Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 324
The Storm Prediction Center issued this mesoscale discussion at Mar 22, 2012, 2:28 AM CDT for Mobile County, Washington County, Alabama; George County, Greene County, Jackson County, Mississippi. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 22, 2012, 2:28 AM CDT (07:28 UTC)
- Expired
- Mar 22, 2012, 4:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Mobile County, AL, Washington County, AL, George County, MS, Greene County, MS, Jackson County, MS
The radar
The Mobile radar (KMOB), 28 km from the middle of the area, began a volume at 07:29 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 7.5 hours before the alert went out and 121 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
- 131 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 505 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
131
ACUS11 KWNS 220728
SWOMCD
SPC MCD 220728
ALZ000-MSZ000-LAZ000-220930-
MESOSCALE DISCUSSION 0324
NWS STORM PREDICTION CENTER NORMAN OK
0228 AM CDT THU MAR 22 2012
AREAS AFFECTED...PARTS OF COASTAL SOUTHEAST LOUISIANA...SRN MS AND
SWRN AL
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 220728Z - 220930Z
AN ADDITIONAL WW IS NOT ANTICIPATED.
THUNDERSTORM ACTIVITY CONTINUES NEAR A WEAK SURFACE LOW...OR ZONE OF
ENHANCED LOW-LEVEL CONVERGENCE...ALONG THE STALLED OR VERY SLOW
EASTWARD MOVING CONVECTIVE OUTFLOW BOUNDARY NEAR SOUTHEASTERN
LOUISIANA AND SOUTHERN MISSISSIPPI COASTAL AREAS. AND THIS MAY
CONTINUE THROUGH MUCH OF THE REMAINDER OF THE NIGHT...IN THE
PRESENCE OF WEAK TO MODERATE CAPE ASSOCIATED WITH THE WEDGE OF MOIST
BOUNDARY LAYER AIR CHARACTERIZED BY 70F SURFACE DEW POINTS NOSING
ACROSS COASTAL AREAS NEAR/WEST OF MOBILE BAY. FLOW ALOFT WILL
REMAIN STRONGLY DIFLUENT...DOWNSTREAM OF A SHORT WAVE IMPULSE
PIVOTING AROUND THE LARGE SLOW MOVING UPPER LOW NOW CENTERED OVER
THE RED RIVER VALLEY.
VWP DATA FROM MOBILE DOES CONTINUE TO INDICATE THE PRESENCE OF AT
LEAST MODESTLY LARGE LOW-LEVEL SHEAR...BUT LATEST RUC GUIDANCE
CONTINUES TO SUGGEST THAT THIS WILL WEAKEN BY 09-10Z...AS 850 MB
FLOW ALONG COASTAL AREAS BEGINS TO DECREASE BELOW 30 KTS.
SUFFICIENT DEEP LAYER SHEAR MAY PERSIST FOR THE CONTINUING EVOLUTION
OF OCCASIONAL MID-LEVEL UPDRAFT ROTATION...BUT LOW TORNADIC
POTENTIAL SEEMS LIKELY TO DIMINISH FURTHER THROUGH DAYBREAK.
..KERR.. 03/22/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MOB...LIX...
LAT...LON 30968891 31788834 31168774 29838798 29438847 29568898
30968891SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 6:49 AM CDT | Mesoscale Discussion | SPC | Mobile | 116 min |
| Mar 22, 9:53 AM CDT | Mesoscale Discussion | SPC | Baldwin, Clarke, Mobile, Washington | 67 min |
| Mar 22, 10:55 AM CDT | Tornado Watch | SPC | Baldwin, Clarke, Mobile, Monroe, Washington, Wilcox | 6 hr |
| Mar 22, 1:00 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Conecuh and 10 more | 60 min |
| Mar 22, 3:30 PM CDT | Mesoscale Discussion | SPC | Baldwin, Conecuh, Escambia, Mobile, Monroe, Wilcox | 60 min |
| Mar 21, 9:27 PM CDT | Mesoscale Discussion | SPC | Clarke, Forrest, George, Greene, Hancock, Harrison and 8 more | 93 min |
| Mar 21, 11:49 PM CDT | Mesoscale Discussion | SPC | Clarke, George, Greene, Harrison, Jackson, Lauderdale and 2 more | 56 min |
| Mar 22, 7:15 AM CDT | Tornado Watch | SPC | George, Harrison, Jackson, Stone | 5 hr |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Alabama, 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.