Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 216, NWS Mobile, AL

September 28, 2011Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Sep 28, 2011, 1:48 PM CDT for Mobile County, Alabama. It was in force for 35 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: Sep 28, 2011, 1:48 PM CDT (18:48 UTC)
Expired: Sep 28, 2011, 2:23 PM CDT
In force: 35 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

County Mobile County, AL

The radar

The Mobile radar (KMOB), 9 km from the middle of the area, began a volume at 18:50 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.8 hours before the alert went out and 139 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3518 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

322 
WUUS54 KMOB 281848
SVRMOB
ALC097-281945-
/O.NEW.KMOB.SV.W.0216.110928T1848Z-110928T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
148 PM CDT WED SEP 28 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MOBILE COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 245 PM CDT

* AT 145 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 16
  MILES SOUTH OF LUCEDALE...OR 7 MILES NORTHEAST OF WADE...AND MOVING
  SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TILLMANS CORNER...    THEODORE...           TANNER WILLIAMS...
  I65 AND US 45...      I10 AND I65...        FOREST HILL...
  MOBILE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 9 AND 22.

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 1 AND 8.

&&

LAT...LON 3055 8841 3073 8842 3074 8841 3077 8842
      3081 8841 3074 8808 3048 8812
TIME...MOT...LOC 1848Z 297DEG 19KT 3071 8848

$$

1 follow-up statement

764 
WWUS54 KMOB 281923
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
223 PM CDT WED SEP 28 2011

ALC097-281933-
/O.CAN.KMOB.SV.W.0216.000000T0000Z-110928T1945Z/
MOBILE AL-
223 PM CDT WED SEP 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MOBILE COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS FALLEN BELOW SEVERE LIMITS BUT COULD STILL 
PRODUCE 35 TO 45 MPH WINDS WHICH IS ENOUGH TO UPROOT 
TREES...ESPECIALLY WHERE THE GROUND IS VERY SATURATED.

LAT...LON 3055 8841 3073 8842 3074 8841 3077 8842
      3081 8841 3074 8808 3048 8812
TIME...MOT...LOC 1923Z 297DEG 19KT 3063 8829

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 28, 12:30 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Sep 28, 12:30 PM CDT, 1 hour 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
1230 PM CDT WED SEP 28 2011

.AVIATION [28/18Z ISSUANCE]...IFR TO MVFR CONDITIONS THROUGH 12Z THU.
CEILINGS RANGING FROM 2 TO 5 K FT IN AND AROUND INTENSE DOWNPOURS
TAPERING OFF FROM NORTH TO SOUTH AFTER MIDNIGHT. WINDS WILL BE WEST
10 KNOTS OR LESS MOST OF THE PERIOD BEFORE BECOMING NORTHWEST TO
NORTH AROUND 5 KNOTS OVERNIGHT. 23/JMM

&&

.MOB WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
FL...NONE.
MS...NONE.
GM...NONE.
&&

Hazardous weather outlook, Sep 28, 10:47 AM CDT, 3 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK...UPDATED...
NATIONAL WEATHER SERVICE MOBILE AL
1047 AM CDT WED SEP 28 2011

ALZ051>064-FLZ001>006-GMZ630-650-655-670-675-MSZ067-075-076-078-
079-291200-
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-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-WAYNE-PERRY-
GREENE-STONE-GEORGE-
1047 AM CDT WED SEP 28 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF INTERIOR
SOUTHEAST MISSISSIPPI...SOUTHWEST AND SOUTH CENTRAL ALABAMA...THE
WESTERN FLORIDA PANHANDLE AND THE ADJACENT GULF COASTAL WATERS OF
ALABAMA AND NORTHWEST FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED TO NUMEROUS THUNDERSTORMS EAST OF I-65 WILL EXIT THE AREA
THIS AFTERNOON. ADDITIONAL THUNDERSTORM DEVELOPMENT WILL CONTINUE
THROUGH EARLY AFTERNOON ESPECIALLY FROM ABOUT 15 MILES SOUTH OF
HIGHWAY 84 AND POINTS FURTHER NORTH. BY LATE AFTERNOON AND EARLY
EVENING...YET ANOTHER ROUND OF THUNDERSTORM DEVELOPMENT WILL OCCUR
OVER SOUTHEASTERN MISSISSIPPI AS A SLOW  MOVING UPPER LEVEL IMPULSE
APPROACHES FROM THE WEST. THE PRIMARY THREAT ASSOCIATED WITH THIS
AFTERNOON'S STORMS WILL BE STRAIGHT LINE WINDS AS HIGH AS 65
MPH...FREQUENT CLOUD TO GROUND LIGHTNING AND POSSIBLE SMALL HAIL
WITH SOME LOCATIONS RECEIVING HAIL UP TO ONE INCH IN DIAMETER.

HEAVY RAINFALL IS ALSO POSSIBLE. THE MAIN HEAVY RAINFALL THREAT WILL
COME FIRST FROM INDIVIDUAL THUNDERSTORMS THAT ARE CAPABLE OF
PRODUCING RAINFALL RATES UP TO THREE INCHES PER HOUR. A SECONDARY
THREAT FOR ANY LOCATION COULD OCCUR IF SEVERAL OF THESE STORMS MOVE
OVER THE SAME LOCATION REPEATEDLY. IN ALL...SOME LOCATIONS MAY
RECEIVE UP TO SIX INCHES OF RAINFALL THIS AFTERNOON ON A VERY
ISOLATED BASIS...WITH MOST LOCALES RECEIVING UNDER TWO INCHES.

