Alert archive / Louisiana / Flash Flood Warnings in 1989
Flash Flood Warning 15, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Nov 7, 1989, 1:36 PM CST for Saint Charles Parish, Louisiana. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Nov 7, 1989, 1:36 PM CST (19:36 UTC)
- Expired
- Nov 7, 1989, 4:45 PM CST
- In force
- 3 hr
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Saint Charles 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 12:00Z, 7.6 hours before the alert went out and 74 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
- 596 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 636 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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.
In the hours before
Special weather statement, Nov 7, 7:49 AM CST, 5 hours 47 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 750 AM CST TUE NOV 7 1989 ...STRONG THUNDERSTORMS HEADED FOR THE METROPOLITAN NEW ORLEANS AREA... AT 725 AM RADAR SHOWED A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN JUST WEST OF THE NEW ORLEANS INTERNATIONAL AIRPORT SPREADING NORTHEAST OUT OVER LAKE PONTCHARTRAIN. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING PERIODS OF HEAVY RAINFALL...STRONG GUSTY WINDS ...AND DANGEROUS LIGHTNING. IN ADDITION PERIODS OF INTENSE DOWNPOURS MAY REDUCE VISIBILITY TO NEAR ZERO. THESE THUNDERSTORMS HAVE BEEN MOVING EAST NORTHEAST AT 15 MILES AN HOUR AND WILL MOVE ACROSS WESTERN PORTIONS OF THE CITY AS WELL AS ACROSS LAKE PONTCHARTRAIN AND THE CAUSEWAY BRIDGE. AS YOU ARE TRAVELING TO WORK THIS MORNING BE ALERT FOR THESE THUNDERSTORMS AND THE POTENTIAL TRAFFIC HAZARD THEY MAY CAUSE. PATCHY LIGHT RAIN AND WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED ACROSS NORTH PORTIONS OF SOUTHEAST LOUISIANA...EXTREME SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS...AS WELL AS EXTREME SOUTHWEST ALABAMA. THUNDERSTORMS PRODUCING HEAVY RAINFALL WERE OCCURRING IN A BAND STRETCHING FROM WEST OF SLIDELL EAST ONVER THE MISSISSIPPI SOUND TO JUST SOUTH OF GULFPORT...AND WEST OF THE METRO NEW ORLEANS AREA. MOVEMENT WAS EAST NORTHEAST AT 15 MILES AN HOUR.
Special weather statement, Nov 7, 8:50 AM CST, 4 hours 46 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 850 AM CST TUE NOV 7 1989 ...STRONG THUNDERSTORMS OVER THE METROPOLITAN NEW ORLEANS AREA... AT 825 AM RADAR SHOWED A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN NEAR NEW ORLEANS INTERNATIONAL AIRPORT EXTENDING EAST NEAR LAKE BORGNE. HEAVY RAINS HAVE CAUSED SOME STREET FLOODING OVER LOW LYING AREA OF NEW ORLEANS. PERSONS SHOULD BE ALERT FOR PERIODS OF INTENSE DOWNPOURS...FREQUENT LIGHTNING...AND THE POSSIBILITY OF HAIL AS THESE THUNDERSTORMS MOVE TO THE EAST NORTHEAST AT 15 MILES AN HOUR. ELSEWHERE...SHOWERS AND THUNDERSTORMS CONTINUED OVER SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI BETWEEN MC COMB AND MORGAN CITY EXTENDING EAST BETWEEN LAUREL AND GULFPORT MISSISSIPPI. MOVEMENT WAS TO THE EAST NORTHEAST AT 15 MILES AN HOUR.
Special weather statement, Nov 7, 9:46 AM CST, 3 hours 50 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE NEW ORLEANS LA 945 AM CST TUE NOV 7 1989 ...RAIN CONTINUES OVER THE METROPOLITAN NEW ORLEANS AREA... AT 925 AM RADAR SHOWED A CLUSTER OF THUNDERSTORMS WITH HEAVY RAIN BETWEEN NEW ORLEANS AND LAKE BORGNE. ALTHOUGH THE THUNDERSTORMS HAVE MOVE TO THE EAST OF THE CITY...RAIN SHOWERS ARE STILL OCCURRING OVER METROPOLITAN NEW ORLEANS AND MAY PRODUCE SOME LOW LYING STREET FLOODING AS THE STORMS MOVE TO THE EAST AT 10 MILES. ELSEWHERE...SHOWERS AND THUNDERSTORMS CONTINUED OVER SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI. MOVEMENT WAS TO THE EAST AT 10 MILES AN HOUR.
Special weather statement, Nov 7, 9:52 AM CST, 3 hours 44 minutes before
URBAN FLOOD FLOOD STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 950 AM CST TUE NOV 7 1989 ...HEAVY RAIN PELTS THE NEW ORLEANS METROPOLITAN AREA... DURING THE PAST SEVERAL HOURS STRONG THUNDERSTORMS HAVE DEVELOPED ALONG A LOW PRESSURE TROUGH LYING EAST WEST ACROSS SOUTHEAST LOUISIANA. THE THUNDERSTORMS HAVE PRODUCED HEAVY RAINFALL WITH AMOUNTS 1 TO 3 INCHES LIKELY ACROSS THE AREA. WIDESPREAD STREET FLOODING HAS BEEN REPORTED ACROSS THE METRO AREA ALONG WITH WATER ENTERING A FEW HOMES IN LOW LYING AREAS OF WEST JEFFERSON PARISH. AT LATE MORNING SATELLITE AND RADAR INDICATED THE HEAVIEST THUNDERSTORM IN ST BERNARD MOVING INTO THE MISSISSIPPI SOUND. HOWEVER ADDITIONAL THUNDERSTORMS ARE DEVELOPING JUST TO THE WEST OF METRO AREA. THESE THUNDERSTORMS SHOULD MOVE EAST ACROSS THE AREA AND PRODUCE PERIODS OF HEAVY RAIN INTO EARLY AFTERNOON. RESIDENTS SHOULD EXERCISE CAUTION IN DRIVING IN FLOOD PRONE AREAS... AND NOT ATTEMPT TO CROSS FLOODED ROADWAYS.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 7, 10:18 AM CST | Flash Flood Warning | LIX | Jefferson | 4 hr |
| Nov 7, 10:18 AM CST | Flash Flood Warning | LIX | Saint Bernard | 4 hr |
| Nov 7, 12:20 PM CST | Flash Flood Warning | LIX | Orleans, Plaquemines, Saint Bernard | 4 hr |
| Nov 7, 12:20 PM CST | Flash Flood Warning | LIX | Jefferson | 4 hr |
| Nov 7, 4:09 PM CST | Flash Flood Warning | LIX | Jefferson, Plaquemines, Saint Bernard | 2 hr |
Nearby
Flash Flood Warnings in Louisiana, 1989Every flash flood warning in 1989
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.