Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 108, NWS Mobile, AL

December 9, 2021Escambia County, Florida; Baldwin County, Alabama

NWS Mobile, AL issued this flash flood warning at Dec 9, 2021, 11:34 PM CST for Escambia County, Florida; Baldwin County, Alabama. 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: Dec 9, 2021, 11:34 PM CST (05:34 UTC)
Expired: Dec 10, 2021, 5:45 AM CST
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Baldwin County, AL, Escambia County, FL

The radar

The Mobile radar (KMOB), 54 km from the middle of the area, began a volume at 05:36 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
Dec 10, 3:00 AM CST	FLASH FLOOD	5 Ne Rosinton, AL	RIVER ROAD WAS WASHED OUT NEAR BRADY ROAD DUE TO A RAPID RISE OF THE NEARBY STYX RIVER. THE NEARBY STYX RIVER GAUGE AT SMITHS LANDING ROSE 10 FEET FROM 11PM TO 9AM.

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, 5.6 hours before the alert went out and 200 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: 1405 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

As transmitted.

107 
WGUS54 KMOB 100534
FFWMOB
ALC003-FLC033-101145-
/O.NEW.KMOB.FF.W.0108.211210T0534Z-211210T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
1134 PM CST Thu Dec 9 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Central Baldwin County in southwestern Alabama...
  West Central Escambia County in northwestern Florida...

* Until 545 AM CST Friday.

* At 1134 PM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. The expected rainfall rate is 2 to 3 inches in 1 
  hour. Additional rainfall amounts of 2 to 4 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...
  Daphne, Spanish Fort, Robertsdale, Loxley, Stapleton, Molino, 
  Gateswood, Rosinton, Tenile, Bay Springs, Barrineau Park, 
  Steelwood, Pine Haven, Malbis, Belforest, Cantonment, Bromley, 
  Molino Crossroads, Cottage Hill and Barth.

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 3075 8793 3079 8731 3056 8731 3055 8791

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 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
Dec 9, 10:34 PM CST	Areal Flood Advisory	MOB	Escambia	3 hr
Dec 9, 11:17 PM CST	Dense Fog Advisory	MOB	Escambia, Okaloosa, Santa Rosa	10 hr
Dec 10, 12:01 AM CST	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr
Dec 10, 1:16 AM CST	Special Weather Statement	MOB	Santa Rosa	44 min
Dec 10, 2:05 AM CST	Areal Flood Advisory	MOB	Okaloosa	3 hr
Dec 10, 1:19 PM CST	Dense Fog Advisory	MOB	Escambia, Okaloosa, Santa Rosa	19 hr
Dec 9, 8:37 PM CST	Areal Flood Advisory	MOB	Mobile	3 hr
Dec 9, 9:38 PM CST	Special Weather Statement	MOB	Mobile	52 min
Dec 10, 6:23 AM CST	River Flood Warning	MOB	Baldwin	25 hr
Dec 10, 11:10 AM CST	Special Weather Statement	MOB	Washington	50 min
Dec 10, 1:19 PM CST	Marine Dense Fog Advisory	MOB		22 hr
Dec 10, 2:21 PM CST	Small Craft Advisory	MOB		42 hr

Nearby

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