OVER THE MARINE AREA...GUSTY THUNDERSTORM WINDS IN EXCESS OF 33
KNOTS AND POSSIBLY SOME WATERSPOUTS WILL SERVE AS THE MAIN THREAT AS
STORMS MOVE IN FROM THE WEST...SOMETIMES IN LINES LATER THIS
AFTERNOON AND EARLY EVENING.

THUNDERSTORMS AND HEAVY RAINFALL MAY ENDURE INTO THE MID EVENING
HOURS WHICH IS A LITTLE LONGER THAN USUAL GIVEN THE APPROACH OF A
THE AFOREMENTIONED MID LEVEL IMPULSE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A MODERATE TO STRONG COLD FRONT WILL MOVE ACROSS THE MARINE AREA
FRIDAY NIGHT...GIVING WAY TO HAZARDOUS SEAS FOR SMALL CRAFT SATURDAY
THROUGH EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF SKYWARN SEVERE STORM SPOTTER NETWORKS WILL NOT BE
REQUIRED THROUGH THE PERIOD.

In the hours before

Local storm report, Sep 28, 9:04 AM CDT, 4 hours 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
904 AM CDT WED SEP 28 2011

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

0830 AM     LIGHTNING        5 ENE ORIOLE BEACH      30.41N 87.01W
09/28/2011                   SANTA ROSA         FL   FIRE DEPT/RESCUE

            2 HOUSES STRUCK BY LIGHTNING IN MIDWAY FL. JUST OFF HWY
            98

&&

DONF

Special weather statement, Sep 28, 11:04 AM CDT, 2 hours 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1104 AM CDT WED SEP 28 2011

ALZ053-055-056-059>062-FLZ001-003-005-281700-
CONECUH AL-COVINGTON AL-ESCAMBIA AL-MONROE AL-INLAND OKALOOSA FL-
INLAND SANTA ROSA FL-INLAND ESCAMBIA FL-UPPER BALDWIN AL-CLARKE AL-
UPPER MOBILE AL-
1104 AM CDT WED SEP 28 2011

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CONECUH...COVINGTON...
ESCAMBIA...SOUTHERN MONROE...SOUTHEASTERN CLARKE...NORTHWESTERN
BALDWIN AND NORTHEASTERN MOBILE COUNTIES IN SOUTHWEST ALABAMA...
NORTHWESTERN OKALOOSA...NORTHERN SANTA ROSA AND NORTHERN ESCAMBIA
COUNTIES IN NORTHWEST FLORIDA...THROUGH NOON CDT...

AT 1059 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM MONROEVILLE
TO 10 MILES NORTH OF ATMORE TO 6 MILES NORTHWEST OF SATSUMA...AND
MOVING EAST AT 50PH.

* LOCATIONS IMPACTED INCLUDE...
  WHITFIELD...          MOUNT CARMEL...       FIDELIS...
  DIXONVILLE...         COBBTOWN...           MOVICO...
  POARCH CREEK RESERVATION...                 ROCKVILLE...
  HORN HILL...

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 26 AND 100.

THE PRIMARY THREATS FROM THESE STORMS ARE WIND GUSTS UP TO 50 MPH.
WINDS THIS STRONG COULD BLOW OFF TREE LIMBS AND ALSO BLOW AROUND
SMALL UNSECURED OBJECTS. SEEK SHELTER UNTIL THESE STORMS HAVE PASSED.

SMALL HAIL IS ALSO POSSIBLE WITH THESE STORMS.

&&

Local storm report, Sep 28, 12:30 PM CDT, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
1230 PM CDT WED SEP 28 2011

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

1155 AM     NON-TSTM WND DMG TENSAW                  31.16N 87.80W
09/28/2011                   BALDWIN            AL   EMERGENCY MNGR

            TREES DOWN, 1 ACROSS HIGHWAY 59 SOUTH BOUND NEAR TENSAW.
            APPARENT OUTFLOW FROM DECAYING THUNDERSTORMS

&&

DONF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 7:27 AM CDT	Severe Thunderstorm Warning	MOB	Covington, Crenshaw	48 min
Sep 28, 8:28 AM CDT	Special Marine Warning	MOB		62 min
Sep 28, 9:03 AM CDT	Areal Flood Advisory	MOB	Butler, Conecuh, Covington, Monroe, Wilcox	3 hr
Sep 28, 9:20 AM CDT	Special Marine Warning	MOB		115 min
Sep 28, 9:29 AM CDT	Special Marine Warning	MOB		31 min
Sep 28, 11:13 AM CDT	Special Marine Warning	MOB		47 min
Sep 28, 1:35 PM CDT	Special Marine Warning	MOB		115 min
Sep 28, 1:56 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
Sep 28, 2:43 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	25 min
Sep 28, 2:49 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Mobile	41 min
Sep 28, 3:16 PM CDT	Areal Flood Warning	MOB	Mobile	2 hr
Sep 28, 3:26 PM CDT	Special Marine Warning	MOB		64 min
Sep 28, 3:34 PM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile, Washington	3 hr
Sep 28, 4:16 PM CDT	Special Marine Warning	MOB		59 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

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.