Alert archive / Mississippi / Flash Flood Warnings in 2011

Flash Flood Warning 19, NWS Mobile, AL

April 15, 2011Greene County, Perry County, Mississippi; Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 15, 2011, 9:18 PM CDT for Greene County, Perry County, Mississippi; Washington County, Alabama. It was in force for 117 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
Apr 15, 2011, 9:18 PM CDT (02:18 UTC)
Expired
Apr 15, 2011, 11:15 PM CDT
In force
117 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Washington County, AL, Greene County, MS, Perry County, MS

The radar

The Mobile radar (KMOB), 75 km from the middle of the area, began a volume at 02:21 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.3 hours before the alert went out and 185 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 2011-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2774 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 267 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2774 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
697 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
267 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
5.3
Supercell composite
18.2

Open this sounding in Storm Lab

The text

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

526 
WGUS54 KMOB 160218
FFWMOB
ALC129-MSC041-111-160415-
/O.NEW.KMOB.FF.W.0019.110416T0218Z-110416T0415Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
918 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GREENE COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF LEAKESVILLE...
  PERRY COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF RICHTON...
  WASHINGTON COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF CHATOM...

* UNTIL 1115 PM CDT

* AT 907 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUES TO        
  INDICATE VERY HEAVY RAIN FROM THUNDERSTORMS MOVING INTO THE 
  WARNED AREA FROM THE WEST. 

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR BY AUTOMOBILE.

TO REPORT FLASH FLOODING TO YOUR NATIONAL WEATHER SERVICE...CALL TOLL
FREE AT 1 8 7 7 6 3 3 6 7 7 2.

LAT...LON 3130 8914 3144 8868 3144 8845 3151 8846
      3161 8812 3143 8791 3141 8792 3141 8790
      3136 8789 3133 8791 3134 8792 3132 8792
      3132 8795 3130 8794 3128 8796 3092 8912

$$

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 15, 7:14 PM CDTTornado WarningMOBGreene36 min
Apr 15, 7:24 PM CDTTornado Warning EmergencyMOBGreene, Perry51 min
Apr 15, 7:53 PM CDTTornado WarningMOBGreene, Perry37 min
Apr 15, 8:28 PM CDTTornado WarningMOBGreene47 min
Apr 15, 8:36 PM CDTTornado WarningMOBGreene, Perry54 min
Apr 15, 8:42 PM CDTTornado WarningMOBGeorge, Greene, Perry63 min
Apr 15, 9:15 PM CDTSevere Thunderstorm WarningMOBGeorge, Greene, Perry, Stone45 min
Apr 15, 9:59 PM CDTSevere Thunderstorm WarningMOBGeorge, Greene61 min
Apr 15, 7:36 PM CDTSevere Thunderstorm WarningMOBWilcox39 min
Apr 15, 7:39 PM CDTTornado WarningMOBClarke, Monroe, Wilcox29 min
Apr 15, 7:54 PM CDTTornado WarningMOBClarke, Monroe, Wilcox51 min
Apr 15, 8:11 PM CDTTornado Warning EmergencyMOBWashington49 min
Apr 15, 8:50 PM CDTTornado WarningMOBBaldwin, Clarke, Escambia, Mobile, Monroe, Washington55 min
Apr 15, 9:38 PM CDTTornado WarningMOBConecuh, Monroe52 min
Apr 15, 9:41 PM CDTTornado WarningMOBClarke, Washington49 min
Apr 15, 10:05 PM CDTTornado WarningMOBBaldwin, Clarke, Mobile, Monroe, Washington55 min
Apr 15, 10:24 PM CDTTornado WarningMOBButler, Clarke, Conecuh, Monroe, Wilcox51 min
Apr 15, 10:32 PM CDTTornado WarningMOBBaldwin, Mobile33 min
Apr 15, 10:56 PM CDTSevere Thunderstorm WarningMOBBaldwin, Conecuh, Escambia, Mobile, Monroe64 min
Apr 15, 10:59 PM CDTTornado WarningMOBBaldwin, Conecuh, Escambia, Monroe61 min
Apr 15, 11:10 PM CDTTornado WarningMOBButler, Crenshaw16 min
Apr 15, 11:33 PM CDTSevere Thunderstorm WarningMOBButler, Crenshaw42 min
Apr 15, 11:45 PM CDTTornado WarningMOBConecuh, Covington, Escambia60 min
Apr 16, 12:00 AM CDTSevere Thunderstorm WarningMOBButler, Conecuh, Covington, Crenshaw60 min
Apr 16, 12:11 AM CDTSevere Thunderstorm WarningMOBCrenshaw32 min
Apr 16, 12:38 AM CDTTornado WarningMOBCovington52 min
Apr 16, 1:01 AM CDTSevere Thunderstorm WarningMOBCovington33 min

Nearby

Flash Flood Warnings in Mississippi, 2011Flash Flood Warnings in Alabama, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.