Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 416
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2012, 3:18 PM CDT for 4 states. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 3:18 PM CDT (20:18 UTC)
- Expired
- Apr 2, 2012, 5:15 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 54 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Union County, AR, Yell County, AR, Union Parish, LA, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Bowie County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Rains County, TX, Red River County, TX, Titus County, TX
The radar
The Shreveport radar (KSHV), 131 km from the middle of the area, began a volume at 20:20 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
Shreveport, LA (KSHV), launched 12:00Z, 8.3 hours before the alert went out and 130 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
- 1679 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -91 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
443
ACUS11 KWNS 022019
SWOMCD
SPC MCD 022018
ARZ000-LAZ000-TXZ000-OKZ000-022215-
MESOSCALE DISCUSSION 0416
NWS STORM PREDICTION CENTER NORMAN OK
0318 PM CDT MON APR 02 2012
AREAS AFFECTED...NERN TX/NRN LA/SERN OK/SRN AR
CONCERNING...SEVERE THUNDERSTORM WATCH 127...
VALID 022018Z - 022215Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 127
CONTINUES.
THREAT FOR DAMAGING WINDS AND HAIL CONTINUES AS STORMS MOVE NWD
ACROSS WW 127.
LATEST RADAR LOOP SHOWS THE EXPANDING/ARCING BAND OF STORMS ACROSS
WW 127 CONTINUING TO MOVE NWD AT 35 TO 40 KT...THROUGH A MODERATELY
UNSTABLE ENVIRONMENT. WHILE INSTABILITY DROPS OFF A BIT WITH NRN
EXTENT INTO PARTS OF NERN OK/NRN AR...FAVORABLE THERMODYNAMIC
ENVIRONMENT APPEARS TO EXTEND FAR ENOUGH N OF WW 127 THAT SEVERE
POTENTIAL MAY CONTINUE EXPANDING NWD. THUS...NEW WW MAY BE REQUIRED
IN THE NEXT HOUR N OF THE EXISTING WATCH.
..GOSS.. 04/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...JAN...LZK...SHV...TSA...FWD...OUN...
LAT...LON 32599604 33219634 34029652 35179598 35589430 35199224
33969171 33569129 32989195 32479199 32989317 33249415
33029555 32599604SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 17 more | 90 min |
| Apr 2, 12:41 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more | 6 hr |
| Apr 2, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 2, 3:23 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Apr 2, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Conway, Crawford, Desha, Faulkner, Franklin and 19 more | 4 hr |
| Apr 2, 5:58 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleveland, Conway, Dallas, Desha and 23 more | 62 min |
| Apr 2, 9:57 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 27 more | 63 min |
| Apr 2, 10:10 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 31 more | 7 hr |
| Apr 2, 5:36 PM CDT | Mesoscale Discussion | SPC | Orleans, Saint Bernard, Saint Tammany | 54 min |
| Apr 2, 3:00 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 16 more | 2 hr |
| Apr 2, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 16 more | 7 hr |
| Apr 2, 5:16 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 13 more | 2 hr |
| Apr 2, 6:51 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 17 more | 54 min |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Texas, 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.