Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 1439

June 20, 200318 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2003, 8:53 PM CDT for 18 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jun 20, 2003, 8:53 PM CDT (01:53 UTC)
Expired
Jun 20, 2003, 10:00 PM CDT
In force
67 min
Issued by
the Storm Prediction Center

Counties Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Floyd County, TX, Garza County, TX, Hale County, TX, Hockley County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Randall County, TX, Swisher County, TX, Terry County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 51 km from the middle of the area, began a volume at 01:53 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, 1.9 hours before the alert went out and 167 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.

Skew-T log-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2003-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1307 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2003-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1307 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1416 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

882 
ACUS11 KWNS 210154
SWOMCD
SPC MCD 210153 
TXZ000-NMZ000-210300-

MESOSCALE DISCUSSION 1439
NWS STORM PREDICTION CENTER NORMAN OK
0853 PM CDT FRI JUN 20 2003

AREAS AFFECTED...SRN TX PANHANDLE AND TX SOUTH PLAINS

CONCERNING...TORNADO WATCH 552...

VALID 210153Z - 210300Z

ISOLATED SUPERCELLS WILL CONTINUE TO POSE A THREAT FOR LARGE HAIL
AND DAMAGING WINDS THROUGH WW EXPIRATION TIME. DESPITE INTENSIFYING
LOW LEVEL JET...INCREASING BOUNDARY LAYER INHIBITION WILL LIKELY
LIMIT THE TORNADO THREAT OVER THE REMAINDER VALID PORTIONS OF WW 552
THROUGH EXPIRATION TIME.

CLUSTER OF STRONG-SEVERE THUNDERSTORMS IN THE TX SOUTH PLAINS...WILL
CONTINUE TO MOVE EWD AROUND 20 KTS. BOUNDARY LAYER COOLING WILL
INCREASE CONVECTIVE INHIBITION OVER THE REGION DURING THE NEXT
SEVERAL HOURS. HOWEVER...INCREASING 34-40 KT SSELY LOW LEVEL JET
SHOULD AID IN SUSTAINED ELEVATED CONVERGENCE INTO CONVECTIVE CLUSTER
SUPPORTING AN MCS OVER THE SRN TX PANHANDLE/TX SOUTH PLAINS BEYOND
WW 552 EXPIRATION TIME. HOWEVER... WEAKENING MID/UPPER LEVEL WINDS
TO THE EAST OF WW 552 SHOULD LIMIT THE OVERALL INTENSITY OF
CONVECTION AND THE NEED FOR AN ADDITIONAL WW EAST OF WW 552.

..CROSBIE.. 06/21/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LUB...AMA...MAF...ABQ...

33000306 34000305 35250177 35490115 32990120 32990299

Nearby

Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.