Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 26, NWS Mobile, AL

September 5, 20184 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Sep 5, 2018, 9:06 AM CDT for 4 counties in Alabama. It was in force for 6 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 5, 2018, 9:06 AM CDT (14:06 UTC)
Expired
Sep 5, 2018, 3:00 PM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Clarke County, AL, Conecuh County, AL, Monroe County, AL, Wilcox County, AL

The radar

The Birmingham radar (KBMX), 141 km from the middle of the area, began a volume at 14:05 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

Birmingham, AL (KBMX), launched 12:00Z, 2.1 hours before the alert went out and 142 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, Birmingham, AL at 12:00Z on 2018-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 303 joules per kilogram.LCLLFCEL10008507005003002001001 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, Birmingham, AL at 12:00Z on 2018-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 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
303 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
693 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

470 
WGUS54 KMOB 051406
FFWMOB
ALC025-035-099-131-052000-
/O.NEW.KMOB.FF.W.0026.180905T1406Z-180905T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Monroe County in south central Alabama...
  Northeastern Clarke County in southwestern Alabama...
  Wilcox County in south central Alabama...
  Conecuh County in south central Alabama...

* Until 300 PM CDT.

* At 906 AM CDT, Doppler radar indicated heavy rain across the warned
  area. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Monroeville, Thomasville, Evergreen, Camden, Frisco City, Peterman,
  Uriah, Pine Hill, Castleberry, Excel, Beatrice, Vredenburgh,
  Fulton, Repton, Yellow Bluff, Pine Apple, I65 And US 84, Shawnee
  and Dannelly Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3220 8736 3220 8733 3214 8728 3214 8725
      3212 8726 3208 8719 3205 8718 3205 8686
      3196 8686 3196 8691 3162 8690 3126 8694
      3127 8749 3170 8773 3199 8781 3200 8763
      3213 8762 3213 8752 3226 8752 3227 8745

$$
1 follow-up statement
356 
WGUS74 KMOB 051655
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1155 AM CDT WED SEP 5 2018

ALC025-035-099-131-052000-
/O.CON.KMOB.FF.W.0026.000000T0000Z-180905T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe AL-Clarke AL-Wilcox AL-Conecuh AL-
1155 AM CDT WED SEP 5 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM CDT FOR
MONROE...NORTHEASTERN CLARKE...WILCOX AND CONECUH COUNTIES...

At 1154 AM CDT, Doppler radar indicated heavy rain across the warned
area.  Flash flooding is expected to begin shortly.

Some locations that will experience flooding include...
Monroeville, Thomasville, Evergreen, Camden, Frisco City, Peterman,
Uriah, Pine Hill, Castleberry, Excel, Beatrice, Vredenburgh, Fulton,
Repton, Yellow Bluff, Pine Apple, I65 And US 84, Shawnee and Dannelly
Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3220 8736 3220 8733 3214 8728 3214 8725
      3212 8726 3208 8719 3205 8718 3205 8686
      3196 8686 3196 8691 3162 8690 3126 8694
      3127 8749 3170 8773 3199 8781 3200 8763
      3213 8762 3213 8752 3226 8752 3227 8745

$$

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, 2:06 AM CDTFlash Flood WarningMOBClarke, Monroe, Washington6 hr
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, 9:35 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.