Alert archive / Mississippi / Flash Flood Warnings in 2020

Flash Flood Warning 36, NWS Mobile, AL

October 28, 20205 counties in Mississippi; 4 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Oct 28, 2020, 8:43 PM CDT for 5 counties in Mississippi; 4 counties in Alabama. It was in force for 5 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: Oct 28, 2020, 8:43 PM CDT (01:43 UTC)
Expired: Oct 29, 2020, 2:06 AM CDT
In force: 5 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 60 km from the middle of the area, began a volume at 01:47 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 00:00Z, 1.7 hours before the alert went out and 119 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1145 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

035 
WGUS54 KMOB 290143
FFWMOB
ALC023-025-097-129-MSC039-041-111-131-153-290745-
/O.NEW.KMOB.FF.W.0036.201029T0143Z-201029T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
843 PM CDT Wed Oct 28 2020

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southwestern Choctaw County in southwestern Alabama...
  Central Clarke County in southwestern Alabama...
  Northwestern Mobile County in southwestern Alabama...
  Washington County in southwestern Alabama...
  George County in southeastern Mississippi...
  Greene County in southeastern Mississippi...
  Perry County in southeastern Mississippi...
  Stone County in southeastern Mississippi...
  Eastern Wayne County in southeastern Mississippi...

* Until 245 AM CDT Thursday.

* At 841 PM CDT, Doppler radar indicated 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 heavy rain.

  SOURCE...Doppler radar.

  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 flash flooding include...
  Jackson, Waynesboro, Wiggins, Citronelle, Lucedale, Chatom, 
  Richton, Leakesville, Chunchula, Wagarville, Saint Stephens, 
  Leroy, Clara, Perkinston, McHenry, Deer Park, Gulfcrest, Tibbie, 
  Beaumont and Calvert.

Additional rainfall amounts of 2 to 4 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.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3091 8914 3112 8915 3189 8848 3172 8790
      3142 8773 3070 8839 3070 8841 3074 8841
      3074 8888 3068 8888 3068 8923 3065 8924
      3065 8934 3091 8934

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

$$

JMM

1 follow-up statement

103 
WGUS74 KMOB 290706
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
206 AM CDT Thu Oct 29 2020

ALC023-025-097-129-MSC039-041-111-131-153-290716-
/O.CAN.KMOB.FF.W.0036.000000T0000Z-201029T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Choctaw AL-Clarke AL-Mobile AL-Washington AL-George MS-Greene MS-
Perry MS-Stone MS-Wayne MS-
206 AM CDT Thu Oct 29 2020

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CHOCTAW, 
CENTRAL CLARKE, NORTHWESTERN MOBILE, WASHINGTON, GEORGE, GREENE, 
PERRY, STONE AND EASTERN WAYNE COUNTIES...

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

LAT...LON 3113 8915 3189 8848 3172 8790 3142 8773
      3070 8839 3070 8841 3074 8841 3074 8888
      3068 8888 3068 8923 3065 8924 3065 8934
      3091 8934 3091 8914

$$

JLH

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 10:09 AM CDT	River Flood Warning	MOB	George, Greene, Perry	23 hr
Oct 28, 7:11 PM CDT	Tornado Warning	MOB	Escambia	16 min
Oct 28, 7:47 PM CDT	Tornado Warning	MOB	Baldwin	16 min
Oct 28, 7:57 PM CDT	Special Marine Warning	MOB		2 hr
Oct 28, 8:14 PM CDT	Special Marine Warning	MOB		2 hr
Oct 28, 9:16 PM CDT	Special Marine Warning	MOB		119 min
Oct 28, 9:26 PM CDT	Flash Flood Warning	MOB	Choctaw, Clarke, Monroe, Wilcox	5 hr
Oct 28, 10:49 PM CDT	Special Marine Warning	MOB		116 min
Oct 29, 4:08 AM CDT	Small Craft Advisory	MOB		28 hr

Nearby

Flash Flood Warnings in Mississippi, 2020 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.