Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 33, NWS Birmingham, AL

October 9, 2017Chambers County, Alabama

NWS Birmingham, AL issued this flash flood warning at Oct 9, 2017, 6:28 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, 6:28 AM CDT (11:28 UTC)
Expired
Oct 9, 2017, 9:30 AM 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), 60 km from the middle of the area, began a volume at 11:31 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.5 hours before the alert went out and 93 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2017-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2017-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 273 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
41 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
613 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
273 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

950 
WGUS54 KBMX 091128
FFWBMX
ALC017-091430-
/O.NEW.KBMX.FF.W.0033.171009T1128Z-171009T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Birmingham has issued a

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

* Until 930 AM CDT

* At 627 AM CDT, emergency management reported heavy rain across the 
  warned area. Flash flooding is already occurring. Additional heavy 
  rainfall will move over the area and result in more flooding. 

* Some locations that will experience flooding include...
  Valley, Lanett, Lakeview, Cusseta, Huguley, Fairfax, I 85 Welcome
  Center At Lanett, Lanett Municipal Airport and Southern Harbor.

LAT...LON 3274 8523 3275 8528 3273 8529 3273 8540
      3275 8542 3297 8521 3286 8519 3285 8518
      3286 8516 3285 8516 3283 8517 3281 8517
      3280 8515

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 9, 4:35 AM CDTAreal Flood AdvisoryBMXChambers3 hr
Oct 9, 7:53 AM CDTAreal Flood AdvisoryBMXChambers3 hr
Oct 9, 8:08 AM CDTAreal Flood AdvisoryBMXLee3 hr
Oct 9, 9:31 AM CDTFlash Flood WarningBMXChambers3 hr

Nearby

Flash Flood Warnings in Alabama, 2017Every 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.