Alert archive / Missouri / Mesoscale Discussions in 2011
Mesoscale Discussion 764
The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 4:54 PM CDT for 8 counties in Kansas; 31 counties in Missouri. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 12, 2011, 4:54 PM CDT (21:54 UTC)
- Expired
- May 12, 2011, 6:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 39 counties
Atchison County, KS, Douglas County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Bates County, MO, Benton County, MO, Boone County, MO, Buchanan County, MO, Caldwell County, MO, Camden County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Moniteau County, MO, Morgan County, MO, Pettis County, MO, Platte County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, St. Clair County, MO, Vernon County, MO
The radar
The Pleasant Hill radar (KEAX), 56 km from the middle of the area, began a volume at 21:54 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
Topeka, KS (KTOP), launched 12:00Z, 9.9 hours before the alert went out and 174 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
- 3 J/kg
- Mixed-layer CIN
- -335 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
807
ACUS11 KWNS 122155
SWOMCD
SPC MCD 122154
MOZ000-KSZ000-122300-
MESOSCALE DISCUSSION 0764
NWS STORM PREDICTION CENTER NORMAN OK
0454 PM CDT THU MAY 12 2011
AREAS AFFECTED...FAR EASTERN KS AND WESTERN/CENTRAL MO
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 122154Z - 122300Z
MONITORING FOR THE POSSIBILITY OF A NEW WATCH ACROSS PORTIONS OF
WESTERN/CENTRAL MO...AND PERHAPS EVEN FAR EASTERN KS. PORTIONS OF
SEVERE TSTM WATCH 293 HAVE BEEN SPATIALLY EXTENDED ACROSS SOUTHWEST
MO.
AMID A CORRIDOR OF PRE-DRYLINE CONFLUENCE...VISIBLE SATELLITE
IMAGERY REFLECTS A MATURING/DEEPENING CU FIELD ACROSS FAR SOUTHEAST
KS/SOUTHWEST MO WITH SCATTERED TSTM DEVELOPMENT ONGOING IN THESE
AREAS...WITH A SEPARATE /BUT SOMEWHAT FLATTER/ CU FIELD ALSO NOTED
OVER NORTHEAST KS IN CLOSER PROXIMITY TO THE ARCING SURFACE FRONT.
THERE IS CONCERN THAT STRONG/SEVERE TSTMS WILL CONTINUE TO
DEVELOP/EXPAND NORTHEASTWARD ACROSS FAR EASTERN KS INTO
WESTERN/CENTRAL MO THIS EVENING. SHOULD THIS OCCUR...VERY STEEP MID
LEVEL LAPSE RATES /IN CLOSE PROXIMITY TO THE CENTRAL PLAINS STACKED
CYCLONE/ AND MLCAPE ON THE ORDER OF 2000 J/KG...IN THE PRESENCE OF
MODERATELY STRONG/BUT GENERALLY UNIDIRECTIONAL WIND PROFILES...WOULD
SUPPORT SOME SUPERCELLS/ORGANIZED MULTICELLS CAPABLE OF LARGE
HAIL...DAMAGING WINDS...AND PERHAPS A BRIEF TORNADO.
..GUYER.. 05/12/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LSX...SGF...EAX...TOP...
LAT...LON 37789361 37899491 39339562 39919497 40019375 39999281
39619227 38899208 37889264 37789361SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:51 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Norton, Rawlins, Sherman, Thomas | 84 min |
| May 11, 8:16 PM CDT | Mesoscale Discussion | SPC | Brown, Nemaha | 59 min |
| May 12, 2:37 PM CDT | Tornado Watch | SPC | Cloud, Jewell, Mitchell, Phillips, Republic, Smith and 1 more | 7 hr |
| May 12, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Bourbon, Cherokee, Crawford | 7 hr |
| May 12, 5:31 PM CDT | Severe Thunderstorm Watch | SPC | Linn, Miami | 6 hr |
| May 12, 6:30 PM CDT | Mesoscale Discussion | SPC | Cherokee | 90 min |
| May 12, 1:46 PM CDT | Mesoscale Discussion | SPC | McDonald, Newton | 119 min |
Nearby
Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Kansas, 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.