Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 74, NWS Mobile, AL

August 31, 2021Escambia County, Santa Rosa County, Florida; 4 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Aug 31, 2021, 3:33 AM CDT for Escambia County, Santa Rosa County, Florida; 4 counties in Alabama. It was in force for 4 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 31, 2021, 3:33 AM CDT (08:33 UTC)
Expired
Aug 31, 2021, 7:10 AM CDT
In force
4 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Conecuh County, AL, Escambia County, AL, Monroe County, AL, Escambia County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 116 km from the middle of the area, began a volume at 08:34 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 00:00Z, 8.6 hours before the alert went out and 219 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 00:00Z on 2021-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 182 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 00:00Z on 2021-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 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
182 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
524 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
284 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

324 
WGUS54 KMOB 310833
FFWMOB
ALC003-035-053-099-FLC033-113-311445-
/O.NEW.KMOB.FF.W.0074.210831T0833Z-210831T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
333 AM CDT Tue Aug 31 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Conecuh County in south central Alabama...
  Escambia County in south central Alabama...
  Central Monroe County in south central Alabama...
  Central Baldwin County in southwestern Alabama...
  Northwestern Escambia County in northwestern Florida...
  Northwestern Santa Rosa County in northwestern Florida...

* Until 945 AM CDT Tuesday.

* At 333 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. Additional rainfall amounts of 1 to 3 inches are possible in 
  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...
  Bay Minette, Atmore, Monroeville, Brewton, Evergreen, Century, 
  Flomaton, Frisco City, McCullough, Peterman, Stapleton, East 
  Brewton, Uriah, Castleberry, Excel, Repton, Pollard, I65 And AL 
  113, I65 And AL 21 and I65 And CR 1.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3067 8789 3172 8742 3157 8687 3155 8686
      3153 8684 3152 8670 3078 8733

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

MM
1 follow-up statement
786 
WGUS74 KMOB 311210
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
710 AM CDT Tue Aug 31 2021

ALC003-035-053-099-FLC033-113-311220-
/O.CAN.KMOB.FF.W.0074.000000T0000Z-210831T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Conecuh AL-Escambia AL-Monroe AL-Escambia FL-Santa
Rosa FL-
710 AM CDT Tue Aug 31 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CONECUH, ESCAMBIA, CENTRAL 
MONROE, CENTRAL BALDWIN, NORTHWESTERN ESCAMBIA AND NORTHWESTERN 
SANTA ROSA COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1200 PM CDT for A 
portion of south central Alabama.

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

LAT...LON 3067 8789 3172 8742 3157 8687 3155 8686
      3153 8684 3152 8670 3078 8733

$$

MM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 31, 6:04 AM CDTHigh Surf AdvisoryMOBEscambia, Okaloosa, Santa Rosa12 hr
Aug 31, 7:09 AM CDTAreal Flood WarningMOBEscambia6 hr
Aug 31, 7:14 AM CDTFlash Flood WarningMOBEscambia, Okaloosa, Santa Rosa6 hr
Aug 31, 7:57 AM CDTSevere Thunderstorm WarningMOBOkaloosa33 min
Aug 30, 10:22 PM CDTFlash Flood WarningMOBMobile, Washington6 hr
Aug 30, 11:27 PM CDTTornado WarningMOBMobile13 min
Aug 31, 1:18 AM CDTFlash Flood WarningMOBBaldwin, Clarke, Mobile, Monroe, Washington6 hr
Aug 31, 3:42 AM CDTSpecial Marine WarningMOB93 min
Aug 31, 4:21 AM CDTSpecial Marine WarningMOB54 min
Aug 31, 4:41 AM CDTSpecial Marine WarningMOB34 min
Aug 31, 4:52 AM CDTSevere Thunderstorm WarningMOBCovington23 min
Aug 31, 5:12 AM CDTSpecial Marine WarningMOB93 min
Aug 31, 5:17 AM CDTSpecial Marine WarningMOB58 min
Aug 31, 5:42 AM CDTSpecial Marine WarningMOB63 min
Aug 31, 5:46 AM CDTSevere Thunderstorm WarningMOBButler, Crenshaw44 min
Aug 31, 6:39 AM CDTSpecial Marine WarningMOB96 min
Aug 31, 6:42 AM CDTSpecial Marine WarningMOB63 min
Aug 31, 6:51 AM CDTSpecial Marine WarningMOB36 min
Aug 31, 7:45 AM CDTSpecial Marine WarningMOB90 min
Aug 31, 8:10 AM CDTSpecial Marine WarningMOB65 min
Aug 31, 8:28 AM CDTSpecial Marine WarningMOB92 min
Aug 31, 9:08 AM CDTSpecial Marine WarningMOB97 min

Nearby

Flash Flood Warnings in Alabama, 2021Flash Flood Warnings in Florida, 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.