Alert archive / Texas / Mesoscale Discussions in 2021
Mesoscale Discussion 840
The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2021, 4:56 PM CDT for 24 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 2, 2021, 4:56 PM CDT (21:56 UTC)
- Expired
- Jun 2, 2021, 7:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 24 counties
Austin County, TX, Bastrop County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Fayette County, TX, Grimes County, TX, Harris County, TX, Lampasas County, TX, Lee County, TX, Liberty County, TX, Llano County, TX, Milam County, TX, Mills County, TX, Montgomery County, TX, Robertson County, TX, San Jacinto County, TX, San Saba County, TX, Travis County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 45 km from the middle of the area, began a volume at 21:57 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
Fort Worth, TX (KFWD), launched 12:00Z, 9.9 hours before the alert went out and 265 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
- 914 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
407
ACUS11 KWNS 022157
SWOMCD
SPC MCD 022156
TXZ000-030030-
Mesoscale Discussion 0840
NWS Storm Prediction Center Norman OK
0456 PM CDT Wed Jun 02 2021
Areas affected...central and southeast Texas
Concerning...Severe potential...Watch unlikely
Valid 022156Z - 030030Z
Probability of Watch Issuance...20 percent
SUMMARY...Storms may increase in coverage along a front from the
Austin area toward Houston. Isolated strong wind gusts or marginal
hail cannot be ruled out.
DISCUSSION...Moderate instability with 2000-2500 J/kg MLCAPE has
developed along and south of a stalled front extending from central
into southeast Texas this afternoon. Winds in the low levels are
weak, but increasing winds aloft in the mid to high levels may
support a few southeastward-moving clusters as storms develop near
the front. Other storms ongoing near San Angelo may also persist
southeastward near the boundary, with marginal wind or hail threat.
Currently, it appears expected severe coverage downstream of watch
233 may not warrant a new watch, but one could be needed should
storms become better organized with any substantial wind threat.
..Jewell/Thompson.. 06/02/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...HGX...FWD...EWX...SJT...
LAT...LON 29769699 30199814 30589890 30929921 31259927 31459904
31549851 31079639 30639493 30299468 29879477 29599507
29539548 29769699SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 7:24 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Cochran, Crosby, Dawson, Floyd and 11 more | 96 min |
| Jun 2, 6:14 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Fisher, Haskell, Jones, Knox and 5 more | 2 hr |
| Jun 2, 1:28 PM CDT | Mesoscale Discussion | SPC | Andrews, Coke, Concho, Dawson, Ector, Gaines and 11 more | 2 hr |
| Jun 2, 2:50 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Borden, Coke, Concho, Crockett, Dawson and 19 more | 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.