Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 19, NWS Birmingham, AL

July 15, 2017Jefferson County, Shelby County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 15, 2017, 5:42 PM CDT for Jefferson County, Shelby County, Alabama. It was in force for 2 hr. 7 reports 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: Jul 15, 2017, 5:42 PM CDT (22:42 UTC)
Expired: Jul 15, 2017, 7:45 PM CDT
In force: 2 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Jefferson County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 30 km from the middle of the area, began a volume at 22:44 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
Jul 15, 5:50 PM CDT	FLASH FLOOD	2 N Pelham, AL	SEVERAL REPORTS FROM LAW ENFORCEMENT AND PUBLIC REGARDING FLOODING OF ROADWAYS AND RESIDENTIAL AREAS IN MANY LOCATIONS WITHIN PELHAM.
Jul 15, 5:55 PM CDT	FLASH FLOOD	1 Ene Bessemer Airport, AL	FLOWING WATER ACROSS SEALES ROAD. THE BESSEMER AIRPORT (ACROSS THE ROAD) MEASURED 1.44 INCHES IN 33 MINUTES (STORM TOTAL STILL MEASURING).
Jul 15, 5:55 PM CDT	FLASH FLOOD	1 Ne Mccalla, AL	SEVERAL REPORTS OF FLASH FLOODING OF ROADWAYS AND RESIDENTIAL AREAS IN BESSEMER.
Jul 15, 6:00 PM CDT	FLASH FLOOD	1 Nw Hoover Met, AL	RESIDENT VIDEO SHOWS FAST-FLOWING WATER THROUGH THEIR YARD. THE RESIDENT CONFIRMED WATER WAS ENTERING THE HOME.
Jul 15, 6:00 PM CDT	FLASH FLOOD	2 N Bent Brook Golf Clu, AL	WIDE SWATHS OF FLOODING IN A RESIDENTIAL AREA.
Jul 15, 6:00 PM CDT	FLASH FLOOD	2 N Bessemer Airport, AL	DEEP, FLOWING WATER ACROSS GREENMOOR DRIVE.
Jul 15, 6:00 PM CDT	FLASH FLOOD	2 Nne Bessemer Airport, AL	WATER FLOWING ALONGSIDE AND ACROSS THE ROADWAY. SOME WATER WAS NEARING NEARBY BUSINESSES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.7 hours before the alert went out and 29 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: 527 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 612 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

843 
WGUS54 KBMX 152242
FFWBMX
ALC073-117-160045-
/O.NEW.KBMX.FF.W.0019.170715T2242Z-170716T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
542 PM CDT SAT JUL 15 2017

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  West central Shelby County in Alabama...
  South central Jefferson County in Alabama...

* Until 745 PM CDT

* At 542 PM CDT, Doppler radar indicated nearly stationary 
  thunderstorms producing heavy rain across the warned area. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Birmingham, Hoover, Bessemer, Pelham, Helena, Hueytown, Fairfield,
  Pleasant Grove, Midfield, Adamsville, Brighton, Lipscomb, Sylvan
  Springs, Mulga, Maytown, Edgewater, Regions Park Or Hoover Met, Oak
  Mountain Amphitheater, Riverchase and McDonald Chapel.

LAT...LON 3335 8678 3331 8674 3327 8676 3329 8685
      3328 8693 3330 8701 3334 8703 3339 8702
      3346 8710 3356 8712 3361 8709 3364 8704
      3353 8694 3340 8689

$$

89^GSatterwhite

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 12:35 PM CDT	Special Weather Statement	BMX	DeKalb	25 min
Jul 15, 1:09 PM CDT	Special Weather Statement	BMX	Cherokee	36 min
Jul 15, 1:20 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	17 min
Jul 15, 4:39 PM CDT	Areal Flood Advisory	BMX	Blount	2 hr
Jul 15, 5:11 PM CDT	Special Weather Statement	BMX	Marion	34 min
Jul 15, 5:18 PM CDT	Special Weather Statement	BMX	Jefferson	27 min
Jul 15, 5:20 PM CDT	Special Weather Statement	BMX	Shelby	25 min
Jul 15, 5:29 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	2 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.