Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 38, NWS New Orleans, LA

July 20, 2012Jackson County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Jul 20, 2012, 1:04 PM CDT for Jackson County, Mississippi. It was in force for 93 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: Jul 20, 2012, 1:04 PM CDT (18:04 UTC)
Expired: Jul 20, 2012, 2:37 PM CDT
In force: 93 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Jackson County, MS

The radar

The Mobile radar (KMOB), 45 km from the middle of the area, began a volume at 18:06 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 12:00Z, 6.1 hours before the alert went out and 104 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: 1085 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 62 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.

077 
WGUS54 KLIX 201804
FFWLIX
MSC059-202000-
/O.NEW.KLIX.FF.W.0038.120720T1804Z-120720T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
104 PM CDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JACKSON COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...ST. MARTIN...PASCAGOULA...OCEAN
  SPRINGS...MOSS POINT...ESCATAWPA...

* UNTIL 300 PM CDT

* AT 1258 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WADE AND
  VANCLEAVE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA BEFORE 3 PM CDT.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN NEW
ORLEANS.

&&

LAT...LON 3038 8842 3034 8874 3040 8884 3043 8887
      3057 8888 3067 8855 3058 8842

$$


24/RR

1 follow-up statement

358 
WGUS74 KLIX 201937
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
237 PM CDT FRI JUL 20 2012

MSC059-201946-
/O.CAN.KLIX.FF.W.0038.000000T0000Z-120720T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JACKSON MS-
237 PM CDT FRI JUL 20 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR JACKSON COUNTY...

THE STORMS PROMPTING THE FLASH FLOOD WARNING HAVE DISSIPATED. A 
FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR THE 
POSSIBILITY OF ADDITIONAL ROUNDS OF HEAVY RAIN. 

LAT...LON 3038 8842 3034 8874 3040 8884 3043 8887
      3057 8888 3067 8855 3058 8842

$$


24/RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:48 PM CDT	Areal Flood Advisory	LIX	Amite, Wilkinson	117 min
Jul 20, 12:22 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson, Pearl River	113 min
Jul 20, 2:15 PM CDT	Areal Flood Advisory	LIX	Hancock, Pearl River	60 min
Jul 20, 3:24 PM CDT	Areal Flood Advisory	LIX	Pike, Walthall	111 min
Jul 20, 5:16 PM CDT	Areal Flood Advisory	LIX	Amite, Pike, Walthall	119 min
Jul 20, 5:46 PM CDT	Severe Thunderstorm Warning	LIX	Wilkinson	31 min

Nearby

Flash Flood Warnings in Mississippi, 2012 Every flash flood warning in 2012

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.