Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Mobile, AL

August 31, 2017Mobile County, Alabama

NWS Mobile, AL issued this special weather statement at Aug 31, 2017, 4:38 AM CDT for Mobile County, Alabama. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 31, 2017, 4:38 AM CDT (09:38 UTC)
Expired
Aug 31, 2017, 5:15 AM CDT
In force
37 min
Issued by
NWS Mobile, AL

County Mobile County, AL

The radar

The Mobile radar (KMOB), 21 km from the middle of the area, began a volume at 09:39 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, 9.6 hours before the alert went out and 168 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 2017-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 251 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, Slidell Radar S, LA at 00:00Z on 2017-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 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
251 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1133 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.2

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this special weather statement went out at Aug 31, 12:12 AM CDT, 4 hours 26 minutes earlier.

Area forecast discussion, Aug 31, 12:12 AM CDT, 4 hours 26 minutes before
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Hazardous weather outlook, Aug 30, 3:58 PM CDT, 12 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Mobile AL
358 PM CDT Wed Aug 30 2017

ALZ051>060-261>266-FLZ201>206-MSZ067-075-076-078-079-312100-
Choctaw-Washington-Clarke-Wilcox-Monroe-Conecuh-Butler-Crenshaw-
Escambia-Covington-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-Wayne-Perry-Greene-Stone-George-
358 PM CDT Wed Aug 30 2017

This Hazardous Weather Outlook is for portions of south central
Alabama...southwest Alabama...northwest Florida and southeast
Mississippi.

.DAY ONE...This Afternoon and Tonight

Isolated flash flooding is possible, mainly across areas east of
Interstate 65. A Flash Flood Watch is in effect.

High surf and a high risk of rip currents will continue to impact
local beaches. A High Surf Advisory is in effect.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Isolated flash flooding will remain possible through Thursday
morning east of Interstate 65.

High surf and a high risk of rip currents will continue to impact
local beaches through Thursday.

Minor coastal flooding is possible in the typically flood prone
locations Thursday morning during the time of high tide. A Coastal
Flood Advisory is in effect.

.SPOTTER INFORMATION STATEMENT...

Skywarn spotters are encouraged to relay any flooding reports to
the National Weather Service in Mobile.

GMZ630>635-650-655-670-675-312100-
Northern Mobile Bay-Southern Mobile Bay-Mississippi Sound-
Perdido Bay-Pensacola Bay System-Choctawhatchee Bay-
Coastal waters from Pensacola FL to Pascagoula MS out 20 NM-
Coastal waters from Destin to Pensacola FL out 20 NM-
Waters from Pensacola FL to Pascagoula MS from 20 to 60 NM-
Waters from Destin to Pensacola FL from 20 to 60 NM-
358 PM CDT Wed Aug 30 2017

This Hazardous Weather Outlook is for portions of the coastal
waters of Alabama and northwest Florida.

.DAY ONE...This Afternoon and Tonight

A Small Craft Advisory is in effect for strong southerly winds and
high seas.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

A Small Craft Advisory is in effect through Thursday night for
strong southerly winds and high seas.

In the hours before

Special weather statement, Aug 31, 3:11 AM CDT, 1 hour 27 minutes before
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Local storm report, Aug 31, 3:19 AM CDT, 1 hour 19 minutes before
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Local storm report, Aug 31, 3:26 AM CDT, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
326 AM CDT THU AUG 31 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0850 AM     TSTM WND GST     GULF BREEZE             30.36N 87.20W
08/30/2017  M42 MPH          SANTA ROSA         FL   MESONET

            WEATHER FLOW SITE AT GULF BREEZE XGBZ WITHIN 1 MILE OF
            THE COAST RECORDED A 42MPH WIND GUST WITH THUNDERSTORM
            PASSAGE

&&

RROGERS
Special weather statement, Aug 31, 4:38 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Mobile AL
438 AM CDT THU AUG 31 2017

ALZ261-263-265-311015-
Mobile Coastal AL-Mobile Central AL-Mobile Inland AL-
438 AM CDT THU AUG 31 2017

...A STRONG THUNDERSTORM WILL AFFECT THE FOLLOWING COUNTIES...CENTRAL
MOBILE COUNTY UNTIL 515 AM CDT...

