Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 145, NWS Jackson, MS

September 30, 2012Forrest County, Lamar County, Mississippi

NWS Jackson, MS issued this flash flood warning at Sep 30, 2012, 6:33 PM CDT for Forrest County, Lamar County, Mississippi. It was in force for 66 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: Sep 30, 2012, 6:33 PM CDT (23:33 UTC)
Expired: Sep 30, 2012, 7:39 PM CDT
In force: 66 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Forrest County, MS, Lamar County, MS

The radar

The Mobile radar (KMOB), 109 km from the middle of the area, began a volume at 23:34 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.6 hours before the alert went out and 96 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: 1360 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

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

283 
WGUS54 KJAN 302333
FFWJAN
MSC035-073-010130-
/O.NEW.KJAN.FF.W.0145.120930T2333Z-121001T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
633 PM CDT SUN SEP 30 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FORREST COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...PETAL...HATTIESBURG...
  SOUTHEASTERN LAMAR COUNTY IN SOUTHEAST MISSISSIPPI...

* UNTIL 830 PM CDT

* AT 630 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR ROCK HILL...OR 17
  MILES NORTHEAST OF POPLARVILLE...MOVING NORTHEAST AT 35 MPH.
  ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF ONE TO THREE    
  INCHES...HAVE OCCURRED IN THE PAST THREE HOURS OVER PORTIONS OF    
  SOUTHEASTERN FORREST COUNTY. IN ADDITION...SINCE YESTERDAY         
  AFTERNOON MUCH OF THE WARNED AREA HAS RECEIVED BETWEEN 3 AND 5     
  INCHES OF RAIN.

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

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

RAINFALL AMOUNTS FROM TWO TO FOUR INCHES IN A HOUR CAN CAUSE FLOODING
IN AND AROUND THE WESTERN PORTIONS OF HATTIESBURG IN NORTHEAST LAMAR
COUNTY. SOME OF THE ROADS THAT FLOOD WITH THIS AMOUNT OF RAINFALL
INCLUDE SAM RAYBURN ROAD...CLEARANCE RAY DRIVE...RUBY CIRCLE AND
RAYBURN PLACE. IN ADDITION TO MANY OTHER LOCATIONS ALONG MIXON CREEK
BEHIND TURTLE CREEK MALL.

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 3100 8935 3100 8941 3098 8943 3097 8947
      3102 8951 3143 8932 3144 8914 3101 8914
      3100 8913 3091 8913 3090 8914 3091 8934

$$

BYB

1 follow-up statement

718 
WGUS74 KJAN 010039
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
739 PM CDT SUN SEP 30 2012

MSC035-073-010049-
/O.CAN.KJAN.FF.W.0145.000000T0000Z-121001T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAMAR MS-FORREST MS-
739 PM CDT SUN SEP 30 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR FORREST AND
SOUTHEASTERN LAMAR COUNTIES...

SHOWERS CONTINUE IN THE PREVIOUSLY WARNED AREA BUT RAINFALL RATES
AT THIS TIME ARE NOT EXPECTED TO BE HEAVY ENOUGH TO PRODUCE FLASH 
FLOODING.

LAT...LON 3100 8935 3100 8941 3098 8943 3097 8947
      3102 8951 3143 8932 3144 8914 3101 8914
      3100 8913 3091 8913 3090 8914 3091 8934

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 7:00 PM CDT	Flash Flood Warning	JAN	Franklin, Lincoln	2 hr
Sep 30, 4:19 PM CDT	Special Weather Statement	JAN	Carroll, Holmes, Humphreys, Leflore, Sharkey, Sunflower and 1 more	71 min
Sep 30, 5:52 PM CDT	Special Weather Statement	JAN	Lamar	28 min
Sep 30, 6:10 PM CDT	Flash Flood Warning	JAN	Leflore, Sunflower, Washington	3 hr
Sep 30, 6:50 PM CDT	Special Weather Statement	JAN	Carroll, Grenada, Holmes, Humphreys, Issaquena, Leflore and 5 more	75 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; radar from the NEXRAD Level II archive.