Alert archive / Mississippi / Flash Flood Warnings in 2011

Flash Flood Warning 112, NWS Jackson, MS

July 24, 2011Forrest County, Lamar County, Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 24, 2011, 12:00 PM CDT for Forrest County, Lamar County, Mississippi. It was in force for 2 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: Jul 24, 2011, 12:00 PM CDT (17:00 UTC)
Expired: Jul 24, 2011, 2:00 PM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Forrest County, MS, Lamar County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 125 km from the middle of the area, began a volume at 17:00 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 24, 12:21 PM CDT	HEAVY RAIN 0	West Hattiesburg, MS	ROOF COLLAPSE OF A BUILDING BEING REMODELED IN THE TURTLE CREEK MALL AREA.
Jul 24, 12:40 PM CDT	FLASH FLOOD	Hattiesburg, MS	LAW ENFORCEMENT OFFICER REPORTS STREET FLOODING AT THE INTERSECTION OF US HIGHWAY 49 AND 4TH STREET AT THE NORTHEAST CORNER OF THE USM CAMPUS. ESTIMATES 12 TO 18 INCHES OF WATER COVERING THE ROAD.

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, 5.0 hours before the alert went out and 120 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: 2135 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 587 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

003 
WGUS54 KJAN 241700
FFWJAN
MSC035-073-241900-
/O.NEW.KJAN.FF.W.0112.110724T1700Z-110724T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1200 PM CDT SUN JUL 24 2011

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN FORREST COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...PETAL...HATTIESBURG...
  NORTHEASTERN LAMAR COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF WEST HATTIESBURG...

* UNTIL 200 PM CDT

* AT 1159 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED   
   AN AREA OF HEAVY RAIN WITH EMBEDDED THUNDERSTORMS ALONG A LINE    
   FROM JUST SOUTH OF SUMRALL TO HATTIESBURG...MOVING EAST AT 5 MPH. 
   ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF ONE TO THREE   
   INCHES...HAVE OCCURRED IN THE PAST HOUR.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  EASTABUCHIE...SUNRISE AND MACEDONIA

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 3126 8954 3143 8953 3143 8915 3119 8914
      3119 8927

$$

JC

1 follow-up statement

882 
WGUS74 KJAN 241833
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
133 PM CDT SUN JUL 24 2011

MSC035-073-241900-
/O.CON.KJAN.FF.W.0112.000000T0000Z-110724T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAMAR MS-FORREST MS-
133 PM CDT SUN JUL 24 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR
NORTHERN FORREST AND NORTHEASTERN LAMAR COUNTIES...

AT 133 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR RAWLS SPRINGS...
OR 8 MILES NORTHWEST OF WEST HATTIESBURG...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.

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT 
30 MINUTES TO AN 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 3126 8954 3143 8953 3143 8915 3119 8914
      3119 8927

$$

JC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 9:05 AM CDT	Flash Flood Warning	JAN	Clarke, Jasper, Lauderdale, Newton	115 min
Jul 24, 10:38 AM CDT	Flash Flood Warning	JAN	Kemper	112 min
Jul 24, 10:57 AM CDT	Flash Flood Warning	JAN	Lauderdale	108 min
Jul 24, 11:47 AM CDT	Special Weather Statement	JAN	Forrest	43 min
Jul 24, 1:21 PM CDT	Special Weather Statement	JAN	Jones	39 min
Jul 24, 1:45 PM CDT	Special Weather Statement	JAN	Lamar	40 min
Jul 24, 2:01 PM CDT	Special Weather Statement	JAN	Clay	29 min
Jul 24, 2:37 PM CDT	Flash Flood Warning	JAN	Covington, Jefferson Davis, Lamar, Marion	113 min
Jul 24, 2:42 PM CDT	Special Weather Statement	JAN	Humphreys	43 min
Jul 24, 3:54 PM CDT	Special Weather Statement	JAN	Lawrence	26 min
Jul 24, 5:01 PM CDT	Special Weather Statement	JAN	Madison	44 min
Jul 24, 5:16 PM CDT	Special Weather Statement	JAN	Choctaw	44 min
Jul 24, 5:37 PM CDT	Flash Flood Warning	JAN	Choctaw, Winston	66 min
Jul 24, 6:20 PM CDT	Special Weather Statement	JAN	Montgomery	40 min
Jul 24, 6:58 PM CDT	Flash Flood Warning	JAN	Montgomery	82 min

Nearby

Flash Flood Warnings in Mississippi, 2011 Every flash flood warning in 2011

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.