Alert archive / Alabama / Flash Flood Warnings in 2018

Flash Flood Warning 37, NWS Mobile, AL

December 27, 2018Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at Dec 27, 2018, 8:39 PM CST for Choctaw 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
Dec 27, 2018, 8:39 PM CST (02:39 UTC)
Expired
Dec 28, 2018, 2:30 AM CST
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Choctaw County, AL

The radar

The Birmingham radar (KBMX), 158 km from the middle of the area, began a volume at 02:43 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

Jackson, MS (KJAN), launched 00:00Z, 2.7 hours before the alert went out and 191 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2018-12-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2018-12-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

718 
WGUS54 KMOB 280239
FFWMOB
ALC023-280830-
/O.NEW.KMOB.FF.W.0037.181228T0239Z-181228T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
839 PM CST THU DEC 27 2018

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Northern Choctaw County in southwestern Alabama...

* Until 230 AM CST.

* At 837 PM CST, Doppler radar indicated heavy rain across the warned
  area. Up to one inch of rain has already fallen. Flash flooding is
  expected to begin shortly.

* Some locations that will experience flooding include...
  Lisman and Pennington. 

Additional rainfall amounts of two to three 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 8793 3228 8794 3230 8794
      3230 8800 3228 8801 3228 8802 3226 8801
      3218 8801 3215 8802 3214 8804 3210 8805
      3210 8845 3231 8842

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 27, 6:32 PM CSTFlash Flood WarningMOBChoctaw, Clarke, Monroe, Washington, Wilcox6 hr
Dec 27, 6:57 PM CSTRiver Flood WarningMOBCovington, Escambia16 hr
Dec 27, 6:59 PM CSTSpecial Weather StatementMOBClarke46 min
Dec 27, 7:00 PM CSTRiver Flood WarningMOBBaldwin16 hr
Dec 27, 7:05 PM CSTAreal Flood AdvisoryMOBButler, Clarke, Conecuh, Covington, Crenshaw, Monroe and 1 more3 hr
Dec 27, 8:24 PM CSTRiver Flood WarningMOBDallas, Monroe, Wilcox13 days
Dec 27, 8:24 PM CSTRiver Flood WarningMOBClarke, Monroe, Wilcox15 days
Dec 27, 10:02 PM CSTAreal Flood AdvisoryMOBButler, Conecuh, Covington, Crenshaw, Monroe, Wilcox3 hr
Dec 28, 12:29 AM CSTFlash Flood WarningMOBChoctaw, Clarke, Washington3 hr
Dec 28, 2:13 AM CSTMarine Dense Fog AdvisoryMOB16 hr
Dec 28, 2:28 AM CSTSpecial Weather StatementMOBChoctaw47 min
Dec 28, 2:30 AM CSTSevere Thunderstorm WarningMOBChoctaw45 min
Dec 28, 2:47 AM CSTTornado WarningMOBWashington28 min
Dec 28, 3:08 AM CSTSpecial Weather StatementMOBClarke37 min
Dec 28, 3:13 AM CSTSevere Thunderstorm WarningMOBChoctaw, Clarke, Washington19 min
Dec 28, 3:28 AM CSTFlash Flood WarningMOBChoctaw, Clarke, Washington, Wilcox3 hr
Dec 28, 4:12 AM CSTFlash Flood Warning EmergencyMOBChoctaw3 hr
Dec 28, 4:45 AM CSTSevere Thunderstorm WarningMOBMobile, Washington45 min
Dec 28, 4:52 AM CSTAreal Flood AdvisoryMOBMobile, Washington3 hr
Dec 28, 5:20 AM CSTSpecial Weather StatementMOBMobile40 min
Dec 28, 5:51 AM CSTSpecial Marine WarningMOB84 min
Dec 28, 5:54 AM CSTSpecial Weather StatementMOBBaldwin, Mobile66 min
Dec 28, 6:04 AM CSTSpecial Weather StatementMOBMonroe41 min
Dec 28, 6:25 AM CSTAreal Flood WarningMOBChoctaw, Washington6 hr
Dec 28, 6:28 AM CSTFlash Flood WarningMOBClarke, Wilcox3 hr
Dec 28, 8:23 AM CSTSpecial Weather StatementMOBCovington52 min
Dec 28, 8:38 AM CSTSpecial Marine WarningMOB97 min
Dec 28, 8:42 AM CSTSpecial Marine WarningMOB68 min
Dec 28, 9:03 AM CSTAreal Flood WarningMOBChoctaw, Clarke, Washington, Wilcox27 hr
Dec 28, 1:15 PM CSTAreal Flood AdvisoryMOBBaldwin3 hr

Nearby

Flash Flood Warnings in Alabama, 2018Every 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.