Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 16, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Apr 15, 2021, 12:10 AM CDT for Saint Tammany Parish, Louisiana. It was in force for 2 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 15, 2021, 12:10 AM CDT (05:10 UTC)
- Expired
- Apr 15, 2021, 2:34 AM CDT
- In force
- 2 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
County Saint Tammany Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 15, 12:19 AM CDT | FLASH FLOOD | Mandeville, LA | SOCIAL MEDIA REPORT OF A HOME TAKING IN WATER IN OLD MANDEVILLE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 5.2 hours before the alert went out and 37 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
- 5 J/kg
- Mixed-layer CIN
- -620 J/kg
- Mixed-layer LCL
- 709 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 311 m²/s²
- 0-3 km storm-relative helicity
- 272 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
479
WGUS54 KLIX 150510
FFWLIX
LAC103-150800-
/O.NEW.KLIX.FF.W.0016.210415T0510Z-210415T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1210 AM CDT Thu Apr 15 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
West Central St. Tammany Parish in southeastern Louisiana...
* Until 300 AM CDT.
* At 1210 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2.5 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Mandeville and Lacombe.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3038 9014 3043 9010 3041 9000 3033 8995
3031 9000 3032 9002 3032 9004 3035 9005
3036 9009 3037 9013
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.75-2 INCHES IN 1 HOUR
$$
CAB2 follow-up statements
072
WGUS74 KLIX 150613
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
113 AM CDT Thu Apr 15 2021
LAC103-150800-
/O.CON.KLIX.FF.W.0016.000000T0000Z-210415T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-
113 AM CDT Thu Apr 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 AM CDT EARLY THIS
MORNING FOR WEST CENTRAL ST. TAMMANY PARISH...
At 113 AM CDT, the public reported thunderstorms producing heavy
rain across the warned area. Between 3 and 5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Mandeville and Lacombe.
Additional rainfall amounts of 0.5 to 1.5 inches are possible in the
warned area.
Reports have come in that water was beginning to enter a residence
in Old Mandeville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3038 9014 3043 9010 3041 9000 3033 8995
3031 9000 3032 9002 3032 9004 3035 9005
3036 9009 3037 9013
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1.5-3.5 INCHES IN 2 HOURS
$$
CAB648
WGUS74 KLIX 150734
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
234 AM CDT Thu Apr 15 2021
LAC103-150744-
/O.CAN.KLIX.FF.W.0016.000000T0000Z-210415T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-
234 AM CDT Thu Apr 15 2021
...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL ST. TAMMANY
PARISH...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1200 PM CDT Thursday for
portions of southeast Louisiana and southern Mississippi.
LAT...LON 3038 9014 3043 9010 3041 9000 3033 8995
3031 9000 3032 9002 3032 9004 3035 9005
3036 9009 3037 9013
$$
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 7:57 PM CDT | Special Weather Statement | LIX | Plaquemines | 63 min |
| Apr 14, 8:00 PM CDT | Special Marine Warning | LIX | 2 hr | |
| Apr 14, 8:22 PM CDT | Special Marine Warning | LIX | 113 min | |
| Apr 14, 9:12 PM CDT | River Flood Warning | LIX | East Baton Rouge | 72 hr |
| Apr 14, 9:18 PM CDT | River Flood Warning | LIX | Saint Helena | 62 hr |
| Apr 14, 9:18 PM CDT | River Flood Warning | LIX | Saint Helena | 70 hr |
| Apr 14, 9:18 PM CDT | River Flood Warning | LIX | Livingston | 4 days |
| Apr 14, 9:36 PM CDT | Special Marine Warning | LIX | 84 min | |
| Apr 14, 11:04 PM CDT | Areal Flood Advisory | LIX | Orleans, Saint Tammany | 3 hr |
