Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 103
The Storm Prediction Center issued this mesoscale discussion at Feb 16, 2021, 6:59 PM CST for 13 counties in Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 16, 2021, 6:59 PM CST (00:59 UTC)
- Expired
- Feb 16, 2021, 11:00 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Heavy snow
Counties Armstrong County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hall County, TX, Potter County, TX, Randall County, TX, Swisher County, TX
The radar
The Amarillo radar (KAMA), 67 km from the middle of the area, began a volume at 00:59 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 1.0 hours before the alert went out and 66 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
- 5 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 424 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 194 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
085
ACUS11 KWNS 170100
SWOMCD
SPC MCD 170059
TXZ000-OKZ000-170500-
Mesoscale Discussion 0103
NWS Storm Prediction Center Norman OK
0659 PM CST Tue Feb 16 2021
Areas affected...Portions of the Texas Panhandle
Concerning...Heavy snow
Valid 170059Z - 170500Z
SUMMARY...Pockets of heavy snow are possible with a slowly
southward-moving band now along the I-40 corridor. This band may
persist another 4-6 hours.
DISCUSSION...A narrow band of heavy snow has set up roughly oriented
along the I-40 corridor. Heavy snow has been observed in Amarillo
over the last 45 minutes. This band appears to be related to 850 mb
warm advection. As 850 mb wind veer this evening, this band will
slowly shift southward along with the strongest warm advection. A
few areas of heavy snow are possible as this bands move south. There
is some uncertainty with the duration of the band, but some guidance
suggests it may persist another 4-6 hours.
..Wendt.. 02/17/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...LUB...AMA...
LAT...LON 35420034 34760004 34499991 34150029 34040122 34100204
34290220 34550233 34800236 35430237 35580170 35420034SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 16, 8:14 PM CST | Mesoscale Discussion | SPC | Archer, Clay, Cooke, Grayson, Jack, Montague and 2 more | 4 hr |
| Feb 16, 9:41 PM CST | Mesoscale Discussion | SPC | Bell, Brazos, Burleson, Burnet, Falls, Lampasas and 5 more | 4 hr |
| Feb 17, 1:55 AM CST | Mesoscale Discussion | SPC | Angelina, Austin, Bastrop, Brazos, Burleson, Colorado and 31 more | 6 hr |
| Feb 17, 7:38 AM CST | Mesoscale Discussion | SPC | Jasper, Newton, Sabine | 4 hr |
| Feb 17, 9:15 AM CST | Mesoscale Discussion | SPC | Bowie, Cass | 6 hr |
Nearby
Mesoscale Discussions in Texas, 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.