Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 400
The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2012, 5:11 PM CDT for 13 counties in Arkansas; Dunklin County, Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2012, 5:11 PM CDT (22:11 UTC)
- Expired
- Mar 31, 2012, 6:15 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
Counties Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR, Woodruff County, AR, Dunklin County, MO
The radar
The Memphis radar (KNQA), 79 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.2 hours before the alert went out and 107 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
- 1894 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 915 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
311
ACUS11 KWNS 312211
SWOMCD
SPC MCD 312211
TNZ000-ARZ000-MSZ000-MOZ000-312315-
MESOSCALE DISCUSSION 0400
NWS STORM PREDICTION CENTER NORMAN OK
0511 PM CDT SAT MAR 31 2012
AREAS AFFECTED...NERN AR...MO BOOTHEEL...FAR WRN TN
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 312211Z - 312315Z
AN ISOLATED THREAT FOR LARGE HAIL/DMGG WIND GUSTS WILL EXIST THROUGH
EARLY EVENING OVER NERN AR AND FAR WRN TN. COVERAGE IS EXPECTED TO
REMAIN TOO LOW TO WARRANT ISSUANCE OF A NEW WW. A WWD EXTENSION OF
WW 121 IS UNCERTAIN DUE TO SPARSE CONVECTIVE COVERAGE OVER WRN
TN/NERN AR.
VISIBLE SATELLITE/MOSAIC RADAR COMPOSITE LOOPS SHOW A RAPIDLY
DEVELOPING TSTM 20 WSW POF...MOVING SSEWD TOWARDS NERN AR. THIS IS
OCCURRING ALONG A WEAKLY CONFLUENT AND SLOW-MOVING WARM FRONT...WITH
ADDITIONAL ASCENT PERHAPS AIDED BY A SUBTLE UPPER WAVE TRANSLATING
SEWD WITHIN THE ERN PERIPHERY OF A BUILDING UPPER RIDGE OVER THE
GREAT PLAINS. GIVEN WEAK LARGE-SCALE ASCENT AND INCREASING INFLUENCE
OF THE CNTRL CONUS UPPER RIDGE...TSTM ACTIVITY IS EXPECTED TO REMAIN
RATHER ISOLATED. HOWEVER...BACKGROUND ENVIRONMENT REMAINS FAVORABLE
FOR LARGE HAIL AND ISOLATED DMGG WIND GUSTS...GIVEN MIDLEVEL LAPSE
RATES OF 7.5-8 C/KM AND EFFECTIVE SHEAR NEAR 30 KTS.
..ROGERS.. 03/31/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...MEG...LZK...
LAT...LON 34799061 34909133 35749182 36399129 36649068 36359001
35548992 34999002 34799061SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 12:29 PM CDT | Mesoscale Discussion | SPC | Arkansas, Craighead, Crittenden, Cross, Desha, Lee and 7 more | 91 min |
Nearby
Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Missouri, 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.