Alert archive / Texas / Mesoscale Discussions in 2016
Mesoscale Discussion 979
The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2016, 3:20 PM CDT for 4 parishes in Louisiana; 19 counties in Texas. It was in force for 25 min.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2016, 3:20 PM CDT (20:20 UTC)
- Expired
- Jun 18, 2016, 3:45 PM CDT
- In force
- 25 min
- Issued by
- the Storm Prediction Center
All 23 counties
Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Hardin County, TX, Harrison County, TX, Jasper County, TX, Jefferson 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, Shelby County, TX, Smith County, TX, Tyler County, TX, Upshur County, TX
The radar
The Ft Polk radar (KPOE), 99 km from the middle of the area, began a volume at 20:24 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 12:00Z, 8.3 hours before the alert went out and 130 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
- 2313 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 781 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
784
ACUS11 KWNS 182021
SWOMCD
SPC MCD 182020
LAZ000-TXZ000-182045-
MESOSCALE DISCUSSION 0979
NWS STORM PREDICTION CENTER NORMAN OK
0320 PM CDT SAT JUN 18 2016
AREAS AFFECTED...SWRN LA / E TX
CONCERNING...SEVERE THUNDERSTORM WATCH 270...
VALID 182020Z - 182045Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 270
CONTINUES.
SUMMARY...THE ISOLATED THREAT FOR DAMAGING STRAIGHT-LINE WINDS WILL
CONTINUE OWING TO GUSTS GENERALLY IN THE 45-60 MPH RANGE.
DISCUSSION...RADAR MOSAIC SHOWS A WELL-DEVELOPED ARCING GUST
FRONT/OUTFLOW FROM A WEAKLY ORGANIZED MCS MOVING WWD ACROSS THE
SABINE RIVER VALLEY. A 42-KT GUST WAS OBSERVED AT KDTN IN NWRN LA
AROUND 19Z. THE BOUNDARY LAYER DOWNSTREAM OVER E TX IS STRONGLY
UNSTABLE /2500 J PER KG MLCAPE/ PER THE 18Z LCH RAOB WITH TEMPS IN
THE LOWER 90S AND DEWPOINTS IN THE LOWER 70S. THE 18Z LCH RAOB
FEATURED A LOWEST 100 MB MEAN MIXING RATIO AROUND 17 G/KG AND PW OF
1.7 INCHES. THIS MOIST AIRMASS IS CO-LOCATED WITH RELATIVELY STEEP
0-3 KM LAPSE RATES /8-9 DEG C PER KM/ AND WILL PROBABLY SUPPORT
POCKETS OF STRONG TO LOW-END SEVERE GUSTS CAPABLE OF LOCALIZED WIND
DAMAGE FOR THE NEXT SEVERAL HOURS.
..SMITH.. 06/18/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...SHV...HGX...FWD...
LAT...LON 29719428 31689550 32749524 32769396 31839411 30939349
30509253 29699273 29719428SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 11:31 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, De Soto and 11 more | 89 min |
| Jun 18, 1:16 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Beauregard, Bossier, Caddo, Calcasieu and 11 more | 6 hr |
| Jun 18, 3:14 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Foard, Hardeman, Montague and 2 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.