Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 161
The Storm Prediction Center issued this mesoscale discussion at Feb 27, 2011, 10:54 PM CST for 30 counties in Texas. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Feb 27, 2011, 10:54 PM CST (04:54 UTC)
- Expired
- Feb 28, 2011, 12:30 AM CST
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 30 counties
Anderson County, TX, Bell County, TX, Bosque County, TX, Cherokee County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Smith County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 108 km from the middle of the area, began a volume at 04:55 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 00:00Z, 4.9 hours before the alert went out and 131 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
- 765 J/kg
- Mixed-layer CIN
- -189 J/kg
- Mixed-layer LCL
- 1244 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 242 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
374
ACUS11 KWNS 280455
SWOMCD
SPC MCD 280454
TXZ000-280630-
MESOSCALE DISCUSSION 0161
NWS STORM PREDICTION CENTER NORMAN OK
1054 PM CST SUN FEB 27 2011
AREAS AFFECTED...HILL COUNTRY INTO NCNTRL/NERN TX
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 280454Z - 280630Z
SRN EDGE OF AT LEAST 30 METER H5 HEIGHT FALLS SKIRTING ACROSS CNTRL
TX LATE THIS EVENING HAS BEEN SUFFICIENT TO WEAKEN INHIBITION FOR
DEVELOPMENT OF TSTMS. HOWEVER...PARCELS APPEAR TO REQUIRE THE
ENHANCED LIFT OF THE DRYLINE/FRONT AND BASES MAY BE SLIGHTLY
ELEVATED. THIS WOULD CONTRIBUTE TO MAINLY A MRGLY SVR HAIL THREAT
IF THE STORMS REMAIN POST-FRONTAL. HOWEVER...GIVEN THAT 70 KTS OF
WLY MID-LEVEL FLOW WAS TRANSLATING ACROSS TX...ANY STORM THAT CAN
MAINTAIN AN APPRECIABLE PCPN CORE ALONG/AHEAD OF THE FRONT COULD
QUICKLY ORGANIZE INTO A DMGG WIND THREAT AND WILL HAVE TO BE CLOSELY
MONITORED. OTHERWISE...PRIMARY LARGE SCALE SUPPORT WILL PASS N OF
THE RED RIVER AND INTO AR OVERNIGHT WHERE THE MAJORITY OF SVR
WEATHER IS EXPECTED.
..RACY.. 02/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...HGX...FWD...EWX...
LAT...LON 31189827 33249677 33269516 32639484 31909506 31259588
30749705 30899807 31189827SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 8:07 PM CST | Mesoscale Discussion | SPC | Bowie, Camp, Delta, Fannin, Franklin, Grayson and 5 more | 53 min |
| Feb 27, 10:04 PM CST | Tornado Watch | SPC | Bowie, Fannin, Grayson, Lamar, Red River | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.