Alert archive / Arkansas / Mesoscale Discussions in 2014
Mesoscale Discussion 855
The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2014, 12:49 PM CDT for 14 counties in Arkansas. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jun 6, 2014, 12:49 PM CDT (17:49 UTC)
- Expired
- Jun 6, 2014, 1:45 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
Counties Conway County, AR, Faulkner County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lonoke County, AR, Monroe County, AR, Perry County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Van Buren County, AR, White County, AR
The radar
The Little Rock radar (KLZK), 5 km from the middle of the area, began a volume at 17:48 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
Little Rock, AR (KBYH), launched 12:00Z, 5.8 hours before the alert went out and 215 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
- 1935 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 787 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 3.9
The text
As transmitted, in the capitals the NWS used until 2016.
277
ACUS11 KWNS 061750
SWOMCD
SPC MCD 061749
ARZ000-061845-
MESOSCALE DISCUSSION 0855
NWS STORM PREDICTION CENTER NORMAN OK
1249 PM CDT FRI JUN 06 2014
AREAS AFFECTED...CENTRAL ARKANSAS
CONCERNING...SEVERE THUNDERSTORM WATCH 239...
VALID 061749Z - 061845Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 239
CONTINUES.
SUMMARY...THE DAMAGING-WIND RISK IS SPREADING EWD ACROSS CNTRL AR.
DISCUSSION...THE LEADING CONVECTIVE LINE OF A TRAILING-STRATIFORM
MCS CONTINUES SPREADING EWD ACROSS CNTRL AR WITH FORWARD MOTION
AROUND 20-25 KT. THE DOWNSHEAR AIR MASS CONTINUES TO DESTABILIZE
WITH MIDDLE 80S SFC TEMPS AMIDST LOWER 70S DEWPOINTS SUPPORTING
AROUND 3000 J/KG MLCAPE PER A MODIFIED 12Z LZK RAOB. MID-LEVEL FLOW
IS ONLY MODEST -- AROUND 15-20 KT -- PER LZK VWP...BUT THE STRONG
BUOYANCY SHOULD FAVOR DOWNSHEAR REGENERATIVE CONVECTION AT THE
LEADING EDGE OF THE COLD POOL. DMGG WINDS WILL REMAIN POSSIBLE WITH
THIS ACTIVITY AS IT SPREADS EWD...REACHING THE LITTLE ROCK AREA IN
THE NEXT HOUR OR SO.
..COHEN.. 06/06/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...
LAT...LON 34259307 35459322 35659270 35509137 34689118 34209154
34259307SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 9:14 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll | 3 hr |
| Jun 5, 9:36 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Madison, Washington | 7 hr |
| Jun 6, 9:52 AM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 32 more | 53 min |
| Jun 6, 10:18 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Baxter, Benton, Boone, Bradley, Calhoun and 51 more | 5 hr |
| Jun 6, 11:22 AM CDT | Mesoscale Discussion | SPC | Crittenden, Lee, Phillips, St. Francis | 83 min |
| Jun 6, 11:51 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more | 7 hr |
| Jun 6, 2:43 PM CDT | Mesoscale Discussion | SPC | Arkansas, Cleburne, Craighead, Crittenden, Cross, Desha and 22 more | 92 min |
Nearby
Mesoscale Discussions in Arkansas, 2014Every mesoscale discussion in 2014
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.