Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 89, NWS Jackson, MS

July 21, 2012Kemper County, Lauderdale County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 21, 2012, 6:38 AM CDT for Kemper County, Lauderdale County, Mississippi. It was in force for 2 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: Jul 21, 2012, 6:38 AM CDT (11:38 UTC)
Expired: Jul 21, 2012, 8:45 AM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Kemper County, MS, Lauderdale County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 115 km from the middle of the area, began a volume at 11:40 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
Jul 21, 7:00 AM CDT	FLASH FLOOD	Martin, MS	RDS FLOODED AROUND MARTIN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 11.6 hours before the alert went out and 123 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: 4897 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

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

206 
WGUS54 KJAN 211138
FFWJAN
MSC069-075-211345-
/O.NEW.KJAN.FF.W.0089.120721T1138Z-120721T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
638 AM CDT SAT JUL 21 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN KEMPER COUNTY IN EAST CENTRAL MISSISSIPPI...
  NORTHWESTERN LAUDERDALE COUNTY IN EAST CENTRAL MISSISSIPPI...

* UNTIL 845 AM CDT

* AT 638 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  DE KALB TO MARTIN. THE STORMS WERE NEARLY STATIONARY. ESTIMATED    
  RADAR RAINFALL AMOUNTS...ON THE ORDER OF TWO TO FOUR INCHES...HAVE 
  OCCURRED IN THE PAST HOUR.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  BLACKWATER...PRISMATIC AND COLLINSVILLE

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
TWO HOURS 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 3245 8877 3243 8891 3245 8892 3280 8890
      3281 8854

$$

1 follow-up statement

855 
WGUS74 KJAN 211214
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
714 AM CDT SAT JUL 21 2012

MSC069-075-211345-
/O.CON.KJAN.FF.W.0089.000000T0000Z-120721T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAUDERDALE MS-KEMPER MS-
714 AM CDT SAT JUL 21 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 AM CDT FOR
SOUTHWESTERN KEMPER AND NORTHWESTERN LAUDERDALE COUNTIES...

AT 713 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH 
FLOODING NEAR MARTIN. SEVERAL ROADS WERE UNDER WATER. THE STORMS 
PRODUCING THIS VERY HEAVY RAINFALL WERE NEARLY STATIONARY. ESTIMATED 
RADAR RAINFALL AMOUNTS...ON THE ORDER OF THREE TO FOUR INCHES...HAVE 
OCCURRED IN THE PAST TWO HOURS.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BLUFF
SPRINGS...BLACKWATER...PRISMATIC...DAMASCUS...LIBERTY AND DE KALB

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
TWO HOURS. 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 3245 8877 3243 8891 3245 8892 3280 8890
      3281 8854

$$

CME

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:00 PM CDT	Special Weather Statement	JAN	Simpson	30 min
Jul 20, 7:07 PM CDT	Severe Thunderstorm Warning	JAN	Claiborne	38 min
Jul 20, 7:11 PM CDT	Special Weather Statement	JAN	Simpson	29 min
Jul 21, 3:48 AM CDT	Special Weather Statement	JAN	Noxubee	32 min
Jul 21, 4:19 AM CDT	Special Weather Statement	JAN	Lowndes, Noxubee	56 min
Jul 21, 5:45 AM CDT	Special Weather Statement	JAN	Newton	45 min
Jul 21, 5:50 AM CDT	Severe Thunderstorm Warning	JAN	Newton	27 min
Jul 21, 6:56 AM CDT	Special Weather Statement	JAN	Rankin	59 min
Jul 21, 7:07 AM CDT	Flash Flood Warning	JAN	Holmes	3 hr
Jul 21, 8:28 AM CDT	Flash Flood Warning	JAN	Rankin	2 hr
Jul 21, 9:25 AM CDT	Flash Flood Warning	JAN	Copiah, Franklin, Lincoln	2 hr

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; radar from the NEXRAD Level II archive.