Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 89, NWS Mobile, AL

September 19, 2021Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Sep 19, 2021, 4:44 PM CDT for Mobile County, 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 19, 2021, 4:44 PM CDT (21:44 UTC)
Expired: Sep 19, 2021, 10:45 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 27 km from the middle of the area, began a volume at 21:44 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, 9.7 hours before the alert went out and 173 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.

005 
WGUS54 KMOB 192144
FFWMOB
ALC097-200345-
/O.NEW.KMOB.FF.W.0089.210919T2144Z-210920T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northeastern Mobile County in southwestern Alabama...

* Until 1045 PM CDT Sunday.

* At 444 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1.5 to 2.5 inches in 1 
  hour. Additional rainfall amounts of 1 to 2 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...
  Downtown Mobile, Midtown Mobile, Prichard, Saraland, Chickasaw, 
  Satsuma, Creola, Axis, Semmes, I65 And AL 158, I65 And I165, 
  Mackies, Pennsylvania, Celeste, Hatters, Kushla, North Mobile, Oak 
  Grove, Eight Mile and Whistler.

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 3084 8829 3102 8808 3098 8788 3092 8794
      3092 8793 3089 8791 3083 8793 3087 8796
      3086 8797 3082 8794 3078 8802 3075 8803
      3075 8802 3078 8800 3078 8799 3067 8806
      3070 8822

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR

$$

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, 3:31 PM CDT	Flash Flood Warning	MOB	Baldwin	2 hr
Sep 19, 4:10 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	34 min

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.