Alert archive / Missouri / Mesoscale Discussions in 2011
Mesoscale Discussion 1850
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2011, 6:04 AM CDT for 9 counties in Illinois; Ballard County, Kentucky; 36 counties in Missouri. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 6:04 AM CDT (11:04 UTC)
- Expired
- Aug 4, 2011, 7:30 AM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 46 counties
Alexander County, IL, Jackson County, IL, Johnson County, IL, Monroe County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Benton County, MO, Bollinger County, MO, Camden County, MO, Cape Girardeau County, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Madison County, MO, Maries County, MO, Miller County, MO, Mississippi County, MO, Morgan County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Webster County, MO, Wright County, MO
The radar
The St Louis radar (KLSX), 138 km from the middle of the area, began a volume at 11:06 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 00:00Z, 11.1 hours before the alert went out and 211 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
- 3561 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 2210 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
The text
As transmitted, in the capitals the NWS used until 2016.
387
ACUS11 KWNS 041104
SWOMCD
SPC MCD 041104
ILZ000-KYZ000-MOZ000-041230-
MESOSCALE DISCUSSION 1850
NWS STORM PREDICTION CENTER NORMAN OK
0604 AM CDT THU AUG 04 2011
AREAS AFFECTED...SCNTRL MO...SRN IL...FAR WRN KY
CONCERNING...SEVERE THUNDERSTORM WATCH 725...
VALID 041104Z - 041230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 725
CONTINUES.
A SEVERE THREAT WILL LIKELY CONTINUE TO MOVE EWD ACROSS SCNTRL MO
AND MAY REACH SRN IL LATER THIS MORNING. WIND DAMAGE AND HAIL WILL
BE POSSIBLE WITH THE MORE INTENSE LINE-SEGMENTS. WW ISSUANCE MAY BE
NEEDED EAST OF WW 725 AS THE LINE APPROACHES SE MO OVER THE NEXT 1
TO 2 HOURS.
A LINE OF STRONG TO SEVERE THUNDERSTORMS IS ONGOING NEAR SPRINGFIELD
MO LOCATED ALONG THE NRN EDGE OF MODERATE INSTABILITY WHERE MLCAPE
VALUES ARE ESTIMATED IN THE 1000 TO 2000 J/KG RANGE. THE MCS MAY
TURN ESEWD ACROSS SE MO FOLLOWING THE TIGHT GRADIENT OF MODERATE
INSTABILITY. ELY FLOW AT THE SFC ALONG WITH A STRONG FORWARD
PROPAGATION SHOULD HELP MAINTAIN AN ISOLATED WIND DAMAGE THREAT AS
THE LINEAR MCS MOVES INTO THE MS VALLEY. ALTHOUGH SOME WEAKENING
COULD OCCUR...THE LINE MAY ALSO REGENERATE ESPECIALLY AFTER THE SUN
COMES UP AND SFC TEMPS BEGIN TO WARM.
..BROYLES.. 08/04/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...LSX...SGF...EAX...
LAT...LON 38369362 37439378 37139305 37099148 36588911 37668865
38198946 38669205 38369362SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:06 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Pulaski | 4 hr |
| Aug 4, 10:21 AM CDT | Mesoscale Discussion | SPC | Alexander | 84 min |
| Aug 4, 2:10 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 35 more | 80 min |
| Aug 4, 3:28 AM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cedar, Christian and 32 more | 7 hr |
Nearby
Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Kentucky, 2011Every mesoscale discussion in 2011
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.