Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 70, NWS Mobile, AL

August 30, 20214 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Aug 30, 2021, 11:57 AM CDT for 4 counties in Alabama. It was in force for 5 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
Aug 30, 2021, 11:57 AM CDT (16:57 UTC)
Expired
Aug 30, 2021, 4:31 PM CDT
In force
5 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 79 km from the middle of the area, began a volume at 17:01 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 12:00Z, 5.0 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 12:00Z on 2021-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 881 joules per kilogram.LCLEL10008507005003002001001 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 2021-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 386 square meters per square second.19395878Sfc1 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
881 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
560 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
386 m²/s²
0-3 km storm-relative helicity
386 m²/s²
Significant tornado parameter
1.1
Supercell composite
9.7

Open this sounding in Storm Lab

The text

As transmitted.

545 
WGUS54 KMOB 301657
FFWMOB
ALC003-025-097-129-302300-
/O.NEW.KMOB.FF.W.0070.210830T1657Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
1157 AM CDT Mon Aug 30 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northwestern Baldwin County in southwestern Alabama...
  South Central Clarke County in southwestern Alabama...
  Northeastern Mobile County in southwestern Alabama...
  Southeastern Washington County in southwestern Alabama...

* Until 600 PM CDT Monday.

* At 1157 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Citronelle, Wagarville, Tibbie, Calvert, Mount Vernon, McIntosh, 
  Movico, Malcolm, Fairford, Toinette, Fort Stoddard, Chestang, 
  Hawthorn, Sims Chapel, Topton, Sunflower, Blacksher, Chastang, 
  Carlton and Cortelyou.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3144 8830 3145 8775 3134 8772 3133 8775
      3136 8775 3136 8776 3135 8777 3133 8778
      3132 8778 3130 8778 3130 8776 3130 8772
      3102 8765 3100 8831

FLASH FLOOD...RADAR INDICATED

$$
2 follow-up statements
068 
WGUS74 KMOB 301826
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
126 PM CDT Mon Aug 30 2021

ALC003-025-097-129-302300-
/O.CON.KMOB.FF.W.0070.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Clarke AL-Mobile AL-Washington AL-
126 PM CDT Mon Aug 30 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM CDT THIS EVENING 
FOR NORTHWESTERN BALDWIN, SOUTH CENTRAL CLARKE, NORTHEASTERN MOBILE 
AND SOUTHEASTERN WASHINGTON COUNTIES...

At 126 PM CDT, Doppler radar indicated thunderstorms had produced 
heavy rain of 2 to 4 inches across the warned area. Flash flooding 
is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Citronelle, Wagarville, Tibbie, Calvert, Mount Vernon, McIntosh, 
  Movico, Malcolm, Fairford, Toinette, Fort Stoddard, Chestang, 
  Hawthorn, Sims Chapel, Topton, Sunflower, Blacksher, Chastang, 
  Carlton and Cortelyou.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3144 8830 3145 8775 3134 8772 3133 8775
      3136 8775 3136 8776 3135 8777 3133 8778
      3132 8778 3130 8778 3130 8776 3130 8772
      3102 8765 3100 8831

FLASH FLOOD...RADAR INDICATED

$$
162 
WGUS74 KMOB 302131
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
431 PM CDT Mon Aug 30 2021

ALC003-025-097-129-302141-
/O.CAN.KMOB.FF.W.0070.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Clarke AL-Mobile AL-Washington AL-
431 PM CDT Mon Aug 30 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BALDWIN, SOUTH 
CENTRAL CLARKE, NORTHEASTERN MOBILE AND SOUTHEASTERN WASHINGTON 
COUNTIES...
...AN AREAL FLOOD WARNING REMAINS IN EFFECT FOR THE AREA...

Flooding has transitioned to area flooding as flood waters drain. 
Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1200 PM CDT Tuesday for 
Portions of Alabama. Portions of northwest Florida.

LAT...LON 3144 8830 3145 8775 3134 8772 3133 8775
      3136 8775 3136 8776 3135 8777 3133 8778
      3132 8778 3130 8778 3130 8776 3130 8772
      3102 8765 3100 8831

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 7:07 PM CDTTornado WarningMOBMobile25 min
Aug 29, 8:19 PM CDTRiver Flood WarningMOBEscambia49 hr
Aug 29, 8:21 PM CDTRiver Flood WarningMOBCovington, Escambia38 hr
Aug 29, 8:35 PM CDTRiver Flood WarningMOBBaldwin30 hr
Aug 29, 11:27 PM CDTSpecial Marine WarningMOB93 min
Aug 30, 12:13 AM CDTSpecial Marine WarningMOB47 min
Aug 30, 12:59 AM CDTSpecial Marine WarningMOB2 hr
Aug 30, 3:24 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Mobile, Washington6 hr
Aug 30, 4:03 AM CDTSpecial Marine WarningMOB117 min
Aug 30, 6:42 AM CDTFlash Flood WarningMOBBaldwin, Escambia5 hr
Aug 30, 6:46 AM CDTSpecial Marine WarningMOB119 min
Aug 30, 8:29 AM CDTFlash Flood WarningMOBConecuh, Escambia, Monroe4 hr
Aug 30, 8:32 AM CDTFlash Flood WarningMOBEscambia4 hr
Aug 30, 8:40 AM CDTTornado WarningMOBConecuh, Escambia50 min
Aug 30, 9:00 AM CDTFlash Flood WarningMOBClarke, Conecuh, Escambia, Monroe, Wilcox4 hr
Aug 30, 9:12 AM CDTFlash Flood WarningMOBConecuh, Escambia4 hr
Aug 30, 9:20 AM CDTAreal Flood WarningMOBBaldwin, Clarke, Mobile, Washington8 hr
Aug 30, 10:26 AM CDTFlash Flood WarningMOBMobile6 hr
Aug 30, 10:51 AM CDTSpecial Marine WarningMOB54 min
Aug 30, 10:55 AM CDTTornado WarningMOBMobile, Washington25 min
Aug 30, 11:47 AM CDTFlash Flood WarningMOBClarke, Washington5 hr
Aug 30, 12:03 PM CDTFlash Flood WarningMOBEscambia75 min
Aug 30, 12:23 PM CDTTornado Warning Tornado observedMOBBaldwin, Mobile21 min
Aug 30, 12:30 PM CDTTornado Warning Tornado observedMOBBaldwin, Clarke, Mobile, Washington45 min
Aug 30, 1:08 PM CDTTornado Warning Tornado observedMOBClarke52 min
Aug 30, 1:39 PM CDTTornado Warning Tornado observedMOBClarke, Wilcox39 min
Aug 30, 3:57 PM CDTSpecial Marine WarningMOB48 min
Aug 30, 4:11 PM CDTCoastal Flood WarningMOBBaldwin, Mobile14 hr
Aug 30, 4:18 PM CDTSpecial Marine WarningMOB87 min
Aug 30, 4:20 PM CDTSpecial Marine WarningMOB85 min
Aug 30, 5:05 PM CDTSpecial Weather StatementMOBCovington55 min
Aug 30, 5:19 PM CDTAreal Flood WarningMOBBaldwin, Clarke, Mobile, Washington14 hr
Aug 30, 5:29 PM CDTSpecial Marine WarningMOB91 min
Aug 30, 6:46 PM CDTSpecial Marine WarningMOB89 min

Nearby

Flash Flood Warnings in Alabama, 2021Every flash flood warning in 2021

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.