Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 441
The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 7:01 PM CDT for 21 counties in Arkansas. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2012, 7:01 PM CDT (00:01 UTC)
- Expired
- Apr 3, 2012, 8:00 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 21 counties
Clark County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Nevada County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR
The radar
The Western Arkansas radar (KSRX), 74 km from the middle of the area, began a volume at 00:04 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
Springfield, MO (KSGF), launched 00:00Z, 0.0 hours before the alert went out and 221 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
- 140 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 1481 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
542
ACUS11 KWNS 040001
SWOMCD
SPC MCD 040001
ARZ000-OKZ000-040100-
MESOSCALE DISCUSSION 0441
NWS STORM PREDICTION CENTER NORMAN OK
0701 PM CDT TUE APR 03 2012
AREAS AFFECTED...ERN OK...WRN AR
CONCERNING...SEVERE THUNDERSTORM WATCH 136...
VALID 040001Z - 040100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 136
CONTINUES.
PRIMARY SVR THREAT APPEARS TO BE BIFURCATED BY RELATIVELY STABLE AIR
OVER SERN OK WITHIN A SWATH OF PERSISTENT PRECIPITATION. STRONG/SVR
TSTM ALONG NRN EDGE OF ONGOING CONVECTION IS MOVING ALONG A WEAK
WIND SHIFT/CONFLUENCE LINE NOTED IN 23Z SFC ANALYSIS...BUT WILL
EVENTUALLY ENCOUNTER SLIGHTLY DRIER BOUNDARY LAYER AIR OVER NWRN
AR...WHERE DEW POINTS ARE IN THE MID 50S. FARTHER S...MORE VIGOROUS
CONVECTION IS NOW ENTERING SWRN AR...INTO A COOLER AIR MASS TO THE N
OF EARLIER OUTFLOW BOUNDARY. NONETHELESS...A HAIL/DMGG WIND GUST
THREAT WILL STILL EXIST WITH THE STRONGEST STORMS AS THEY MOVE
ACROSS WRN AR.
..ROGERS.. 04/04/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...TSA...
LAT...LON 33569298 33509378 34349457 35239464 35689446 35939414
36119352 35929298 35339288 33569298SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 8:47 PM CDT | Mesoscale Discussion | SPC | Union | 58 min |
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.