Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 212
The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 12:57 PM CST for 8 counties in Alabama; 38 counties in Mississippi. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2012, 12:57 PM CST (18:57 UTC)
- Expired
- Mar 2, 2012, 2:00 PM CST
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 46 counties
Colbert County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Marion County, AL, Winston County, AL, Alcorn County, MS, 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, Humphreys County, MS, Itawamba County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS
The radar
The Columbus AFB radar (KGWX), 29 km from the middle of the area, began a volume at 18:57 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, 7.0 hours before the alert went out and 156 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
- 1625 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 645 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 291 m²/s²
- 0-3 km storm-relative helicity
- 304 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 11.9
The text
As transmitted, in the capitals the NWS used until 2016.
606
ACUS11 KWNS 021857
SWOMCD
SPC MCD 021857
ALZ000-MSZ000-022000-
MESOSCALE DISCUSSION 0212
NWS STORM PREDICTION CENTER NORMAN OK
1257 PM CST FRI MAR 02 2012
AREAS AFFECTED...NRN/CNTRL MS...NWRN AL
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 021857Z - 022000Z
THE POTENTIAL FOR TSTMS CAPABLE OF PRODUCING LARGE HAIL...DMGG
WINDS...AND ISOLATED TORNADOES APPEARS TO BE INCREASING. CONVECTIVE
TRENDS ARE BEING MONITORED FOR A POSSIBLE WW.
STRONG DIABATIC HEATING IS OCCURRING ACROSS MUCH OF MS/AL WITH
TEMPERATURES REACHING THE LOWER 80S...SUPPORTING MLCAPE VALUES NEAR
1000-1500 J/KG /PER 18Z JAN AND BMX SOUNDINGS/. RECENT RADAR TRENDS
SHOW WEAK ECHOES DEVELOPING APPROXIMATELY 35 SSE GWO ALONG A
PERSISTENT CLOUD BAND /PERHAPS COINCIDENT WITH A BROAD LOW-LEVEL
CONFLUENCE ZONE/...WHILE A WEAK WAA ADVECTION REGIME IS PRESENT
AHEAD OF AN APPROACHING CNTRL CONUS UPPER TROUGH...BUT VISIBLE
SATELLITE IMAGES SUGGEST WEAK CINH MAY STILL BE PRESENT ACROSS MOST
OF THE AREA. A SYNOPTIC-SCALE COLD FRONT STILL REMAINS POSITIONED
WELL TO THE W...BUT A GRADUAL INCREASE IN TSTM COVERAGE/INTENSITY IS
ANTICIPATED THROUGH THIS AFTERNOON IN THE PRE-FRONTAL AIR MASS.
DGX/GWX VWP DATA SHOW STRONG LOW-LEVEL WINDS VEERING WITH
HEIGHT...WITH THE ENVIRONMENT SUPPORTIVE OF ROTATING STORMS CAPABLE
OF PRODUCING LARGE HAIL...DMGG WINDS...AND ISOLATED TORNADOES.
..ROGERS.. 03/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BMX...HUN...MEG...JAN...
LAT...LON 34368692 33388809 32418968 32509069 33659082 34888975
34958785 34888706 34368692SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 9:07 AM CST | Mesoscale Discussion | SPC | DeKalb, Jackson, Lawrence, Limestone, Madison, Marshall and 1 more | 53 min |
| Mar 2, 9:25 AM CST | Tornado Watch | SPC | DeKalb, Jackson, Lawrence, Limestone, Madison, Marshall and 1 more | 5 hr |
| Mar 2, 11:46 AM CST | Mesoscale Discussion | SPC | DeKalb, Jackson, Madison, Marshall, Morgan | 29 min |
| Mar 2, 1:20 PM CST | Tornado Watch | SPC | Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 14 more | 9 hr |
| Mar 2, 2:42 PM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 18 more | 63 min |
| Mar 2, 3:25 PM CST | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more | 65 min |
| Mar 2, 4:37 PM CST | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more | 7 hr |
| Mar 2, 5:41 PM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Butler and 36 more | 2 hr |
| Mar 2, 10:28 AM CST | Mesoscale Discussion | SPC | DeSoto, Tate | 62 min |
| Mar 2, 1:26 PM CST | Mesoscale Discussion | SPC | Humphreys, Issaquena, Sharkey, Warren, Washington, Yazoo | 64 min |
| Mar 2, 1:47 PM CST | Severe Thunderstorm Watch | SPC | Adams, Bolivar, Claiborne, Franklin, Issaquena, Jefferson and 4 more | 9 hr |
| Mar 2, 3:47 PM CST | Mesoscale Discussion | SPC | Holmes, Humphreys, Issaquena, Sharkey, Warren, Washington and 1 more | 58 min |
| Mar 2, 4:47 PM CST | Tornado Watch | SPC | Attala, Choctaw, Clarke, Clay, Copiah, Covington and 23 more | 6 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.