Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS New Orleans, LA

April 15, 2021Harrison County, Jackson County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Apr 15, 2021, 3:35 AM CDT for Harrison County, Jackson County, Mississippi. It was in force for 3 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, 3:35 AM CDT (08:35 UTC)
Expired
Apr 15, 2021, 6:45 AM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 56 km from the middle of the area, began a volume at 08:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 15, 5:52 AM CDTFLASH FLOOD1 Wnw Gautier, MSHIGH WATER REPORTED ON ROADS IN GAUTIER AND MOSS POINT. SEVERAL ROADS RENDERED IMPASSABLE AND CLOSED DUE TO THE HIGH WATER.

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, 8.6 hours before the alert went out and 95 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 00:00Z on 2021-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 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 00:00Z on 2021-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 311 square meters per square second.19395878Sfc1 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
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

Open this sounding in Storm Lab

The text

As transmitted.

167 
WGUS54 KLIX 150835
FFWLIX
MSC047-059-151145-
/O.NEW.KLIX.FF.W.0019.210415T0835Z-210415T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
335 AM CDT Thu Apr 15 2021

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  Southeastern Harrison County in southern Mississippi...
  Southern Jackson County in southern Mississippi...

* Until 645 AM CDT.

* At 335 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...
  Gulfport, Biloxi, Ocean Springs, Moss Point, St. Martin, 
  Escatawpa, Gautier, D'iberville, Gulf Park Estates, Hickory Hills, 
  Gulf Hills, Vancleave, Latimer and Helena.

Additional rainfall amounts of 1 to 3 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.

&&

LAT...LON 3038 8904 3043 8910 3052 8889 3047 8840
      3039 8839 3038 8841 3035 8839 3036 8844
      3032 8848 3035 8851 3035 8858 3037 8859
      3034 8873 3042 8885 3042 8883 3043 8885
      3042 8901 3042 8890 3036 8882 3039 8887

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 2 HOURS 

$$

CAB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 9:04 PM CDTRiver Flood WarningLIXPearl River4 days
Apr 14, 9:34 PM CDTSpecial Weather StatementLIXHancock71 min
Apr 15, 2:38 AM CDTSevere Thunderstorm WarningLIXPike27 min
Apr 15, 2:44 AM CDTSpecial Weather StatementLIXPearl River61 min
Apr 15, 3:04 AM CDTSevere Thunderstorm WarningLIXJackson41 min
Apr 15, 3:10 AM CDTSpecial Weather StatementLIXWalthall65 min
Apr 15, 3:16 AM CDTFlash Flood WarningLIXHancock, Harrison3 hr
Apr 15, 3:26 AM CDTSpecial Weather StatementLIXGeorge34 min
Apr 15, 3:40 AM CDTSpecial Weather StatementLIXWilkinson95 min
Apr 15, 3:49 AM CDTSevere Thunderstorm WarningLIXJackson41 min
Apr 15, 3:59 AM CDTSpecial Weather StatementLIXWilkinson76 min
Apr 15, 4:34 AM CDTSpecial Weather StatementLIXJackson56 min
Apr 15, 4:36 AM CDTSevere Thunderstorm WarningLIXAmite, Wilkinson24 min
Apr 15, 4:44 AM CDTSevere Thunderstorm WarningLIXJackson31 min
Apr 15, 6:40 AM CDTRiver Flood WarningLIXPearl River4 days
Apr 15, 6:44 AM CDTRiver Flood WarningLIXPike33 hr
Apr 15, 7:43 AM CDTRiver Flood WarningLIXHarrison51 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.