Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 7, NWS Mobile, AL

April 14, 2018Washington County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 14, 2018, 4:53 PM CDT for Washington County, Alabama. It was in force for 6 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: Apr 14, 2018, 4:53 PM CDT (21:53 UTC)
Expired: Apr 14, 2018, 11:00 PM CDT
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Washington County, AL

The radar

The Mobile radar (KMOB), 58 km from the middle of the area, began a volume at 21:51 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.9 hours before the alert went out and 168 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: 1802 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 293 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

As transmitted.

212 
WGUS54 KMOB 142153
FFWMOB
ALC129-150400-
/O.NEW.KMOB.FF.W.0007.180414T2153Z-180415T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
453 PM CDT SAT APR 14 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southwestern Washington County in southwestern Alabama...

* Until 1100 PM CDT Saturday.

* At 453 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Two to three inches of rain 
  have already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Deer Park.

LAT...LON 3134 8821 3119 8826 3114 8830 3114 8833
      3111 8833 3111 8843 3113 8843 3125 8844

$$

1 follow-up statement

728 
WGUS74 KMOB 142348
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
648 PM CDT SAT APR 14 2018

ALC129-150400-
/O.CON.KMOB.FF.W.0007.000000T0000Z-180415T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington AL-
648 PM CDT SAT APR 14 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
SOUTHWESTERN WASHINGTON COUNTY...

At 647 PM CDT, Doppler radar indicates that showers and 
thunderstorms with heavy rain continue to move across the warned 
area.  Radar rainfall estimates show that 2.5 to near 7 inches of 
rain has fallen over the area. Flash flooding remains likely as 
additional thunderstorms move across the area through the late 
evening hours.

Some locations that will experience flooding include...
Deer Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3134 8821 3119 8826 3114 8830 3114 8833
      3111 8833 3111 8843 3113 8843 3125 8844

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 3:19 AM CDT	Wind Advisory	MOB	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	18 hr
Apr 14, 4:09 AM CDT	Gale Warning	MOB		18 hr
Apr 14, 4:09 AM CDT	Small Craft Advisory	MOB		63 hr
Apr 14, 11:59 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	61 min
Apr 14, 1:07 PM CDT	Special Weather Statement	MOB	Choctaw	53 min
Apr 14, 2:00 PM CDT	Areal Flood Advisory	MOB	Choctaw, Clarke, Washington	3 hr
Apr 14, 2:35 PM CDT	Flash Flood Warning	MOB	Choctaw, Washington	6 hr
Apr 14, 3:46 PM CDT	Flash Flood Warning	MOB	Clarke, Washington	6 hr
Apr 14, 5:34 PM CDT	Areal Flood Advisory	MOB	Clarke, Washington, Wilcox	3 hr
Apr 14, 6:14 PM CDT	Flash Flood Warning	MOB	Clarke, Washington, Wilcox	6 hr
Apr 14, 6:57 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	20 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.