Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 147, NWS Jackson, MS

September 30, 2012Carroll County, Grenada County, Leflore County, Mississippi

NWS Jackson, MS issued this flash flood warning at Sep 30, 2012, 8:55 PM CDT for Carroll County, Grenada County, Leflore County, Mississippi. It was in force for 3 hr. 4 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: Sep 30, 2012, 8:55 PM CDT (01:55 UTC)
Expired: Sep 30, 2012, 11:45 PM CDT
In force: 3 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Carroll County, MS, Grenada County, MS, Leflore County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 151 km from the middle of the area, began a volume at 01:58 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
Sep 30, 10:45 PM CDT	FLASH FLOOD	Greenwood, MS	LEFLORE CD REPORTS WATER IN SEVERAL HOMES IN THE CITY OF GREENWOOD
Sep 30, 10:48 PM CDT	FLASH FLOOD	3 Ssw Greenwood, MS	REPORTS OF WATER ACROSS A COUPLE OF ROADS IN THE RISING SUN COMMUNITY.
Sep 30, 10:48 PM CDT	FLASH FLOOD	Greenwood, MS	REPORTS OF WATER ACROSS JOHN PITTMAN ROAD AND MAIN STREET UNDER AN OVERPASS.
Sep 30, 11:00 PM CDT	FLASH FLOOD	Grenada, MS	KING STREET IN DOWNTOWN IMPASSABLE AND CLOSED DUE TO HIGH WATER

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 00:00Z, 1.9 hours before the alert went out and 146 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: 1160 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 10.6

Open this sounding in Storm Lab

The text

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

500 
WGUS54 KJAN 010155
FFWJAN
MSC015-043-083-010445-
/O.NEW.KJAN.FF.W.0147.121001T0155Z-121001T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF BLACK HAWK...
  WESTERN GRENADA COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF GRENADA...
  LEFLORE COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...ITTA BENA...GREENWOOD...

* UNTIL 1145 PM CDT

* AT 852 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  HEAVY RAIN AND THUNDERSTORMS MOVING NORTH AT 30 MPH INTO THE       
  WARNED AREA. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE ORDER OF    
  ONE TO THREE INCHES...HAVE OCCURRED OVER THE PAST DAY OVER THE     
  ENTIRE AREA. IN ADDITION...NORTHWESTERN PORTIONS OF LEFLORE COUNTY 
  HAVE RECEIVED RAINFALL AMOUNTS UP TO 4 INCHES...WITH AN INCH OR    
  TWO FALLING IN THE PAST FEW HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NORTH
  CARROLLTON...TEOC...MONEY...SUNNYSIDE...AVALON...JEFFERSON...MINTER
  CITY...LEFLORE...HOLCOMB AND BEW SPRINGS

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
THREE HOURS WITH AN ADDITIONAL TWO TO FOUR 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 3387 8965 3367 8978 3352 8978 3326 8990
      3337 9030 3337 9032 3332 9029 3324 9038
      3327 9046 3382 9044 3382 9020 3378 9017
      3374 9030 3371 9030 3370 9027 3374 9024
      3373 9014 3382 9013 3383 8994 3390 8992

$$

BYB

1 follow-up statement

069 
WGUS74 KJAN 010407
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1107 PM CDT SUN SEP 30 2012

MSC015-043-083-010445-
/O.CON.KJAN.FF.W.0147.000000T0000Z-121001T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEFLORE MS-GRENADA MS-CARROLL MS-
1107 PM CDT SUN SEP 30 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR
CARROLL...WESTERN GRENADA AND LEFLORE COUNTIES...

AT 1106 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
DETECT HEAVY RAIN AND A FEW THUNDERSTORMS OVER MUCH OF THE WARNED 
AREA...MOVING NORTH AROUND 30 MPH. ESTIMATED RADAR RAINFALL 
AMOUNTS...ON THE ORDER OF TWO TO FOUR INCHES...HAVE OCCURRED IN THE 
PAST HOUR IN PORTIONS OF THE WARNED AREA. THERE HAVE ALREADY BEEN 
MULTIPLE REPORTS OF FLOODING IN AND AROUND THE GREENWOOD AREA OF 
LEFLORE COUNTY!

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BEW
SPRINGS...HOLCOMB...LEFLORE...JEFFERSON...MINTER CITY...SUNNYSIDE...
MONEY AND GRENADA

HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT HOUR. 
WITH AN ADDITIONAL ONE INCH POSSIBLE.

RAINFALL AMOUNTS FROM ONE TO THREE INCHES IN AN HOUR CAN CAUSE
FLOODING IN THE FOLLOWING AREAS NEAR GREENWOOD: GLENDALE
SUBDIVISION...UNDERPASS ON MAIN STREET...1000 BLOCK OF BROAD
STREET...500 TO 900 BLOCKS OF GRAND BOULEVARD...900 TO 1000 BLOCK OF
STRONG AVENUE 400 BLOCK OF FULTON AND HENRY STREETS AND MITCHELL
STREET IN ITTA BENA.

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 3387 8965 3367 8978 3352 8978 3326 8990
      3337 9030 3337 9032 3332 9029 3324 9038
      3327 9046 3382 9044 3382 9020 3378 9017
      3374 9030 3371 9030 3370 9027 3374 9024
      3373 9014 3382 9013 3383 8994 3390 8992

$$

BYB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 7:37 PM CDT	Flash Flood Warning	JAN	Holmes, Humphreys, Issaquena, Sharkey, Warren, Yazoo	3 hr
Sep 30, 9:22 PM CDT	Areal Flood Warning	JAN	Sunflower, Washington	4 hr
Oct 1, 12:29 AM CDT	Flash Flood Warning	JAN	Attala, Madison	2 hr

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.