Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 42, NWS Mobile, AL

December 28, 20184 counties in Alabama

NWS Mobile, AL issued this flash flood warning at Dec 28, 2018, 3:28 AM CST for 4 counties in 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: Dec 28, 2018, 3:28 AM CST (09:28 UTC)
Expired: Dec 28, 2018, 6:30 AM CST
In force: 3 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

Counties Choctaw County, AL, Clarke County, AL, Washington County, AL, Wilcox County, AL

The radar

The Mobile radar (KMOB), 155 km from the middle of the area, began a volume at 09:30 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
Dec 28, 4:15 AM CST	FLASH FLOOD	Yantley, AL	SHIN TO ANKLE DEEP WATER ALONG HIGHWAY 10 IN THE YANTLEY COMMUNITY. REPORT OF 4 FEET OF WATER IN A HOUSE NEAR HIGHWAY 32 IN YANTLEY. WATER RESCUES REPORTED.
Dec 28, 4:30 AM CST	FLOOD	1 E Riderwood, AL	RIDERWOOD DRIVE ON BOTH SIDES OF SCOTT MOUNTAIN ROAD WAS FLOODED OUT ACROSS THE ROADWAY.
Dec 28, 4:30 AM CST	FLASH FLOOD	1 Se Yantley, AL	COUNTY ROAD 32 IN YANTLEY AT THE RAILROAD TRACKS WAS REPORTED UNDER WATER.
Dec 28, 5:00 AM CST	FLASH FLOOD	Jachin, AL	A PART OF COUNTY ROAD 32 NEAR JACHIN HAS BEEN WASHED OUT.

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

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 9.5 hours before the alert went out and 218 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: 11 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 472 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

500 
WGUS54 KMOB 280928
FFWMOB
ALC023-025-129-131-281230-
/O.NEW.KMOB.FF.W.0042.181228T0928Z-181228T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
328 AM CST FRI DEC 28 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Choctaw County in southwestern Alabama...
  Northern Washington County in southwestern Alabama...
  Clarke County in southwestern Alabama...
  Western Wilcox County in south central Alabama...

* Until 630 AM CST.

* At 327 AM CST, Doppler radar indicated heavy rain across the 
  warned area. Up to five inches of rain have already fallen in 
  some locations. Flash flooding is already occurring.

* Some locations that will experience flooding include...
  Jackson, Thomasville, Butler, Grove Hill, Chatom, Saint Stephens,
  Wagarville, Leroy, Whatley, Tibbie, Pine Hill, Lisman, Millry,
  Silas, Fruitdale, Coffeeville, Pennington, Fulton, Gilbertown and
  Yellow Bluff.

Additional rainfall amounts of 2 to 4 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 3231 8793 3228 8802 3209 8805 3206 8812
      3199 8810 3200 8763 3213 8762 3213 8752
      3227 8751 3227 8744 3220 8736 3220 8733
      3183 8745 3181 8752 3170 8752 3170 8757
      3160 8757 3126 8844 3191 8847 3231 8842

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 27, 6:32 PM CST	Flash Flood Warning	MOB	Choctaw, Clarke, Monroe, Washington, Wilcox	6 hr
Dec 27, 6:57 PM CST	River Flood Warning	MOB	Covington, Escambia	16 hr
Dec 27, 6:59 PM CST	Special Weather Statement	MOB	Clarke	46 min
Dec 27, 7:00 PM CST	River Flood Warning	MOB	Baldwin	16 hr
Dec 27, 7:05 PM CST	Areal Flood Advisory	MOB	Butler, Clarke, Conecuh, Covington, Crenshaw, Monroe and 1 more	3 hr
Dec 27, 8:24 PM CST	River Flood Warning	MOB	Dallas, Monroe, Wilcox	13 days
Dec 27, 8:24 PM CST	River Flood Warning	MOB	Clarke, Monroe, Wilcox	15 days
Dec 27, 8:39 PM CST	Flash Flood Warning	MOB	Choctaw	6 hr
Dec 27, 10:02 PM CST	Areal Flood Advisory	MOB	Butler, Conecuh, Covington, Crenshaw, Monroe, Wilcox	3 hr
Dec 28, 12:29 AM CST	Flash Flood Warning	MOB	Choctaw, Clarke, Washington	3 hr
Dec 28, 2:13 AM CST	Marine Dense Fog Advisory	MOB		16 hr
Dec 28, 2:28 AM CST	Special Weather Statement	MOB	Choctaw	47 min
Dec 28, 2:30 AM CST	Severe Thunderstorm Warning	MOB	Choctaw	45 min
Dec 28, 2:47 AM CST	Tornado Warning	MOB	Washington	28 min
Dec 28, 3:08 AM CST	Special Weather Statement	MOB	Clarke	37 min
Dec 28, 3:13 AM CST	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	19 min
Dec 28, 4:12 AM CST	Flash Flood Warning Emergency	MOB	Choctaw	3 hr
Dec 28, 4:45 AM CST	Severe Thunderstorm Warning	MOB	Mobile, Washington	45 min
Dec 28, 4:52 AM CST	Areal Flood Advisory	MOB	Mobile, Washington	3 hr
Dec 28, 5:20 AM CST	Special Weather Statement	MOB	Mobile	40 min
Dec 28, 5:51 AM CST	Special Marine Warning	MOB		84 min
Dec 28, 5:54 AM CST	Special Weather Statement	MOB	Baldwin, Mobile	66 min
Dec 28, 6:04 AM CST	Special Weather Statement	MOB	Monroe	41 min
Dec 28, 6:25 AM CST	Areal Flood Warning	MOB	Choctaw, Washington	6 hr
Dec 28, 6:28 AM CST	Flash Flood Warning	MOB	Clarke, Wilcox	3 hr
Dec 28, 8:23 AM CST	Special Weather Statement	MOB	Covington	52 min
Dec 28, 8:38 AM CST	Special Marine Warning	MOB		97 min
Dec 28, 8:42 AM CST	Special Marine Warning	MOB		68 min
Dec 28, 9:03 AM CST	Areal Flood Warning	MOB	Choctaw, Clarke, Washington, Wilcox	27 hr
Dec 28, 1:15 PM CST	Areal Flood Advisory	MOB	Baldwin	3 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.