Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 1047
The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2012, 3:39 AM CDT for 12 counties in Arkansas; Sequoyah County, Oklahoma. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2012, 3:39 AM CDT (08:39 UTC)
- Expired
- Jun 4, 2012, 5:15 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Perry County, AR, Pope County, AR, Sebastian County, AR, Van Buren County, AR, Yell County, AR, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 66 km from the middle of the area, began a volume at 08:40 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, 8.7 hours before the alert went out and 171 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
- 1781 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 936 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 228 m²/s²
- 0-3 km storm-relative helicity
- 352 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 12.1
The text
As transmitted, in the capitals the NWS used until 2016.
469 ACUS11 KWNS 040839 SWOMCD SPC MCD 040839 ARZ000-OKZ000-041015- MESOSCALE DISCUSSION 1047 NWS STORM PREDICTION CENTER NORMAN OK 0339 AM CDT MON JUN 04 2012 AREAS AFFECTED...ERN OK THROUGH NCNTRL AR CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 040839Z - 041015Z PROBABILITY OF WATCH ISSUANCE...40 PERCENT SUMMARY...STORMS MAY CONTINUE TO POSE A RISK FOR ISOLATED DAMAGING WIND AS THEY MOVE THROUGH NWRN AND EVENTUALLY NCNTRL AR EARLY THIS MORNING. TRENDS ARE BEING MONITORED FOR POSSIBLE SEVERE THUNDERSTORM WATCH EAST OF WW 350 TO INCLUDE NCNTRL AR. DISCUSSION...A SURGING OUTFLOW BOUNDARY HAS CONTRIBUTED TO THE DEVELOPMENT OF A MESO-VORTEX OVER NERN OK. STRONGEST STORMS EXIST ALONG SERN PORTION OF OUTFLOW BOUNDARY TO THE SOUTH OF MESO-VORTEX. THIS LINE SEGMENT MAY CONTINUE TO BOW AND ACCELERATE EWD INTO NWRN AR WHERE THE CAP IS WEAKER THAN FARTHER WEST...AND WHERE A RESERVOIR OF 1000-1500 J/KG MUCAPE EXISTS. LIMITING FACTORS INCLUDE RELATIVELY WEAK MID LEVEL WINDS AND A STABLE BOUNDARY LAYER...SO DURATION OF THE DAMAGING WIND THREAT IS SOMEWHAT UNCERTAIN. ..DIAL/HART.. 06/04/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...TSA... LAT...LON 35349524 35979417 35819190 34809169 34959360 35349524
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 7:09 PM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 5 more | 7 hr |
| Jun 3, 7:47 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Washington | 58 min |
| Jun 3, 8:34 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Faulkner, Greene and 6 more | 56 min |
| Jun 3, 11:25 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| Jun 4, 1:51 AM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Madison, Washington | 54 min |
| Jun 4, 3:14 AM CDT | Mesoscale Discussion | SPC | Crittenden | 91 min |
| Jun 4, 1:07 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Cleburne, Cleveland, Conway and 19 more | 113 min |
| Jun 4, 5:06 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 13 more | 114 min |
| Jun 3, 8:03 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more | 57 min |
| Jun 3, 9:46 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 27 more | 59 min |
| Jun 3, 10:06 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more | 3 hr |
| Jun 4, 3:59 PM CDT | Mesoscale Discussion | SPC | Cimarron, Texas | 91 min |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012
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.