Alert archive / Louisiana / Flash Flood Warnings in 2003

Flash Flood Warning 22, NWS Shreveport, LA

June 17, 2003Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Jun 17, 2003, 3:42 PM CDT for Natchitoches Parish, Louisiana. 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 outline as issued.

The facts

Issued: Jun 17, 2003, 3:42 PM CDT (20:42 UTC)
Expired: Jun 17, 2003, 6:45 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Natchitoches Parish, LA

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.7 hours before the alert went out and 98 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: 1199 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 37 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 172043
FFWSHV
LAC069-172345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
342 PM CDT TUE JUN 17 2003

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NATCHITOCHES PARISH IN NORTHWEST LOUISIANA

* UNTIL 645 PM CDT

* AT 342 PM CDT...THE SHREVEPORT WEATHER SERVICE DOPPLER RADAR
  INDICATED VERY HEAVY RAIN OVER NATCHITOCHES...AND NEAR 
  CAMPTI...MOVING NORTHEAST AT 20 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
  NATCHITOCHES AND CAMPTI THROUGH 5 PM CDT

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOTORISTS ON INTERSTATE 49 SHOULD REDUCE DRIVING SPEEDS AND 
AVOID HIGH WATER.
 
REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD
WARNING FOR...
  NATCHITOCHES PARISH IN NORTHWEST LOUISIANA
UNTIL 645 PM CDT.

LAT...LON 3142 9311 3185 9334 3189 9323 3195 9320
          3195 9312 3200 9314 3213 9299 3172 9298
          3149 9289

$$

03

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 17, 3:12 PM CDT, 30 minutes earlier.

Area forecast discussion, Jun 17, 3:12 PM CDT, 30 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
312 PM CDT TUE JUN 17 2003

UPPER LOW STILL OVER E TX...MY THIS SOUNDS FAMILIAR.  HOWEVER...
MODELS ARE INDICATING THAT CHANGES ARE A BREWING.  ETA/AVN ARE
BEGINNING TO AGREE SOMEWHAT BEGINNING TO MOVE THE UPPER LOW.
HOWEVER...TOMORROW IS ANOTHER DAY.  FOR TONIGHT...WILL GO WITH FLASH
FLOOD WATCH FOR S OF A LINE FROM ELD...ALL OF N LA...AND I20
CORRIDOR AND S...INCLUDING WOOD...UPSHUR...AND MARION COUNTIES IN E
TX.  THANKS FOR COORD JAN/LCH.  ACTIVITY IS INCREASING OVER THE
AREA...WITH MODELS INDICATING A 2ND ROUND OF ACTIVITY AS WELL AFTER
MIDNIGHT.  WITH THE AMOUNT OF RAINFALL THAT THE AREA HAS HAD AS OF
LATE...IN ADDITION TO WHAT IS EXPECTED TONIGHT...NOT MUCH MORE CAN
BE TOLERATED BEFORE THE USUAL PLACES BEGIN ACCUMULATING WATER.

FOR TOMORROW...SHOULD SEE THE LOW BEGINNING TO MOVE ENE THEN E.
AFTER THIS TAKES PLACE...WE WILL BEGIN TO SEE SOME RELIEF.
HOWEVER...WITH LESS LIKELY RAIN CHANCES RETURNS THE WARMER
TEMPERATURES THAT COME ALONG WITH IT.  WILL RETURN TO MORE SEASONAL
READINGS AND RAIN CHANCES AFTER LOW MOVES OUT.

20

SHV 068/083 070/088 069 5633
MLU 073/086 072/087 069 5633
TXK 068/082 069/087 068 5632
TYR 068/082 068/089 069 5532
LFK 069/086 070/090 069 5533

.SHV...NONE.

Hazardous weather outlook, Jun 17, 12:00 PM CDT, 3 hours 42 minutes before

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-181100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT TUE JUN 17 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST OKLAHOMA...NORTHEAST
TEXAS...SOUTHWEST ARKANSAS...NORTHWEST AND NORTH CENTRAL LOUISIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT...
AN UPPER LEVEL LOW WILL CONTINUE TO SPIN OVER EAST TEXAS THIS
AFTERNOON...AS THE GULF OF MEXICO CONTINUES TO SUPPLY THE AREA WITH
ABUNDANT MOISTURE. DAYTIME HEATING...AND WEAK DISTURBANCES ROTATING
AROUND THIS LOW...WILL ALLOW SCATTERED SHOWERS AND THUNDERSTORMS TO
MOVE ACROSS MUCH OF THE AREA THIS AFTERNOON AND EVENING.  SEVERE
WEATHER SHOULD BE AT A MINIMUM WITH THESE STORMS...HOWEVER HEAVY
RAIN WILL LEAD TO LOCALIZED FLOODING IN SOME AREAS.  IF SEVERE
WEATHER OCCURS...IT WILL BE THIS AFTERNOON...AS HEATING WILL HELP TO
DESTABILIZE THE ATMOSPHERE.  DAMAGING WINDS WILL BE THE PRIMARY
SEVERE WEATHER THREAT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...
SCATTERED SHOWERS AND THUNDERSTORMS WILL LINGER ACROSS MUCH OF THE
AREA THROUGH WEDNESDAY...AS THE UPPER LEVEL LOW AND ASSOCIATED
STATIONARY FRONTAL BOUNDARY REMAIN IN PLACE OVER THE AREA.
THUS...LOCALIZED FLOODING WILL BE THE PRIMARY THREAT AS THE GROUND
OVER MUCH OVER THE REGION IS NEAR SATURATION.

.SPOTTER CALL TO ACTION STATEMENT...
DUE TO THE ISOLATED AND BRIEF NATURE OF ANY SEVERE WEATHER...
ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS...SHOULD NOT BE NEEDED THIS AFTERNOON AND TONIGHT.

20

In the hours before

Local storm report, Jun 17, 3:30 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT, LA
330 PM CDT TUE JUN 17 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0325 PM    FARMERVILLE               LA   FLASH FLOODS
06/17/03   UNION                          SEVERAL STREETS FLOODED IN
                                          FARMERVILLE. SOME STREETS
                                          BARRICADED. REPORTED BY LAW
                                          ENFORCEMENT

03

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 2:53 PM CDT	Flash Flood Warning	SHV	Union	3 hr
Jun 17, 4:21 PM CDT	Flash Flood Warning	SHV	Jackson	3 hr
Jun 17, 4:52 PM CDT	Flash Flood Warning	SHV	Ouachita	3 hr

Nearby

Flash Flood Warnings in Louisiana, 2003 Every flash flood warning in 2003

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.