Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 115, NWS Jackson, MS

August 29, 20124 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at Aug 29, 2012, 4:46 PM CDT for 4 counties in Mississippi. It was in force for 5 hr. 14 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: Aug 29, 2012, 4:46 PM CDT (21:46 UTC)
Expired: Aug 29, 2012, 9:30 PM CDT
In force: 5 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Forrest County, MS, Jones County, MS, Lamar County, MS, Marion County, MS

What was reported inside it

Time	Report	Where	Remark
Aug 29, 6:00 PM CDT	HEAVY RAIN 6.92	5 Ene Kokomo, MS	5.83 INCHES OF RAIN MEASURED OVER THE PAST 6 HOURS AT THE MARION COUNTY RAWS SITE. STORM TOTAL ACCUMULATION OF 6.92 INCHES
Aug 29, 6:00 PM CDT	HEAVY RAIN 10.73	5 Ene Kokomo, MS	3.96 INCHES OF RAIN MEASURED OVER THE PAST 6 HOURS AT THE MARION COUNTY RAWS SITE. STORM TOTAL ACCUMULATION OF 10.73 INCHES
Aug 29, 7:00 PM CDT	FLASH FLOOD	Columbia, MS	SEVERAL ROADS FLOODED ACROSS MARION COUNTY
Aug 29, 7:05 PM CDT	FLASH FLOOD	Baxterville, MS	SEVEN ROADS CLOSED DUE TO FLOODING IN LAMAR COUNTY...MAINLY IN THE SOUTHWEST PART OF THE COUNTY.
Aug 29, 8:35 PM CDT	FLASH FLOOD	Hattiesburg, MS	MULTIPLE RDS AND STREETS AROUND TOWN HAVE ROUGHLY 6 INCHES OF WATER COVERING THEM...RAIN FALLING HEAVILY.
Aug 29, 9:00 PM CDT	FLASH FLOOD	3 E Baxterville, MS	PARTS OF ENTREKIN RD FLOODED...RD IS CLOSED TO TRAFFIC.
Aug 29, 9:00 PM CDT	HEAVY RAIN 5.31	4 Sse Hattiesburg, MS	AT HBG
Aug 29, 9:00 PM CDT	HEAVY RAIN 7.3	5 Ssw Hattiesburg, MS	AT THE EOC
Aug 29, 9:00 PM CDT	HEAVY RAIN 7.53	Brooklyn, MS
Aug 29, 9:00 PM CDT	HEAVY RAIN 7.69	Columbia, MS
Aug 29, 9:00 PM CDT	HEAVY RAIN 9.61	2 W Columbia, MS
Aug 29, 9:00 PM CDT	COASTAL FLOOD	3 E Baxterville, MS	PARTS OF ENTREKIN RD FLOODED...RD IS CLOSED TO TRAFFIC.
Aug 29, 9:35 PM CDT	FLASH FLOOD	4 Ene Rock Hill, MS	WATER CROSSING JB HORNE ROAD IN SEVERAL PLACES
Aug 29, 9:40 PM CDT	FLASH FLOOD	Brooklyn, MS	MULTIPLE RDS FLOODED ACROSS S FORREST CO...A CULVERT WASHED OUT ON FROG BOTTOM RD.

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 12:00Z, 9.8 hours before the alert went out and 110 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: 625 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 465 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 8.7

Open this sounding in Storm Lab

The text

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

387 
WGUS54 KJAN 292146
FFWJAN
MSC035-067-073-091-300230-
/O.NEW.KJAN.FF.W.0115.120829T2146Z-120830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
446 PM CDT WED AUG 29 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MARION COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...SANDY HOOK...COLUMBIA...
  FORREST COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...PETAL...HATTIESBURG...
  JONES COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...LAUREL...ELLISVILLE...
  LAMAR COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF WEST HATTIESBURG...

* UNTIL 930 PM CDT

* AT 445 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  SQUALLS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  PICKWICK TO 10 MILES EAST OF MAXIE...MOVING NORTHWEST AT 40 MPH. 
  ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF FOUR TO EIGHT
  INCHES...HAVE ALREADY OCCURRED TODAY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  BROOKLYN...ROCK HILL...PURVIS...MCLAURIN...MORGANTOWN...HOLLY
  SPRINGS...GOSS...IMPROVE...SUNRISE...RAWLS SPRINGS...SUMRALL...
  MACEDONIA...OVETT...EASTABUCHIE...MOSELLE...TUCKERS CROSSING...
  AND SANDERSVILLE

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA AT LEAST 
930 PM WITH AN ADDITIONAL TWO TO FOUR INCHES POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

CONTACT LOCAL LAW ENFORCEMENT AND THEY WILL RELAY FLOODING REPORTS TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN JACKSON.

