Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 99, NWS Jackson, MS

August 9, 20124 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at Aug 9, 2012, 8:50 AM CDT for 4 counties in Mississippi. It was in force for 3 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: Aug 9, 2012, 8:50 AM CDT (13:50 UTC)
Expired: Aug 9, 2012, 12:15 PM CDT
In force: 3 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, MS, Clay County, MS, Oktibbeha County, MS, Webster County, MS

The radar

The Columbus AFB radar (KGWX), 73 km from the middle of the area, began a volume at 13:49 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
Aug 9, 10:00 AM CDT	FLASH FLOOD	Sherwood, MS	WATER WAS REPORTED ACROSS ROADS MAINLY IN NORTHEAST CHOCTAW COUNTY NEAR MATHISTON

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 12:00Z, 1.8 hours before the alert went out and 168 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: 1768 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

039 
WGUS54 KJAN 091350
FFWJAN
MSC019-025-105-155-091545-
/O.NEW.KJAN.FF.W.0099.120809T1350Z-120809T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
850 AM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CHOCTAW COUNTY IN CENTRAL MISSISSIPPI...
  SOUTHEASTERN WEBSTER COUNTY IN NORTH CENTRAL MISSISSIPPI...
  SOUTHWESTERN CLAY COUNTY IN NORTHEAST MISSISSIPPI...
  OKTIBBEHA COUNTY IN NORTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF STARKVILLE...

* UNTIL 1045 AM CDT

* AT 850 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR REFORM...OR 17 MILES
  WEST OF STARKVILLE...MOVING EAST AT 25 MPH. ESTIMATED RADAR
  RAINFALL AMOUNTS...ON THE ORDER OF TWO TO FOUR INCHES...HAVE
  OCCURRED IN THE PAST TWO HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MABEN...PHEBA...CRAIG SPRINGS...LONGVIEW...OKTOC...SESSUMS AND
  MULDROW

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 3351 8866 3350 8867 3329 8867 3329 8928
      3338 8934 3354 8934 3360 8909 3361 8895
      3357 8866

$$

JA

1 follow-up statement

849 
WGUS54 KJAN 091527
FFWJAN
MSC019-025-105-155-091715-
/O.EXT.KJAN.FF.W.0099.000000T0000Z-120809T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1027 AM CDT THU AUG 9 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CHOCTAW COUNTY IN CENTRAL MISSISSIPPI...
  SOUTHEASTERN WEBSTER COUNTY IN NORTH CENTRAL MISSISSIPPI...
  SOUTHWESTERN CLAY COUNTY IN NORTHEAST MISSISSIPPI...
  OKTIBBEHA COUNTY IN NORTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF STARKVILLE...

* UNTIL 1215 PM CDT

* AT 1027 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR SHERWOOD...OR 18 MILES
  WEST OF STARKVILLE...MOVING EAST AT 25 MPH. ESTIMATED RADAR
  RAINFALL AMOUNTS...ON THE ORDER OF FIVE INCHES...HAVE OCCURRED IN
  THE PAST THREE HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MABEN...PHEBA...LONGVIEW...CRAIG SPRINGS...OKTOC...SESSUMS AND
  MULDROW

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 3351 8866 3350 8867 3329 8867 3329 8928
      3338 8934 3354 8934 3360 8909 3361 8895
      3357 8866

$$

JA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 7:38 PM CDT	Special Weather Statement	JAN	Bolivar	32 min
Aug 8, 7:40 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar	35 min
Aug 8, 8:11 PM CDT	Special Weather Statement	JAN	Clarke	29 min
Aug 9, 6:54 AM CDT	Special Weather Statement	JAN	Webster	26 min
Aug 9, 8:25 AM CDT	Special Weather Statement	JAN	Oktibbeha	25 min
Aug 9, 8:41 AM CDT	Flash Flood Warning	JAN	Carroll, Grenada, Montgomery, Webster	3 hr
Aug 9, 9:02 AM CDT	Special Weather Statement	JAN	Coahoma	28 min
Aug 9, 9:12 AM CDT	Special Weather Statement	JAN	Grenada	28 min
Aug 9, 11:00 AM CDT	Special Weather Statement	JAN	Attala	45 min
Aug 9, 11:22 AM CDT	Special Weather Statement	JAN	Attala	28 min
Aug 9, 11:38 AM CDT	Special Weather Statement	JAN	Madison	47 min
Aug 9, 12:42 PM CDT	Special Weather Statement	JAN	Leake, Neshoba	43 min
Aug 9, 1:27 PM CDT	Special Weather Statement	JAN	Simpson	43 min
Aug 9, 1:41 PM CDT	Special Weather Statement	JAN	Hinds	44 min
Aug 9, 2:22 PM CDT	Special Weather Statement	JAN	Copiah, Rankin, Simpson	43 min
Aug 9, 2:53 PM CDT	Special Weather Statement	JAN	Lincoln	32 min
Aug 9, 3:10 PM CDT	Special Weather Statement	JAN	Lincoln	30 min
Aug 9, 3:20 PM CDT	Special Weather Statement	JAN	Forrest	30 min
Aug 9, 3:30 PM CDT	Special Weather Statement	JAN	Covington	30 min
Aug 9, 3:41 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Jones	38 min
Aug 9, 3:55 PM CDT	Special Weather Statement	JAN	Lamar, Marion	30 min
Aug 9, 4:02 PM CDT	Severe Thunderstorm Warning	JAN	Forrest, Lamar, Marion	58 min
Aug 9, 4:10 PM CDT	Special Weather Statement	JAN	Jones	30 min
Aug 9, 5:01 PM CDT	Special Weather Statement	JAN	Forrest	29 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; radar from the NEXRAD Level II archive.