Alert archive / Missouri / Mesoscale Discussions in 2003

Mesoscale Discussion 623

April 29, 20035 states

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2003, 5:11 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 29, 2003, 5:11 PM CDT (22:11 UTC)
Expired: Apr 29, 2003, 7:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 82 counties

Baxter County, AR, Boone County, AR, Clay County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Lawrence County, AR, Marion County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Stone County, AR, Alexander County, IL, Jackson County, IL, Monroe County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Union County, IL, Washington County, IL, Fulton County, KY, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Bollinger County, MO, Butler County, MO, Camden County, MO, Cape Girardeau County, MO, Carter County, MO, Cedar County, MO, Christian County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Dunklin County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Iron County, MO, Jasper County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Madison County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Mississippi County, MO, New Madrid County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Pemiscot County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, St. Clair County, MO, Stoddard County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO, Dyer County, TN, Lake County, TN, Obion County, TN

The radar

The Springfield radar (KSGF), 163 km from the middle of the area, began a volume at 22:13 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 12:00Z, 10.2 hours before the alert went out and 188 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 240 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1513 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 36 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.

737 
ACUS11 KWNS 292211
SWOMCD
SPC MCD 292211 
ILZ000-TNZ000-KYZ000-MOZ000-OKZ000-KSZ000-ARZ000-300015-

MESOSCALE DISCUSSION 0623
NWS STORM PREDICTION CENTER NORMAN OK
0511 PM CDT TUE APR 29 2003

AREAS AFFECTED...SRN MO...EXTREME NRN AR...SWRN IL...NWRN TN

CONCERNING...SEVERE THUNDERSTORM WATCH 179...

VALID 292211Z - 300015Z

WIDELY SCATTERED TSTMS SHOULD CONTINUE FROM AR/MO BORDER AREA OZARKS
ENEWD ACROSS MS VALLEY AND MOVING SLOWLY INTO SWRN IL.	THESE WILL
BE STRONG MULTICELLS WITH PRIMARY THREAT BEING LARGE HAIL...AND
OCCASIONAL DAMAGING MICROBURSTS POSSIBLE.  WEAK LOW-MIDLEVEL FLOW
AND SHEAR REGIME WILL REMAIN CONDUCIVE TO OUTFLOW DOMINANCE -- AS
EVIDENT ATTM WITH REFLECTIVITY RINGS PROPAGATING OUTWARD FROM
SEVERAL OF THE MULTICELL CLUSTERS.  ADDITIONAL CONVECTION MAY
DEVELOP RAPIDLY NEXT 2-3 HOURS BEFORE SUNSET...MAINLY ALONG OUTFLOW
BOUNDARIES AND EXPECIALLY WHERE THEY MAY COLLIDE. 

SFC MESOANALYSIS INDICATES DIFFUSE/RESIDUAL MESOALPHA SCALE OUTFLOW
BOUNDARY FROM MUCH EARLIER CONVECTION NEAR MO/AR BORDER...N OF WHICH
AIR MASS HAS HEATED AMIDST WEAKENED CAP TO PERMIT CONVECTIVE
DEVELOPMENT.  MODIFIED RAOBS AND RUC SOUNDINGS SHOW MLCAPE 1000-1500
J/KG ABOVE DEEPLY MIXED BOUNDARY LAYER...SUPPORTING MAINTENANCE OF
STRONG-SEVERE DOWNDRAFTS TO SFC.  THREAT SHOULD GRADUALLY DIMINISH
AFTER APPROXIMATELY 00Z -- SCHEDULED WW EXPIRATION TIME -- WHEN LOSS
OF INSOLATION AND INCREASING COVERAGE OF COMPOSITE OUTFLOW POOLS
WILL BEGIN TO SIGNIFICANTLY COOL/STABILIZE BOUNDARY LAYER.

..EDWARDS.. 04/29/2003

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

ATTN...WFO...PAH...MEG...LSX...SGF...EAX...TSA...PAH...MEG...LZK...SGF...

36499463 38379463 38398905 36498909 

36488908 35988932 35469024 36009314 36509328

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 7:10 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Fulton, Greene, Izard and 5 more	2 hr
Apr 29, 12:32 PM CDT	Mesoscale Discussion	SPC	Alexander, Hardin, Jackson, Johnson, Massac, Pope and 4 more	118 min
Apr 29, 2:05 PM CDT	Severe Thunderstorm Watch	SPC	Alexander, Jackson, Monroe, Perry, Pulaski, Randolph and 2 more	5 hr

Nearby

Mesoscale Discussions in Missouri, 2003 Mesoscale Discussions in Arkansas, 2003 Mesoscale Discussions in Illinois, 2003 Every mesoscale discussion in 2003

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.