Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 31, NWS New Orleans, LA

May 12, 2021Harrison County, Jackson County, Mississippi

NWS New Orleans, LA issued this flash flood warning at May 12, 2021, 3:37 AM CDT for Harrison County, Jackson County, Mississippi. It was in force for 71 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: May 12, 2021, 3:37 AM CDT (08:37 UTC)
Expired: May 12, 2021, 4:48 AM CDT
In force: 71 min
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), 65 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.6 hours before the alert went out and 83 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: 618 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

566 
WGUS54 KLIX 120837
FFWLIX
MSC047-059-121130-
/O.NEW.KLIX.FF.W.0031.210512T0837Z-210512T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service New Orleans LA
337 AM CDT Wed May 12 2021

The National Weather Service in New Orleans has issued a

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

* Until 630 AM CDT.

* At 337 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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...
  Gulfport, Biloxi, Ocean Springs, Long Beach, Moss Point, St. 
  Martin, Escatawpa, Gautier, D'iberville, Latimer, Gulf Hills, 
  Vancleave, Gulf Park Estates, Hickory Hills, Wade, Helena, Big 
  Point, Hurley, Lyman and Saucier.

This includes the following Interstates...
	Interstate 110 in Mississippi near mile marker 1...and
	between mile markers 3 and 4.
	Interstate 10 in Mississippi between mile markers 20 and 76.

Additional rainfall amounts of 2 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.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3039 8932 3068 8911 3068 8888 3074 8888
      3074 8841 3035 8840 3036 8844 3032 8850
      3036 8862 3037 8859 3034 8873 3043 8885
      3043 8893 3042 8901 3042 8891 3036 8882
      3038 8901 3030 8929 3035 8927

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

$$

TE

1 follow-up statement

672 
WGUS74 KLIX 120948
FFSLIX

Flash Flood Statement
National Weather Service New Orleans LA
448 AM CDT Wed May 12 2021

MSC047-059-120958-
/O.CAN.KLIX.FF.W.0031.000000T0000Z-210512T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Harrison MS-Jackson MS-
448 AM CDT Wed May 12 2021

...FLASH FLOOD WARNING IS CANCELLED FOR HARRISON AND JACKSON 
COUNTIES...

Flooding is no longer expected to pose a threat.

A Flash Flood Watch remains in effect until 100 PM CDT Wednesday for 
portions of southeast Louisiana and Mississippi.

LAT...LON 3039 8932 3068 8911 3068 8888 3074 8888
      3074 8841 3035 8840 3036 8844 3032 8850
      3036 8862 3037 8859 3034 8873 3043 8885
      3043 8893 3042 8901 3042 8891 3036 8882
      3038 8901 3030 8929 3035 8927

$$

TE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 9:08 PM CDT	River Flood Warning	LIX	Harrison	4 days
May 11, 9:10 PM CDT	River Flood Warning	LIX	Harrison	60 hr
May 11, 10:31 PM CDT	Flash Flood Warning	LIX	Amite, Wilkinson	3 hr
May 12, 12:16 AM CDT	Flash Flood Warning	LIX	Pike	3 hr
May 12, 2:53 AM CDT	Severe Thunderstorm Warning	LIX	Hancock	24 min
May 12, 3:26 AM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson	11 min
May 12, 9:24 AM CDT	River Flood Warning	LIX	Pike, Walthall	45 hr

Nearby

Flash Flood Warnings in Mississippi, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.