Alert archive / Mississippi / Flash Flood Warnings in 2011

Flash Flood Warning 28, NWS Mobile, AL

September 4, 2011Stone County, Mississippi

NWS Mobile, AL issued this flash flood warning at Sep 4, 2011, 1:09 AM CDT for Stone County, Mississippi. It was in force for 3 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
Sep 4, 2011, 1:09 AM CDT (06:09 UTC)
Expired
Sep 4, 2011, 4:15 AM CDT
In force
3 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Stone County, MS

The radar

The Mobile radar (KMOB), 99 km from the middle of the area, began a volume at 06:11 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, 6.2 hours before the alert went out and 67 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 2011-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1081 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2011-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 square meters per square second.193958Sfc1 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
1081 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
495 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
154 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.

497 
WGUS54 KMOB 040609
FFWMOB
MSC131-040915-
/O.NEW.KMOB.FF.W.0028.110904T0609Z-110904T0915Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
109 AM CDT SUN SEP 4 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN STONE COUNTY IN SOUTHEAST MISSISSIPPI...
  THIS INCLUDES THE CITY OF WIGGINS...

* UNTIL 415 AM CDT

* AT 102 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
  RAIN FROM A SERIES OF THUNDERSTORMS MOVING NORTHWARD ACROSS
  WESTERN STONE COUNTY.  THESE STORMS ARE PRODUCING 1 TO 2 INCHES
  OF RAIN OVER AN HOUR AND THIS IS FALLING ON TOTALLY SATURATED
  GROUND.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PERKINSTON

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

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 3066 8935 3066 8934 3091 8935 3092 8934
      3091 8914 3067 8907 3067 8923 3065 8924
      3064 8924 3064 8934

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 3, 7:53 PM CDTAreal Flood WarningMOBGeorge, Greene, Perry, Stone6 hr
Sep 4, 12:59 AM CDTTornado WarningMOBGeorge61 min
Sep 4, 3:10 AM CDTTornado WarningMOBGeorge50 min
Sep 4, 8:40 AM CDTTornado WarningMOBGreene, Perry35 min
Sep 4, 9:14 AM CDTTornado WarningMOBPerry, Wayne46 min
Sep 4, 9:54 AM CDTRiver Flood WarningMOBGeorge, Greene, Wayne25 hr
Sep 4, 11:13 AM CDTTornado WarningMOBPerry62 min
Sep 4, 11:19 AM CDTTornado WarningMOBGreene, Perry56 min
Sep 4, 11:41 AM CDTTornado WarningMOBGreene, Wayne64 min
Sep 4, 12:19 PM CDTTornado WarningMOBGreene56 min
Sep 4, 1:18 PM CDTTornado WarningMOBWayne42 min
Sep 4, 1:22 PM CDTFlash Flood WarningMOBWayne3 hr
Sep 4, 1:57 PM CDTFlash Flood WarningMOBGeorge, Greene3 hr
Sep 4, 2:01 PM CDTTornado WarningMOBWayne59 min

Nearby

Flash Flood Warnings in Mississippi, 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.