Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS Mobile, AL

April 10, 2021Mobile County, Alabama; George County, Mississippi

NWS Mobile, AL issued this flash flood warning at Apr 10, 2021, 5:53 AM CDT for Mobile County, Alabama; George County, Mississippi. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 10, 2021, 5:53 AM CDT (10:53 UTC)
Expired: Apr 10, 2021, 12:00 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Mobile County, AL, George County, MS

The radar

The Mobile radar (KMOB), 11 km from the middle of the area, began a volume at 10:52 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.

What was reported inside it

Time	Report	Where	Remark
Apr 10, 5:56 AM CDT	FLASH FLOOD	1 Nne Downtown Mobile, AL	RIGHT LANE OF THE COCHRANE CAUSEWAY CLOSED DUE TO FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.9 hours before the alert went out and 158 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: 2977 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 18.1

Open this sounding in Storm Lab

The text

As transmitted.

275 
WGUS54 KMOB 101053
FFWMOB
ALC097-MSC039-101700-
/O.NEW.KMOB.FF.W.0011.210410T1053Z-210410T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
553 AM CDT Sat Apr 10 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Mobile County in southwestern Alabama...
  Eastern George County in southeastern Mississippi...

* Until noon CDT Saturday.

* At 553 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 5 inches of rain 
  have fallen. 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...
  Midtown Mobile, Downtown Mobile, Prichard, Tillmans Corner, 
  Saraland, Theodore, Chickasaw, Satsuma, Grand Bay, Bayou La Batre, 
  Creola, Dauphin Island, Chunchula, Axis, Semmes, Tanner Williams, 
  Mobile Regional Airport, I10 And I65, I65 And I165 and I65 And AL 
  158.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3073 8866 3100 8846 3097 8794 3088 8798
      3088 8797 3089 8797 3082 8796 3080 8798
      3080 8797 3073 8801 3069 8800 3075 8797
      3022 8806 3023 8838 3074 8841

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

603 
WGUS74 KMOB 101400
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
900 AM CDT Sat Apr 10 2021

ALC097-MSC039-101700-
/O.CON.KMOB.FF.W.0011.000000T0000Z-210410T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mobile AL-George MS-
900 AM CDT Sat Apr 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL NOON CDT TODAY FOR 
MOBILE AND EASTERN GEORGE COUNTIES...

At 900 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 5 inches of rain have 
fallen. 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...
  Midtown Mobile, Downtown Mobile, Prichard, Tillmans Corner, 
  Saraland, Theodore, Chickasaw, Satsuma, Grand Bay, Bayou La Batre, 
  Creola, Dauphin Island, Chunchula, Axis, Semmes, Tanner Williams, 
  Mobile Regional Airport, I10 And I65, I65 And I165 and I65 And AL 
  158.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3073 8866 3100 8846 3097 8794 3088 8798
      3088 8797 3089 8797 3082 8796 3080 8798
      3080 8797 3073 8801 3069 8800 3075 8797
      3022 8806 3023 8838 3074 8841

FLASH FLOOD...RADAR INDICATED

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 9:31 PM CDT	River Flood Warning	MOB	Mobile	63 hr
Apr 10, 1:06 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw	54 min
Apr 10, 1:15 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Washington	45 min
Apr 10, 1:33 AM CDT	Special Marine Warning	MOB		87 min
Apr 10, 1:58 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington, Wilcox	62 min
Apr 10, 2:22 AM CDT	Special Weather Statement	MOB	Mobile	68 min
Apr 10, 2:35 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	25 min
Apr 10, 2:43 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	17 min
Apr 10, 2:50 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin	55 min
Apr 10, 2:59 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more	61 min
Apr 10, 3:36 AM CDT	Special Marine Warning	MOB		114 min
Apr 10, 3:53 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Butler, Conecuh, Covington, Escambia, Mobile and 2 more	67 min
Apr 10, 4:07 AM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia, Mobile	3 hr
Apr 10, 4:33 AM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Escambia	57 min
Apr 10, 4:53 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Covington, Escambia	52 min
Apr 10, 5:10 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Apr 10, 5:28 AM CDT	Special Marine Warning	MOB		2 hr
Apr 10, 5:40 AM CDT	Flash Flood Warning	MOB	Baldwin	6 hr
Apr 10, 5:44 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Covington, Escambia	61 min
Apr 10, 6:04 AM CDT	Special Marine Warning	MOB		86 min
Apr 10, 6:20 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	40 min
Apr 10, 6:48 AM CDT	Special Marine Warning	MOB		87 min
Apr 10, 6:52 AM CDT	Severe Thunderstorm Warning	MOB	Baldwin	53 min
Apr 10, 7:12 AM CDT	Special Marine Warning	MOB		63 min
Apr 10, 7:30 AM CDT	Special Marine Warning	MOB		90 min
Apr 10, 9:28 AM CDT	River Flood Warning	MOB	Baldwin	11 hr
Apr 10, 9:33 AM CDT	River Flood Warning	MOB	Baldwin	5 hr
Apr 10, 3:11 AM CDT	Severe Thunderstorm Warning	MOB	George, Stone	37 min
Apr 10, 4:31 AM CDT	Areal Flood Advisory	MOB	George, Perry, Stone	3 hr
Apr 10, 5:16 AM CDT	Flash Flood Warning	MOB	George, Perry, Stone	4 hr

Nearby

Flash Flood Warnings in Alabama, 2021 Flash Flood Warnings in Mississippi, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.