Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 118, NWS New Orleans, LA

September 15, 2021Hancock County, Pearl River County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Sep 15, 2021, 7:04 AM CDT for Hancock County, Pearl River County, Mississippi. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 15, 2021, 7:04 AM CDT (12:04 UTC)
Expired
Sep 15, 2021, 10:00 AM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Hancock County, MS, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.1 hours before the alert went out and 25 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2021-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 84 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2021-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
84 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
695 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
285 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

040 
WGUS54 KLIX 151204
FFWLIX
MSC045-109-151500-
/O.NEW.KLIX.FF.W.0118.210915T1204Z-210915T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
704 AM CDT Wed Sep 15 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Hancock County in southern Mississippi...
  Southwestern Pearl River County in southern Mississippi...

* Until 1000 AM CDT.

* At 704 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. Additional rainfall amounts of 2 to 4 inches are possible in 
  the warned area. 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...
  Picayune, Bay St. Louis, Waveland, Diamondhead, Stennis Space 
  Center, Kiln, Mcneil, Shoreline Park, Pearlington and Crossroads.

This includes the following Interstates...
	Interstate 59 in Mississippi between mile markers 1 and 18.
	Interstate 10 in Mississippi between mile markers 3 and 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3087 8976 3051 8934 3037 8934 3037 8935
      3034 8938 3034 8934 3032 8932 3025 8942
      3023 8942 3021 8945 3018 8946 3019 8947
      3020 8955 3021 8958 3040 8965 3047 8969
      3057 8979 3069 8981 3078 8980

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

TE
1 follow-up statement
020 
WGUS74 KLIX 151453
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
953 AM CDT Wed Sep 15 2021

MSC045-109-151503-
/O.EXP.KLIX.FF.W.0118.000000T0000Z-210915T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hancock MS-Pearl River MS-
953 AM CDT Wed Sep 15 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 10 AM CDT THIS MORNING FOR 
HANCOCK AND SOUTHWESTERN PEARL RIVER COUNTIES...

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 700 AM CDT Thursday for 
portions of southeast Louisiana and Mississippi.

LAT...LON 3087 8976 3051 8934 3037 8934 3037 8935
      3034 8938 3034 8934 3032 8932 3025 8942
      3023 8942 3021 8945 3018 8946 3019 8947
      3020 8955 3021 8958 3040 8965 3047 8969
      3057 8979 3069 8981 3078 8980

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 15, 6:19 AM CDTAreal Flood AdvisoryLIXHancock, Harrison, Pearl River45 min
Sep 15, 6:22 AM CDTTornado WarningLIXHancock, Pearl River23 min
Sep 15, 7:45 AM CDTFlash Flood WarningLIXHancock, Harrison, Jackson, Pearl River3 hr
Sep 15, 8:11 AM CDTFlash Flood Warning Considerable damage threatLIXHarrison5 hr
Sep 15, 8:22 AM CDTFlash Flood WarningLIXJackson6 hr
Sep 15, 8:37 AM CDTRiver Flood WarningLIXPike37 hr
Sep 15, 8:52 AM CDTRiver Flood WarningLIXHancock28 hr
Sep 15, 8:52 AM CDTRiver Flood WarningLIXHarrison43 hr
Sep 15, 9:02 AM CDTRiver Flood WarningLIXPike, Walthall46 hr
Sep 15, 9:08 AM CDTRiver Flood WarningLIXHancock, Pearl River5 days
Sep 15, 9:08 AM CDTRiver Flood WarningLIXHancock, Pearl River7 days

Nearby

Flash Flood Warnings in Mississippi, 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.