Alert archive / Louisiana / Mesoscale Discussions in 2007
Mesoscale Discussion 985
The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2007, 3:13 PM CDT for 38 parishes in Louisiana; 13 counties in Mississippi. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Jun 3, 2007, 3:13 PM CDT (20:13 UTC)
- Expired
- Jun 3, 2007, 4:15 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 51 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Franklin County, MS, Hancock County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Walthall 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.2 hours before the alert went out and 180 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
- 1497 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 623 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 032013 SWOMCD SPC MCD 032013 LAZ000-MSZ000-032115- MESOSCALE DISCUSSION 0985 NWS STORM PREDICTION CENTER NORMAN OK 0313 PM CDT SUN JUN 03 2007 AREAS AFFECTED...CNTRL/SRN LA...SWRN MS CONCERNING...SEVERE THUNDERSTORM WATCH 337... VALID 032013Z - 032115Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 337 CONTINUES. LONG-LIVED LINEAR/TRAILING STRATIFORM MCS WITH A HISTORY OF WIND DAMAGE ACROSS ERN TX/WRN LA WILL CONTINUE TO MARCH E/SEWD THROUGH THE ERN HALF OF WW 337 OVER THE NEXT FEW HOURS. IF OVERALL INTENSITY APPEARS TO BE MAINTAINED...A DOWNSTREAM WW WILL LIKELY BE ISSUED ACROSS ERN LA/SWRN MS WITHIN THE HOUR. AS OF 2005Z...THE LEADING EDGE OF THE LINEAR MCS WAS ROUGHLY FROM 40 W MLU SWD TO ESF ARCING SWWD TO NEAR LCH. OVERALL RADAR REFLECTIVITY TRENDS HAVE SHOWN A DOWNWARD/INCREASINGLY DISORGANIZED TREND OVER THE PAST HOUR...WITH CORRESPONDING WARMING OF CONVECTIVE CLOUD TOPS ON IR IMAGERY. THIS APPEARS TO CORRELATE WITH THE LINE MOVING E OF THE RICHEST LOW-LEVEL THETA-E AXIS. STILL...WITH TEMPERATURES IN THE UPPER 80S AND DEW POINTS IN THE MID TO UPPER 60S AHEAD OF THE LINE...CONVECTIVE INTENSITY MAY BE ABLE TO MAINTAIN ITSELF IN POSSIBLY MORE DISORGANIZED LINE SEGMENTS. DAMAGING WINDS WILL LIKELY REMAIN THE MAIN THREAT. ..GRAMS.. 06/03/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...JAN...LIX...LCH...SHV... 32089178 32019087 31518997 30828951 29748939 29238999 29399133 29649254 29979342 30469344 31379289 31999247
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 3, 11:47 AM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, De Soto, Grant, Jefferson Davis and 4 more | 58 min |
| Jun 3, 12:22 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Bossier, Caddo and 19 more | 6 hr |
| Jun 3, 3:35 PM CDT | Severe Thunderstorm Watch | SPC | Ascension, Assumption, Catahoula, Concordia, East Baton Rouge, East Feliciana and 11 more | 3 hr |
| Jun 3, 5:48 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 41 more | 87 min |
Nearby
Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Mississippi, 2007Every mesoscale discussion in 2007
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.