Alert archive / Alabama / Mesoscale Discussions in 2016
Mesoscale Discussion 503
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2016, 4:29 PM CDT for 22 counties in Alabama; Lowndes County, Noxubee County, Mississippi. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2016, 4:29 PM CDT (21:29 UTC)
- Expired
- Apr 29, 2016, 6:00 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 24 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Chilton County, AL, Cullman County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Lowndes County, MS, Noxubee County, MS
The radar
The Columbus AFB radar (KGWX), 83 km from the middle of the area, began a volume at 21:30 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
Birmingham, AL (KBMX), launched 12:00Z, 9.5 hours before the alert went out and 84 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
- 481 J/kg
- Mixed-layer CIN
- -167 J/kg
- Mixed-layer LCL
- 1110 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
973
ACUS11 KWNS 292129
SWOMCD
SPC MCD 292129
ALZ000-MSZ000-292300-
MESOSCALE DISCUSSION 0503
NWS STORM PREDICTION CENTER NORMAN OK
0429 PM CDT FRI APR 29 2016
AREAS AFFECTED...PORTIONS OF FAR EASTERN MS AND NORTHERN/CENTRAL AL
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 292129Z - 292300Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...A CLUSTER OF STORMS WILL CONTINUE TO POSE A THREAT FOR A
FEW STRONG WIND GUSTS AND A LARGE HAIL REPORT OR TWO. HOWEVER...THE
LIMITED NATURE OF THE THREAT PRECLUDES WATCH ISSUANCE.
DISCUSSION...A QUASI-LINEAR COMPLEX OF STRONG TO OCCASIONALLY SEVERE
STORMS CONTINUES EAST/SOUTHEASTWARD ACROSS FAR EASTERN MS AND
NORTHERN/CENTRAL AL. THESE STORMS SHOULD GENERALLY FOLLOW AN
INSTABILITY AXIS TO THEIR EAST/SOUTHEAST...WHERE PRIOR SFC HEATING
HAS PROMOTED STEEPENED LOW-LEVEL LAPSE RATES AND AN ENVIRONMENT
FAVORABLE FOR STRONG WIND GUSTS. ADDITIONALLY...ADVECTION OF
WARM/MOIST AIR IS FAVORING PROPAGATION ALONG THE SOUTHERN END OF THE
COMPLEX. MERGING COLD POOLS AND ANY EMBEDDED ROTATING ELEMENTS WILL
FAVOR POCKETS OF GUSTY WINDS OVER THE NEXT FEW HOURS. HOWEVER...THE
THREAT SHOULD SLOWLY DIMINISH AS BOUNDARY-LAYER STABILIZATION OCCURS
AND CELLS BECOME MORE OUTFLOW-DOMINANT THIS EVENING.
..PICCA/HART.. 04/29/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BMX...HUN...MEG...JAN...
LAT...LON 33558867 34368772 34778725 34608620 34348588 33488576
32758674 32708804 32898857 33298872 33558867SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 9:46 AM CDT | Mesoscale Discussion | SPC | Bolivar, Coahoma, Washington | 89 min |
| Apr 29, 12:37 PM CDT | Mesoscale Discussion | SPC | Attala, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 34 more | 83 min |
Nearby
Mesoscale Discussions in Alabama, 2016Mesoscale Discussions in Mississippi, 2016Every mesoscale discussion in 2016
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.