Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 34, NWS Birmingham, AL

October 9, 2017Chambers County, Alabama

NWS Birmingham, AL issued this flash flood warning at Oct 9, 2017, 9:31 AM CDT for Chambers 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: Oct 9, 2017, 9:31 AM CDT (14:31 UTC)
Expired: Oct 9, 2017, 12:30 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Chambers County, AL

The radar

The Maxwell AFB radar (KMXX), 56 km from the middle of the area, began a volume at 14:35 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

Birmingham, AL (KBMX), launched 12:00Z, 2.5 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: 496 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

966 
WGUS54 KBMX 091431
FFWBMX
ALC017-091730-
/O.NEW.KBMX.FF.W.0034.171009T1431Z-171009T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Southern Chambers County in east central Alabama...

* Until 1230 PM CDT

* At 929 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Rainfall estimates of over 5 
  inches of rain in the past six hours are being shown in eastern 
  Chambers County. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Valley, Lanett, Lafayette, La Fayette, Lakeview, Cusseta, Chambers
  County Lake, Fredonia, Veasey Creek Park, Denson, Huguley, Fairfax,
  River View, Amity Park, Oak Bowery, Buffalo, Sturkie, Southern
  Harbor, Lanett Municipal Airport and I 85 Welcome Center At Lanett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3276 8514 3275 8514 3275 8528 3273 8529
      3273 8540 3274 8541 3274 8543 3273 8543
      3273 8545 3292 8550 3300 8545 3300 8521
      3286 8519 3285 8516 3283 8517 3281 8517
      3278 8512

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 4:35 AM CDT	Areal Flood Advisory	BMX	Chambers	3 hr
Oct 9, 6:28 AM CDT	Flash Flood Warning	BMX	Chambers	3 hr
Oct 9, 7:53 AM CDT	Areal Flood Advisory	BMX	Chambers	3 hr
Oct 9, 8:08 AM CDT	Areal Flood Advisory	BMX	Lee	3 hr

Nearby

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.