| Apr 14, 11:06 PM CDT | Special Marine Warning | LIX | 84 min | |
| Apr 14, 11:22 PM CDT | Special Weather Statement | LIX | Tangipahoa | 53 min |
| Apr 14, 11:36 PM CDT | Areal Flood Advisory | LIX | Saint Tammany, Tangipahoa | 3 hr |
| Apr 15, 12:15 AM CDT | Special Marine Warning | LIX | 60 min | |
| Apr 15, 12:24 AM CDT | Special Weather Statement | LIX | Saint Tammany | 81 min |
| Apr 15, 12:33 AM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 57 min |
| Apr 15, 12:49 AM CDT | Flash Flood Warning | LIX | Saint Tammany | 106 min |
| Apr 15, 1:03 AM CDT | Special Marine Warning | LIX | 87 min | |
| Apr 15, 1:07 AM CDT | Special Marine Warning | LIX | 98 min | |
| Apr 15, 1:38 AM CDT | Special Marine Warning | LIX | 97 min | |
| Apr 15, 2:01 AM CDT | Special Weather Statement | LIX | Saint Helena | 44 min |
| Apr 15, 2:03 AM CDT | Special Weather Statement | LIX | Washington | 57 min |
| Apr 15, 2:27 AM CDT | Special Marine Warning | LIX | 33 min | |
| Apr 15, 2:38 AM CDT | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa, Washington | 27 min |
| Apr 15, 3:23 AM CDT | Special Marine Warning | LIX | 22 min | |
| Apr 15, 3:50 AM CDT | Special Marine Warning | LIX | 55 min | |
| Apr 15, 4:06 AM CDT | Small Craft Advisory | LIX | 12 hr | |
| Apr 15, 4:36 AM CDT | Severe Thunderstorm Warning | LIX | East Feliciana | 24 min |
| Apr 15, 4:46 AM CDT | Special Marine Warning | LIX | 44 min | |
| Apr 15, 4:58 AM CDT | Special Weather Statement | LIX | Saint Helena | 47 min |
| Apr 15, 5:03 AM CDT | Special Weather Statement | LIX | Pointe Coupee | 42 min |
| Apr 15, 5:59 AM CDT | Special Weather Statement | LIX | Ascension, Livingston, Saint James | 31 min |
| Apr 15, 6:11 AM CDT | Special Weather Statement | LIX | Washington | 34 min |
| Apr 15, 6:16 AM CDT | Special Marine Warning | LIX | 59 min | |
| Apr 15, 6:22 AM CDT | Special Weather Statement | LIX | Assumption | 53 min |
| Apr 15, 6:28 AM CDT | Severe Thunderstorm Warning | LIX | Ascension, Saint Charles, Saint James, Saint John the Baptist | 18 min |
| Apr 15, 6:38 AM CDT | River Flood Warning | LIX | Washington | 3 days |
| Apr 15, 7:01 AM CDT | Special Weather Statement | LIX | Orleans, Saint Charles | 44 min |
| Apr 15, 7:10 AM CDT | Special Marine Warning | LIX | 65 min | |
| Apr 15, 7:40 AM CDT | Special Weather Statement | LIX | Terrebonne | 50 min |
| Apr 15, 7:45 AM CDT | Special Weather Statement | LIX | Orleans | 30 min |
| Apr 15, 7:57 AM CDT | Special Marine Warning | LIX | 63 min | |
| Apr 15, 8:01 AM CDT | Special Marine Warning | LIX | 29 min | |
| Apr 15, 8:04 AM CDT | Special Marine Warning | LIX | 56 min | |
| Apr 15, 8:16 AM CDT | Special Weather Statement | LIX | Jefferson, Plaquemines | 89 min |
| Apr 15, 8:40 AM CDT | Special Marine Warning | LIX | 95 min | |
| Apr 15, 8:57 AM CDT | Special Marine Warning | LIX | 63 min | |
| Apr 15, 9:58 AM CDT | Special Marine Warning | LIX | 92 min | |
| Apr 15, 10:04 AM CDT | River Flood Warning | LIX | Ascension, Livingston | 21 days |
| Apr 15, 10:04 AM CDT | River Flood Warning | LIX | Ascension, Livingston | 5 days |
| Apr 15, 10:14 AM CDT | River Flood Warning | LIX | Tangipahoa | 27 hr |
| Apr 15, 11:15 AM CDT | Special Weather Statement | LIX | Lafourche | 60 min |
| Apr 15, 11:16 AM CDT | River Flood Warning | LIX | Tangipahoa | 21 hr |
| Apr 15, 11:21 AM CDT | Special Marine Warning | LIX | 54 min | |
| Apr 15, 11:49 AM CDT | Special Marine Warning | LIX | 42 min | |
| Apr 15, 12:39 PM CDT | Special Marine Warning | LIX | 66 min | |
| Apr 15, 12:46 PM CDT | Special Marine Warning | LIX | 59 min | |
| Apr 15, 1:38 PM CDT | Special Marine Warning | LIX | 67 min | |
| Apr 15, 1:41 PM CDT | Special Marine Warning | LIX | 12 min | |
| Apr 15, 2:40 PM CDT | Special Marine Warning | LIX | 45 min |
Nearby
Flash Flood Warnings in Louisiana, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.