Alert archive / Alabama / Flash Flood Warnings in 2020

Flash Flood Warning 6, NWS Mobile, AL

April 23, 2020Baldwin County, Mobile County, Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 23, 2020, 7:59 AM CDT for Baldwin County, Mobile County, Washington County, Alabama. It was in force for 3 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: Apr 23, 2020, 7:59 AM CDT (12:59 UTC)
Expired: Apr 23, 2020, 11:00 AM CDT
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

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

The radar

The Mobile radar (KMOB), 57 km from the middle of the area, began a volume at 12:58 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, 1.0 hours before the alert went out and 194 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: 2572 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 498 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 424 m²/s²
0-3 km storm-relative helicity: 449 m²/s²
Significant tornado parameter: 7.7
Supercell composite: 25.5

Open this sounding in Storm Lab

The text

As transmitted.

299 
WGUS54 KMOB 231259
FFWMOB
ALC003-097-129-231600-
/O.NEW.KMOB.FF.W.0006.200423T1259Z-200423T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
759 AM CDT Thu Apr 23 2020

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northern Mobile County in southwestern Alabama...
  Northwestern Baldwin County in southwestern Alabama...
  Southeastern Washington County in southwestern Alabama...

* Until 1100 AM CDT.

* At 758 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 2 to 3 inches of rain 
  have already fallen. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Bay Minette, Satsuma, Citronelle, Creola, Chunchula, Stockton,
  Gulfcrest, Axis, Calvert, Mount Vernon, Wilmer, I65 And AL 225 and
  Movico.

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3081 8840 3112 8842 3123 8793 3116 8794
      3116 8797 3114 8794 3116 8793 3115 8790
      3117 8789 3114 8787 3118 8789 3124 8786
      3122 8784 3125 8784 3128 8771 3121 8763
      3084 8763

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

157 
WGUS74 KMOB 231600
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1100 AM CDT Thu Apr 23 2020

ALC003-097-129-231610-
/O.EXP.KMOB.FF.W.0006.000000T0000Z-200423T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mobile AL-Baldwin AL-Washington AL-
1100 AM CDT Thu Apr 23 2020

...THE FLASH FLOOD WARNING FOR NORTHERN MOBILE...NORTHWESTERN BALDWIN
AND SOUTHEASTERN WASHINGTON COUNTIES HAS EXPIRED...

The heavy rain has ended. Flash flooding is no longer expected to
pose a threat, although ponding of water on roadways may still be
present.

LAT...LON 3081 8840 3112 8842 3123 8793 3116 8794
      3116 8797 3114 8794 3116 8793 3115 8790
      3117 8789 3114 8787 3118 8789 3124 8786
      3122 8784 3125 8784 3128 8771 3121 8763
      3084 8763

$$

JLH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 3:37 AM CDT	Special Weather Statement	MOB	Choctaw	53 min
Apr 23, 4:26 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw	49 min
Apr 23, 4:55 AM CDT	Tornado Warning	MOB	Choctaw, Clarke	50 min
Apr 23, 5:12 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington, Wilcox	48 min
Apr 23, 5:19 AM CDT	Tornado Warning	MOB	Choctaw, Washington	12 min
Apr 23, 5:57 AM CDT	Severe Thunderstorm Warning	MOB	Butler, Clarke, Conecuh, Monroe, Wilcox	48 min
Apr 23, 6:03 AM CDT	Severe Thunderstorm Warning	MOB	Mobile, Washington	42 min
Apr 23, 6:11 AM CDT	Tornado Warning	MOB	Mobile	34 min
Apr 23, 6:41 AM CDT	Tornado Warning	MOB	Baldwin, Mobile	49 min
Apr 23, 6:50 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia, Mobile	40 min
Apr 23, 7:10 AM CDT	Tornado Warning	MOB	Baldwin, Escambia	39 min
Apr 23, 7:35 AM CDT	Severe Thunderstorm Warning	MOB	Escambia	55 min
Apr 23, 7:41 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	49 min
Apr 23, 8:12 AM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Crenshaw, Escambia	63 min
Apr 23, 8:30 AM CDT	Flash Flood Warning	MOB	Escambia	4 hr
Apr 23, 8:38 AM CDT	Tornado Warning	MOB	Covington	34 min
Apr 23, 9:48 AM CDT	Coastal Flood Advisory	MOB	Baldwin, Mobile	9 hr
Apr 23, 10:27 AM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Escambia	43 min
Apr 23, 10:28 AM CDT	Flash Flood Warning	MOB	Conecuh, Covington, Escambia	3 hr
Apr 23, 11:27 AM CDT	Special Marine Warning	MOB		93 min
Apr 23, 11:59 AM CDT	Special Marine Warning	MOB		46 min
Apr 23, 12:32 PM CDT	Areal Flood Warning	MOB	Escambia	6 hr
Apr 23, 12:51 PM CDT	Special Marine Warning	MOB		114 min
Apr 23, 1:12 PM CDT	Special Marine Warning	MOB		2 hr
Apr 23, 1:29 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	46 min
Apr 23, 1:32 PM CDT	Special Marine Warning	MOB		88 min
Apr 23, 2:21 PM CDT	Special Marine Warning	MOB		114 min
Apr 23, 3:36 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	39 min
Apr 23, 4:17 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	43 min
Apr 23, 4:26 PM CDT	Severe Thunderstorm Warning	MOB	Washington	22 min
Apr 23, 4:52 PM CDT	Severe Thunderstorm Warning	MOB	Wilcox	38 min

Nearby

Flash Flood Warnings in Alabama, 2020 Every flash flood warning in 2020

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.