Alert archive / Louisiana / Flash Flood Warnings in 2021
Flash Flood Warning 17, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Apr 15, 2021, 12:49 AM CDT for Saint Tammany Parish, Louisiana. It was in force for 106 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2021, 12:49 AM CDT (05:49 UTC)
- Expired
- Apr 15, 2021, 2:35 AM CDT
- In force
- 106 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
County Saint Tammany Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 5.8 hours before the alert went out and 15 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.
699
WGUS54 KLIX 150549
FFWLIX
LAC103-150845-
/O.NEW.KLIX.FF.W.0017.210415T0549Z-210415T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
1249 AM CDT Thu Apr 15 2021
The National Weather Service in New Orleans has issued a
* Flash Flood Warning for...
South Central St. Tammany Parish in southeastern Louisiana...
* Until 345 AM CDT.
* At 1249 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 2 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...
Slidell, Pearl River, Lacombe and Slidell Airport.
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 8986 3036 8972 3017 8971 3017 8972
3018 8974 3018 8975 3019 8976 3021 8980
3023 8985 3025 8987 3026 8990 3025 8993
3026 8996 3026 8997 3027 8999 3029 8999
3031 9000 3036 8989
FLASH FLOOD...RADAR INDICATED
$$
CAB2 follow-up statements
453
WGUS74 KLIX 150628
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
128 AM CDT Thu Apr 15 2021
LAC103-150845-
/O.CON.KLIX.FF.W.0017.000000T0000Z-210415T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-
128 AM CDT Thu Apr 15 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 AM CDT EARLY THIS
MORNING FOR SOUTH CENTRAL ST. TAMMANY PARISH...
At 128 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1.5 and 4 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Slidell, Pearl River, Lacombe and Slidell Airport.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3038 8986 3036 8972 3017 8971 3017 8972
3018 8974 3018 8975 3019 8976 3021 8980
3023 8985 3025 8987 3026 8990 3025 8993
3026 8996 3026 8997 3027 8999 3029 8999
3031 9000 3036 8989
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-3 INCHES IN 3 HOURS
$$
CAB701
WGUS74 KLIX 150735
FFSLIX
Flash Flood Statement
National Weather Service New Orleans LA
235 AM CDT Thu Apr 15 2021
LAC103-150745-
/O.CAN.KLIX.FF.W.0017.000000T0000Z-210415T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-
235 AM CDT Thu Apr 15 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH 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 8986 3036 8972 3017 8971 3017 8972
3018 8974 3018 8975 3019 8976 3021 8980
3023 8985 3025 8987 3026 8990 3025 8993
3026 8996 3026 8997 3027 8999 3029 8999
3031 9000 3036 8989
$$
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, 12:10 AM CDT | Flash Flood Warning | LIX | Saint Tammany | 2 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, 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; the sounding from the Mesonet's radiosonde archive.