Alert archive / Mississippi / Flash Flood Warnings in 2011

Flash Flood Warning 103, NWS Jackson, MS

July 21, 20116 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at Jul 21, 2011, 8:14 AM CDT for 6 counties in Mississippi. It was in force for 3 hr. 1 report 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 21, 2011, 8:14 AM CDT (13:14 UTC)
Expired: Jul 21, 2011, 11:15 AM CDT
In force: 3 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Attala County, MS, Carroll County, MS, Choctaw County, MS, Montgomery County, MS, Oktibbeha County, MS, Webster County, MS

The radar

The Columbus AFB radar (KGWX), 96 km from the middle of the area, began a volume at 13:15 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 21, 9:46 AM CDT	FLASH FLOOD	Starkville, MS	WATER IS BEGINNING TO ACCUMULATE ON ROADS IN THE CITY

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 12:00Z, 1.2 hours before the alert went out and 144 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: 1035 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 964 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: -11 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.

342 
WGUS54 KJAN 211314
FFWJAN
MSC007-015-019-097-105-155-211615-
/O.NEW.KJAN.FF.W.0103.110721T1314Z-110721T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
814 AM CDT THU JUL 21 2011

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ATTALA COUNTY IN CENTRAL MISSISSIPPI...
  CHOCTAW COUNTY IN CENTRAL MISSISSIPPI...
  SOUTHEASTERN CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
  SOUTHERN MONTGOMERY COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF WINONA...
  SOUTHERN WEBSTER COUNTY IN NORTH CENTRAL MISSISSIPPI...
  OKTIBBEHA COUNTY IN NORTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF STARKVILLE...

* UNTIL 1115 AM CDT

* AT 813 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ALONG A LINE EXTENDING FROM
  VAIDEN TO STARKVILLE...MOVING WEST AT 10 MPH. ESTIMATED RADAR      
  RAINFALL AMOUNTS...ON THE ORDER OF ONE TO THREE INCHES...HAVE      
  OCCURRED IN THE PAST THREE HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LONGVIEW...CHESTER...SHERWOOD...REFORM...COILA...MALMAISON...NORTH
  CARROLLTON AND KILMICHAEL

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF HIGHWAYS
AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE
BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO
FLOODING.

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 3329 8874 3328 8874 3329 8910 3323 8911
      3322 8923 3328 8999 3355 9001 3353 8867
      3329 8867

$$

BK

1 follow-up statement

736 
WGUS74 KJAN 211624
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1124 AM CDT THU JUL 21 2011

MSC007-015-019-097-105-155-211631-
/O.EXP.KJAN.FF.W.0103.000000T0000Z-110721T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ATTALA MS-WEBSTER MS-OKTIBBEHA MS-MONTGOMERY MS-CHOCTAW MS-CARROLL MS-
1124 AM CDT THU JUL 21 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHEASTERN CARROLL...
CHOCTAW...SOUTHERN MONTGOMERY...OKTIBBEHA...SOUTHERN WEBSTER AND
NORTHEASTERN ATTALA COUNTIES...

MODERATE RAINFALL CONTINUES ACROSS PORTIONS OF CARROLL AND 
MONTGOMERY COUNTIES...BUT THIS RAIN SHOULD BE EXITING TO THE WEST 
SHORTLY. ANY MAJOR FLOODING ISSUES OCCURRING FROM THIS MORNINGS 
EARLIER HEAVY RAIN APPEAR TO HAVE BEEN ALLEVIATED AND WATER LEVELS 
HAVE RECEDED...THUS THE FLASH FLOODING WARNING HAS BEEN ALLOWED TO 
EXPIRE.

LAT...LON 3329 8874 3328 8874 3329 8910 3323 8911
      3322 8923 3328 8999 3355 9001 3353 8867
      3329 8867

$$

BB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:54 PM CDT	Special Weather Statement	JAN	Yazoo	31 min
Jul 20, 8:58 PM CDT	Special Weather Statement	JAN	Grenada	42 min
Jul 21, 6:13 AM CDT	Flash Flood Warning	JAN	Attala, Choctaw, Oktibbeha, Winston	2 hr
Jul 21, 11:20 AM CDT	Flash Flood Warning	JAN	Scott	115 min
Jul 21, 12:56 PM CDT	Flash Flood Warning	JAN	Madison	61 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.