Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 10, NWS Birmingham, AL

May 20, 2017Elmore County, Montgomery County, Alabama

NWS Birmingham, AL issued this flash flood warning at May 20, 2017, 9:00 PM CDT for Elmore County, Montgomery County, Alabama. It was in force for 3 hr. 4 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, 9:00 PM CDT (02:00 UTC)
Expired: May 21, 2017, 12:00 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Elmore County, AL, Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 29 km from the middle of the area, began a volume at 01:59 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, 9:30 PM CDT	FLASH FLOOD	2 Ne Alabama State Univ, AL	ROADS ARE FLOODED AROUND FOREST PARK DRIVE. SEVERAL CARS WERE FLOODED.
May 20, 10:00 PM CDT	FLASH FLOOD	1 Nnw Emerald Mountain, AL	A FEW ROADS WERE FLOODED AND IMPASSABLE. THESE INCLUDE DOGWOOD MEADOWS DRIVE AT MT MEADOWS LANE WHERE VEHICLE STRANDED IN HIGH WATER, AND RIFLE RANGE ROAD AND LAPRADE DRIVE.
May 20, 10:00 PM CDT	FLASH FLOOD	1 Ssw Wetumpka, AL	HIGHWAY 231 NEAR THE WINN DIXIE WAS FLOODED AND IMPASSABLE.
May 20, 10:06 PM CDT	FLASH FLOOD	2 Sse Montgomery Countr, AL	SEVERAL VEHICLES UNDER WATER AROUND THE CAMBRIDGE PARK APARTMENTS NEAR HIGHWAY 80 AND WOODLEY ROAD.

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, 2.0 hours before the alert went out and 171 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.

934 
WGUS54 KBMX 210200
FFWBMX
ALC051-101-210500-
/O.NEW.KBMX.FF.W.0010.170521T0200Z-170521T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Elmore County in east central Alabama...
  Northeastern Montgomery County in south central Alabama...

* Until midnight CDT

* At 859 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Montgomery, Wetumpka, Tallassee, Deatsville, Eclectic, Santuck,
  Auburn University In Montgomery, Titus, Emerald Mountain, Ten Cedar
  Estates, Waugh, Dexter, Lagoon Park, Martin Lake At Kowaliga, Weoka
  Mills, Jordan Lake, Eastdale Mall, Mount Meigs, Blue Ridge and
  Pinedale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3258 8625 3256 8641 3275 8641 3275 8634
      3277 8634 3275 8632 3275 8597 3277 8597
      3275 8595 3275 8588 3268 8591 3265 8589
      3250 8589 3248 8585 3245 8589 3245 8599
      3243 8599 3242 8602 3238 8601 3224 8630

$$

32/Davis

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, 7:51 PM CDT	Flash Flood Warning	BMX	Autauga, Dallas, Elmore, Lowndes, Montgomery	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, 9:21 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.