Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 45, NWS Jackson, MS

April 17, 20125 counties in Mississippi

NWS Jackson, MS issued this flash flood warning at Apr 17, 2012, 1:19 PM CDT for 5 counties in Mississippi. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 17, 2012, 1:19 PM CDT (18:19 UTC)
Expired: Apr 17, 2012, 5:15 PM CDT
In force: 4 hr
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Flood severity: None

Counties Carroll County, MS, Choctaw County, MS, Grenada County, MS, Montgomery County, MS, Webster County, MS

The radar

The Columbus AFB radar (KGWX), 104 km from the middle of the area, began a volume at 18:22 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

Jackson, MS (KJAN), launched 12:00Z, 6.3 hours before the alert went out and 151 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: 157 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 444 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

021 
WGUS54 KJAN 171819
FFWJAN
MSC015-019-043-097-155-172215-
/O.NEW.KJAN.FF.W.0045.120417T1819Z-120417T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
119 PM CDT TUE APR 17 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN CHOCTAW COUNTY IN CENTRAL MISSISSIPPI...
  SOUTHEASTERN CARROLL COUNTY IN NORTH CENTRAL MISSISSIPPI...
  SOUTHEASTERN GRENADA COUNTY IN NORTH CENTRAL MISSISSIPPI...
  MONTGOMERY COUNTY IN NORTH CENTRAL MISSISSIPPI...
  THIS INCLUDES THE CITY OF WINONA...
  WEBSTER COUNTY IN NORTH CENTRAL MISSISSIPPI...

* UNTIL 515 PM CDT

* AT 117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED    
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN MOVING REPEATEDLY NORTH    
  ACROSS THE WARNING AREA. ESTIMATED RADAR RAINFALL AMOUNTS...ON THE 
  ORDER OF TWO TO FOUR INCHES...HAVE OCCURRED IN THE PAST FEW HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SHERWOOD...CUMBERLAND...CLARKSON...BELLEFONTAINE...EMBRY...LODI...
  SWEATMAN...MISTERTON...MATHISTON...KILMICHAEL...EUPORA AND DUCK
  HILL

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

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 3364 8904 3356 8909 3349 8909 3328 8944
      3329 8970 3322 8975 3329 9002 3367 8970
      3373 8956 3373 8920 3375 8919 3374 8903

$$

EEC

1 follow-up statement

238 
WGUS74 KJAN 172101
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
401 PM CDT TUE APR 17 2012

MSC015-019-043-097-155-172215-
/O.CON.KJAN.FF.W.0045.000000T0000Z-120417T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WEBSTER MS-MONTGOMERY MS-GRENADA MS-CHOCTAW MS-CARROLL MS-
401 PM CDT TUE APR 17 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
SOUTHEASTERN CARROLL...NORTHERN CHOCTAW...SOUTHEASTERN GRENADA...
MONTGOMERY AND WEBSTER COUNTIES...

AT 400 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
DETECT THUNDERSTORMS PRODUCING VERY HEAVY RAIN NEAR WINONA. THE 
STORMS WERE MOVING NORTHEAST AT 15 MPH. ESTIMATED RADAR RAINFALL 
AMOUNTS...ON THE ORDER OF TWO TO FOUR INCHES...HAVE OCCURRED IN THE 
PAST THREE HOURS.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SHERWOOD...CUMBERLAND...CLARKSON...BELLEFONTAINE...EMBRY...LODI...
SWEATMAN...MISTERTON...MATHISTON...EUPORA AND DUCK HILL

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...STREAMS...COUNTY ROADS AND FARMLAND ALONG BANKS.

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 3364 8904 3356 8909 3349 8909 3328 8944
      3329 8970 3322 8975 3329 9002 3367 8970
      3373 8956 3373 8920 3375 8919 3374 8903

$$

MRM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 9:54 AM CDT	Flash Flood Warning	JAN	Holmes, Yazoo	4 hr
Apr 17, 10:17 AM CDT	Flash Flood Warning	JAN	Claiborne, Hinds, Madison, Warren	4 hr
Apr 17, 10:32 AM CDT	Flash Flood Warning	JAN	Copiah, Lincoln	3 hr
Apr 17, 12:00 PM CDT	Flash Flood Warning	JAN	Copiah, Jefferson Davis, Lawrence, Rankin, Simpson	3 hr
Apr 17, 1:14 PM CDT	Severe Thunderstorm Warning	JAN	Simpson	35 min
Apr 17, 1:27 PM CDT	Special Weather Statement	JAN	Covington	28 min
Apr 17, 1:35 PM CDT	Special Weather Statement	JAN	Jefferson Davis	30 min
Apr 17, 1:58 PM CDT	River Flood Warning	JAN	Attala, Holmes	68 hr
Apr 17, 2:23 PM CDT	Special Weather Statement	JAN	Covington	32 min
Apr 17, 2:42 PM CDT	Special Weather Statement	JAN	Covington, Lamar	28 min
Apr 17, 3:12 PM CDT	Special Weather Statement	JAN	Forrest, Jones	28 min
Apr 17, 3:37 PM CDT	Special Weather Statement	JAN	Forrest, Jones	28 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.