Alert archive / Louisiana / Mesoscale Discussions in 2016
Mesoscale Discussion 11
The Storm Prediction Center issued this mesoscale discussion at Jan 9, 2016, 5:28 AM CST for Jefferson Parish, Lafourche Parish, Plaquemines Parish, Louisiana. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Jan 9, 2016, 5:28 AM CST (11:28 UTC)
- Expired
- Jan 9, 2016, 6:30 AM CST
- In force
- 62 min
- Issued by
- the Storm Prediction Center
Counties Jefferson Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 11.5 hours before the alert went out and 129 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
462
ACUS11 KWNS 091129
SWOMCD
SPC MCD 091128
LAZ000-091230-
MESOSCALE DISCUSSION 0011
NWS STORM PREDICTION CENTER NORMAN OK
0528 AM CST SAT JAN 09 2016
AREAS AFFECTED...SOUTHEAST LOUISIANA
CONCERNING...SEVERE THUNDERSTORM WATCH 2...
VALID 091128Z - 091230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 2 CONTINUES.
SUMMARY...A LIMITED SEVERE WEATHER THREAT ACROSS THE REMAINING VALID
PORTION OF SEVERE TSTM WATCH 2 IN SOUTHEAST LA AND EAST ACROSS FAR
SOUTHEAST LA /THROUGH PLAQUEMINES PARISH/ SUGGESTS THIS WATCH SHOULD
EXPIRE AT 12Z.
DISCUSSION...TRENDS IN EARLY MORNING SURFACE OBSERVATIONS INDICATED
THE WARM FRONT HAS REMAINED OFFSHORE TERREBONNE AND LAFOURCHE
PARISHES...WHILE CONTINUING TO EXTEND THROUGH SOUTHEAST PLAQUEMINES
PARISH /NEAR OR MORE LIKELY SOUTHEAST OF KBVE/. MOSAIC RADAR
IMAGERY INDICATED AN EXTENSIVE AREA OF PRECIPITATION HAS SPREAD
ACROSS MUCH OF SOUTHEAST LA...AHEAD OF THE PRIMARY BAND OF
TSTMS...WHICH AT 1115Z EXTENDED FROM ST. CHARLES TO TERREBONNE
PARISHES AND INTO THE NORTHWEST GULF OF MEXICO. A COUPLE OF STORMS
OFFSHORE NEAR AND AHEAD OF THE PRIMARY BAND...AND AT LEAST ONE STORM
INLAND HAVE HAD ROTATION...THOUGH THE OFFSHORE STORMS HAVE THE
GREATEST TORNADO POTENTIAL...SINCE THE INLAND STORMS ARE ELEVATED.
THE EXTENSIVE AREA OF PRECIPITATION WILL CONTINUE TO SPREAD ACROSS
SOUTHEAST LA THIS MORNING...PRECEDING THE RELATIVELY STRONGER
STORMS...AND SHOULD LIMIT DESTABILIZATION. THIS FACTOR AND THE
SMALL AREAL COVERAGE REMAINING FOR ANY ADDITIONAL SEVERE-WEATHER
THREAT APPEARS TO PRECLUDE THE NEED FOR ADDITIONAL WATCHES IN
SOUTHEAST LA.
..PETERS.. 01/09/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LIX...
LAT...LON 28719127 29539063 29729020 29678969 29548912 29088901
28848918 28748969 28689017 28719127SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 8, 6:31 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Caddo, Calcasieu, Cameron and 7 more | 119 min |
| Jan 8, 9:52 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 13 more | 83 min |
| Jan 8, 10:44 PM CST | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more | 7 hr |
| Jan 9, 2:52 AM CST | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Cameron, East Baton Rouge, Evangeline and 15 more | 113 min |
Nearby
Mesoscale Discussions in Louisiana, 2016Every mesoscale discussion in 2016
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.