Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 21, NWS Mobile, AL

September 4, 2018Baldwin County, Escambia County, Alabama; Escambia County, Santa Rosa County, Florida

NWS Mobile, AL issued this flash flood warning at Sep 4, 2018, 10:45 PM CDT for Baldwin County, Escambia County, Alabama; Escambia County, Santa Rosa County, Florida. It was in force for 12 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: Sep 4, 2018, 10:45 PM CDT (03:45 UTC)
Expired: Sep 5, 2018, 10:45 AM CDT
In force: 12 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Baldwin County, AL, Escambia County, AL, Escambia County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 66 km from the middle of the area, began a volume at 03:44 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
Sep 5, 6:25 AM CDT	FLASH FLOOD	Malbis, AL	CARS STALLED IN HIGH WATER OVER THE ROAD IN THE MALBIS AREA. REPORT VIA SOCIAL MEDIA.

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, 3.8 hours before the alert went out and 209 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: 32 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1016 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -73 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

791 
WGUS54 KMOB 050345
FFWMOB
ALC003-053-FLC033-113-050945-
/O.NEW.KMOB.FF.W.0021.180905T0345Z-180905T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
1045 PM CDT TUE SEP 4 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northern Baldwin County in southwestern Alabama...
  Escambia County in south central Alabama...
  Northern Santa Rosa County in northwestern Florida...
  Northwestern Escambia County in northwestern Florida...

* Until 445 AM CDT Wednesday.

* At 1044 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

Additional rainfall amounts of three to six 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 3093 8796 3094 8788 3099 8787 3103 8791
      3103 8796 3110 8797 3116 8793 3114 8787
      3121 8788 3121 8785 3123 8786 3123 8783
      3130 8779 3130 8771 3125 8766 3123 8756
      3126 8748 3126 8708 3078 8685 3061 8794

$$

1 follow-up statement

882 
WGUS54 KMOB 050933
FFWMOB
ALC003-053-FLC033-113-051545-
/O.EXT.KMOB.FF.W.0021.000000T0000Z-180905T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
433 AM CDT WED SEP 5 2018

The National Weather Service in Mobile has extended the

* Flash Flood Warning for...
  Northern Baldwin County in southwestern Alabama...
  Escambia County in south central Alabama...
  Northern Santa Rosa County in northwestern Florida...
  Northwestern Escambia County in northwestern Florida...

* Until 1045 AM CDT Wednesday.

* At 431 AM CDT, Doppler radar indicated heavy rain across the 
  warned area. Five to eight inches of rain has fallen. Flash 
  flooding is already occurring.

Additional rainfall amounts of two to four 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 3093 8796 3094 8788 3099 8787 3103 8791
      3103 8796 3110 8797 3116 8793 3114 8787
      3121 8788 3121 8785 3123 8786 3123 8783
      3130 8779 3130 8771 3125 8766 3123 8756
      3126 8748 3126 8708 3078 8685 3061 8794

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 8:24 PM CDT	Flash Flood Warning	MOB	Baldwin	12 hr
Sep 4, 8:24 PM CDT	River Flood Warning	MOB	Baldwin	40 hr
Sep 4, 8:31 PM CDT	River Flood Warning	MOB	Baldwin	4 days
Sep 4, 8:32 PM CDT	River Flood Warning	MOB	Baldwin	70 hr
Sep 4, 9:00 PM CDT	Flash Flood Warning	MOB	Mobile	6 hr
Sep 5, 12:53 AM CDT	Tornado Warning	MOB	Baldwin	25 min
Sep 5, 2:06 AM CDT	Flash Flood Warning	MOB	Clarke, Monroe, Washington	6 hr
Sep 5, 3:19 AM CDT	Special Marine Warning	MOB		26 min
Sep 5, 3:32 AM CDT	Special Marine Warning	MOB		28 min
Sep 5, 4:30 AM CDT	Flash Flood Warning	MOB	Choctaw, Clarke	6 hr
Sep 5, 4:57 AM CDT	Small Craft Advisory	MOB		5 hr
Sep 5, 5:15 AM CDT	Coastal Flood Advisory	MOB	Baldwin, Mobile	9 hr
Sep 5, 5:15 AM CDT	High Surf Advisory	MOB	Baldwin, Mobile	9 hr
Sep 5, 7:54 AM CDT	Flash Flood Warning	MOB	Baldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more	6 hr
Sep 5, 8:06 AM CDT	Flash Flood Warning	MOB	Baldwin, Clarke, Monroe, Washington	6 hr
Sep 5, 9:06 AM CDT	Flash Flood Warning	MOB	Clarke, Conecuh, Monroe, Wilcox	6 hr
Sep 5, 9:35 AM CDT	Special Marine Warning	MOB		115 min
Sep 5, 10:25 AM CDT	Flash Flood Warning	MOB	Choctaw, Clarke	5 hr
Sep 5, 12:53 PM CDT	Areal Flood Advisory	MOB	Mobile	52 min
Sep 5, 1:50 PM CDT	Areal Flood Warning	MOB	Baldwin, Escambia	6 hr
Sep 4, 9:29 PM CDT	Tornado Warning	MOB	Escambia, Santa Rosa	31 min
Sep 4, 9:55 PM CDT	Tornado Warning Tornado observed	MOB	Santa Rosa	27 min
Sep 5, 3:10 AM CDT	Tornado Warning	MOB	Okaloosa, Santa Rosa	29 min
Sep 5, 3:31 AM CDT	Tornado Warning	MOB	Okaloosa	19 min
Sep 5, 9:57 AM CDT	Flash Flood Warning	MOB	Okaloosa, Santa Rosa	6 hr

Nearby

Flash Flood Warnings in Alabama, 2018 Flash Flood Warnings in Florida, 2018 Every flash flood warning in 2018

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.