Alert archive / Texas / Mesoscale Discussions in 2016
Mesoscale Discussion 7
The Storm Prediction Center issued this mesoscale discussion at Jan 8, 2016, 6:31 PM CST for 13 parishes in Louisiana; 28 counties in Texas. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jan 8, 2016, 6:31 PM CST (00:31 UTC)
- Expired
- Jan 8, 2016, 8:30 PM CST
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 41 counties
Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Jefferson Davis Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Angelina County, TX, Brazoria County, TX, Chambers County, TX, Cherokee County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX
The radar
The Lake Charles radar (KLCH), 66 km from the middle of the area, began a volume at 00:31 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 nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.5 hours before the alert went out and 68 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
- 1021 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 665 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 7.8
The text
As transmitted.
761
ACUS11 KWNS 090031
SWOMCD
SPC MCD 090031
LAZ000-TXZ000-090230-
MESOSCALE DISCUSSION 0007
NWS STORM PREDICTION CENTER NORMAN OK
0631 PM CST FRI JAN 08 2016
AREAS AFFECTED...SERN TX INTO SWRN LA
CONCERNING...SEVERE THUNDERSTORM WATCH 1...
VALID 090031Z - 090230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 1 CONTINUES.
SUMMARY...THE THREAT FOR LARGE DAMAGING HAIL WILL PERSIST WELL INTO
THE EVENING ACROSS THE WATCH AREA.
DISCUSSION...A RASH OF SEVERE HAIL STORMS HAS ERUPTED ACROSS MUCH OF
SERN TX IN A REGION OF WARM AIR ADVECTION MAINLY ABOVE A SLIGHTLY
MORE STABLE SFC LAYER...AND AHEAD OF AN APPROACHING SHORTWAVE
TROUGH. 00Z SOUNDINGS INDICATE VERY COLD AIR ALOFT FOR THIS
LATITUDE...WHICH IS COMPENSATING FOR THE RELATIVELY LOWER MOISTURE
CONTENT WITH MAINLY UPPER 50S TO LOWER 60S F DEWPOINTS. SEVERAL OF
THESE STORMS ARE SUPERCELLS WITH AT LEAST MIDLEVEL ROTATION NOTED ON
RADAR.
WHILE THE HAIL THREAT WILL PERSIST AND GRADUALLY SHIFT NEWD WITH
TIME...THERE MAY ALSO BE A LOCALIZED TORNADO THREAT...ALTHOUGH
CONDITIONAL. THIS WOULD BE CLOSER TO COASTAL AREAS WHERE HIGHER
DEWPOINTS OF 63-66 F EXIST. MODELS SUGGEST LITTLE NWD ADVANCEMENT OF
SAID DEWPOINTS...SUGGESTING ANY SFC-BASED ROTATION MAY BE RELEGATED
TO NEAR-COASTAL COUNTIES. SRN PORTIONS OF THE WATCH COULD BE
UPGRADED TO TORNADO IF SFC OBSERVATIONS AND STORM TRENDS REQUIRE.
..JEWELL.. 01/09/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...SHV...HGX...FWD...
LAT...LON 28759474 29139580 31359609 32219485 32639397 32579340
32149312 31359279 30459233 29889215 29389230 28779315
28689382 28759474SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 |
| Jan 9, 5:28 AM CST | Mesoscale Discussion | SPC | Jefferson, Lafourche, Plaquemines | 62 min |
| Jan 9, 1:17 AM CST | Mesoscale Discussion | SPC | Brazos, Burleson, Grimes, Hardin, Jasper, Liberty and 7 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2016Mesoscale 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; radar from the NEXRAD Level II archive.