Alert archive / Missouri / Mesoscale Discussions in 2003
Mesoscale Discussion 1815
The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 4:44 PM CDT for 18 counties in Arkansas; 20 counties in Missouri. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2003, 4:44 PM CDT (21:44 UTC)
- Expired
- Jul 13, 2003, 5:45 PM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 38 counties
Baxter County, AR, Boone County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Poinsett County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Woodruff County, AR, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Dunklin County, MO, Greene County, MO, Howell County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Oregon County, MO, Ozark County, MO, Polk County, MO, Ripley County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 163 km from the middle of the area, began a volume at 21:28 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 12:00Z, 9.7 hours before the alert went out and 177 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.
- Mixed-layer CAPE
- 1689 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 835 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.4
The text
As transmitted, in the capitals the NWS used until 2016.
727 ACUS11 KWNS 132145 SWOMCD SPC MCD 132144 MOZ000-ARZ000-132245- MESOSCALE DISCUSSION 1815 NWS STORM PREDICTION CENTER NORMAN OK 0444 PM CDT SUN JUL 13 2003 AREAS AFFECTED...SRN MO AND NERN AR CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 132144Z - 132245Z WW WILL BE ISSUED SHORTLY FOR PORTIONS OF SRN MO SEWD INTO NERN AR. STORMS HAVE DEVELOPED RAPIDLY IN THE PAST HOUR FROM SRN MO SEWD ACROSS NERN AR ALONG AN OLD OUTFLOW BOUNDARY AND INSTABILITY AXIS WHERE MLCAPES ARE NEAR 3000 J/KG. MODERATELY STRONG NWLY MID LEVEL FLOW IS RESULTING IN 30-40 KT DEEP SHEAR AND STORMS WITH LARGE HAIL AND WIND DAMAGE ARE LIKELY ACROSS THIS AREA FOR THE NEXT SEVERAL HOURS. ..IMY.. 07/13/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...PAH...MEG...LZK...SGF...TSA... 35219082 35099148 36419353 37239433 37169436 37979320 37779264 37099112 36028987 35649035 35469069
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 11:30 AM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 11 more | 2 hr |
| Jul 13, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more | 6 hr |
| Jul 13, 1:30 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Franklin, Johnson and 6 more | 60 min |
| Jul 13, 3:53 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Chicot, Crittenden, Desha, Lee and 3 more | 67 min |
| Jul 13, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Cleburne, Craighead, Crittenden and 18 more | 5 hr |
| Jul 13, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | Chicot | 4 hr |
| Jul 13, 6:54 PM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Jackson, Lee, Monroe, Poinsett and 4 more | 96 min |
Nearby
Mesoscale Discussions in Missouri, 2003Mesoscale Discussions in Arkansas, 2003Every 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.