Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 9, NWS Birmingham, AL

May 20, 20175 counties in Alabama

NWS Birmingham, AL issued this flash flood warning at May 20, 2017, 7:51 PM CDT for 5 counties in Alabama. It was in force for 3 hr. 6 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: May 20, 2017, 7:51 PM CDT (00:51 UTC)
Expired: May 20, 2017, 10:45 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Autauga County, AL, Dallas County, AL, Elmore County, AL, Lowndes County, AL, Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 92 km from the middle of the area, began a volume at 00:53 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
May 20, 8:22 PM CDT	FLASH FLOOD	1 Nw Calhoun, AL	COUNTY ROAD 33 UNDERWATER NEAR CALHOUN.
May 20, 9:23 PM CDT	FLASH FLOOD	2 Wnw Boylston, AL	CAR SUBMERGED IN WATER NEAR COLISEUM BLVD.
May 20, 9:45 PM CDT	FLASH FLOOD	2 Sw Capitol Hill Golf, AL	FLOODING REPORTED NEAR THE COOTERS POND AREA.
May 20, 9:53 PM CDT	FLASH FLOOD	1 Ssw Montgomery, AL	THE INTERSECTIONS ALONG PERRY STREET WERE FLOODED UP TO THE FLOORBOARDS ON VEHICLES.
May 20, 10:00 PM CDT	FLASH FLOOD	2 Ne Hayneville, AL	SEVERAL ROADS WERE TEMPORARILY IMPASSABLE DUE TO HIGH WATER. SEVERAL GRAVEL ROADS WERE WASHED OUT. ONE BRIDGE PIPE WAS WASH OUT. SOME AREAS RECEIVED OVER 8 INCHES OF RAIN.
May 20, 10:00 PM CDT	FLASH FLOOD	2 Wsw Wetumpka Muni Air, AL	A FEW ROADS WERE FLOODED AND IMPASSABLE IN MILLBROOK. THESE INCLUDE COUNTRY PLACE DRIVE, TURTLE PLACE DRIVE AND HIGHWAY 14, AND DOGWOOD CIRCLE AND PINELEAF DRIVE.

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.9 hours before the alert went out and 243 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: 86 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1583 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

648 
WGUS54 KBMX 210051
FFWBMX
ALC001-047-051-085-101-210345-
/O.NEW.KBMX.FF.W.0009.170521T0051Z-170521T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
751 PM CDT SAT MAY 20 2017

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Central Autauga County in Alabama...
  Southwestern Elmore County in east central Alabama...
  Lowndes County in south central Alabama...
  Southeastern Dallas County in south central Alabama...
  Western Montgomery County in south central Alabama...

* Until 1045 PM CDT

* At 750 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have 
  already fallen in spots, and another 1 to 2 inches of rain may 
  fall in the next few hours. Flash flooding is expected to begin 
  shortly.

* Some locations that will experience flooding include...
  Montgomery, Prattville, Millbrook, Fort Deposit, Mosses,
  Hayneville, Elmore, Coosada, Deatsville, Autaugaville, White Hall,
  Gordonville, Lowndesboro, Benton, Hyundai Motors Of Alabama, Tyler,
  Autauga County Airport, Woodcrest, Snowdoun and Hunter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Keep children away from storm drains, culverts, creeks and streams.
Water levels can rise rapidly and sweep children away.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3205 8686 3205 8710 3253 8692 3258 8624
      3205 8632 3205 8641 3204 8640 3196 8641
      3196 8686

$$

75

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 7:11 PM CDT	Special Weather Statement	BMX	Elmore	34 min
May 20, 7:18 PM CDT	Flash Flood Warning	BMX	Cherokee	3 hr
May 20, 7:31 PM CDT	Special Weather Statement	BMX	Coosa, Tallapoosa	29 min
May 20, 7:45 PM CDT	Flash Flood Warning	BMX	Chilton, Jefferson, Shelby, Talladega	3 hr
May 20, 8:24 PM CDT	Areal Flood Advisory	BMX	Calhoun, Etowah, St. Clair, Talladega	3 hr
May 20, 8:26 PM CDT	Special Weather Statement	BMX	Cleburne	64 min
May 20, 8:29 PM CDT	River Flood Warning	BMX	Jefferson	14 hr
May 20, 9:00 PM CDT	Flash Flood Warning	BMX	Elmore, Montgomery	3 hr
May 20, 9:21 PM CDT	Special Weather Statement	BMX	Lowndes	24 min
May 20, 9:45 PM CDT	Special Weather Statement	BMX	Pike	60 min
May 20, 10:17 PM CDT	Special Weather Statement	BMX	Bullock	58 min
May 20, 10:23 PM CDT	Flash Flood Warning	BMX	Cherokee	3 hr
May 20, 10:35 PM CDT	Flash Flood Warning	BMX	Autauga, Dallas, Elmore, Lowndes, Montgomery	6 hr
May 20, 11:04 PM CDT	Special Weather Statement	BMX	Macon	41 min
May 20, 11:13 PM CDT	Special Weather Statement	BMX	Lee	32 min
May 20, 11:40 PM CDT	Areal Flood Advisory	BMX	Macon, Tallapoosa	3 hr
May 20, 11:44 PM CDT	Special Weather Statement	BMX	Lee, Russell	61 min
May 21, 12:01 AM CDT	Flash Flood Warning	BMX	Macon	3 hr
May 21, 12:03 AM CDT	Special Weather Statement	BMX	Barbour	42 min
May 21, 12:30 AM CDT	Areal Flood Advisory	BMX	Lee	3 hr
May 21, 12:33 AM CDT	Special Weather Statement	BMX	Chambers, Lee	57 min
May 21, 1:14 AM CDT	Special Weather Statement	BMX	Chambers	46 min
May 21, 1:40 AM CDT	Areal Flood Advisory	BMX	Randolph	3 hr
May 21, 4:25 AM CDT	Areal Flood Warning	BMX	Lowndes, Montgomery	3 hr
May 21, 6:55 AM CDT	River Flood Warning	BMX	Montgomery	48 hr
May 21, 4:05 PM CDT	Flash Flood Watch	BMX	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 17 more	47 hr
May 21, 6:17 PM CDT	Special Weather Statement	BMX	Lamar, Marion	43 min

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.