Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 131, NWS Jackson, MS

August 30, 2012Covington County, Jefferson Davis County, Lawrence County, Mississippi

NWS Jackson, MS issued this flash flood warning at Aug 30, 2012, 9:14 AM CDT for Covington County, Jefferson Davis County, Lawrence County, Mississippi. It was in force for 4 hr. 2 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 30, 2012, 9:14 AM CDT (14:14 UTC)
Expired: Aug 30, 2012, 1:15 PM CDT
In force: 4 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Covington County, MS, Jefferson Davis County, MS, Lawrence County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 91 km from the middle of the area, began a volume at 14:15 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 30, 10:40 AM CDT	HEAVY RAIN 5.6	Prentiss, MS	MEASURED AT EOC OFFICE.
Aug 30, 12:24 PM CDT	FLASH FLOOD	Bassfield, MS	FIFTEEN ROADS CLOSED AROUND THE COUNTY FROM HEAVY RAINS EARLIER THIS MORNING.

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, 2.2 hours before the alert went out and 97 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: 107 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 473 m²/s²
0-3 km storm-relative helicity: 650 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

234 
WGUS54 KJAN 301414
FFWJAN
MSC031-065-077-301815-
/O.NEW.KJAN.FF.W.0131.120830T1414Z-120830T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
914 AM CDT THU AUG 30 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JEFFERSON DAVIS COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  LAWRENCE COUNTY IN SOUTH CENTRAL MISSISSIPPI...
  COVINGTON COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF COLLINS...

* UNTIL 115 PM CDT

* AT 912 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  MORE RAINBAND SQUALLS PRODUCING VERY HEAVY RAIN ALONG A LINE       
  EXTENDING FROM MONTICELLO TO MELBA...MOVING NORTH AT 30 MPH.       
  ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF 8 TO 12         
  INCHES...HAVE OCCURRED.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  PROGRESS...CARSON...SANFORD...WANILLA...SONTAG...PRENTISS...LONE
  STAR...OMA...HEBRON...CLEM AND MOUNT OLIVE

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
FOUR HOURS WITH AN ADDITIONAL TWO TO THREE INCHES POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3136 9024 3173 9023 3179 8941 3144 8940
      3143 8953 3143 8982 3140 8982 3139 9004
      3135 9005

