Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 83, NWS Mobile, AL

September 17, 2021Stone County, Mississippi

NWS Mobile, AL issued this flash flood warning at Sep 17, 2021, 8:27 AM CDT for Stone County, Mississippi. 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 17, 2021, 8:27 AM CDT (13:27 UTC)
Expired: Sep 17, 2021, 2:22 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Stone County, MS

The radar

The Mobile radar (KMOB), 70 km from the middle of the area, began a volume at 13:29 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, 1.5 hours before the alert went out and 89 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: 1826 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 687 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

106 
WGUS54 KMOB 171327
FFWMOB
MSC131-171930-
/O.NEW.KMOB.FF.W.0083.210917T1327Z-210917T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
827 AM CDT Fri Sep 17 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Eastern Stone County in southeastern Mississippi...

* Until 230 PM CDT Friday.

* At 827 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional heavy rain will continue to move into 
  eastern Stone county over the next 1 to 2 hours. 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...
  Ramsey Springs, Big Level and Whites Crossing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3068 8912 3091 8903 3091 8901 3091 8889
      3077 8888 3075 8888 3074 8888 3073 8888
      3068 8888 3068 8889 3068 8898 3068 8899
      3068 8911

FLASH FLOOD...RADAR INDICATED

$$

21/CLL

2 follow-up statements

185 
WGUS74 KMOB 171651
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1151 AM CDT Fri Sep 17 2021

MSC131-171930-
/O.CON.KMOB.FF.W.0083.000000T0000Z-210917T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Stone MS-
1151 AM CDT Fri Sep 17 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN STONE COUNTY...

At 1151 AM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 2 and 4 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...
  Ramsey Springs.

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.

&&

LAT...LON 3085 8900 3087 8889 3081 8888 3075 8888
      3074 8888 3073 8888 3068 8888 3068 8899
      3068 8906

FLASH FLOOD...RADAR INDICATED

$$

MM

949 
WGUS74 KMOB 171922
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
222 PM CDT Fri Sep 17 2021

MSC131-171932-
/O.CAN.KMOB.FF.W.0083.000000T0000Z-210917T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Stone MS-
222 PM CDT Fri Sep 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN STONE COUNTY...

Any flash flooding associated with earlier convection has likely 
waned, and heavy rainfall has remained outside of the warned area. 
Given this, the flash flood warning is being allowed to expire. 
Additional heavy rainfall is possible later this afternoon and 
evening, and may pose a threat for flash flooding. Please continue 
to heed remaining road closures.

A Flash Flood Watch remains in effect until 700 PM CDT Saturday for 
Portions of Alabama. Portions of northwest Florida. Portions of 
southeast Mississippi.

LAT...LON 3085 8900 3087 8889 3081 8888 3075 8888
      3074 8888 3073 8888 3068 8888 3068 8899
      3068 8906

$$

MM

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 7:17 AM CDT	Areal Flood Advisory	MOB	George, Greene, Perry, Stone	3 hr
Sep 17, 10:11 AM CDT	Flash Flood Warning	MOB	George	5 hr

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.