Alert archive / Alabama / Flash Flood Warnings in 2017

Flash Flood Warning 16, NWS Mobile, AL

May 20, 2017Escambia County, Florida; Baldwin County, Escambia County, Alabama

NWS Mobile, AL issued this flash flood warning at May 20, 2017, 9:02 PM CDT for Escambia County, Florida; Baldwin County, Escambia 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
May 20, 2017, 9:02 PM CDT (02:02 UTC)
Expired
May 21, 2017, 3:00 AM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

Counties Baldwin County, AL, Escambia County, AL, Escambia County, FL

The radar

The Mobile radar (KMOB), 68 km from the middle of the area, began a volume at 02:03 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 00:00Z, 2.0 hours before the alert went out and 211 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 00:00Z on 2017-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3071 joules per kilogram.LCLEL10008507005003002001001 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, Slidell Radar S, LA at 00:00Z on 2017-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.193958Sfc1 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
3071 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
745 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

505 
WGUS54 KMOB 210202
FFWMOB
ALC003-053-FLC033-210800-
/O.NEW.KMOB.FF.W.0016.170521T0202Z-170521T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
902 PM CDT SAT MAY 20 2017

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Central Baldwin County in southwestern Alabama...
  Western Escambia County in south central Alabama...
  Northwestern Escambia County in northwestern Florida...

* Until 300 AM CDT Sunday

* At 859 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 1 to 3 inches of rain have 
  already fallen, and additional heavy rain will continue to move 
  into the warned area over the next couple of hours. Flash flooding 
  is expected to begin shortly.

* Some locations that will experience flooding include...
  Bay Minette, Atmore, Spanish Fort, Stockton, McCullough, Stapleton,
  I65 And AL 225, I65 And CR 1, I65 And AL 21 and Poarch Creek
  Reservation.

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 3060 8803 3095 8789 3095 8787 3096 8788
      3128 8782 3127 8780 3128 8778 3129 8779
      3130 8778 3130 8771 3126 8767 3124 8764
      3124 8759 3123 8756 3124 8754 3124 8747
      3111 8743 3065 8749

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 8:09 PM CDTSpecial Weather StatementMOBEscambia51 min
May 20, 8:56 PM CDTFlash Flood WatchMOBEscambia, Okaloosa, Santa Rosa7 hr
May 20, 9:07 PM CDTSpecial Weather StatementMOBEscambia, Santa Rosa53 min
May 20, 10:17 PM CDTSevere Thunderstorm WarningMOBOkaloosa43 min
May 20, 10:21 PM CDTAreal Flood AdvisoryMOBEscambia, Okaloosa, Santa Rosa3 hr
May 20, 10:25 PM CDTSpecial Weather StatementMOBOkaloosa, Santa Rosa65 min
May 20, 10:58 PM CDTSevere Thunderstorm WarningMOBOkaloosa47 min
May 20, 11:14 PM CDTAreal Flood AdvisoryMOBOkaloosa3 hr
May 20, 11:30 PM CDTFlash Flood WarningMOBOkaloosa, Santa Rosa6 hr
May 21, 3:21 PM CDTFlash Flood WatchMOBEscambia, Okaloosa, Santa Rosa47 hr
May 20, 7:06 PM CDTAreal Flood AdvisoryMOBMobile3 hr
May 20, 7:19 PM CDTSpecial Weather StatementMOBMobile41 min
May 20, 7:38 PM CDTFlash Flood WarningMOBMobile6 hr
May 20, 7:46 PM CDTSpecial Weather StatementMOBMobile44 min
May 20, 8:12 PM CDTSpecial Weather StatementMOBBaldwin48 min
May 20, 8:17 PM CDTSpecial Marine WarningMOB88 min
May 20, 8:21 PM CDTSevere Thunderstorm WarningMOBMobile39 min
May 20, 8:25 PM CDTFlash Flood WarningMOBMobile6 hr
May 20, 9:23 PM CDTSpecial Marine WarningMOB52 min
May 20, 9:26 PM CDTSpecial Marine WarningMOB2 hr
May 20, 10:34 PM CDTSpecial Marine WarningMOB116 min
May 20, 11:40 PM CDTSpecial Marine WarningMOB2 hr
May 20, 11:59 PM CDTAreal Flood WarningMOBBaldwin, Clarke, Mobile, Washington12 hr
May 21, 12:18 AM CDTSpecial Marine WarningMOB57 min
May 21, 1:30 AM CDTAreal Flood WarningMOBMobile12 hr
May 21, 1:55 AM CDTSpecial Marine WarningMOB95 min

Nearby

Flash Flood Warnings in Alabama, 2017Flash Flood Warnings in Florida, 2017Every flash flood warning in 2017

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.