Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 64, NWS Jackson, MS

June 11, 20124 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at Jun 11, 2012, 6:45 PM CDT for 4 counties in 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: Jun 11, 2012, 6:45 PM CDT (23:45 UTC)
Expired: Jun 11, 2012, 8:45 PM CDT
In force: 2 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

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

The radar

The Jackson/Brandon,MS radar (KDGX), 149 km from the middle of the area, began a volume at 23:49 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
Jun 11, 6:56 PM CDT	FLASH FLOOD	Grenada, MS	STREET FLOODING IN THE CITY OF GRENADA
Jun 11, 7:40 PM CDT	FLASH FLOOD	Indianola, MS	REPORTS OF ROAD CLOSURES DUE TO WATER OVER MULTIPLE ROADS IN THE SOUTHERN PORTIONS OF THE COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 11.8 hours before the alert went out and 141 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: 2451 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 786 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

356 
WGUS54 KJAN 112345
FFWJAN
MSC015-043-083-133-120145-
/O.NEW.KJAN.FF.W.0064.120611T2345Z-120612T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
645 PM CDT MON JUN 11 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
  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...
  SUNFLOWER COUNTY IN NORTHWEST MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...RULEVILLE...MOORHEAD...INDIANOLA...

* UNTIL 845 PM CDT

* AT 644 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  11 MILES NORTHWEST OF HOLCOMB TO 7 MILES SOUTHWEST OF HOLLY        
  RIDGE...MOVING SOUTH AT 35 MPH. ESTIMATED RADAR RAINFALL           
  AMOUNTS...ON THE ORDER OF ONE TO THREE INCHES...HAVE OCCURRED IN   
  THE PAST HOUR OVER PORTIONS OF BOLIVAR AND NORTHERN SUNFLOWER      
  COUNTY ALREADY AFFECTED.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SUNNYSIDE...BEW SPRINGS...MONEY...INVERNESS...LEFLORE...AVALON...
  QUITO...TEOC...SWIFTOWN AND SIDON

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.

RAINFALL AMOUNTS FROM ONE TO THREE INCHES IN A 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 8966 3333 9018 3337 9032 3337 9033
      3334 9028 3324 9037 3333 9046 3327 9056
      3327 9076 3361 9077 3362 9066 3368 9066
      3381 9045 3378 9017 3371 9030 3370 9027
      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
Jun 11, 10:59 AM CDT	Special Weather Statement	JAN	Forrest	31 min
Jun 11, 5:00 PM CDT	Severe Thunderstorm Warning	JAN	Bolivar, Sunflower	75 min
Jun 11, 5:40 PM CDT	Severe Thunderstorm Warning	JAN	Clay, Lowndes, Oktibbeha	65 min
Jun 11, 5:42 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Leflore	63 min
Jun 11, 5:49 PM CDT	Severe Thunderstorm Warning	JAN	Choctaw, Montgomery, Webster	71 min
Jun 11, 5:50 PM CDT	Severe Thunderstorm Warning	JAN	Washington	70 min
Jun 11, 6:12 PM CDT	Severe Thunderstorm Warning	JAN	Humphreys, Leflore, Sunflower	63 min
Jun 11, 6:43 PM CDT	Severe Thunderstorm Warning	JAN	Lowndes, Noxubee, Oktibbeha, Winston	77 min
Jun 11, 6:45 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Holmes, Leflore	75 min
Jun 11, 6:58 PM CDT	Severe Thunderstorm Warning	JAN	Attala, Carroll, Choctaw, Montgomery, Webster	77 min
Jun 11, 6:59 PM CDT	Severe Thunderstorm Warning	JAN	Humphreys, Issaquena, Sharkey, Washington	61 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.