$$

40

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 8:06 PM CDT	Special Weather Statement	JAN	Covington, Forrest, Jefferson Davis, Lamar, Lawrence, Lincoln and 1 more	54 min
Aug 29, 9:28 PM CDT	Flash Flood Warning	JAN	Covington, Forrest, Jones, Lamar	6 hr
Aug 29, 9:35 PM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence, Lincoln, Marion	6 hr
Aug 29, 10:15 PM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence, Lincoln, Marion	5 hr
Aug 29, 11:13 PM CDT	Special Weather Statement	JAN	Copiah, Hinds, Jasper, Jones, Rankin, Simpson and 1 more	57 min
Aug 30, 12:23 AM CDT	Flash Flood Warning	JAN	Jasper, Smith	6 hr
Aug 30, 2:05 AM CDT	Flash Flood Warning	JAN	Copiah, Simpson	6 hr
Aug 30, 2:10 AM CDT	River Flood Warning	JAN	Jones	6 days
Aug 30, 2:52 AM CDT	Flash Flood Warning	JAN	Clarke	6 hr
Aug 30, 2:55 AM CDT	Tornado Warning	JAN	Clarke, Jasper	29 min
Aug 30, 3:21 AM CDT	Flash Flood Warning Emergency	JAN	Covington, Forrest, Jones, Lamar	6 hr
Aug 30, 3:23 AM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence, Marion	112 min
Aug 30, 3:29 AM CDT	Flash Flood Warning	JAN	Franklin, Lincoln	6 hr
Aug 30, 5:06 AM CDT	Tornado Warning	JAN	Clarke, Lauderdale	24 min
Aug 30, 5:07 AM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lamar, Lawrence, Marion	4 hr
Aug 30, 5:45 AM CDT	Tornado Warning	JAN	Clarke, Lauderdale	45 min
Aug 30, 6:40 AM CDT	Tornado Warning	JAN	Neshoba, Newton	23 min
Aug 30, 6:52 AM CDT	Tornado Warning	JAN	Clarke, Lauderdale	53 min
Aug 30, 7:21 AM CDT	Flash Flood Warning	JAN	Lauderdale, Newton	6 hr
Aug 30, 7:35 AM CDT	Flash Flood Warning	JAN	Hinds, Rankin	6 hr
Aug 30, 7:37 AM CDT	Tornado Warning	JAN	Clarke	29 min
Aug 30, 7:41 AM CDT	Tornado Warning	JAN	Kemper, Lauderdale, Neshoba, Newton	27 min
Aug 30, 8:09 AM CDT	Flash Flood Warning	JAN	Copiah, Simpson	5 hr
Aug 30, 8:29 AM CDT	Tornado Warning	JAN	Clarke	46 min
Aug 30, 8:37 AM CDT	Flash Flood Warning	JAN	Clarke	5 hr
Aug 30, 8:57 AM CDT	Flash Flood Warning	JAN	Lamar, Marion	4 hr
Aug 30, 9:10 AM CDT	Tornado Warning	JAN	Covington, Forrest, Jones, Lamar	36 min
Aug 30, 9:36 AM CDT	Tornado Warning	JAN	Clarke	39 min
Aug 30, 9:41 AM CDT	Flash Flood Warning	JAN	Lincoln	4 hr
Aug 30, 10:12 AM CDT	River Flood Warning	JAN	Attala, Holmes	12 hr
Aug 30, 10:14 AM CDT	Tornado Warning	JAN	Clarke, Lauderdale	46 min
Aug 30, 10:21 AM CDT	River Flood Warning	JAN	Covington, Forrest	47 hr
Aug 30, 10:24 AM CDT	River Flood Warning	JAN	Clarke	34 hr
Aug 30, 10:36 AM CDT	Flash Flood Warning	JAN	Forrest	3 hr
Aug 30, 10:54 AM CDT	River Flood Warning	JAN	Leake	10 hr
Aug 30, 11:28 AM CDT	Flash Flood Warning	JAN	Jones	107 min
Aug 30, 11:30 AM CDT	River Flood Warning	JAN	Copiah, Simpson	10 hr
Aug 30, 11:30 AM CDT	River Flood Warning	JAN	Lawrence	4 days
Aug 30, 11:30 AM CDT	River Flood Warning	JAN	Marion	56 hr
Aug 30, 11:30 AM CDT	River Flood Warning	JAN	Simpson	10 hr
Aug 30, 12:37 PM CDT	Areal Flood Warning	JAN	Covington, Forrest, Jefferson Davis, Jones, Lamar, Lawrence and 1 more	12 hr
Aug 30, 12:57 PM CDT	Areal Flood Warning	JAN	Copiah, Hinds, Lincoln, Rankin, Simpson	12 hr
Aug 30, 1:38 PM CDT	Tornado Warning	JAN	Kemper, Lauderdale	34 min
Aug 30, 3:37 PM CDT	Flash Flood Warning	JAN	Forrest, Lamar	5 hr
Aug 30, 4:53 PM CDT	Flash Flood Warning	JAN	Washington	112 min
Aug 30, 4:57 PM CDT	Flash Flood Warning	JAN	Jones	3 hr
Aug 30, 5:16 PM CDT	Tornado Warning	JAN	Forrest	14 min
Aug 30, 6:25 PM CDT	Areal Flood Warning	JAN	Lauderdale	8 hr
Aug 30, 6:39 PM CDT	Flash Flood Warning	JAN	Bolivar, Washington	111 min
Aug 30, 6:50 PM CDT	Special Weather Statement	JAN	Claiborne, Warren	45 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.