Alert archive / Alabama / Flash Flood Warnings in 2009

Flash Flood Warning 35, NWS Mobile, AL

May 23, 2009Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at May 23, 2009, 8:35 AM CDT for Mobile County, Alabama. It was in force for 5 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
May 23, 2009, 8:35 AM CDT (13:35 UTC)
Expired
May 23, 2009, 1:28 PM CDT
In force
5 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 40 km from the middle of the area, began a volume at 13:39 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

TimeReportWhereRemark
May 23, 10:30 AM CDTFLASH FLOODBayou La Batre, ALFLOODING AND FLASH FLOODING ALONG HWY 188 IN BAYOU LA BATRE.

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.6 hours before the alert went out and 143 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 12:00Z on 2009-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 680 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2009-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 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
680 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
455 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
8 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.

000 
WGUS54 KMOB 231335
FFWMOB
ALC097-231930-
/O.NEW.KMOB.FF.W.0035.090523T1335Z-090523T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
835 AM CDT SAT MAY 23 2009

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF DAUPHIN ISLAND...

* UNTIL 230 PM CDT

* AT 830 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM NUMEROUS SHOWERS AND THUNDERSTORM MOVING
  NORTHWARD OVER THE WARNED AREA.  AS THE HEAVIEST RAINFALL
  CONTINUES TO MOVE ONSHORE OVER SOUTHERN MOBILE COUNTY...ADDITIONAL
  RAINFALL AMOUNTS OF UP TO 6 INCHES WILL BE POSSIBLE OVER THE
  WARNED AREA WHICH WILL RESULT IN FLASH FLOODING OVER SOUTHERN
  MOBILE COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAINT
  ELMO...SOUTH ORCHARD...MON LOUIS...LAURENDINE...IRVINGTON...DIXON
  CORNER...DELCHAMPS...BELLEFONTAINE AND BAYOU LA BATRE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3025 8814 3022 8831 3024 8832 3027 8813
      3033 8815 3033 8826 3036 8820 3038 8839
      3023 8837 3046 8841 3055 8812 3048 8809
      3031 8813 3025 8807 3022 8810

$$
2 follow-up statements
000 
WGUS74 KMOB 231554
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1054 AM CDT SAT MAY 23 2009

ALC097-231930-
/O.CON.KMOB.FF.W.0035.000000T0000Z-090523T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOBILE AL-
1054 AM CDT SAT MAY 23 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR
SOUTHWESTERN MOBILE COUNTY...

AT 1052 AM CDT...ALTHOUGH THE RAINS HAVE ESSENTIALLY ENDED OVER 
SOUTHERN MOBILE COUNTY...REPORTS INDICATE THAT FLOODED ROADWAYS 
PERSIST ESPECIALLY OVER THE WEST END OF DAUPHIN ISLAND AND IN BAYOU 
LA BATRE.  THE FLASH FLOOD WARNING WILL CONTINUE IN EFFECT AS THESE 
AREAS AND OTHER AREAS PRONE TO FLOODING WILL CONTINUE TO SLOWLY 
DRAIN.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAINT ELMO...
SOUTH ORCHARD...MON LOUIS...LAURENDINE...IRVINGTON...GRAND BAY...
DIXON CORNER...DELCHAMPS...BELLEFONTAINE AND BAYOU LA BATRE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 3025 8814 3022 8831 3024 8832 3027 8813
      3033 8815 3033 8826 3036 8820 3038 8839
      3023 8837 3046 8841 3055 8812 3048 8809
      3031 8813 3025 8807 3022 8810

$$
000 
WGUS74 KMOB 231828
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
128 PM CDT SAT MAY 23 2009

ALC097-231837-
/O.CAN.KMOB.FF.W.0035.000000T0000Z-090523T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOBILE AL-
128 PM CDT SAT MAY 23 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN MOBILE
COUNTY...

AT 127 PM CDT...REPORTS ACROSS SOUTHWESTERN MOBILE COUNTY INDICATES 
THAT THE WATER HAS RECEDED FROM ALL OF THE FLOODED ROADWAYS...THUS 
THE FLASH FLOOD WARNING HAS BEEN CANCELED.

LAT...LON 3025 8814 3022 8831 3024 8832 3027 8813
      3033 8815 3033 8826 3036 8820 3038 8839
      3023 8837 3046 8841 3055 8812 3048 8809
      3031 8813 3025 8807 3022 8810

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 22, 11:04 PM CDTCoastal Flood StatementMOB16 hr
May 22, 11:11 PM CDTSpecial Marine WarningMOB94 min
May 23, 12:39 AM CDTSpecial Marine WarningMOB2 hr
May 23, 2:30 AM CDTSpecial Marine WarningMOB2 hr
May 23, 3:53 AM CDTFlash Flood WatchMOBWashington15 hr
May 23, 5:19 AM CDTSpecial Marine WarningMOB116 min
May 23, 7:40 AM CDTAreal Flood AdvisoryMOBMobile3 hr
May 23, 8:25 AM CDTCoastal Flood WarningMOB5 hr
May 23, 8:44 AM CDTSevere Thunderstorm WarningMOBMobile31 min
May 23, 8:46 AM CDTSpecial Marine WarningMOB89 min
May 23, 9:00 AM CDTSpecial Marine WarningMOB90 min
May 23, 9:14 AM CDTSpecial Marine WarningMOB31 min
May 23, 9:17 AM CDTSpecial Marine WarningMOB43 min
May 23, 10:11 AM CDTWind AdvisoryMOBWashington5 hr
May 23, 10:49 AM CDTSpecial Marine WarningMOB26 min

Nearby

Flash Flood Warnings in Alabama, 2009Every flash flood warning in 2009

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.