&&

LAT...LON 3100 8935 3100 8941 3098 8943 3101 8951
      3102 8983 3107 8985 3107 8988 3115 8999
      3139 9003 3138 8979 3143 8979 3143 8939
      3179 8940 3182 8896 3145 8896 3144 8915
      3091 8914 3091 8934

$$

40

1 follow-up statement

105 
WGUS74 KJAN 300002
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
702 PM CDT WED AUG 29 2012

MSC035-067-073-091-300230-
/O.CON.KJAN.FF.W.0115.000000T0000Z-120830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARION MS-LAMAR MS-JONES MS-FORREST MS-
702 PM CDT WED AUG 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
FORREST...JONES...LAMAR AND MARION COUNTIES...

AT 701 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
DETECT AREA OF HEAVY RAIN MOVING ACROSS SOUTH MISSISSIPPI. ESTIMATED 
RADAR RAINFALL AMOUNTS...ON THE ORDER OF FIVE TO SEVEN INCHES...HAVE 
OCCURRED IN THE PAST SIX HOURS.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILL
CREEK...TUCKERS CROSSING...MOSELLE...OVETT...EASTABUCHIE...
MACEDONIA...RAWLS SPRINGS...SUNRISE...MORGANTOWN...HOLLY SPRINGS...
GOSS...IMPROVE...SUMRALL...SANDERSVILLE...PETAL...LAUREL...
HATTIESBURG...ELLISVILLE AND COLUMBIA

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT 
THREE TO SIX HOURS. WITH AN ADDITIONAL TWO TO FOUR INCHES 
LIKELY...ISOLATED HIGHER AMOUNTS IN EXCESS OF 5 INCHES WILL BE 
POSSIBLE IN HEAVIER BANDS.

HOMES HAVE BEEN FLOODED IN PORTIONS OF MARION COUNTY NEAR THE EXPOSE 
COMMUNITY...IN ADDITION TO SEVERAL ROAD CLOSURES ACROSS SOUTH 
MISSISSIPPI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

CONTACT LOCAL LAW ENFORCEMENT AND THEY WILL RELAY FLOODING REPORTS TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN JACKSON.

&&

LAT...LON 3100 8935 3100 8941 3098 8943 3101 8951
      3102 8983 3107 8985 3107 8988 3115 8999
      3139 9003 3138 8979 3143 8979 3143 8939
      3179 8940 3182 8896 3145 8896 3144 8915
      3091 8914 3091 8934

$$


7

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 9:09 PM CDT	River Flood Warning	JAN	Franklin	49 hr
Aug 29, 12:47 AM CDT	Special Weather Statement	JAN	Forrest, Lamar, Marion	38 min
Aug 29, 5:12 AM CDT	Tornado Warning	JAN	Forrest	18 min
Aug 29, 5:53 AM CDT	Tornado Warning	JAN	Forrest	22 min
Aug 29, 10:57 AM CDT	Flash Flood Warning	JAN	Forrest, Lamar, Marion	6 hr
Aug 29, 11:51 AM CDT	Special Weather Statement	JAN	Forrest, Lamar, Marion	59 min
Aug 29, 12:01 PM CDT	Special Weather Statement	JAN	Covington, Jefferson Davis, Lawrence	59 min
Aug 29, 2:16 PM CDT	Special Weather Statement	JAN	Forrest, Lamar, Marion	59 min
Aug 29, 3:38 PM CDT	Flash Flood Warning	JAN	Covington, Jefferson Davis, Lawrence, Lincoln	6 hr
Aug 29, 4:44 PM CDT	Wind Advisory	JAN	Attala, Bolivar, Clarke, Copiah, Hinds, Holmes and 17 more	23 hr
Aug 29, 5:17 PM CDT	Special Weather Statement	JAN	Forrest, Jefferson Davis, Lamar, Lawrence, Lincoln, Marion	58 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.