Alert archive / Mississippi / Flash Flood Warnings in 2015

Flash Flood Warning 2, NWS New Orleans, LA

April 12, 2015Harrison County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Apr 12, 2015, 7:50 PM CDT for Harrison County, Mississippi. It was in force for 4 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 12, 2015, 7:50 PM CDT (00:50 UTC)
Expired: Apr 12, 2015, 11:45 PM CDT
In force: 4 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Harrison County, MS

The radar

The Mobile radar (KMOB), 78 km from the middle of the area, began a volume at 00:51 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

Time	Report	Where	Remark
Apr 12, 8:10 PM CDT	FLASH FLOOD	Gulfport, MS	HIGH WATER REPORTED ON US HIGHWAY 90 IN GULFPORT.

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, 0.8 hours before the alert went out and 70 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: 662 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

929 
WGUS54 KLIX 130050
FFWLIX
MSC047-130245-
/O.NEW.KLIX.FF.W.0002.150413T0050Z-150413T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
750 PM CDT SUN APR 12 2015

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN HARRISON COUNTY IN SOUTHEASTERN MISSISSIPPI...

* UNTIL 945 PM CDT

* AT 749 PM CDT...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE
  WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY FALLEN. FLASH
  FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  GULFPORT...BILOXI...LONG BEACH...AND D'IBERVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 ARE POSSIBLE IN THE WARNED 
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND IF FLOODIING THREATENS. ACT QUICKLY TO PROTECT 
YOUR LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3039 8899 3037 8908 3036 8909 3036 8910
      3033 8918 3048 8917 3049 8890 3043 8888
      3043 8893 3042 8895 3043 8899 3041 8899
      3042 8891 3041 8888 3039 8887

$$

11

2 follow-up statements

580 
WGUS74 KLIX 130152
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
852 PM CDT SUN APR 12 2015

MSC047-130245-
/O.CON.KLIX.FF.W.0002.000000T0000Z-150413T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HARRISON MS-
852 PM CDT SUN APR 12 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
SOUTHEASTERN HARRISON COUNTY...

AT 849 PM CDT...EMERGENCY MANAGEMENT REPORTED HEAVY RAIN IN THE 
GULFPORT AND BILOXI AREAS RESULTING IN SIGNIFICANT STREET FLOODING. 
WATER WAS COVERING PORTIONS OF HIGHWAY 90 AND WATERS RESCUES HAVE 
BEEN REPORTED. DOPPLER RADAR ESTIMATES INDICATE THAT 3 TO 5 INCHES 
OF RAIN HAVE FALLEN ACROSS SOUTHEAST HARRISON COUNTY.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
GULFPORT...BILOXI...LONG BEACH...AND D'IBERVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3039 8899 3037 8908 3036 8909 3036 8910
      3033 8918 3048 8917 3049 8890 3043 8888
      3043 8893 3042 8895 3043 8899 3041 8899
      3042 8891 3041 8888 3039 8887

$$

11

563 
WGUS54 KLIX 130238
FFWLIX
MSC047-130445-
/O.EXT.KLIX.FF.W.0002.000000T0000Z-150413T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
938 PM CDT SUN APR 12 2015

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN HARRISON COUNTY IN SOUTHEASTERN MISSISSIPPI...

* UNTIL 1145 PM CDT

* AT 934 PM CDT...DOPPLER RADAR INDICATED LIGHT TO OCCASIONALLY 
  MODERATE RAIN CONTINUING TO FALL ACROSS THE WARNED AREA. THREE TO 
  SIX INCHES OF RAIN HAVE ALREADY FALLEN AND A NUMBER OF ROADWAYS 
  ARE EXPERIENCING SIGNIFICANT FLOODING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  GULFPORT...BILOXI...LONG BEACH...AND D'IBERVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3039 8899 3037 8908 3036 8909 3036 8910
      3033 8918 3048 8917 3049 8890 3043 8888
      3043 8893 3042 8895 3043 8899 3041 8899
      3042 8891 3041 8888 3039 8887

$$

11

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 7:10 PM CDT	Areal Flood Advisory	LIX	Harrison	2 hr
Apr 12, 10:49 PM CDT	Areal Flood Advisory	LIX	Jackson	3 hr
Apr 13, 9:56 AM CDT	Special Weather Statement	LIX	Amite, Wilkinson	49 min
Apr 13, 10:21 AM CDT	Special Weather Statement	LIX	Hancock	69 min
Apr 13, 11:52 AM CDT	Special Weather Statement	LIX	Hancock, Harrison	53 min
Apr 13, 12:47 PM CDT	Special Weather Statement	LIX	Harrison	28 min

Nearby

Flash Flood Warnings in Mississippi, 2015 Every flash flood warning in 2015

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.