Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 18, NWS New Orleans, LA

April 15, 2021Hancock County, Harrison County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Apr 15, 2021, 3:16 AM CDT for Hancock County, Harrison County, Mississippi. It was in force for 3 hr. 2 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: Apr 15, 2021, 3:16 AM CDT (08:16 UTC)
Expired: Apr 15, 2021, 6:15 AM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Hancock County, MS, Harrison County, MS

What was reported inside it

Time	Report	Where	Remark
Apr 15, 4:40 AM CDT	FLASH FLOOD	5 Nw Kiln, MS	EM REPORT OF FLOODING ACROSS CENTRAL AND NORTHERN PORTIONS OF HANCOCK COUNTY, WITH A FEW ROAD CLOSURES DUE TO WATER COVERED ROADWAYS.
Apr 15, 5:00 AM CDT	FLASH FLOOD	3 S Lyman, MS	BROADCAST MEDIA REPORT OF ROAD CLOSURES BETWEEN LANDON ROAD AND ROBINSON ROAD, AS WELL AS SHAW ROAD NEAR MORGAN LANE IN HARRISON COUNTY DUE TO FLASH FLOODING.

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, 8.3 hours before the alert went out and 40 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: 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.

968 
WGUS54 KLIX 150816
FFWLIX
MSC045-047-151115-
/O.NEW.KLIX.FF.W.0018.210415T0816Z-210415T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in New Orleans has issued a

* Flash Flood Warning for...
  East Central Hancock County in southern Mississippi...
  Southwestern Harrison County in southern Mississippi...

* Until 615 AM CDT.

* At 316 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5.5 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, Long Beach, Bay St. Louis, Waveland, Diamondhead, Kiln, 
  Shoreline Park and Gulfport 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 3051 8954 3054 8923 3038 8904 3036 8909
      3036 8910 3030 8928 3030 8929 3032 8929
      3035 8927 3036 8929 3036 8928 3037 8931
      3037 8935 3034 8938 3034 8934 3032 8932
      3030 8933 3030 8934 3035 8954

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.75-3.5 INCHES IN 3 HOURS 

$$

CAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 9:04 PM CDT	River Flood Warning	LIX	Pearl River	4 days
Apr 14, 9:34 PM CDT	Special Weather Statement	LIX	Hancock	71 min
Apr 15, 2:38 AM CDT	Severe Thunderstorm Warning	LIX	Pike	27 min
Apr 15, 2:44 AM CDT	Special Weather Statement	LIX	Pearl River	61 min
Apr 15, 3:04 AM CDT	Severe Thunderstorm Warning	LIX	Jackson	41 min
Apr 15, 3:10 AM CDT	Special Weather Statement	LIX	Walthall	65 min
Apr 15, 3:26 AM CDT	Special Weather Statement	LIX	George	34 min
Apr 15, 3:35 AM CDT	Flash Flood Warning	LIX	Harrison, Jackson	3 hr
Apr 15, 3:40 AM CDT	Special Weather Statement	LIX	Wilkinson	95 min
Apr 15, 3:49 AM CDT	Severe Thunderstorm Warning	LIX	Jackson	41 min
Apr 15, 3:59 AM CDT	Special Weather Statement	LIX	Wilkinson	76 min
Apr 15, 4:34 AM CDT	Special Weather Statement	LIX	Jackson	56 min
Apr 15, 4:36 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	24 min
Apr 15, 4:44 AM CDT	Severe Thunderstorm Warning	LIX	Jackson	31 min
Apr 15, 6:40 AM CDT	River Flood Warning	LIX	Pearl River	4 days
Apr 15, 6:44 AM CDT	River Flood Warning	LIX	Pike	33 hr
Apr 15, 7:43 AM CDT	River Flood Warning	LIX	Harrison	51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.