Alert archive / Texas / Flash Flood Warnings in 1999

Flash Flood Warning 20, NWS Houston/Galveston, TX

June 25, 1999Trinity County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 25, 1999, 9:00 AM CDT for Trinity County, Texas. It was in force for 2 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
Jun 25, 1999, 9:00 AM CDT (14:00 UTC)
Expired
Jun 25, 1999, 11:00 AM CDT
In force
2 hr
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Trinity County, TX

The radar

The Houston radar (KHGX), 180 km from the middle of the area, began a volume at 14:01 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

Shreveport, LA (KSHV), launched 12:00Z, 2.0 hours before the alert went out and 203 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, Shreveport, LA at 12:00Z on 1999-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 357 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, Shreveport, LA at 12:00Z on 1999-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
357 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1116 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 25, 8:29 AM CDTFlash Flood WarningHGXPolk2 hr
Jun 25, 9:14 AM CDTFlash Flood WarningHGXAustin, Washington2 hr
Jun 25, 10:10 AM CDTFlash Flood WarningHGXSan Jacinto110 min
Jun 25, 10:25 AM CDTFlash Flood WarningHGXPolk, Trinity3 hr
Jun 25, 12:26 PM CDTFlash Flood WarningHGXChambers, Galveston, Harris2 hr
Jun 25, 2:30 PM CDTFlash Flood WarningHGXChambers, Galveston2 hr
Jun 25, 3:10 PM CDTFlash Flood WarningHGXPolk, San Jacinto3 hr
Jun 25, 4:44 PM CDTFlash Flood WarningHGXWalker2 hr
Jun 25, 6:15 PM CDTFlash Flood WarningHGXPolk, San Jacinto2 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.