Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 48
The Storm Prediction Center issued this mesoscale discussion at Jan 22, 2012, 6:48 PM CST for 25 counties in Arkansas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Jan 22, 2012, 6:48 PM CST (00:48 UTC)
- Expired
- Jan 22, 2012, 7:45 PM CST
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 25 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Greene County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR
The radar
The Little Rock radar (KLZK), 65 km from the middle of the area, began a volume at 00:50 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 (KLZK), launched 00:00Z, 0.8 hours before the alert went out and 159 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
- 998 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 455 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 475 m²/s²
- 0-3 km storm-relative helicity
- 474 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.8
The text
As transmitted, in the capitals the NWS used until 2016.
274
ACUS11 KWNS 230048
SWOMCD
SPC MCD 230048
ARZ000-MOZ000-230145-
MESOSCALE DISCUSSION 0048
NWS STORM PREDICTION CENTER NORMAN OK
0648 PM CST SUN JAN 22 2012
AREAS AFFECTED...CNTRL/ERN AR
CONCERNING...TORNADO WATCH 5...
VALID 230048Z - 230145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 5 CONTINUES.
SEVERE POTENTIAL CONTINUES TO INCREASE ACROSS CNTRL AR AND INCIPIENT
REGIONAL TORNADO OUTBREAK APPEARS TO BE UNFOLDING...WITH PROBABLE
SIGNIFICANT TORNADOES DEVELOPING ACROSS S-CNTRL INTO NERN AR.
AS OF 0045Z...LEAD BROKEN BAND OF TSTMS EXTENDED IN A NNE-SSW
ORIENTATION FROM RANDOLPH TO COLUMBIA COUNTIES. SEVERAL EMBEDDED
MESOCYCLONES CONTINUE TO INTENSIFY WITH INITIAL TORNADO WARNINGS
HAVING BEEN RECENTLY ISSUED ACROSS S-CNTRL AR. MODIFIED 00Z
LZK/SHV/JAN RAOBS SUGGEST MLCAPE OF 750-1250 J/KG IS PREVALENT AHEAD
OF THIS BAND FROM S-CNTRL TO E-CNTRL AR. WITH EFFECTIVE SRH NOW IN
EXCESS OF 500-600 M2/S2...EXTREME LOW-LEVEL SHEAR/VERY LARGE
HODOGRAPHS BREEDS HIGH CONFIDENCE IN SUSTAINED/LONG-TRACKED
SUPERCELLS CAPABLE OF PRODUCING SIGNIFICANT TORNADOES.
..GRAMS.. 01/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MEG...JAN...LZK...
LAT...LON 33599294 34599229 35819144 36129113 36209053 35869026
34919056 33629133 33479170 33309213 33449260 33599294SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 6:07 PM CST | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more | 53 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.