Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 18, NWS Shreveport, LA

June 7, 2001Nacogdoches County, San Augustine County, Texas

NWS Shreveport, LA issued this flash flood warning at Jun 7, 2001, 6:03 PM CDT for Nacogdoches County, San Augustine County, Texas. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jun 7, 2001, 6:03 PM CDT (23:03 UTC)
Expired: Jun 7, 2001, 10:00 PM CDT
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Nacogdoches County, TX, San Augustine County, TX

The radar

The Shreveport radar (KSHV), 118 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 125 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 564 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 503 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSHV 072306
FFWSHV
TXC347-405-080300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
603 PM CDT THU JUN 7 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NACOGDOCHES COUNTY IN EASTERN TEXAS
  SAN AUGUSTINE COUNTY IN EASTERN TEXAS

* UNTIL 1000 PM CDT

* AT 603 PM CDT...THE SHREVEPORT WEATHER SERVICE DOPPLER RADAR   
INDICATED VERY HEAVY RAIN OVER NACOGDOCHES AND SAN AUGUSTINE 
COUNTIES. THUNDERSTORMS CONTINUED TO DEVELOP AND SPREAD NORTH AT 20 
MPH ACROSS THE AREA PRODUCING RAINFALL AMOUNTS OF ONE TO TWO INCHES 
PER HOUR ON ALREADY SATURATED SOILS PROVIDING RAPID WATER RUNOFF.

THESE THUNDERSTORMS WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND 
STREAMS...URBAN HIGHWAYS AND UNDERPASSES...ALONG WITH RURAL COUNTRY 
ROADS...AND LOW FARMLAND.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
IT ONLY TAKES ABOUT A FOOT OF WATER TO WASH AN AUTOMOBILE FROM 
THE ROADWAY.
 
REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD
WARNING FOR...
  NACOGDOCHES COUNTY IN EASTERN TEXAS
  SAN AUGUSTINE COUNTY IN EASTERN TEXAS
UNTIL 1000 PM CDT.

LAT...LON 3119 9416 3152 9402 3165 9435 3177 9459
          3177 9494 3155 9483

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 Shreveport, LA wrote its last area forecast discussion before this flash flood warning went out at Jun 7, 3:10 PM CDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jun 7, 3:10 PM CDT, 2 hours 53 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
310 PM CDT THU JUN 7 2001

ALLI IS MOVING SWWD AS PROMISED...AS UPPER RIDGE OVER SOUTHERN
ROCKIES HAS A FIRM GRASP ON IT AND IS TAKING IT CLOCKWISE. WORST
WEATHER IN THE NEAR TERM MAY BE SOUTHERN TEXAS...WELL OUT OF OUR
AREA...AS PER LATEST SWOMCD. HIGH PRESSURE/S INFLUENCE WILL INCREASE
AND THE RAIN CHANCES WILL END BY THE END OF THE WEEK...THEN LAWN
MOWERS WILL NEARLY CHOKE AS THEY FEAST UPON THE PLENTIFUL ALBEIT
SOGGY BOUNTY.

GASP...WHAT TO DO ABOUT THE FLASH FLOOD WATCH. WILL MONITOR
SATELLITE AND RADAR UP TO ZONE ISSUANCE TIME...BUT CIRCULATION
CENTER AT SURFACE AND 500 MB OVER E TX HAS PRODUCED RELATIVELY
LITTLE CONVECTION THUS FAR. TEMPERATURES STRUGGLING TO REACH
80...BUT BREAKS IN THE CLOUDS TRYING TO DEVELOP OVER THE WATCH AREA
MAY INDUCE FRESH DEVELOPMENT. CONTRARYWISE...POSITIVE VORTICITY
ADVECTION FIELDS DID SHOW A LOBE ACROSS COASTAL LA TODAY...AND THE
LINE OF STORMS BATTLED BY LCH AND NEW TODAY VERIFY THAT. BUT THAT/S
ALL...NVA IS PROGGED TO REMAIN OVER OUR CWA THROUGH THE NIGHT...AND
SURFACE WIND CONVERGENCE ALONG SOUTHERN TIER OF CWA WILL WEAKEN /E
TO NE WINDS NORTH...SE WINDS SOUTH/. FOR CONSISTENCY SAKE I WILL
KEEP POPS IN THE 50-60 PERCENT RANGE WITHIN THE CURRENT WATCH
AREA...AND MAY PLACE AN OBLIGATORY MENTION OF SOME LOCALLY HEAVY
DOWN SOUTH...BUT FOCUS WORDING MAINLY DURING THE EVENING.

HENCE WILL NOT EXTEND THE FLASH FLOOD WATCH FOR THE HUGE AREA...
ALTHOUGH BEAR IN MIND THAT A WARNING COULD ALWAYS BE ISSUED IF HEAVY
RAIN SHOWERS DEVELOP OVER AN ALREADY HARD HIT SPOT.

MINOR TWEAKS OF THE EXTENDED BUT IN GENERAL NO RAIN MENTIONED TIL
DAYS 6 AND 7. 17

PRELIMS...

SHV 72/84/70/86/70 5532
MLU 72/84/70/86/70 5532
TXK 70/83/70/88/68 4321
TYR 72/83/70/86/70 6542
LFK 72/83/72/86/70 6653

.SHV...NONE.

Nearby

Flash Flood Warnings in Texas, 2001 Every flash flood warning in 2001

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.