At 437 AM CDT, the strong thunderstorm was located near Tillmans
Corner, moving north at 45 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Midtown Mobile, Downtown Mobile, Prichard, Tillmans Corner, Saraland,
Theodore, Chickasaw, Satsuma, Creola, Chunchula, Gulfcrest, Axis,
Semmes, I65 And I165, Mobile Regional Airport, I65 And AL 158 and I10
And I65.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3050 8835 3104 8830 3096 8793 3090 8796
      3089 8798 3088 8797 3088 8798 3087 8798
      3087 8797 3086 8798 3080 8800 3046 8816
TIME...MOT...LOC 0937Z 197DEG 38KT 3059 8824

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 7:31 PM CDTSpecial Weather StatementMOBWashington44 min
Aug 31, 1:17 AM CDTSpecial Marine WarningMOB43 min
Aug 31, 2:17 AM CDTSpecial Marine WarningMOB28 min
Aug 31, 3:11 AM CDTSpecial Weather StatementMOBCovington34 min
Aug 31, 4:40 AM CDTAreal Flood AdvisoryMOBBaldwin3 hr
Aug 31, 4:50 AM CDTAreal Flood AdvisoryMOBCovington3 hr
Aug 31, 6:35 AM CDTAreal Flood AdvisoryMOBBaldwin3 hr
Aug 31, 6:45 AM CDTSpecial Marine WarningMOB60 min
Aug 31, 7:16 AM CDTSpecial Weather StatementMOBCovington59 min
Aug 31, 7:37 AM CDTAreal Flood AdvisoryMOBCovington, Escambia3 hr
Aug 31, 8:00 AM CDTSpecial Marine WarningMOB60 min
Aug 31, 8:01 AM CDTSpecial Weather StatementMOBCovington59 min
Aug 31, 9:02 AM CDTSpecial Marine WarningMOB58 min
Aug 31, 9:06 AM CDTSpecial Marine WarningMOB54 min
Aug 31, 9:46 AM CDTSpecial Marine WarningMOB44 min
Aug 31, 10:00 AM CDTSpecial Marine WarningMOB60 min
Aug 31, 10:20 AM CDTSpecial Weather StatementMOBChoctaw40 min
Aug 31, 11:03 AM CDTSpecial Marine WarningMOB57 min
Aug 31, 11:06 AM CDTSpecial Weather StatementMOBChoctaw39 min
Aug 31, 11:37 AM CDTSevere Thunderstorm WarningMOBChoctaw, Clarke38 min
Aug 31, 12:56 PM CDTSpecial Marine WarningMOB64 min
Aug 31, 3:03 PM CDTRiver Flood WarningMOBCovington, Escambia54 hr
Aug 31, 3:06 PM CDTRiver Flood WarningMOBBaldwin22 hr
Aug 31, 3:46 PM CDTSpecial Weather StatementMOBWilcox14 min
Aug 31, 7:10 AM CDTSpecial Weather StatementMOBSanta Rosa35 min
Aug 31, 9:31 AM CDTSpecial Weather StatementMOBOkaloosa29 min
Aug 31, 9:48 AM CDTSpecial Weather StatementMOBOkaloosa42 min
Aug 31, 10:16 AM CDTFlash Flood WarningMOBOkaloosa3 hr
Aug 31, 10:33 AM CDTRiver Flood WarningMOBOkaloosa3 days
Aug 31, 10:54 AM CDTAreal Flood AdvisoryMOBOkaloosa51 min
Aug 31, 1:36 PM CDTSpecial Weather StatementMOBWayne39 min

Nearby

Special Weather Statements in Alabama, 2017Every special weather statement 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.