Alert archive / Missouri / Mesoscale Discussions in 2012

Mesoscale Discussion 175

February 28, 2012Benton County, Arkansas; 19 counties in Missouri; 7 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2012, 11:40 PM CST for Benton County, Arkansas; 19 counties in Missouri; 7 counties in Oklahoma. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Feb 28, 2012, 11:40 PM CST (05:40 UTC)
Expired
Feb 29, 2012, 1:15 AM CST
In force
95 min
Issued by
the Storm Prediction Center
All 27 counties

Benton County, AR, Barry County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Hickory County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Miller County, MO, Newton County, MO, Polk County, MO, Pulaski County, MO, St. Clair County, MO, Stone County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Ottawa County, OK, Wagoner County, OK

The radar

The Springfield radar (KSGF), 67 km from the middle of the area, began a volume at 05:43 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, 5.7 hours before the alert went out and 25 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 2012-02-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 75 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 2012-02-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 482 square meters per square second.1939587897117136Sfc1 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
75 J/kg
Mixed-layer CIN
-196 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
482 m²/s²
0-3 km storm-relative helicity
563 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

Open this sounding in Storm Lab

The text

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

756 
ACUS11 KWNS 290540
SWOMCD
SPC MCD 290540 
MOZ000-ARZ000-OKZ000-KSZ000-290715-

MESOSCALE DISCUSSION 0175
NWS STORM PREDICTION CENTER NORMAN OK
1140 PM CST TUE FEB 28 2012

AREAS AFFECTED...CNTRL/SWRN MO...NERN OK...FAR NWRN AR

CONCERNING...TORNADO WATCH 41...43...

VALID 290540Z - 290715Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 41...43...CONTINUES.

QLCS EXTENDING ALONG AND JUST AHEAD OF COLD FRONT STRETCHED FROM WRN
MO SWWD INTO NERN OK. PRIMARY DAMAGING WIND/TORNADO THREAT EXISTS
WITH COMPLEX BOWING SEGMENT/EMBEDDED SUPERCELL STRUCTURES ACROSS
DADE/CEDAR COUNTIES AS OF 0530Z. THIS FEATURE HAS BEEN PROPAGATING
AT AROUND 60 KT OVER THE PAST COUPLE OF HOURS WITH A HISTORY OF
POTENTIALLY SIGNIFICANT DAMAGING WIND AND/OR TORNADO DAMAGE ALONG
ITS PATH ACROSS SERN KS INTO SWRN MO. IT HAD BEEN COINCIDENT WITH
SURFACE THETA-E AXIS /RUNNING FROM JLN SWWD/...BUT APPEARS TO HAVE
SHIFTED E OF THAT INTO AN ENVIRONMENT CHARACTERIZED BY MIDDLE 50S
DEW POINTS. AS SUCH...SOME WEAKENING APPEARS POSSIBLE...BUT 0-1 KM
SRH AOA 600 M2/S2 WILL STILL BE QUITE FAVORABLE FOR A PERSISTENT
DAMAGING WIND/TORNADO RISK TO EXTEND QUICKLY EWD INTO S-CNTRL MO.

..GRAMS.. 02/29/2012

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

ATTN...WFO...LSX...SGF...EAX...TSA...

LAT...LON   38159380 38369271 38309201 37809198 36889264 36479384
            35819475 35409537 35419573 35719582 36299548 36909490
            37229424 37509400 38159380

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 28, 10:30 PM CSTTornado WatchSPCBaxter, Benton, Boone, Carroll, Conway, Crawford and 20 more6 hr
Feb 29, 12:49 AM CSTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Chicot, Clay, Cleburne and 31 more56 min
Feb 29, 3:20 AM CSTTornado WatchSPCBaxter, Clay, Cleburne, Conway, Craighead, Fulton and 20 more9 hr
Feb 29, 3:53 AM CSTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Faulkner and 20 more97 min
Feb 29, 8:07 AM CSTMesoscale DiscussionSPCClay, Craighead, Greene, Independence, Jackson, Lawrence and 2 more53 min
Feb 29, 11:11 AM CSTMesoscale DiscussionSPCCrittenden, Mississippi2 hr
Feb 29, 11:46 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more89 min
Feb 29, 2:15 PM CSTSevere Thunderstorm WatchSPCAshley, Chicot6 hr
Feb 28, 8:23 PM CSTMesoscale DiscussionSPCAtchison, Holt, Nodaway37 min
Feb 28, 9:47 PM CSTMesoscale DiscussionSPCBates, Buchanan, Caldwell, Carroll, Cass, Clay and 9 more58 min
Feb 28, 10:07 PM CSTSevere Thunderstorm WatchSPCBates, Caldwell, Carroll, Cass, Clay, Clinton and 9 more3 hr
Feb 29, 1:14 AM CSTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Franklin and 19 more11 hr
Feb 28, 7:57 PM CSTMesoscale DiscussionSPCAlfalfa, Blaine, Garfield, Grant, Kay, Kingfisher and 6 more48 min
Feb 28, 8:10 PM CSTTornado WatchSPCCraig, Creek, Garfield, Grant, Kay, Lincoln and 15 more5 hr

Nearby

Mesoscale Discussions in Missouri, 2012Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Arkansas, 2012Every mesoscale discussion in 2012

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.