Alert archive / Alabama / Areal Flood Advisories in 2012

Areal Flood Advisory 45, NWS Mobile, AL

July 18, 2012Baldwin County, Alabama

NWS Mobile, AL issued this areal flood advisory at Jul 18, 2012, 2:00 PM CDT for Baldwin County, Alabama. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 18, 2012, 2:00 PM CDT (19:00 UTC)
Expired
Jul 18, 2012, 4:00 PM CDT
In force
2 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 47 km from the middle of the area, began a volume at 18:59 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 12:00Z, 7.0 hours before the alert went out and 192 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 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1179 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 12:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939Sfc1 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
1179 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
946 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 18, 12:39 PM CDT, 1 hour 21 minutes earlier.

Area forecast discussion, Jul 18, 12:39 PM CDT, 1 hour 21 minutes before
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Hazardous weather outlook, Jul 18, 11:55 AM CDT, 2 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MOBILE AL
1155 AM CDT WED JUL 18 2012

ALZ051>064-FLZ001>006-MSZ067-075-076-078-079-191200-
CHOCTAW-WASHINGTON-CLARKE-WILCOX-MONROE-CONECUH-BUTLER-CRENSHAW-
ESCAMBIA-COVINGTON-UPPER MOBILE-UPPER BALDWIN-LOWER MOBILE-
LOWER BALDWIN-INLAND ESCAMBIA-COASTAL ESCAMBIA-INLAND SANTA ROSA-
COASTAL SANTA ROSA-INLAND OKALOOSA-COASTAL OKALOOSA-WAYNE-PERRY-
GREENE-STONE-GEORGE-
1155 AM CDT WED JUL 18 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ALABAMA...SOUTHWEST ALABAMA...NORTHWEST FLORIDA AND SOUTHEAST
MISSISSIPPI.

.DAY ONE...REST OF TODAY AND TONIGHT

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS
THE REGION THROUGH THIS AFTERNOON AND THEN GRADUALLY DIMINISH DURING
THE EVENING HOURS.  ATMOSPHERIC CONDITIONS CONTINUE TO SUPPORT
FREQUENT LIGHTNING...STRONG GUSTY WINDS AND TORRENTIAL DOWNPOURS
WITH THE STRONGER STORMS.  A FEW SEVERE STORMS WILL BE
POSSIBLE...BUT WIDESPREAD ORGANIZED SEVERE WEATHER IS NOT
ANTICIPATED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SCATTERED TO OCCASIONALLY NUMEROUS SHOWERS AND THUNDERSTORMS WILL
REMAIN IN THE FORECAST THROUGH THE WEEKEND AND INTO THE EARLY PART
OF NEXT WEEK. GUSTY WINDS...FREQUENT LIGHTNING AND HEAVY DOWNPOURS
CAN BE EXPECTED WITH ANY OF THE STRONGER THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF SKYWARN SEVERE STORM SPOTTER NETWORKS IS NOT EXPECTED
THROUGH TUESDAY.

GMZ630-650-655-670-675-191200-
MOBILE 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-
1155 AM CDT WED JUL 18 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE COASTAL
WATERS OF ALABAMA AND NORTHWEST FLORIDA.

.DAY ONE...REST OF TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE OVER
THE MARINE AREA THROUGH TONIGHT.  A FEW OF THE STORMS WILL BE
CAPABLE OF PRODUCING STRONG WIND GUSTS AND RESULTANT LOCALLY ROUGHER
SEAS...FREQUENT LIGHTNING...AND POTENTIALLY A FEW WATERSPOUTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THE MARINE
AREA THROUGH THE WEEKEND AND INTO THE EARLY PART OF NEXT WEEK. SOME
OF THE STORMS WILL BE CAPABLE OF PRODUCING STRONG WIND
GUSTS...FREQUENT LIGHTNING...AND POTENTIALLY A FEW WATERSPOUTS.

In the hours before

Special weather statement, Jul 18, 1:42 PM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
142 PM CDT WED JUL 18 2012

ALZ064-181945-
LOWER BALDWIN AL-
142 PM CDT WED JUL 18 2012

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN BALDWIN COUNTY IN
SOUTHWEST ALABAMA...THROUGH 245 PM CDT...

AT 141 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES NORTH OF
GULF SHORES...OR NEAR BON SECOUR...AND MOVING SOUTH AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GULF SHORES...        BON SECOUR...

THE PRIMARY THREATS FROM THIS STORM ARE WIND GUSTS UP TO 55 MPH.
WINDS THIS STRONG COULD BLOW OFF TREE LIMBS AND ALSO BLOW AROUND
SMALL UNSECURED OBJECTS. SEEK SHELTER UNTIL THIS STORM HAS PASSED.
SMALL HAIL IS ALSO POSSIBLE WITH THIS STORM.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. STAY AWAY FROM WINDOWS AND DOORS. AVOID USING TELEPHONES.

&&
Special weather statement, Jul 18, 1:50 PM CDT, 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
150 PM CDT WED JUL 18 2012

ALZ051-181945-
CHOCTAW AL-
150 PM CDT WED JUL 18 2012

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL CHOCTAW COUNTY IN
SOUTHWEST ALABAMA...THROUGH 245 PM CDT...

AT 147 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES WEST OF
BUTLER...OR 6 MILES NORTH OF NEEDHAM...AND MOVING SOUTH AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TOXEY...              NEEDHAM...            GILBERTOWN...
  BUTLER...

THE PRIMARY THREATS FROM THIS STORM ARE WIND GUSTS UP TO 55 MPH.
WINDS THIS STRONG COULD BLOW OFF TREE LIMBS AND ALSO BLOW AROUND
SMALL UNSECURED OBJECTS. SEEK SHELTER UNTIL THIS STORM HAS PASSED.
SMALL HAIL IS ALSO POSSIBLE WITH THIS STORM.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. STAY AWAY FROM WINDOWS AND DOORS. AVOID USING TELEPHONES.

&&

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:04 PM CDTAreal Flood AdvisoryMOBBaldwin, Mobile116 min
Jul 17, 7:40 PM CDTSpecial Marine WarningMOB35 min
Jul 17, 7:46 PM CDTAreal Flood AdvisoryMOBBaldwin119 min
Jul 17, 8:10 PM CDTSpecial Marine WarningMOB65 min
Jul 17, 8:14 PM CDTAreal Flood AdvisoryMOBMobile2 hr
Jul 17, 8:24 PM CDTAreal Flood AdvisoryMOBButler, Conecuh, Covington2 hr
Jul 18, 1:44 PM CDTSpecial Marine WarningMOB91 min
Jul 18, 2:07 PM CDTSpecial Marine WarningMOB53 min
Jul 18, 2:20 PM CDTAreal Flood AdvisoryMOBChoctaw4 hr
Jul 18, 2:23 PM CDTAreal Flood AdvisoryMOBMobile4 hr
Jul 18, 2:27 PM CDTSpecial Marine WarningMOB93 min
Jul 18, 3:15 PM CDTAreal Flood AdvisoryMOBChoctaw2 hr
Jul 18, 3:28 PM CDTAreal Flood AdvisoryMOBMobile2 hr
Jul 18, 4:02 PM CDTSevere Thunderstorm WarningMOBGreene43 min

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.