Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 22, NWS Mobile, AL

September 5, 2018Clarke County, Monroe County, Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 5, 2018, 2:06 AM CDT for Clarke County, Monroe County, Washington County, Alabama. It was in force for 6 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
Sep 5, 2018, 2:06 AM CDT (07:06 UTC)
Expired
Sep 5, 2018, 8:00 AM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Clarke County, AL, Monroe County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 77 km from the middle of the area, began a volume at 07:09 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
Sep 5, 5:00 AM CDTFLASH FLOODWinn, ALWATER OVER THE ROAD NEAR TODDTOWN RD AND HIGHWAY 43 BETWEEN JACKSON AND GROVE HILL.

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 00:00Z, 7.1 hours before the alert went out and 212 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 2018-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 32 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 00:00Z on 2018-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -73 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
32 J/kg
Mixed-layer CIN
-118 J/kg
Mixed-layer LCL
1016 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-73 m²/s²
0-3 km storm-relative helicity
-21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

910 
WGUS54 KMOB 050706
FFWMOB
ALC025-099-129-051300-
/O.NEW.KMOB.FF.W.0022.180905T0706Z-180905T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
206 AM CDT WED SEP 5 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southwestern Monroe County in south central Alabama...
  Eastern Washington County in southwestern Alabama...
  Central Clarke County in southwestern Alabama...

* Until 800 AM CDT.

* At 205 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. One to three inches of rain 
  has fallen. Flash flooding is expected to begin shortly.

Additional rainfall amounts of two to four inches are possible in 
the warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3126 8743 3123 8756 3125 8766 3130 8771
      3130 8779 3127 8779 3128 8783 3123 8784
      3123 8786 3121 8785 3121 8788 3119 8788
      3118 8785 3117 8789 3115 8787 3116 8793
      3114 8794 3117 8799 3170 8837 3170 8780

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 8:24 PM CDTFlash Flood WarningMOBBaldwin12 hr
Sep 4, 8:24 PM CDTRiver Flood WarningMOBBaldwin40 hr
Sep 4, 8:31 PM CDTRiver Flood WarningMOBBaldwin4 days
Sep 4, 8:32 PM CDTRiver Flood WarningMOBBaldwin70 hr
Sep 4, 9:00 PM CDTFlash Flood WarningMOBMobile6 hr
Sep 4, 10:45 PM CDTFlash Flood WarningMOBBaldwin, Escambia12 hr
Sep 5, 12:53 AM CDTTornado WarningMOBBaldwin25 min
Sep 5, 3:19 AM CDTSpecial Marine WarningMOB26 min
Sep 5, 3:32 AM CDTSpecial Marine WarningMOB28 min
Sep 5, 4:30 AM CDTFlash Flood WarningMOBChoctaw, Clarke6 hr
Sep 5, 4:57 AM CDTSmall Craft AdvisoryMOB5 hr
Sep 5, 5:15 AM CDTCoastal Flood AdvisoryMOBBaldwin, Mobile9 hr
Sep 5, 5:15 AM CDTHigh Surf AdvisoryMOBBaldwin, Mobile9 hr
Sep 5, 7:54 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more6 hr
Sep 5, 8:06 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Monroe, Washington6 hr
Sep 5, 9:06 AM CDTFlash Flood WarningMOBClarke, Conecuh, Monroe, Wilcox6 hr
Sep 5, 9:35 AM CDTSpecial Marine WarningMOB115 min
Sep 5, 10:25 AM CDTFlash Flood WarningMOBChoctaw, Clarke5 hr
Sep 5, 12:53 PM CDTAreal Flood AdvisoryMOBMobile52 min
Sep 5, 1:50 PM CDTAreal Flood WarningMOBBaldwin, Escambia6 hr

Nearby

Flash Flood Warnings in Alabama, 2018Every flash flood warning in 2018

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.