Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 882
The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2021, 10:11 AM CDT for Bossier Parish, Caddo Parish, Louisiana; 6 counties in Texas. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 2021, 10:11 AM CDT (15:11 UTC)
- Expired
- Jun 8, 2021, 11:15 AM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Bossier Parish, LA, Caddo Parish, LA, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Panola County, TX, Rusk County, TX
The radar
The Shreveport radar (KSHV), 53 km from the middle of the area, began a volume at 15:13 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
Shreveport, LA (KSHV), launched 12:00Z, 3.2 hours before the alert went out and 62 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
- 1621 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
The text
As transmitted.
876
ACUS11 KWNS 081511
SWOMCD
SPC MCD 081511
LAZ000-TXZ000-081615-
Mesoscale Discussion 0882
NWS Storm Prediction Center Norman OK
1011 AM CDT Tue Jun 08 2021
Areas affected...northeast TX...northwest LA
Concerning...Severe potential...Watch unlikely
Valid 081511Z - 081615Z
Probability of Watch Issuance...20 percent
SUMMARY...The airmass over northeast TX and northwest LA will
continue to slowly destabilize this morning ahead of an approaching
squall line. An isolated risk for damaging gusts may eventually
materialize this afternoon across northern LA.
DISCUSSION...Radar mosaic at 10am CDT shows a squall line moving
east across northeast TX. During the past hour, measured gusts have
at ASOS sites have remained below 25 kt. However, gradual heating
and associated destabilization is expected to occur across adjacent
portions of northeast TX into northern LA later this morning into
the early afternoon. The Shreveport, LA 88D VAD data shows flow in
the 30-35 kt range in the 1-3 km AGL layer. This enhanced belt of
flow coupled with the possibility for squall line intensification
towards midday may result in the threat for wind damage to increase
mainly for portions of northern LA. Will monitor convective trends
in the short term for signs of storm intensification and the
possibility for a watch later today. An upgrade to 15-percent wind
probabilities and a categorical Slight Risk is anticipated for
portions of northern LA for the upcoming 1630z Day 1 outlook.
..Smith/Guyer.. 06/08/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SHV...
LAT...LON 32609511 33049430 32929363 32299347 31869398 31639525
32609511SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 11:17 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more | 118 min |
| Jun 8, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Caldwell, Claiborne, East Carroll, Franklin, Jackson and 11 more | 6 hr |
| Jun 8, 2:47 PM CDT | Mesoscale Discussion | SPC | Caldwell, East Carroll, Franklin, Madison, Richland, West Carroll | 118 min |
| Jun 7, 7:03 PM CDT | Mesoscale Discussion | SPC | Bailey, Borden, Castro, Cochran, Crosby, Dawson and 16 more | 2 hr |
| Jun 7, 9:04 PM CDT | Severe Thunderstorm Watch | SPC | Briscoe, Castro, Childress, Cottle, Crosby, Dickens and 7 more | 5 hr |
| Jun 7, 10:28 PM CDT | Mesoscale Discussion | SPC | Briscoe, Castro, Cottle, Crosby, Dickens, Floyd and 10 more | 92 min |
| Jun 8, 1:11 AM CDT | Mesoscale Discussion | SPC | Baylor, Fisher, Haskell, Jones, Kent, King and 6 more | 2 hr |
| Jun 8, 4:53 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Comal, Gillespie, Hays and 9 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2021Mesoscale Discussions in Louisiana, 2021Every mesoscale discussion in 2021
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.