Alert archive / Alabama / Flash Flood Watches in 2017

Flash Flood Watch 13, NWS Mobile, AL

May 20, 2017Baldwin County, Escambia County, Mobile County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this flash flood watch at May 20, 2017, 8:56 PM CDT for Baldwin County, Escambia County, Mobile County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
May 20, 2017, 8:56 PM CDT (01:56 UTC)
Expired
May 21, 2017, 3:47 AM CDT
In force
7 hr
Issued by
NWS Mobile, AL
Flood severity
None

Counties Baldwin County, AL, Escambia County, AL, Mobile County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 86 km from the middle of the area, began a volume at 01:58 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, 1.9 hours before the alert went out and 232 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°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.

158 
WGUS64 KMOB 210156
FFAMOB

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mobile AL
856 PM CDT Sat May 20 2017

...FLASH FLOOD WATCH FOR LOWER PARTS OF SOUTHWEST ALABAMA AND ALL
AREAS OF NORTHWEST FLORIDA UNTIL 7 AM CDT SUNDAY...

.Heavy rainfall expected over the coastal counties of Alabama and
all areas in Northwest Florida through tonight. Rainfall rates of
2 inches or slightly better per hour are expected with the heavier
thunderstorms through tonight. The best chance for flash flooding
with be generally along and south of a line stretching from north
Mobile County to Brewton in Alabama, including all areas in 
Northwest Florida. 

ALZ059-261>266-FLZ201>206-211000-
/O.NEW.KMOB.FF.A.0013.170521T0156Z-170521T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Escambia-Mobile Inland-Baldwin Inland-Mobile Central-
Baldwin Central-Mobile Coastal-Baldwin Coastal-Escambia Inland-
Escambia Coastal-Santa Rosa Inland-Santa Rosa Coastal-
Okaloosa Inland-Okaloosa Coastal-
Including the cities of Atmore, Brewton, Flomaton, Citronelle, 
Saraland, Stockton, Mobile, Prichard, Theodore, Bay Minette, 
Daphne, Fairhope, Foley, Spanish Fort, Bayou La Batre, 
Dauphin Island, Grand Bay, Fort Morgan, Gulf Shores, 
Orange Beach, Century, Molino, Walnut Hill, Beulah, Ensley, 
Fort Pickens, Pensacola, Pensacola Beach, Perdido Bay, Jay, 
Milton, Bagdad, Gulf Breeze, Navarre, Crestview, Destin, 
Eglin AFB, Fort Walton Beach, Niceville, Seminole, Valparaiso, 
and Wright
856 PM CDT Sat May 20 2017

...FLASH FLOOD WATCH IN EFFECT UNTIL 7 AM CDT SUNDAY...

The National Weather Service in Mobile has issued a

* Flash Flood Watch for portions of Alabama and northwest 
  Florida, including the following areas, in Alabama, Baldwin 
  Central, Baldwin Coastal, Baldwin Inland, Escambia, Mobile 
  Central, Mobile Coastal, and Mobile Inland. In northwest 
  Florida, Escambia Coastal, Escambia Inland, Okaloosa Coastal, 
  Okaloosa Inland, Santa Rosa Coastal, and Santa Rosa Inland. 

* Until 7 AM CDT Sunday

* Heavy rain has occurred for several hours over western sections
  of the watch area and will continue through most of tonight 
  also spreading eastward over Northwest Florida late tonight and 
  early Sunday morning. 

* Additional rainfall totals of 2 to 4 inches will be likely in
  the watch area through tonight with locally higher amounts also
  possible. 

* PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$
1 follow-up statement
454 
WGUS64 KMOB 210847
FFAMOB

Flood Watch
National Weather Service Mobile AL
347 AM CDT Sun May 21 2017

...The Flash Flood Watch Has Been Cancelled...

.The Flash Flood Watch in effect for Coastal Alabama and the
Western Florida Panhandle has been cancelled.

ALZ059-261>266-FLZ201>206-211000-
/O.CAN.KMOB.FF.A.0013.000000T0000Z-170521T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Escambia-Mobile Inland-Baldwin Inland-Mobile Central-
Baldwin Central-Mobile Coastal-Baldwin Coastal-Escambia Inland-
Escambia Coastal-Santa Rosa Inland-Santa Rosa Coastal-
Okaloosa Inland-Okaloosa Coastal-
Including the cities of Atmore, Brewton, Flomaton, Citronelle, 
Saraland, Stockton, Mobile, Prichard, Theodore, Bay Minette, 
Daphne, Fairhope, Foley, Spanish Fort, Bayou La Batre, 
Dauphin Island, Grand Bay, Fort Morgan, Gulf Shores, 
Orange Beach, Century, Molino, Walnut Hill, Beulah, Ensley, 
Fort Pickens, Pensacola, Pensacola Beach, Perdido Bay, Jay, 
Milton, Bagdad, Gulf Breeze, Navarre, Crestview, Destin, 
Eglin AFB, Fort Walton Beach, Niceville, Seminole, Valparaiso, 
and Wright
347 AM CDT Sun May 21 2017

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of Alabama and northwest
Florida has been cancelled. The the heavy rains have subsided over
the watch area, with significant heavy rain not expected through
tonight.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
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, 8:09 PM CDTSpecial Weather StatementMOBBaldwin, Mobile51 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, 9:02 PM CDTFlash Flood WarningMOBBaldwin, Escambia6 hr
May 20, 9:07 PM CDTSpecial Weather StatementMOBBaldwin, Escambia53 min
May 20, 9:23 PM CDTSpecial Marine WarningMOB52 min
May 20, 9:26 PM CDTSpecial Marine WarningMOB2 hr
May 20, 10:21 PM CDTAreal Flood AdvisoryMOBBaldwin, Conecuh, Covington, Escambia3 hr
May 20, 10:25 PM CDTSpecial Weather StatementMOBCovington65 min
May 20, 10:34 PM CDTSpecial Marine WarningMOB116 min
May 20, 10:58 PM CDTSevere Thunderstorm WarningMOBCovington47 min
May 20, 11:14 PM CDTAreal Flood AdvisoryMOBCovington, Crenshaw3 hr
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
May 21, 3:21 PM CDTFlash Flood WatchMOBBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more47 hr
May 20, 10:17 PM CDTSevere Thunderstorm WarningMOBOkaloosa43 min
May 20, 11:30 PM CDTFlash Flood WarningMOBOkaloosa, Santa Rosa6 hr

Nearby

Flash Flood Watches in Alabama, 2017Flash Flood Watches in Florida, 2017Every flash flood watch 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.