Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 5, NWS Lubbock, TX

April 30, 1999Yoakum County, Texas

NWS Lubbock, TX issued this flash flood warning at Apr 30, 1999, 5:43 PM CDT for Yoakum County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 30, 1999, 5:43 PM CDT (22:43 UTC)
Expired
Apr 30, 1999, 9:00 PM CDT
In force
3 hr
Issued by
NWS Lubbock, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Yoakum County, TX

The radar

The Lubbock radar (KLBB), 108 km from the middle of the area, began a volume at 22:42 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

Midland Regional, TX (KMAF), launched 12:00Z, 10.7 hours before the alert went out and 148 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, Midland Regional, TX at 12:00Z on 1999-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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, Midland Regional, TX at 12:00Z on 1999-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 216 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
21 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
1062 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
216 m²/s²
0-3 km storm-relative helicity
296 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

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

In the hours before

Special weather statement, Apr 30, 11:45 AM CDT, 5 hours 58 minutes before
TXZ021>044-302000-

AREA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE LUBBOCK TX
1145 AM CDT FRI APR 30 1999

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS MAINLY OVER THE
WESTERN SOUTH PLAINS THIS AFTERNOON AND TONIGHT.

A MOIST SOUTHEAST LOW LEVEL FLOW WILL CONTINUE OVER THE AREA TODAY
AS AN UPPER LEVEL LOW PRESSURE SYSTEM REMAINS OVER THE DESERT
SOUTHWEST.  THUNDERSTORMS WILL DEVELOP AND MOVE NORTHWARD ACROSS THE
WESTERN SOUTH PLAINS THIS AFTERNOON AND TONIGHT.  A FEW STORMS WILL
HAVE THE POTENTIAL TO PRODUCE LARGE HAIL.  IN ADDITION LOCALLY HEAVY
RAINFALL CAN BE EXPECTED.

SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS AFTERNOON AND EVENING
FOR AREAS GENERALLY WEST OF A SPRINGLAKE TO BROWNFIELD LINE.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 4:42 PM CDTTornado WarningLUBYoakum33 min
Apr 30, 5:27 PM CDTSevere Thunderstorm WarningLUBYoakum48 min
Apr 30, 6:07 PM CDTTornado WarningLUBYoakum33 min
Apr 30, 6:23 PM CDTFlash Flood WarningLUBCastro4 hr
Apr 30, 6:40 PM CDTTornado WarningLUBYoakum30 min
Apr 30, 6:48 PM CDTFlash Flood WarningLUBCochran, Lamb4 hr

Nearby

Flash Flood Warnings in Texas, 1999Every flash flood warning in 1999

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.