Alert archive / Florida / Flash Flood Warnings in 2017

Flash Flood Warning 63, NWS Mobile, AL

August 4, 2017Escambia County, Florida; Baldwin County, Alabama

NWS Mobile, AL issued this flash flood warning at Aug 4, 2017, 8:38 AM CDT for Escambia County, Florida; Baldwin County, Alabama. It was in force for 3 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: Aug 4, 2017, 8:38 AM CDT (13:38 UTC)
Expired: Aug 4, 2017, 11:45 AM CDT
In force: 3 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), 80 km from the middle of the area, began a volume at 13:41 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, 1.6 hours before the alert went out and 219 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: 1794 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 124 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.

277 
WGUS54 KMOB 041338
FFWMOB
ALC003-FLC033-041645-
/O.NEW.KMOB.FF.W.0063.170804T1338Z-170804T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
838 AM CDT FRI AUG 4 2017

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southeastern Baldwin County in southwestern Alabama...
  South central Escambia County in northwestern Florida...

* Until 1145 AM CDT

* At 837 AM 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.

* Some locations that will experience flooding include...
  Lillian, Myrtle Grove and Elberta. 

Additional rainfall amounts of up to 2 inches are possible in the 
warned area.

LAT...LON 3058 8729 3040 8728 3036 8759 3054 8771

$$

1 follow-up statement

065 
WGUS74 KMOB 041637
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1137 AM CDT FRI AUG 4 2017

ALC003-FLC033-041645-
/O.EXP.KMOB.FF.W.0063.000000T0000Z-170804T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Baldwin AL-Escambia FL-
1137 AM CDT FRI AUG 4 2017

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN BALDWIN AND SOUTH CENTRAL
ESCAMBIA COUNTIES WILL EXPIRE AT 1145 AM CDT...

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

LAT...LON 3058 8729 3040 8728 3036 8759 3054 8771

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 5:20 AM CDT	Special Weather Statement	MOB	Escambia, Okaloosa, Santa Rosa	40 min
Aug 4, 6:13 AM CDT	Special Weather Statement	MOB	Escambia, Okaloosa, Santa Rosa	92 min
Aug 4, 7:55 AM CDT	Special Weather Statement	MOB	Okaloosa	65 min
Aug 4, 8:22 AM CDT	Areal Flood Advisory	MOB	Escambia, Okaloosa, Santa Rosa	3 hr
Aug 4, 11:23 AM CDT	Areal Flood Advisory	MOB	Escambia, Okaloosa, Santa Rosa	3 hr
Aug 4, 6:03 AM CDT	Special Marine Warning	MOB		57 min
Aug 4, 6:22 AM CDT	Special Marine Warning	MOB		23 min
Aug 4, 7:20 AM CDT	Special Marine Warning	MOB		55 min
Aug 4, 7:39 AM CDT	Special Marine Warning	MOB		96 min
Aug 4, 8:02 AM CDT	Special Weather Statement	MOB	Baldwin	58 min
Aug 4, 9:14 AM CDT	Special Marine Warning	MOB		2 hr
Aug 4, 12:22 PM CDT	Special Marine Warning	MOB		83 min
Aug 4, 1:17 PM CDT	Special Marine Warning	MOB		88 min
Aug 4, 5:09 PM CDT	Areal Flood Advisory	MOB	Baldwin	2 hr
Aug 4, 5:15 PM CDT	Areal Flood Advisory	MOB	Mobile	2 hr
Aug 4, 5:29 PM CDT	Areal Flood Advisory	MOB	Mobile	2 hr
Aug 4, 5:37 PM CDT	Special Weather Statement	MOB	Mobile	23 min
Aug 4, 5:42 PM CDT	Flash Flood Warning	MOB	Mobile	2 hr
Aug 4, 6:09 PM CDT	Special Weather Statement	MOB	Escambia	51 min

Nearby

Flash Flood Warnings in Florida, 2017 Flash Flood Warnings in Alabama, 2017 Every flash flood warning in 2017

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.