Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 21, NWS Birmingham, AL

May 30, 2018Greene County, Hale County, Perry County, Alabama

NWS Birmingham, AL issued this flash flood warning at May 30, 2018, 8:19 PM CDT for Greene County, Hale County, Perry 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: May 30, 2018, 8:19 PM CDT (01:19 UTC)
Expired: May 30, 2018, 11:15 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

Counties Greene County, AL, Hale County, AL, Perry County, AL

The radar

The Birmingham radar (KBMX), 105 km from the middle of the area, began a volume at 01:23 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

Birmingham, AL (KBMX), launched 00:00Z, 1.3 hours before the alert went out and 105 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: 1057 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

250 
WGUS54 KBMX 310119
FFWBMX
ALC063-065-105-310415-
/O.NEW.KBMX.FF.W.0021.180531T0119Z-180531T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Birmingham AL
819 PM CDT WED MAY 30 2018

The National Weather Service in Birmingham has issued a

* Flash Flood Warning for...
  Northern Perry County in central Alabama...
  Southern Greene County in west central Alabama...
  Hale County in west central Alabama...

* Until 1115 PM CDT.

* At 818 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...
  Marion, Greensboro, Forkland, Newbern, Walden Quarters, Thornhill,
  Arcola, Heiberger, Wedgeworth, Tishabee, Greensboro Municipal
  Airport, Duffys Bend, Sawyerville, Evansville, Folsom, Birdine,
  Harper Hill, Laneville, Havana and Judson College.

Additional rainfall amounts of one to two inches are possible in the 
warned area.

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 3297 8746 3293 8742 3288 8742 3287 8735
      3266 8712 3247 8752 3248 8769 3252 8773
      3252 8782 3255 8783 3253 8786 3260 8790
      3261 8784 3262 8786 3263 8793 3259 8806
      3263 8808 3269 8804 3270 8812

$$

25/Owen

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:02 PM CDT	Special Weather Statement	BMX	Greene	28 min
May 30, 7:15 PM CDT	Special Weather Statement	BMX	Blount	30 min
May 30, 7:21 PM CDT	Special Weather Statement	BMX	Greene	24 min
May 30, 7:23 PM CDT	Special Weather Statement	BMX	Walker	37 min
May 30, 7:41 PM CDT	Special Weather Statement	BMX	Etowah, St. Clair	49 min
May 30, 7:48 PM CDT	Areal Flood Advisory	BMX	Greene, Hale, Sumter	3 hr
May 30, 7:53 PM CDT	Special Weather Statement	BMX	Greene, Hale, Sumter	52 min
May 30, 8:11 PM CDT	Areal Flood Advisory	BMX	Greene, Sumter	3 hr
May 30, 8:32 PM CDT	Special Weather Statement	BMX	Calhoun, Cherokee, Etowah, St. Clair	58 min
May 30, 8:36 PM CDT	Special Weather Statement	BMX	Hale, Perry	24 min
May 30, 9:38 PM CDT	Areal Flood Advisory	BMX	Marengo, Perry	3 hr
May 31, 12:51 PM CDT	Special Weather Statement	BMX	Elmore	24 min
May 31, 1:00 PM CDT	Special Weather Statement	BMX	Montgomery	30 min
May 31, 1:32 PM CDT	Special Weather Statement	BMX	Montgomery	28 min
May 31, 2:22 PM CDT	River Flood Warning	BMX	Dallas, Perry	30 hr
May 31, 3:16 PM CDT	Special Weather Statement	BMX	Tallapoosa	14 min

Nearby

Flash Flood Warnings in Alabama, 2018 Every flash flood warning in 2018

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.