Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 2, NWS Mobile, AL

April 15, 2021Mobile County, Alabama

NWS Mobile, AL issued this areal flood warning at Apr 15, 2021, 9:45 AM CDT for Mobile County, Alabama. It was in force for 12 hr. 1 report 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
Apr 15, 2021, 9:45 AM CDT (14:45 UTC)
Expired
Apr 15, 2021, 9:30 PM CDT
In force
12 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Mobile County, AL

The radar

The Mobile radar (KMOB), 37 km from the middle of the area, began a volume at 14:48 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

TimeReportWhereRemark
Apr 15, 12:07 PM CDTFLOOD1 Ese Dauphin Island, ALDAUPHIN ISLAND PD REPORTS MULTIPLE HIGHWAYS AND ROADWAYS REMAIN FLOODED WITH STANDING WATER COVERING THE ROAD.

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.8 hours before the alert went out and 144 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, Slidell Radar S, LA at 12:00Z on 2021-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 231 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2021-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 317 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
231 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
440 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
317 m²/s²
0-3 km storm-relative helicity
375 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.6

Open this sounding in Storm Lab

The text

As transmitted.

055 
WGUS44 KMOB 151445
FLWMOB

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mobile AL
945 AM CDT Thu Apr 15 2021

ALC097-160230-
/O.NEW.KMOB.FA.W.0002.210415T1445Z-210416T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mobile AL-
945 AM CDT Thu Apr 15 2021

The National Weather Service in Mobile has issued a

* Flood Warning for...
  Southwestern Mobile County in southwestern Alabama...

* Until 930 PM CDT Thursday.

* At 945 AM CDT, Doppler radar and automated rain gauges indicated 
  heavy rain has fallen due to thunderstorms. Reports up to six 
  inches have been received across the far southern portion of 
  Mobile County, mostly since Midnight. Flooding is ongoing but will 
  gradually begin to recede this afternoon and into the early 
  evening. The hardest hit areas were generally south of a line from 
  the Theodore Industrial Canal west to where I-10 crosses the 
  Alabama line into Mississippi.

* Flooded yards and water may enter homes that are not elevated. 
  Rushing water near creeks and there have been reports of water 
  flowing over the roadways. The rapid rises will last  maybe 
  another 1 to 2 hours and will replaced with general inundation, or 
  a spreading out of the water.

* Some locations that will experience flooding include...
  Theodore, Grand Bay, Bayou La Batre, Dauphin Island, Coden, 
  Alabama Port, Dixon Corner, Kirewakra, Fowl River, Irvington, 
  South Orchard, Saint Elmo, Laurendine, Delchamps, Smithport, 
  Bayleys Corner, Mon Louis, Faustinas, Belle Fontaine and Sunny 
  Cove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3048 8840 3058 8814 3055 8808 3036 8811
      3033 8814 3027 8811 3024 8807 3024 8811
      3025 8815 3024 8820 3025 8820 3026 8813
      3032 8816 3031 8819 3036 8820 3038 8829
      3036 8830 3039 8833 3038 8840

$$
1 follow-up statement
459 
WGUS84 KMOB 160231
FLSMOB

Flood Statement
National Weather Service Mobile AL
931 PM CDT Thu Apr 15 2021

ALC097-160241-
/O.EXP.KMOB.FA.W.0002.000000T0000Z-210416T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mobile AL-
931 PM CDT Thu Apr 15 2021

...FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN MOBILE COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3048 8840 3058 8814 3055 8808 3036 8811
      3033 8814 3027 8811 3024 8807 3024 8811
      3025 8815 3024 8820 3025 8820 3026 8813
      3032 8816 3031 8819 3036 8820 3038 8829
      3036 8830 3039 8833 3038 8840

$$

BB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 7:13 PM CDTSpecial Marine WarningMOB62 min
Apr 14, 8:24 PM CDTSpecial Marine WarningMOB96 min
Apr 14, 10:00 PM CDTSpecial Marine WarningMOB97 min
Apr 15, 2:17 AM CDTSpecial Weather StatementMOBWashington43 min
Apr 15, 3:05 AM CDTSpecial Marine WarningMOB55 min
Apr 15, 3:23 AM CDTSpecial Weather StatementMOBMobile52 min
Apr 15, 3:42 AM CDTSmall Craft AdvisoryMOB11 hr
Apr 15, 3:48 AM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile42 min
Apr 15, 4:00 AM CDTSpecial Marine WarningMOB45 min
Apr 15, 4:52 AM CDTAreal Flood AdvisoryMOBMobile113 min
Apr 15, 5:00 AM CDTSpecial Marine WarningMOB60 min
Apr 15, 5:13 AM CDTSpecial Weather StatementMOBWashington47 min
Apr 15, 5:19 AM CDTSpecial Weather StatementMOBMobile41 min
Apr 15, 5:23 AM CDTSpecial Marine WarningMOB97 min
Apr 15, 5:55 AM CDTSpecial Marine WarningMOB95 min
Apr 15, 6:31 AM CDTAreal Flood AdvisoryMOBBaldwin, Mobile119 min
Apr 15, 6:36 AM CDTAreal Flood AdvisoryMOBBaldwin, Mobile114 min
Apr 15, 7:01 AM CDTSpecial Marine WarningMOB119 min
Apr 15, 7:04 AM CDTSpecial Weather StatementMOBBaldwin41 min
Apr 15, 7:06 AM CDTSpecial Marine WarningMOB39 min
Apr 15, 7:36 AM CDTFlash Flood WarningMOBBaldwin, Mobile3 hr
Apr 15, 7:40 AM CDTSpecial Marine WarningMOB95 min
Apr 15, 7:45 AM CDTSevere Thunderstorm WarningMOBBaldwin45 min
Apr 15, 7:51 AM CDTSpecial Marine WarningMOB84 min
Apr 15, 7:52 AM CDTSpecial Weather StatementMOBMobile53 min
Apr 15, 8:05 AM CDTSpecial Weather StatementMOBMobile40 min
Apr 15, 8:11 AM CDTSpecial Marine WarningMOB2 hr
Apr 15, 8:52 AM CDTSpecial Marine WarningMOB83 min
Apr 15, 10:14 AM CDTSpecial Marine WarningMOB61 min
Apr 15, 10:48 AM CDTFlash Flood WatchMOBBaldwin, Mobile, Washington62 hr
Apr 15, 11:50 AM CDTAreal Flood WarningMOBBaldwin6 hr

Nearby

Areal Flood Warnings in Alabama, 2021Every areal flood warning in 2021

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.