Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 85
The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2012, 1:22 PM CST for 4 states. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Feb 1, 2012, 1:22 PM CST (19:22 UTC)
- Expired
- Feb 1, 2012, 3:15 PM CST
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 58 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, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Union County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Union Parish, LA, Webster Parish, LA, LeFlore County, OK, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX
The radar
The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 19:25 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, 7.4 hours before the alert went out and 171 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
- 302 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 588 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
606 ACUS11 KWNS 011923 SWOMCD SPC MCD 011922 ARZ000-MSZ000-LAZ000-TXZ000-OKZ000-012115- MESOSCALE DISCUSSION 0085 NWS STORM PREDICTION CENTER NORMAN OK 0122 PM CST WED FEB 01 2012 AREAS AFFECTED...FROM CNTRL AR SWWD INTO THE ARKLATEX CONCERNING...SEVERE THUNDERSTORM WATCH 20... VALID 011922Z - 012115Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 20 CONTINUES. SEVERE HAIL THREAT IS INCREASING OVER THE REGION...WITH A DECIDED UPSWING IN THE INTENSITY OF A LEADING STORM OVER W CNTRL AR. RADAR INDICATES SEVERE HAIL IS LIKELY WITH THIS STORM...AND GIVEN PARAMETERS IN PLACE INCLUDING HODOGRAPH LENGTH AS WELL AS STORM STRUCTURE...THIS STORM MAY BE PRODUCING LARGE AMOUNTS OF HAIL IN ADDITION TO LARGE SIZES. AT THE CURRENT SPEED...THESE HAIL STORMS WILL AFFECT THE LITTLE ROCK AREA BETWEEN 230-300 PM LOCAL TIME. OTHER STORMS WERE STRENGTHENING OVER SWRN AR...WITH OTHER CELLS NOW DEVELOPING OVER NERN TX. VERY LARGE HAIL WILL CONTINUE TO BE THE PRIMARY SEVERE THREAT...BUT DAMAGING WINDS MAY ALSO OCCUR. WEAK LOW LEVEL SHEAR WILL CONTINUE TO MINIMIZE THE RISK OF TORNADOES. ..JEWELL.. 02/01/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MEG...JAN...LZK...SHV...TSA... LAT...LON 33069110 32029512 34819514 35819110 33069110
SPC 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, 2:58 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more | 2 hr |
| 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 |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Texas, 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.