Alert archive / Louisiana / Flash Flood Warnings in 1990
Flash Flood Warning 11, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Dec 3, 1990, 2:22 AM CST for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Dec 3, 1990, 2:22 AM CST (08:22 UTC)
- Expired
- Dec 3, 1990, 5:30 AM CST
- In force
- 3 hr
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Lafourche Parish, LA, Terrebonne Parish, LA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 8.4 hours before the alert went out and 128 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.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 847 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KNEW 030837 FFWNEW LAC057-089-109-031130- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 222 AM CST MON DEC 3 1990 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 530 AM CST FOR RESIDENTS IN THE FOLLOWING PARISHES IN SOUTHEAST LOUISIANA ...NORTHERN LAFOURCHE PARISH...ST.CHARLES PARISH ...NORTHERN TERREBONNE PARISH AN AREA OF THUNDERSTORMS PRODUCING HEAVY RAIN HAS PERSISTED OVER A SMALL AREA OF SOUTHEAST LOUISIANA FROM THE HOUMA AREA NORTH ACROSS THE SCHRIEVER AND THIBADAUX AREAS INTO ST. CHARLES PARISH. PRECIPITATION ESTIMATES FROM RADAR INDICATES 3 TO 5 INCHES OF RAIN HAS LIKELY FALLEN ACROSS THIS AREA SINCE 1100 PM. THE LAFOURCHE SHERIFFS OFFICE REPORTS THAT WATER HAS ENTERED SEVERAL HOMES IN NORTHERN LAFOURCHE PARISH. AT 23O AM RADAR INDICATED THUNDERSTORMS PERSISTING OVER THE AREA WITH ADDITIONAL FLOODING OF ROADWAYS AND SOME HOMES POSSIBLE. THE AREA OF THUNDERSTORMS IS MOVING SLOWLY NORTHEAST. REMEMBER MOST FATALITIES IN FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY ESPECIALLY NEAR CANALS AND DRAINAGE DITCHES. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.
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, Dec 3, 12:55 AM CST, 1 hour 27 minutes before
LAZ010-012-013-014-030750- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 1255 PM CST MON DEC 3 1990 SCATTERED THUNDERSTORMS PRODUCING VERY HEAVY RAIN CONTINUED BETWEEN VERMILLION AND ATCHAFALAYA BAYS AND THE NEW ORLEANS AREA. THESE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR AND WILL CONTINUE TO PRODUCE PERIODS OF VERY HEAVY RAINFALL ACROSS SOUTHEAST LOUISIANA AND SOUTHEAST MISSISSIPPI. IN ADDITION THESE THUNDERSTORMS AREA CAPABLE OF PRODUCING MORE HEAVY RAINFALL...DANGEROUS LIGHTNING...STRONG GUSTY WIND...AND THE POSSIBILITY OF SMALL HAIL. MARINE INTERESTS ALONG INLAND LAKES AND COASTAL WATERS AREA ADVISED TO KEEP ALERT FOR THREATENING WEATHER. MOTORISTS IN THE METROPOLITAN NEW ORLEANS AREA ARE ADVISED TO KEEP ALERT FOR FLOODING OF STREETS AND OVERPASSES. DO NOT ATTEMPT TO DRIVE THROUGH HIGH WATER. THIS ACTIVITY WAS EMBEDDED IN A LARGE AREA OF LIGHT RAIN THAT COVERED MOST OF E\ASTERN LOUISIANA AND PORTIONS OF SOUTH MISSISSIPPI. MOVEMENT WAS NORTHEAST AT 20 MILES AN HOUR.
Special weather statement, Dec 3, 12:59 AM CST, 1 hour 23 minutes before
LAZ006-008-009-030730- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 1255 AM CST MON DEC 3 1990 ...STRONG THUNDERSTORMS MOVING ACROSS PARTS OF EAST CENTRAL LOUISIANA... RADAR SHOWED STRONG THUNDERSTORMS AND SCATTERED SHOWERS OVER MOST OF EAST CENTRAL LOUISIANA FROM SOUTH OF HOUMA...MORGAN CITY AND LAFAYETTE NORTH TO NEAR FORT POLK AND ALEXANDRIA...NATCHEZ AND MC COMB MS. THE STRONGEST STORMS WERE NEAR OPELOUSAS AND FROM MORGAN CITY TO LA PLACE. THESE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MPH. PEOPLE IN EAST CENTRAL LOUISIANA CAN EXPECT STRONG GUSTY WINDS...HEAVY RAIN WITH FLOODING OF STREETS AND OTHER LOW LYING AREAS...DANGEROUS LIGHTNING AND POSSIBLE SOME HAIL _THIS MORNING AS A STRONG COLD FRONT APPROACHES THE STATE FROM THE NORTHWEST.
