Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 69, NWS Mobile, AL

August 30, 2021Clarke County, Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Aug 30, 2021, 11:47 AM CDT for Clarke County, Washington County, 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, 11:47 AM CDT (16:47 UTC)
Expired
Aug 30, 2021, 4:30 PM CDT
In force
5 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Clarke County, AL, Washington County, AL

The radar

The Mobile radar (KMOB), 105 km from the middle of the area, began a volume at 16:49 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

Jackson, MS (KJAN), launched 12:00Z, 4.8 hours before the alert went out and 201 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, Jackson, MS at 12:00Z on 2021-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 49 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, Jackson, MS at 12:00Z on 2021-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 387 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
49 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
463 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
387 m²/s²
0-3 km storm-relative helicity
547 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

974 
WGUS54 KMOB 301647
FFWMOB
ALC025-129-302300-
/O.NEW.KMOB.FF.W.0069.210830T1647Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
1147 AM CDT Mon Aug 30 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Central Clarke County in southwestern Alabama...
  Northern Washington County in southwestern Alabama...

* Until 600 PM CDT Monday.

* At 1147 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...
  Jackson, Chatom, Saint Stephens, Leroy, Millry, Salitpa, Mays 
  Crossroads, Frankville, Bigbee, Prestwick, Carson, Winn, Silver 
  Cross, McVay, Toddtown, Jordan, Koenton, Zimco, Clarksville and 
  Yarbo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3144 8834 3168 8833 3170 8816 3170 8812
      3170 8811 3170 8809 3174 8781 3145 8777

FLASH FLOOD...RADAR INDICATED

$$
2 follow-up statements
135 
WGUS74 KMOB 301827
FFSMOB

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

ALC025-129-302300-
/O.CON.KMOB.FF.W.0069.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clarke AL-Washington AL-
127 PM CDT Mon Aug 30 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM CDT THIS EVENING 
FOR CENTRAL CLARKE AND NORTHERN WASHINGTON COUNTIES...

At 127 PM CDT, Doppler radar indicated thunderstorms had produced 
heavy rains totalling 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...
  Jackson, Chatom, Saint Stephens, Leroy, Millry, Salitpa, Mays 
  Crossroads, Frankville, Bigbee, Prestwick, Carson, Winn, Silver 
  Cross, McVay, Toddtown, Jordan, Koenton, Zimco, Clarksville and 
  Yarbo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3144 8834 3168 8833 3170 8816 3170 8812
      3170 8811 3170 8809 3174 8781 3145 8777

FLASH FLOOD...RADAR INDICATED

$$
024 
WGUS74 KMOB 302130
FFSMOB

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

ALC025-129-302140-
/O.CAN.KMOB.FF.W.0069.000000T0000Z-210830T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clarke AL-Washington AL-
430 PM CDT Mon Aug 30 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL CLARKE AND NORTHERN 
WASHINGTON COUNTIES...AN AREAL FLOOD WARNING REMAINS IN EFFECT...

Flooding has transitioned to longer fuse flooding. 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 8834 3168 8833 3170 8816 3170 8812
      3170 8811 3170 8809 3174 8781 3145 8777

$$

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, 11:57 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Mobile, 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.