Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 88
The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2012, 4:49 PM CST for 23 counties in Mississippi. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Feb 1, 2012, 4:49 PM CST (22:49 UTC)
- Expired
- Feb 1, 2012, 5:45 PM CST
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 23 counties
Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS
The radar
The Columbus AFB radar (KGWX), 98 km from the middle of the area, began a volume at 22:49 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
Little Rock, AR (KLZK), launched 12:00Z, 10.8 hours before the alert went out and 131 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
- 34 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
539
ACUS11 KWNS 012250
SWOMCD
SPC MCD 012249
MSZ000-012345-
MESOSCALE DISCUSSION 0088
NWS STORM PREDICTION CENTER NORMAN OK
0449 PM CST WED FEB 01 2012
AREAS AFFECTED...NERN MS
CONCERNING...SEVERE THUNDERSTORM WATCH 20...21...
VALID 012249Z - 012345Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
20...21...CONTINUES.
AN ORGANIZED LEADING-LINE/TRAILING-STRATIFORM MCS CONTINUES MOVING
EWD AT 35-40 KT FROM WW 20 INTO WW 21. DESPITE MARGINAL INSTABILITY
LEADING THIS FEATURE...OWING TO SFC DEWPOINTS ONLY IN THE UPPER
50S...STRONG DEEP-LAYER SHEAR /EFFECTIVE BULK SHEAR MAGNITUDES AOA
50 KT/ AND DCVA SHOULD CONTINUE SUPPORTING ITS EWD
TRANSLATION/MAINTENANCE. PRIOR TO NOCTURNAL STABILIZATION...
SUFFICIENT BUOYANCY SHOULD EXIST FOR THE SVR THREAT TO EXTEND EWD
ACROSS NERN MS...ESPECIALLY GIVEN THE SYSTEM-INDUCED COLD POOL. DMGG
WIND GUSTS WILL BE THE PRIMARY CONCERN WITH THE MCS. TO ADDRESS THIS
CONCERN...WW 21 MAY NEED TO BE EXPANDED EWD...OR...MORE LIKELY...A
NEW DOWNSTREAM SVR TSTM WATCH WILL BE NEEDED.
..COHEN.. 02/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MEG...JAN...
LAT...LON 33049037 34488991 34928925 34668826 33268844 32858902
33049037SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 1, 1:06 AM CST | Mesoscale Discussion | SPC | Adams, Amite, Franklin, Lincoln, Wilkinson | 114 min |
| Feb 1, 2:58 PM CST | Mesoscale Discussion | SPC | Benton, Bolivar, Carroll, Coahoma, DeSoto, Grenada and 12 more | 2 hr |
| Feb 1, 3:45 PM CST | Severe Thunderstorm Watch | SPC | Bolivar, Coahoma, DeSoto, Humphreys, Issaquena, Leflore and 8 more | 3 hr |
| Feb 1, 4:59 PM CST | Severe Thunderstorm Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 21 more | 4 hr |
| Feb 1, 5:18 PM CST | Mesoscale Discussion | SPC | Hancock, Pearl River | 87 min |
Nearby
Mesoscale Discussions in Mississippi, 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.