Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 149, NWS Jackson, MS

December 4, 2012Carroll County, Grenada County, Mississippi

NWS Jackson, MS issued this flash flood warning at Dec 4, 2012, 3:11 PM CST for Carroll County, Grenada County, Mississippi. It was in force for 103 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: Dec 4, 2012, 3:11 PM CST (21:11 UTC)
Expired: Dec 4, 2012, 4:54 PM CST
In force: 103 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Carroll County, MS, Grenada County, MS

The radar

The Columbus AFB radar (KGWX), 136 km from the middle of the area, began a volume at 21:12 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

Little Rock, AR (KLZK), launched 12:00Z, 9.2 hours before the alert went out and 119 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: 835 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 489 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

901 
WGUS54 KJAN 042111
FFWJAN
MSC015-043-042315-
/O.NEW.KJAN.FF.W.0149.121204T2111Z-121204T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
311 PM CST TUE DEC 4 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
  GRENADA COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF GRENADA...

* UNTIL 515 PM CST

* AT 311 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  9 MILES NORTHEAST OF GORE SPRINGS TO AVALON...OR ALONG A LINE
  EXTENDING FROM 18 MILES EAST OF GRENADA TO 11 MILES NORTHEAST OF
  GREENWOOD...MOVING EAST AT 5 MPH. ESTIMATED RADAR RAINFALL
  AMOUNTS...ON THE ORDER OF ONE TO THREE INCHES...HAVE OCCURRED IN
  THE PAST HOUR.

* THE STORMS PRODUCING THUNDERSTORMS PRODUCING VERY HEAVY RAIN WILL
  OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED
  COUNTIES.

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

RAINFALL AMOUNTS FROM ONE TO THREE INCHES A HOUR CAN CAUSE FLOODING
ON ROADS IN AND AROUND THE CITY OF GRENADA...INCLUDING MONROE STREET
AT FAIRGROUND ROAD...VAN DORN BETWEEN COMMERCE AND POPLAR STREETS...
MOUND STREET AT JEFFERSON STREET...PEARL AT LYNCH STREET AND COUNTRY
CLUB ROAD JUST SOUTH OF EAST MONROE STREET.

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 3386 8950 3377 8950 3361 9011 3365 9010
      3368 9013 3373 9014 3388 8963 3387 8951

$$

BYB

1 follow-up statement

829 
WGUS74 KJAN 042254
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
454 PM CST TUE DEC 4 2012

MSC015-043-042303-
/O.CAN.KJAN.FF.W.0149.000000T0000Z-121204T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRENADA MS-CARROLL MS-
454 PM CST TUE DEC 4 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
CARROLL AND GRENADA COUNTIES...

PREVIOUSLY FLOODED ROADS AROUND THE CITY OF GRENADA ARE NO LONGER 
FLOODED AND HEAVY RAIN ENDED A WHILE AGO. NO FURTHER HEAVY RAIN IS
ANTICIPATED AT THIS TIME. 

LAT...LON 3386 8950 3377 8950 3361 9011 3365 9010
      3368 9013 3373 9014 3388 8963 3387 8951

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 4, 2:39 PM CST	Special Weather Statement	JAN	Grenada	46 min
Dec 4, 3:18 PM CST	Special Weather Statement	JAN	Washington	32 min
Dec 4, 3:20 PM CST	Special Weather Statement	JAN	Issaquena	45 min
Dec 4, 3:36 PM CST	Special Weather Statement	JAN	Leflore	29 min
Dec 4, 4:24 PM CST	Special Weather Statement	JAN	Carroll	46 min
Dec 4, 4:26 PM CST	Special Weather Statement	JAN	Washington	44 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.