Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 88, NWS Mobile, AL

September 19, 2021Baldwin County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 19, 2021, 3:31 PM CDT for Baldwin County, Alabama. It was in force for 2 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 19, 2021, 3:31 PM CDT (20:31 UTC)
Expired: Sep 19, 2021, 5:57 PM CDT
In force: 2 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 67 km from the middle of the area, began a volume at 20:34 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 213 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1119 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

051 
WGUS54 KMOB 192031
FFWMOB
ALC003-200230-
/O.NEW.KMOB.FF.W.0088.210919T2031Z-210920T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
331 PM CDT Sun Sep 19 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  East Central Baldwin County in southwestern Alabama...

* Until 930 PM CDT.

* At 331 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. The expected rainfall rate is 1 to 3 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...
  mainly rural areas of East Central Baldwin County

This includes the following streams and drainages...
  Bellefontaine Creek, Hollinger Creek, Flat Creek, Cowpen Creek, 
  Perdido River, Eightmile Creek and Styx River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3072 8750 3069 8746 3059 8758 3065 8767
      3075 8754 3074 8753

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR

$$

MM

1 follow-up statement

793 
WGUS74 KMOB 192257
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
557 PM CDT Sun Sep 19 2021

ALC003-192307-
/O.CAN.KMOB.FF.W.0088.000000T0000Z-210920T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-
557 PM CDT Sun Sep 19 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL BALDWIN 
COUNTY...

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

LAT...LON 3072 8750 3069 8746 3059 8758 3065 8767
      3075 8754 3074 8753

$$

MM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 10:53 AM CDT	Special Marine Warning	MOB		52 min
Sep 19, 11:12 AM CDT	Special Marine Warning	MOB		48 min
Sep 19, 2:21 PM CDT	Areal Flood Advisory	MOB	Mobile	4 hr
Sep 19, 2:24 PM CDT	Areal Flood Advisory	MOB	Baldwin	4 hr
Sep 19, 3:11 PM CDT	Areal Flood Advisory	MOB	Baldwin	2 hr
Sep 19, 4:10 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	34 min
Sep 19, 4:44 PM CDT	Flash Flood Warning	MOB	Mobile	6 hr

Nearby

Flash Flood Warnings in Alabama, 2021 Every 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.