Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 87, NWS Jackson, MS

July 20, 2012Jefferson Davis County, Marion County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 20, 2012, 3:07 PM CDT for Jefferson Davis County, Marion County, Mississippi. It was in force for 113 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, 3:07 PM CDT (20:07 UTC)
Expired: Jul 20, 2012, 5:00 PM CDT
In force: 113 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Jefferson Davis County, MS, Marion County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.1 hours before the alert went out and 113 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: 979 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

716 
WGUS54 KJAN 202007
FFWJAN
MSC065-091-202200-
/O.NEW.KJAN.FF.W.0087.120720T2007Z-120720T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
307 PM CDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN JEFFERSON DAVIS COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  MARION COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...KOKOMO...COLUMBIA...

* UNTIL 500 PM CDT

* AT 307 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  7 MILES SOUTHWEST OF COLLINS TO COLUMBIA...MOVING SOUTHWEST AT     
  10 MPH. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF ONE     
  TO THREE INCHES...HAVE OCCURRED IN THE PAST HOUR FOR PORTIONS OF   
  THE WARNED AREA NORTHEAST OF COLUMBIA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  BUNKER HILL...SOCIETY HILL...MORGANTOWN...HOLLY SPRINGS AND GOSS

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
HOUR WITH AN ADDITIONAL ONE TO THREE 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.

&&

LAT...LON 3112 8995 3113 9001 3125 9005 3133 9005
      3139 8997 3159 8972 3155 8962 3150 8959
      3143 8963 3143 8965 3140 8965 3120 8978
      3108 8992

$$

BYB

1 follow-up statement

118 
WGUS74 KJAN 202113
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
413 PM CDT FRI JUL 20 2012

MSC065-202123-
/O.CAN.KJAN.FF.W.0087.000000T0000Z-120720T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON DAVIS MS-
413 PM CDT FRI JUL 20 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN
JEFFERSON DAVIS COUNTY...

LAT...LON 3113 9002 3117 9002 3118 9004 3123 9004
      3124 9005 3133 9005 3139 8996 3139 8982
      3125 8976 3112 8994 3113 9001

$$

MSC091-202200-
/O.CON.KJAN.FF.W.0087.000000T0000Z-120720T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MARION MS-
413 PM CDT FRI JUL 20 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
CENTRAL MARION COUNTY...

AT 413 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE 
EXTENDING FROM 16 MILES NORTHWEST OF COLUMBIA TO 9 MILES SOUTH OF 
KOKOMO...MOVING SOUTHWEST AT 5 MPH. ESTIMATED RADAR RAINFALL 
AMOUNTS...ON THE ORDER OF ONE TO THREE INCHES...HAVE OCCURRED IN THE 
PAST HOUR.

THE STORMS WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT HOUR. 
WITH AN ADDITIONAL ONE INCH 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.

&&

LAT...LON 3113 9002 3117 9002 3118 9004 3123 9004
      3124 9005 3133 9005 3139 8996 3139 8982
      3125 8976 3112 8994 3113 9001

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:26 PM CDT	Special Weather Statement	JAN	Grenada	29 min
Jul 20, 2:28 PM CDT	Special Weather Statement	JAN	Marion	27 min
Jul 20, 2:38 PM CDT	Special Weather Statement	JAN	Covington	32 min
Jul 20, 3:04 PM CDT	Special Weather Statement	JAN	Covington	31 min
Jul 20, 3:34 PM CDT	Special Weather Statement	JAN	Adams	31 min
Jul 20, 5:34 PM CDT	Severe Thunderstorm Warning	JAN	Jasper, Newton	40 min
Jul 20, 5:41 PM CDT	Special Weather Statement	JAN	Simpson	29 min
Jul 20, 5:46 PM CDT	Special Weather Statement	JAN	Lincoln	29 min
Jul 20, 6:29 PM CDT	Special Weather Statement	JAN	Franklin	31 min
Jul 20, 6:35 PM CDT	Special Weather Statement	JAN	Rankin	30 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.