAnderson, Austin, Bastrop, Brazos, Burleson, Caldwell and 23 more60 min

Nearby

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Texas, 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.