Alert archive / Missouri / Mesoscale Discussions in 2003

Mesoscale Discussion 604

April 28, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2003, 12:09 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 28, 2003, 12:09 PM CDT (17:09 UTC)
Expired: Apr 28, 2003, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 54 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Marion County, AR, Washington County, AR, Allen County, KS, Anderson County, KS, Bourbon County, KS, Cherokee County, KS, Coffey County, KS, Crawford County, KS, Labette County, KS, Linn County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Miller County, MO, Newton County, MO, Ozark County, MO, Polk County, MO, Pulaski County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Craig County, OK, Delaware County, OK, Mayes County, OK, Nowata County, OK, Ottawa County, OK, Rogers County, OK

The radar

The Springfield radar (KSGF), 77 km from the middle of the area, began a volume at 17:08 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.

Severe Thunderstorm Watch 175Apr 28, 2:35 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.2 hours before the alert went out and 78 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: 91 J/kg
Mixed-layer CIN: -341 J/kg
Mixed-layer LCL: 1785 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 217 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.

791 
ACUS11 KWNS 281710
SWOMCD
SPC MCD 281709 
ARZ000-MOZ000-OKZ000-KSZ000-281915-

MESOSCALE DISCUSSION 0604
NWS STORM PREDICTION CENTER NORMAN OK
1209 PM CDT MON APR 28 2003

AREAS AFFECTED...SWRN MO/SERN KS/NERN OK

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 281709Z - 281915Z

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS SWRN MO AND
SERN KS OVER THE NEXT 1 TO 2 HOURS. THE CONVECTION SHOULD MOVE ESEWD
ACROSS SWRN-SCNTRL MO AND MAY AFFECT NWRN AR/NERN OK. LARGE HAIL
SHOULD BE THE PRIMARY THREAT. WW MAY BE NEEDED WITHIN THE NEXT FEW
HOURS.

OUTFLOW BOUNDARY WAS LOCATED FROM N OF SPRINGFIELD MO EXTENDING WWD
TO WICHITA KS. SURFACE DEWPOINTS OF 60-65 F EXISTED ALONG AND TO THE
S OF THE BOUNDARY. TEMPERATURES IN THE LOWER 80S F WERE CONTRIBUTING
TO MODERATE INSTABILITY WITH MLCAPE VALUES AROUND 1500 J/KG. AS
CONVERGENCE INCREASES...STORM INITIATION SHOULD OCCUR IN THE
VICINITY OF THE BOUNDARY BY 19Z. 0-6 KM SHEAR IN THIS REGION WAS
AROUND 25 KNOTS SUGGESTING THE CONVECTION WILL REMAIN MULTICELLULAR.
STEEP MID-LEVEL LAPSE RATES AND MODERATE INSTABILITY SHOULD RESULT
IN A HAIL THREAT ACROSS SWRN-SCNTRL MO/SERN KS/NERN OK/NWRN AR. WW
MAY BE NECESSARY WITH THE NEXT HOUR OR TWO.   

..BROYLES.. 04/28/2003

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

ATTN...WFO...LZK...SGF...EAX...TSA...TOP...ICT...

38229606 38399488 38379319 38259232 37889197 36819182
36049220 35939406 36159572 37799602 38219609

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	Carroll	5 hr
Apr 28, 2:12 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 1 more	93 min
Apr 28, 5:10 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 22 more	65 min
Apr 28, 5:23 PM CDT	Mesoscale Discussion	SPC	Hamilton, Morton, Stanton	3 hr
Apr 28, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 12 more	3 hr
Apr 28, 3:56 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Camden, Cape Girardeau, Carter, Christian and 34 more	2 hr

Nearby

Mesoscale Discussions in Missouri, 2003 Mesoscale Discussions in Kansas, 2003 Mesoscale Discussions in Arkansas, 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.