Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 47
The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2012, 6:07 PM CST for 16 counties in Arkansas. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Jan 22, 2012, 6:07 PM CST (00:07 UTC)
- Expired
- Jan 22, 2012, 7:00 PM CST
- In force
- 53 min
- Issued by
- the Storm Prediction Center
Counties Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pulaski County, AR, Saline County, AR, Union County, AR
The radar
The Little Rock radar (KLZK), 121 km from the middle of the area, began a volume at 00:10 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
Shreveport, LA (KSHV), launched 00:00Z, 0.1 hours before the alert went out and 175 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
- 1190 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1056 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 235 m²/s²
- 0-3 km storm-relative helicity
- 339 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 6.9
The text
As transmitted, in the capitals the NWS used until 2016.
652
ACUS11 KWNS 230008
SWOMCD
SPC MCD 230007
ARZ000-LAZ000-TXZ000-230100-
MESOSCALE DISCUSSION 0047
NWS STORM PREDICTION CENTER NORMAN OK
0607 PM CST SUN JAN 22 2012
AREAS AFFECTED...SWRN AR
CONCERNING...TORNADO WATCH 5...
VALID 230007Z - 230100Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 5 CONTINUES.
A NARROW SPATIOTEMPORAL WINDOW EXISTS FOR POTENTIAL SEVERE
DEVELOPMENT IMMEDIATELY SW OF WW 5. TSTMS ARE EXPECTED TO MATURE
INTO WW 5...SUCH THAT AN ADDITIONAL WW IS NOT ANTICIPATED.
LEAD BAND OF TSTMS FROM INDEPENDENCE TO LAFAYETTE COUNTIES CONTINUES
TO GRADUALLY INCREASE IN BOTH REFLECTIVITY AND CG LIGHTNING TRENDS
AS CELLS MATURE WITHIN AN EXTREME LOW-LEVEL SHEAR ENVIRONMENT.
SECONDARY AREA OF CELLS HAVE INCREASED FARTHER W IN CO-LOCATION WITH
THE BAND OF GREATEST DCVA ASSOCIATED WITH THE PIVOTING SHORT WAVE
IMPULSE. AS THIS IMPULSE EJECTS E/NEWD...BOTH AREAS OF TSTMS SHOULD
MORE RAPIDLY MATURE INTO WW 5 THIS EVENING...WITH THIS SCENARIO
APPEARING WELL REPRESENTED BY THE 21Z HRRR. HOWEVER THROUGH ABOUT
02Z...A SMALL CORRIDOR EXISTS FOR ISOLATED SEVERE POTENTIAL
/INCLUDING A TORNADO/ OVER SWRN AR.
..GRAMS.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...
LAT...LON 34919200 34399194 33049219 32979283 32979370 33299399
33629404 33839394 34389337 34809275 34919200SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 6:48 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Cleveland, Craighead, Cross and 19 more | 57 min |
| Jan 22, 7:59 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Columbia, Ouachita, Union | 91 min |
| Jan 22, 8:37 PM CST | Mesoscale Discussion | SPC | Arkansas, Bradley, Chicot, Clay, Craighead, Crittenden and 14 more | 83 min |
| Jan 22, 9:47 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Crittenden, Desha, Phillips | 58 min |
| Jan 22, 10:59 PM CST | Tornado Watch | SPC | Ashley, Chicot | 7 hr |
Nearby
Mesoscale Discussions in Arkansas, 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.