Alert archive / Alabama / Areal Flood Advisories in 2012

Areal Flood Advisory 87, NWS Mobile, AL

October 18, 2012Clarke County, Alabama

NWS Mobile, AL issued this areal flood advisory at Oct 18, 2012, 4:59 AM CDT for Clarke County, Alabama. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Oct 18, 2012, 4:59 AM CDT (09:59 UTC)
Expired
Oct 18, 2012, 7:00 AM CDT
In force
2 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Clarke County, AL

The radar

The Mobile radar (KMOB), 118 km from the middle of the area, began a volume at 10:01 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, 10.0 hours before the alert went out and 194 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, Birmingham, AL at 00:00Z on 2012-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2012-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1776 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 1:56 AM CDTSevere Thunderstorm WarningMOBChoctaw49 min
Oct 18, 2:39 AM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke51 min
Oct 18, 3:11 AM CDTAreal Flood AdvisoryMOBChoctaw2 hr
Oct 18, 8:23 AM CDTSpecial Marine WarningMOB97 min
Oct 18, 10:19 AM CDTSpecial Marine WarningMOB41 min
Oct 18, 11:01 AM CDTSpecial Marine WarningMOB51 min
Oct 18, 2:28 PM CDTFire Weather WatchMOBButler, Conecuh, Covington, Crenshaw, Escambia15 hr
Oct 18, 5:55 AM CDTFire Weather WatchMOB9 hr
Oct 18, 10:53 AM CDTTornado WarningMOBOkaloosa17 min
Oct 18, 2:28 PM CDTRed Flag WarningMOB29 hr

Nearby

Areal Flood Advisories in Alabama, 2012Every areal flood advisory in 2012

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.