Alert archive / Mississippi / Mesoscale Discussions in 2003
Mesoscale Discussion 1349
The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2003, 8:51 AM CDT for Washington County, Alabama; 11 parishes in Louisiana; 23 counties in Mississippi. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2003, 8:51 AM CDT (13:51 UTC)
- Expired
- Jun 12, 2003, 10:15 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 35 counties
Washington County, AL, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 1.9 hours before the alert went out and 102 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
- 1553 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 852 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
356 ACUS11 KWNS 121351 SWOMCD SPC MCD 121351 ALZ000-MSZ000-LAZ000-121515- MESOSCALE DISCUSSION 1349 NWS STORM PREDICTION CENTER NORMAN OK 0851 AM CDT THU JUN 12 2003 AREAS AFFECTED...SERN LA...SRN MS...SWRN AL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 121351Z - 121515Z ...WW MAY BE REQUIRED ACROSS PORTIONS OF THE CENTRAL GULF COAST IF ONGOING ACTIVITY INTENSIFIES... REMNANTS OF OVERNIGHT COMPLEX OF STORMS IS PROGRESSING STEADILY EWD ACROSS ERN PORTIONS OF LA...ROUGHLY 30KT...WITH SOMEWHAT FASTER MOVEMENT...35KT...OBSERVED WITH MORE ARCED SHAPED SEGMENTS ALONG THE LINE. OF PARTICULAR INTEREST IS THE LARGE-SCALE OUTFLOW THAT HAS SAGGED SWD ACROSS CENTRAL MS INTO AL AHEAD OF THIS ACTIVITY. THIS MAY PROVIDE ADDITIONAL FOCUS FOR FUTURE DEVELOPMENT AHEAD OF ORGANIZED LINE. IN ADDITION...12Z SOUNDINGS INDICATE WEAK WARM ADVECTION AS A BACKGROUND ENVIRONMENT WHICH SUPPORTS DEVELOPMENT WELL AHEAD OF THE WIND SHIFT GIVEN MARGINAL INHIBITION. ..DARROW.. 06/12/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MOB...JAN...LIX...LCH... 31769159 31878867 31338779 30508843 30269006 30459190
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:50 PM CDT | Severe Thunderstorm Watch | SPC | Bibb, Chilton, Coosa, Fayette, Greene, Hale and 10 more | 5 hr |
| Jun 11, 9:18 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Fayette, Greene, Hale, Jefferson and 6 more | 87 min |
| Jun 12, 9:10 AM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 5 hr |
| Jun 12, 11:10 AM CDT | Mesoscale Discussion | SPC | Choctaw, Clarke, Mobile, Washington | 95 min |
| Jun 12, 1:15 PM CDT | Mesoscale Discussion | SPC | Clarke, Mobile, Washington | 60 min |
| Jun 12, 1:34 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Chambers, Chilton, Clay and 19 more | 86 min |
| Jun 12, 12:30 AM CDT | Mesoscale Discussion | SPC | Bossier, Caddo, De Soto | 2 hr |
| Jun 12, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | Bossier, Caddo, De Soto | 4 hr |
| Jun 12, 4:20 AM CDT | Mesoscale Discussion | SPC | Bossier, Caddo, De Soto | 55 min |
| Jun 12, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Saint Helena, Saint Tammany, Tangipahoa and 2 more | 4 hr |
| Jun 11, 7:14 PM CDT | Mesoscale Discussion | SPC | Bolivar, Calhoun, Chickasaw, Clay, Coahoma, Grenada and 8 more | 2 hr |
Nearby
Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Louisiana, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003
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.