Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 84, NWS Mobile, AL

October 9, 2017Mobile County, Alabama; George County, Mississippi

NWS Mobile, AL issued this flash flood warning at Oct 9, 2017, 10:18 AM CDT for Mobile County, Alabama; George 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: Oct 9, 2017, 10:18 AM CDT (15:18 UTC)
Expired: Oct 9, 2017, 4:15 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Mobile County, AL, George County, MS

The radar

The Mobile radar (KMOB), 25 km from the middle of the area, began a volume at 15:18 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, 3.3 hours before the alert went out and 146 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: 515 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

905 
WGUS54 KMOB 091518
FFWMOB
ALC097-MSC039-092115-
/O.NEW.KMOB.FF.W.0084.171009T1518Z-171009T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
1018 AM CDT MON OCT 9 2017

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northwestern Mobile County in southwestern Alabama...
  Eastern George County in southeastern Mississippi...

* Until 415 PM CDT

* At 1017 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 2.5 to 3 inches of rain has 
  fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Saraland, Satsuma, Chunchula, Gulfcrest, Semmes, I65 And AL 158 and
  Wilmer.

Additional rainfall amounts of 1 to 2 are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3096 8852 3104 8811 3081 8803 3073 8848
      3074 8851

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 6:37 AM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Oct 9, 7:58 AM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
Oct 9, 9:01 AM CDT	Areal Flood Advisory	MOB	Baldwin, Clarke, Mobile, Washington	3 hr
Oct 9, 9:47 AM CDT	Flash Flood Warning	MOB	Baldwin	6 hr
Oct 9, 5:50 PM CDT	Areal Flood Advisory	MOB	Mobile	115 min
Oct 9, 12:54 PM CDT	Areal Flood Advisory	MOB	Greene	3 hr
Oct 9, 1:34 PM CDT	Flash Flood Warning	MOB	Greene	6 hr
Oct 9, 3:37 PM CDT	Flash Flood Warning	MOB	Perry	6 hr

Nearby

Flash Flood Warnings in Alabama, 2017 Flash Flood Warnings in Mississippi, 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.