Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 66, NWS Houston/Galveston, TX

July 7, 1997Trinity County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jul 7, 1997, 9:16 PM CDT for Trinity 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
Jul 7, 1997, 9:16 PM CDT (02:16 UTC)
Expired
Jul 8, 1997, 12:15 AM CDT
In force
3 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 02:18 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 00:00Z, 2.3 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 00:00Z on 1997-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2485 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 00:00Z on 1997-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 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
2485 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
715 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
116 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.

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.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Jul 7, 7:54 PM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jul 7, 7:54 PM CDT, 1 hour 22 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
750 PM CDT MON JUL 7 1997

STANDARD DIURNAL CHGS TO FCST REQUESTED... DROP POPS FOR INLAND ZONES
AND DO SOME REWORDING FOR COAST...

LATE FORMING SEABREEZE CONVECTION NOW ALONG BRENHAM TO LIBERTY LINE
SHOULD DISSIPATE SOON AFTER SS.  SAME GOES FOR TSTMS BETWEEN
LIVINGSTON AND CROCKETT WHICH HAVE FIRED ON AN INTERSECTION OF TWO
OLD OUTFLOW BOUNDARIES.  DO NOT EXPECT ANY REDEVELOPMENT OF PCPN
PRIOR TO SR EXCEPT POSSIBLY ALONG COAST.  AS FOR THE CASE OF PCPN
ALONG THE COAST...  EXPECT THIS TO BE SPONSORED BY AREA OF DEEP
TROPICAL MOISTURE MOVING UP FROM W GULF OF MEXICO.  MODELS HAVE
INTRIGUING MISH-MASH OF PCPN FCST NEXT 24 HRS... AND ALTHOUGH NOT ALL
OF IT ASSOCTD WITH THIS TROPICAL "SYSTEM" (IF SOMETHING THIS
DISORGANIZED CAN BE CALLED THAT)... I DON'T LIKE ANY OF THEM.  I
SUSPECT THAT PCPN WILL ACTUALLY HAVE THE KIND OF LOGICAL DEVELOPMENT
THAT WOULD BE INSINUATED BY JUST EXTRAPOLATING WHAT CAN BE SEEN OVER
THE PAST 12 HOURS OR SO ON SATELLITE...  SPREADING GRADUALLY NEWD
FROM THE COASTAL BEND AREA DURG THE MORNING HOURS TMRW.  THIS ALSO
AGREES WITH ANTICIPATED FLOW CHANGES AS WK 5H TROF AXIS OVR EXTREME
SE TX PULLS FURTHER EWD AND A DEEP SOUTHERLY FLOW SETS IN FOR A
WHILE.  FOR TONIGHT... WOULD DROP POPS/HEAVY RAIN FOR INLAND ZONES
AND CHG WORDING TO "EVENING SHOWERS ENDING... BECOMING MOSTLY
FAIR".  FOR COAST...  WOULD KEEP 30 PCT POP BUT REWORD TO "SHOWERS OR
THUNDERSTOMRS TOWARDS MORNING", AND ALSO DROP MENTION OF LOCALLY
HEAVY RAIN.  FOR TUE... CURRENT FCST COVERS ANTICIPATED POTENTIAL FOR
RAIN WITH POPS WELL ABV GUIDANCE.

38

In the hours before

Special weather statement, Jul 7, 3:23 PM CDT, 5 hours 53 minutes before
TXZ176>179-195>200-210>214-226-227-080200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
315 PM CDT MON JUL 7 1997

THE THREAT OF SEVERE WEATHER FOR A LARGE PART OF SOUTHEAST TEXAS
FOR TONIGHT HAS DIMINISHED.

A WEAK MID TO UPPER LEVEL DISTURBANCE WILL MOVE SLOWLY ACROSS
NORTHEAST TEXAS AND NORTHERN LOUSIANA LATE THIS AFTERNOON AND
TONIGHT.  THIS DISTURBANCE HAS BEEN TRIGGERING THE DEVELOPMENT OF
SHOWERS AND THUNDERSTORMS OVER THE EXTREME EASTERN PORTIONS OF
SOUTHEAST TEXAS.

SINCE MOST OF THE ENERGY FROM THE UPPER LEVEL DISTURBANCE WILL REMAIN
TO NORTH AND NORTHEAST OF OUR REGION TONIGHT...STRONG THUNDERSTORM
DEVELOPMENT IS NOT EXPECTED TO BE FAVORABLE OVER OUR REGION.

HOWEVER...THUNDERSTORMS THAT MAY DEVELOP ALONG AND NEAR OUTFLOW
BOUNDARIES TO THE NORTHEAST AND EAST OF OUR REGION DURING THE LATE
AFTERNOON AND EARLY EVENING HOURS...WILL LIKELY PRODUCE LOCALLY HEAVY
RAIN. THESE STORMS MAY AFFECT THE EASTERN PORTIONS OF SOUTHEAST
TEXAS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 8:46 PM CDTSevere Thunderstorm WarningHGXTrinity44 min

Nearby

Flash Flood Warnings in Texas, 1997Every flash flood warning in 1997

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.