Alert archive / Missouri / Mesoscale Discussions in 2018
Mesoscale Discussion 331
The Storm Prediction Center issued this mesoscale discussion at May 3, 2018, 2:32 AM CDT for 12 counties in Arkansas; 9 counties in Illinois; 39 counties in Missouri. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- May 3, 2018, 2:32 AM CDT (07:32 UTC)
- Expired
- May 3, 2018, 4:00 AM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 60 counties
Baxter County, AR, Boone County, AR, Carroll County, AR, Franklin County, AR, Fulton County, AR, Izard County, AR, Johnson County, AR, Marion County, AR, Newton County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Scott County, IL, Camden County, MO, Carter County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Montgomery County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO
The radar
The Springfield radar (KSGF), 129 km from the middle of the area, began a volume at 07:34 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, 7.5 hours before the alert went out and 172 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
- 1170 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1041 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 164 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.6
The text
As transmitted.
801
ACUS11 KWNS 030733
SWOMCD
SPC MCD 030732
ILZ000-MOZ000-ARZ000-030900-
Mesoscale Discussion 0331
NWS Storm Prediction Center Norman OK
0232 AM CDT Thu May 03 2018
Areas affected...Northwest Arkansas...much of Missouri...western
Illinois
Concerning...Severe Thunderstorm Watch 68...
Valid 030732Z - 030900Z
The severe weather threat for Severe Thunderstorm Watch 68
continues.
SUMMARY...A line of storms will continue east across northern
Arkansas, southern and eastern Missouri, and western Illinois with
mainly a threat of locally damaging wind gusts.
DISCUSSION...A somewhat disjointed line of storms currently extends
from western IL into central MO, and approaching north central AR. A
relatively warm and moist air mass exists ahead of the line, with
dewpoints mainly in the mid 60s F. Surface temperatures remain in
the mid 70s F, but forecast soundings indicate this is a bit cool
relative to 700 mb temperatures resulting in a poor lapse rate.
Still, objective analysis indicates up to 400 m2/s2 effective SRH,
suggesting brief areas of rotation are possible along the line due
to sufficient instability.
..Jewell.. 05/03/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PAH...ILX...MEG...LSX...LZK...SGF...TSA...
LAT...LON 35399429 36059364 37289325 37879295 38409254 39319109
39659047 39688991 39218951 38208957 37069017 35919176
35639250 35399328 35399429SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 10:20 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 6 more | 115 min |
| May 2, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more | 7 hr |
| May 3, 9:02 AM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Sebastian, Washington | 88 min |
| May 3, 12:35 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Clark, Conway, Crawford, Franklin and 22 more | 85 min |
| May 3, 1:44 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Clark, Clay, Cleburne, Conway, Craighead and 34 more | 4 hr |
| May 3, 3:45 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 25 more | 60 min |
| May 3, 4:52 PM CDT | Mesoscale Discussion | SPC | Baxter, Clark, Clay, Cleburne, Cleveland, Conway and 31 more | 53 min |
| May 2, 7:21 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 24 more | 84 min |
| May 2, 10:01 PM CDT | Mesoscale Discussion | SPC | Bureau, DeKalb, DuPage, Grundy, Henderson, Henry and 18 more | 89 min |
| May 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Cook, DeKalb, DuPage, Ford, Fulton and 23 more | 4 hr |
| May 3, 1:57 AM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DeWitt, DuPage, Ford and 22 more | 93 min |
| May 2, 8:00 PM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Atchison, Bates, Benton, Buchanan and 33 more | 90 min |
| May 2, 11:09 PM CDT | Mesoscale Discussion | SPC | McDonald | 96 min |
| May 3, 2:36 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more | 114 min |
| May 3, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more | 6 hr |
| May 3, 5:58 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Gentry, Holt, Nodaway and 1 more | 92 min |
Nearby
Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Illinois, 2018Every mesoscale discussion in 2018
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.