Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 220, NWS Lubbock, TX

July 20, 2015Castro County, Texas

NWS Lubbock, TX issued this severe thunderstorm warning at Jul 20, 2015, 4:12 PM CDT for Castro County, Texas. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 20, 2015, 4:12 PM CDT (21:12 UTC)
Expired
Jul 20, 2015, 4:30 PM CDT
In force
18 min
Issued by
NWS Lubbock, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Castro County, TX

The radar

The Amarillo radar (KAMA), 93 km from the middle of the area, began a volume at 21:15 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 12:00Z, 9.2 hours before the alert went out and 93 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 12:00Z on 2015-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 761 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2015-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939Sfc1 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
761 J/kg
Mixed-layer CIN
-196 J/kg
Mixed-layer LCL
1533 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lubbock, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 3:44 PM CDT, 28 minutes earlier.

Area forecast discussion, Jul 20, 3:44 PM CDT, 28 minutes before
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Hazardous weather outlook, Jul 20, 3:39 PM CDT, 33 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LUBBOCK TX
339 PM CDT MON JUL 20 2015

TXZ021>044-212045-
PARMER-CASTRO-SWISHER-BRISCOE-HALL-CHILDRESS-BAILEY-LAMB-HALE-
FLOYD-MOTLEY-COTTLE-COCHRAN-HOCKLEY-LUBBOCK-CROSBY-DICKENS-KING-
YOAKUM-TERRY-LYNN-GARZA-KENT-STONEWALL-
339 PM CDT MON JUL 20 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE EXTREME SOUTHERN TEXAS
PANHANDLE...SOUTH PLAINS AND ROLLING PLAINS.

.DAY ONE...THIS AFTERNOON AND TONIGHT
A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING
ACROSS NORTHERN AND WESTERN PORTIONS OF THE SOUTH PLAINS AND THE
FAR SOUTHERN TEXAS PANHANDLE. DAMAGING WIND GUSTS UP TO 65 MPH
WILL BE THE GREATEST THREAT WITH HAIL EXPECTED TO BE SMALLER THAN
ONE INCH IN DIAMETER. THE SLOW MOVING STORMS WILL ALSO BE CAPABLE
OF HEAVY RAINFALL WHICH MAY RESULT IN LOCALIZED FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
THUNDERSTORMS WILL BE POSSIBLE TUESDAY THROUGH WEDNESDAY MORNING.
ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY AFTERNOON.
OTHERWISE...HAZARDOUS WEATHER IS NOT EXPECTED FOR WEDNESDAY
THROUGH SUNDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

In the hours before

Special weather statement, Jul 20, 3:55 PM CDT, 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LUBBOCK TX
355 PM CDT MON JUL 20 2015

TXZ021>023-027>029-202145-
LAMB TX-BAILEY TX-CASTRO TX-SWISHER TX-HALE TX-PARMER TX-
355 PM CDT MON JUL 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR SWISHER...PARMER...CASTRO...
LAMB...BAILEY AND NORTHERN HALE COUNTIES UNTIL 445 PM CDT...

AT 353 PM CDT...DOPPLER RADAR WAS TRACKING A CLUSTER OF STRONG
THUNDERSTORMS ACROSS THE FAR SOUTHWEST TEXAS PANHANDLE AND
NORTHWEST SOUTH PLAINS. THESE STORMS WERE NEARLY STATIONARY.

THESE STORMS ARE PRODUCING VERY HEAVY RAINFALL AND MOVING VERY
SLOWLY...WHICH WILL RESULT IN THE POTENTIAL FOR MINOR FLOODING OF
ROADS...CREEKS AND LOW LYING AREAS. HALF INCH HAIL...WIND GUSTS UP
TO 50 MPH...AND FREQUENT CLOUD TO GROUND LIGHTNING ARE ALSO POSSIBLE
WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
PLAINVIEW...MULESHOE...TULIA...DIMMITT...FRIONA...OLTON...BOVINA...
FARWELL...HART...EARTH...SUDAN...AMHERST...KRESS...HAPPY...
NEEDMORE...BLACK...MULESHOE WILDLIFE REFUGE...OKLAHOMA LANE...LARIAT
AND CLAYTONVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3475 10149 3415 10157 3383 10305 3463 10304
      3475 10223
TIME...MOT...LOC 2053Z 195DEG 3KT 3457 10229

The office that day

Everything else NWS Lubbock, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 3:55 PM CDTSpecial Weather StatementLUBBailey, Castro, Lamb, Parmer, Swisher50 min
Jul 20, 6:34 PM CDTAreal Flood AdvisoryLUBBriscoe, Hall86 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015

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.