Special weather statement, Dec 3, 1:06 AM CST, 1 hour 16 minutes before
LAZ010-012-013-014-030750- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...COR TO TIME NATIONAL WEATHER SERVICE NEW ORLEANS LA 1255 AM CST MON DEC 3 1990 SCATTERED THUNDERSTORMS PRODUCING VERY HEAVY RAIN CONTINUED BETWEEN VERMILLION AND ATCHAFALAYA BAYS AND THE NEW ORLEANS AREA. THESE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR AND WILL CONTINUE TO PRODUCE PERIODS OF VERY HEAVY RAINFALL ACROSS SOUTHEAST LOUISIANA AND SOUTHEAST MISSISSIPPI. IN ADDITION THESE THUNDERSTORMS AREA CAPABLE OF PRODUCING MORE HEAVY RAINFALL...DANGEROUS LIGHTNING...STRONG GUSTY WIND...AND THE POSSIBILITY OF SMALL HAIL. MARINE INTERESTS ALONG INLAND LAKES AND COASTAL WATERS AREA ADVISED TO KEEP ALERT FOR THREATENING WEATHER. MOTORISTS IN THE METROPOLITAN NEW ORLEANS AREA ARE ADVISED TO KEEP ALERT FOR FLOODING OF STREETS AND OVERPASSES. DO NOT ATTEMPT TO DRIVE THROUGH HIGH WATER. THIS ACTIVITY WAS EMBEDDED IN A LARGE AREA OF LIGHT RAIN THAT CiOVERED MOST OF EASTERN LOUISIANA AND PORTIONS OF SOUTH MISSISSIPPI. MOVEMENT WAS NORTHEAST AT 20 MILES AN HOUR.
Special weather statement, Dec 3, 1:44 AM CST, 38 minutes before
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
Local storm report, Dec 3, 2:09 AM CST, 13 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
205 AM CDT MON DEC 2 1990
1215AM CST SCHRIEVER...TERREBONE PARISH. TWO MOBILE HOMES DAMAGED BY
THUNDERSTORM WIND GUSTS. REPORT FROM TERREBONE PARISH
SHERIFFS OFFICE.Special weather statement, Dec 3, 2:21 AM CST, 1 minute before
LAZ006-008-009-030730- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 220 AM CST MON DEC 3 1990 ...STRONG THUNDERSTORMS CONTINUE MOVING ACROSS MOST OF EAST CENTRAL LOUISIANA... RADAR SHOWED AN AREA OF SHOWERS AND STRONG THUNDERSTORMS EXTENDING FROM HOUMA...MORGAN CITY AND LAFAYETTE NORTHWARD ACROSS BATON ROUGE...DENHAM SPRINGS AND OPELOUSAS CONTINUING TO NEAR ALEXANDRIA...NATCHEZ MS AND MC COMB MS. THESE THUNDERSTORMS WERE MOVING NORTHEAST NEAR 20 MPH. AS THE STRONG THUNDERSTORMS MOVE THROUGH THE AREA...THEY WILL PRODUCE STRONG GUSTY WINDS...HEAVY RAIN...DANGEROUS LIGHTNING AND POSSIBLY SOME SMALL HAIL. THE HEAVY RAIN MAY CAUSE FLOODING OF STREETS...UNDERPASSES AND OTHER LOW LYING AREAS. MOTORISTS ARE URGED TO DRIVE WITH CAUTION AND NOT DRIVE INTO FLOODED ROADWAYS. THESE THUNDERSTORMS WILL LIKELY CONTINUE THROUGH THE MORNING RUSH HOUR TRAFFIC. . THE THUNDERSTORMS ARE CAUSED BY A STRONG COLD FRONT THAT IS ENTERING NORTHWEST LOUISIANA THIS MORNING AND WILL MOVE THROUGH THE BATON ROUGE AREA SOMETIME AFTER NOON TODAY.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 3, 2:22 AM CST | Flash Flood Warning | LIX | Saint Charles | 3 hr |
| Dec 3, 4:24 AM CST | Severe Thunderstorm Warning | LIX | Orleans, Saint Tammany | 66 min |
| Dec 3, 5:18 AM CST | Severe Thunderstorm Warning | LIX | Washington | 57 min |
| Dec 3, 6:32 AM CST | Tornado Warning | LIX | Lafourche, Saint Charles | 58 min |
Nearby
Flash Flood Warnings in Louisiana, 1990Every flash flood warning in 1990
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.