Alert archive / Alabama / Flash Flood Warnings in 2010

Flash Flood Warning 4, NWS Mobile, AL

January 20, 2010Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Jan 20, 2010, 11:30 PM CST for Baldwin County, Mobile County, Alabama. It was in force for 2 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
Jan 20, 2010, 11:30 PM CST (05:30 UTC)
Expired
Jan 21, 2010, 1:30 AM CST
In force
2 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Mobile County, AL

The radar

The Mobile radar (KMOB), 31 km from the middle of the area, began a volume at 05:30 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

Eglin AFB/Valpar, FL (KVPS), launched 00:00Z, 5.5 hours before the alert went out and 148 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, Eglin AFB/Valpar, FL at 00:00Z on 2010-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Eglin AFB/Valpar, FL at 00:00Z on 2010-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
626 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
244 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.

347 
WGUS54 KMOB 210530
FFWMOB
ALC003-097-210730-
/O.NEW.KMOB.FF.W.0004.100121T0530Z-100121T0730Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1130 PM CST WED JAN 20 2010

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN BALDWIN COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF BAY MINETTE...
  NORTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...
  THIS INCLUDES THE CITY OF DOWNTOWN MOBILE...

* UNTIL 130 AM CST

* AT 1124 PM CST...NATIONAL WEATHER SERVICE RADAR INDICATED THUNDERSTORMS 
  AND HEAVY RAINFALL CAPABLE OF PRODUCING FLASH FLOODING OVER THE WARNED
  AREA...MOVING EAST AT AROUND 40 MPH. 2 TO 4 INCHES OF RAINFALL...WITH
  SOME LOCALLY HIGHER TOTALS...HAS ALREADY OCCURRED ACROSS PORTIONS OF 
  THE WARNED AREA OVER THE PAST FEW HOURS...AND AN ADDITIONAL 2 INCHES 
  POSSIBLE THROUGH 130 AM CST.    

* THE THUNDERSTORMS PRODUCING VERY THE HEAVY RAIN WILL BE NEAR...
  RABUN AND I65 AND CR 47 BY 1130 PM CST...
  LOTTIE BY 1135 PM CST...
  REDTOWN BY 1140 PM CST...

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

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.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

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 3061 8809 3089 8838 3112 8829 3114 8794
      3128 8773 3123 8763 3087 8763 3068 8794
      3067 8799 3067 8802 3065 8805 3063 8805

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 20, 7:05 PM CSTSpecial Marine WarningMOB55 min
Jan 20, 7:42 PM CSTAreal Flood AdvisoryMOBMobile3 hr
Jan 20, 8:02 PM CSTSpecial Marine WarningMOB58 min
Jan 20, 8:21 PM CSTFlash Flood WarningMOBMobile114 min
Jan 20, 9:29 PM CSTSpecial Marine WarningMOB46 min
Jan 20, 9:30 PM CSTFlash Flood WarningMOBBaldwin2 hr
Jan 20, 9:53 PM CSTSevere Thunderstorm WarningMOBBaldwin52 min
Jan 20, 10:13 PM CSTRiver Flood WarningMOBBaldwin3 days
Jan 20, 10:13 PM CSTRiver Flood WarningMOBBaldwin68 hr
Jan 20, 10:13 PM CSTRiver Flood WarningMOBEscambia26 days
Jan 21, 12:29 AM CSTFlash Flood WarningMOBBaldwin, Escambia6 hr
Jan 21, 2:49 AM CSTTornado WarningMOBBaldwin, Butler, Conecuh, Covington, Escambia, Monroe41 min
Jan 21, 5:33 AM CSTSpecial Marine WarningMOB117 min
Jan 21, 6:31 AM CSTRiver Flood WarningMOBCovington, Escambia62 hr
Jan 21, 9:45 AM CSTRiver Flood WarningMOBEscambia35 hr
Jan 21, 9:45 AM CSTRiver Flood WarningMOBCovington, Escambia49 hr
Jan 21, 9:45 AM CSTRiver Flood WarningMOBCovington26 hr
Jan 21, 9:45 AM CSTRiver Flood WarningMOBEscambia10 hr
Jan 21, 11:29 AM CSTRiver Flood WarningMOBMobile21 hr
Jan 21, 11:29 AM CSTRiver Flood WarningMOBBaldwin24 hr
Jan 21, 5:18 PM CSTDense Fog AdvisoryMOB7 hr
Jan 21, 5:20 PM CSTMarine Dense Fog AdvisoryMOB5 hr

Nearby

Flash Flood Warnings in Alabama, 2010Every flash flood warning in 2010

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.