Alert archive / Louisiana / Flash Flood Warnings in 2021

Flash Flood Warning 63, NWS New Orleans, LA

June 25, 2021Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jun 25, 2021, 1:44 PM CDT for Saint Tammany Parish, Louisiana. It was in force for 2 hr. 3 reports 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: Jun 25, 2021, 1:44 PM CDT (18:44 UTC)
Expired: Jun 25, 2021, 3:45 PM 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
Jun 25, 1:50 PM CDT	FLASH FLOOD	2 Sse Slidell, LA	WATER OVER ROADS IN OLD TOWNE SLIDELL, LA.
Jun 25, 2:00 PM CDT	FLASH FLOOD	1 Wnw Slidell, LA	LAW ENFORCEMENT REPORTS SOME HOMES TAKING ON WATER NEAR SULLIVAN AND WEST HALL STREETS IN SLIDELL, LA.
Jun 25, 2:00 PM CDT	FLASH FLOOD	2 Wnw Slidell, LA	FLOODING IN FORESTWOOD SUBDIVISION WEST OF CARROLL ROAD IN SLIDELL, LA.

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 12:00Z, 6.7 hours before the alert went out and 9 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: 2193 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 583 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: -13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

700 
WGUS54 KLIX 251844
FFWLIX
LAC103-252045-
/O.NEW.KLIX.FF.W.0063.210625T1844Z-210625T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
144 PM CDT Fri Jun 25 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 PM CDT.

* At 144 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Slidell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3023 8983 3024 8984 3029 8983 3030 8980
      3031 8975 3030 8974 3026 8976 3022 8978
      3022 8980

FLASH FLOOD...RADAR INDICATED

$$

DM

1 follow-up statement

290 
WGUS74 KLIX 252047
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
347 PM CDT Fri Jun 25 2021

LAC103-252057-
/O.EXP.KLIX.FF.W.0063.000000T0000Z-210625T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Tammany LA-
347 PM CDT Fri Jun 25 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTH CENTRAL ST. TAMMANY 
PARISH...

The heavy rain has ended and flood waters have receded in most 
places. Please continue to heed any remaining road closures.

LAT...LON 3023 8983 3024 8984 3029 8983 3030 8980
      3031 8975 3030 8974 3026 8976 3022 8978
      3022 8980

$$

DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 5:22 AM CDT	Special Marine Warning	LIX		83 min
Jun 25, 7:13 AM CDT	Special Marine Warning	LIX		2 hr
Jun 25, 9:11 AM CDT	Special Marine Warning	LIX		64 min
Jun 25, 12:23 PM CDT	Special Weather Statement	LIX	Saint Tammany	52 min
Jun 25, 12:42 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	2 hr
Jun 25, 1:54 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, Livingston	70 min
Jun 25, 2:15 PM CDT	Areal Flood Advisory	LIX	Washington	2 hr
Jun 25, 2:24 PM CDT	Areal Flood Advisory	LIX	Terrebonne	111 min
Jun 25, 2:42 PM CDT	Areal Flood Advisory	LIX	East Feliciana	111 min
Jun 25, 2:58 PM CDT	Areal Flood Advisory	LIX	Saint Charles, Saint John the Baptist	104 min
Jun 25, 3:32 PM CDT	Areal Flood Advisory	LIX	East Feliciana	72 min

Nearby

Flash Flood Warnings in Louisiana, 2021 Every 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.