Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 87
The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2012, 2:58 PM CST for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 1, 2012, 2:58 PM CST (20:58 UTC)
- Expired
- Feb 1, 2012, 5:00 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 60 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Benton County, MS, Bolivar County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Humphreys County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Fayette County, TN, Shelby County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 20:58 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
Little Rock, AR (KLZK), launched 12:00Z, 9.0 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
- 34 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
379
ACUS11 KWNS 012059
SWOMCD
SPC MCD 012058
MSZ000-TNZ000-ARZ000-LAZ000-012300-
MESOSCALE DISCUSSION 0087
NWS STORM PREDICTION CENTER NORMAN OK
0258 PM CST WED FEB 01 2012
AREAS AFFECTED...AR...NRN LA...WRN TN AND NWRN MS
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 012058Z - 012300Z
SEVERE STORMS WITH HAIL CONTINUE OVER CNTRL AR...EXTENDING SWD INTO
NRN LA. THE LEADING EDGE OF THE AR STORMS ARE APPROXIMATELY TWO
HOURS AWAY FROM THE MS RIVER AS OF 21Z....BUT A NEW WATCH MAY BE
REQUIRED LATER TODAY E OF THE CURRENT WATCH.
SURFACE ANALYSIS SHOWS TEMPERATURES INTO THE MID 70S OVER SRN AR AND
NRN LA WHERE HEATING CONTINUES. WITH DEWPOINTS FROM 58 TO 62
F...THIS SHOULD PROVE FAVORABLE FOR A CONTINUED THREAT OF SEVERE
STORMS PRODUCING LARGE HAIL. DEEP LAYER FLOW AND PROGRESSIVE NATURE
OF THE UPPER TROUGH MAY ALLOW SEVERE STORMS TO PERSIST INTO WRN TN
AND NWRN MS....WITH STORMS MOVING IN AN ENE DIRECTION AT
APPROXIMATELY 30 KT.
..JEWELL.. 02/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MEG...JAN...LZK...SHV...
LAT...LON 32149378 33629363 34549315 35289178 35588957 35118918
34278918 33468971 32809109 32149378SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 1, 10:18 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 43 more | 117 min |
| Feb 1, 12:37 PM CST | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 34 more | 5 hr |
| Feb 1, 1:22 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 35 more | 113 min |
| Feb 1, 3:45 PM CST | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Crittenden, Cross, Lee, Phillips and 1 more | 3 hr |
| Feb 1, 1:06 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Calcasieu, Cameron, East Feliciana and 5 more | 114 min |
| Feb 1, 1:36 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 12 more | 84 min |
| Feb 1, 5:18 PM CST | Mesoscale Discussion | SPC | Ascension, Livingston, Orleans, Saint Charles, Saint James, Saint John the Baptist and 2 more | 87 min |
| Feb 1, 4:49 PM CST | Mesoscale Discussion | SPC | Attala, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 17 more | 56 min |
| Feb 1, 4:59 PM CST | Severe Thunderstorm Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 21 more | 4 hr |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Louisiana, 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.