Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 20, NWS Birmingham, AL

July 15, 2017Montgomery County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 15, 2017, 9:32 PM CDT for Montgomery County, Alabama. It was in force for 3 hr. 1 report 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, 9:32 PM CDT (02:32 UTC)
Expired: Jul 16, 2017, 12:30 AM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 46 km from the middle of the area, began a volume at 02:31 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.

What was reported inside it

Time	Report	Where	Remark
Jul 15, 9:33 PM CDT	FLASH FLOOD	2 Ssw Gunter Afb, AL	6 OF WATER ACROSS THE INTERSECTION.

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, 2.5 hours before the alert went out and 196 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: 92 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1558 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

507 
WGUS54 KBMX 160232
FFWBMX
ALC101-160530-
/O.NEW.KBMX.FF.W.0020.170716T0232Z-170716T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  North central Montgomery County in south central Alabama...

* Until 1230 AM CDT

* At 931 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Montgomery, Eastdale Mall, Alabama State University, Montgomery
  Riverwalk Stadium, Lagoon Park, Gunter Air Force Base and Alabama
  State Capitol.

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 3242 8618 3240 8617 3236 8620 3233 8625
      3233 8632 3237 8633 3241 8632 3242 8626

$$

89^GSatterwhite

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 8:16 PM CDT	Special Weather Statement	BMX	Perry	29 min
Jul 15, 8:35 PM CDT	Special Weather Statement	BMX	Montgomery	25 min
Jul 15, 9:49 PM CDT	Areal Flood Advisory	BMX	Lowndes	3 hr
Jul 16, 7:32 AM CDT	Areal Flood Warning	BMX	Jefferson	3 hr
Jul 16, 8:48 AM CDT	Areal Flood Warning	BMX	Shelby	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.