Alert archive / Texas / Mesoscale Discussions in 2013
Mesoscale Discussion 331
The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2013, 3:22 PM CDT for 4 counties in Oklahoma; 33 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2013, 3:22 PM CDT (20:22 UTC)
- Expired
- Mar 29, 2013, 5:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 37 counties
Beckham County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Armstrong County, TX, Baylor County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Scurry County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wheeler County, TX, Wilbarger County, TX
The radar
The Lubbock radar (KLBB), 90 km from the middle of the area, began a volume at 20:22 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 8.4 hours before the alert went out and 206 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
- 2907 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
733
ACUS11 KWNS 292022
SWOMCD
SPC MCD 292022
OKZ000-TXZ000-292245-
MESOSCALE DISCUSSION 0331
NWS STORM PREDICTION CENTER NORMAN OK
0322 PM CDT FRI MAR 29 2013
AREAS AFFECTED...PORTIONS OF THE TX PANHANDLE/SOUTH PLAINS...NWRN TX
AND SWRN OK
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 292022Z - 292245Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...WIDELY SCTD SVR TSTMS WITH LARGE HAIL AND DAMAGING WINDS
MAY DEVELOP AFTER 2030Z. A WW MAY BE NEEDED PRIOR TO 22Z.
DISCUSSION...FORCING FOR ASCENT ASSOCIATED WITH AN UPPER LEVEL
IMPULSE MOVING INTO W TX WILL OVERSPREAD A MODERATELY UNSTABLE AIR
MASS EAST OF A SHARPENING SFC DRYLINE THROUGH LATE AFTN. BY
22Z...THE DRYLINE SHOULD EXTEND SWD FROM A WEAK SFC LOW OVER THE SRN
TX PANHANDLE S/SWWD INTO THE TRANS-PECOS REGION. LATEST VISIBLE
IMAGERY SUGGESTS SOME INCREASE IN CU FIELD NEAR THE CAPROCK TO THE
SW OF CDS. CONTINUED DAYTIME HEATING AND FORCING FOR ASCENT SHOULD
REDUCE CIN SUFFICIENTLY FOR WIDELY SCTD TSTM DEVELOPMENT AFT 2030Z.
WITH STEEP MID-LEVEL LAPSE RATES /8-8.5 DEG C/KM/ AND DEEP-LAYER
SHEAR OF 35-40 KT...ENVIRONMENT WILL BE FAVORABLE FOR LARGE HAIL AND
DAMAGING WINDS. ONE OR MORE ESEWD-MOVING CLUSTERS OF STORMS MAY
EVENTUALLY DEVELOP OVER TIME INTO EARLY EVENING WITH PRIMARILY A
THREAT FOR DAMAGING WINDS.
..BUNTING/CORFIDI.. 03/29/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...SJT...LUB...AMA...MAF...
LAT...LON 31850120 31870182 32000202 32650174 33050149 33490144
34450140 34850144 35210126 35430081 35550023 35429951
34719903 33449899 32079999 31840107 31850120SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 22 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Oklahoma, 2013Every mesoscale discussion in 2013
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.