Alert archive / Alabama / Special Weather Statements in 2011

Special Weather Statement, NWS Birmingham, AL

August 4, 2011Sumter County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 4, 2011, 7:15 PM CDT for Sumter County, Alabama. It was in force for 45 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 4, 2011, 7:15 PM CDT (00:15 UTC)
Expired: Aug 4, 2011, 8:00 PM CDT
In force: 45 min
Issued by: NWS Birmingham, AL

County Sumter County, AL

The radar

The Columbus AFB radar (KGWX), 149 km from the middle of the area, began a volume at 00:00 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

Jackson, MS (KJAN), launched 00:00Z, 0.3 hours before the alert went out and 179 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: 661 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 2066 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: -22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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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 Birmingham, AL wrote its last area forecast discussion before this special weather statement went out at Aug 4, 3:20 PM CDT, 3 hours 55 minutes earlier.

Area forecast discussion, Aug 4, 3:20 PM CDT, 3 hours 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
320 PM CDT THU AUG 4 2011

.DISCUSSION...

A TELL OF TWO AIR-MASSES TODAY ACROSS CENTRAL ALABAMA. THE MCS THAT
MOVED THROUGH THIS MORNING LEFT A MCV ACROSS THE AREA AND THIS HAS
TRIGGERED NUMEROUS SHOWERS AND THUNDERSTORMS ESPECIALLY IN THE
NORTHERN HALF OF THE AREA. WHEREAS THE SOUTHERN COUNTIES HAVE BEEN
HOT AND DRY THROUGHOUT THE DAY. MOST OF THE ACTIVITY HAS BEEN
SWINGING AROUND THE UPPER LEVEL RIDGE AS IT BEGINS TO RETREAT TO THE
WEST. ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS ARE DEVELOPING
RIGHT NOW ACROSS NORTHERN MISSISSIPPI AND WESTERN TENNESSEE. THIS
WILL ALSO SLIDE THROUGH THIS AFTERNOON AND EARLY EVENING. WE HAVE
NOT HAD MUCH IN WAY OF REBOUNDING TEMPERATURES ACROSS THE
NORTH...WITH THE EXCEPTION OF THE EXTREME WESTERN MOST COUNTIES. WE
COULD STILL SEE STRONG TO SEVERE STORMS AS THEY INITIALLY MOVE INTO
THE MORE UNSTABLE AIRMASS ACROSS THE NORTHWEST. THINGS SHOULD
DISSIPATE AS THEY MOVE FURTHER INTO CENTRAL ALABAMA AS WE HAVE
REMAINED MORE STABLE EAST OF TUSCALOOSA DUE TO THE RAIN THROUGHOUT
THE DAY.

TONIGHT WE WILL SEE THE RIDGE CONTINUE TO SLIDE WEST AND BE CENTERED
MORE OVER TEXAS AND ARKANSAS...THE MAIN FLOW WILL BE OVER
MISSISSIPPI. THIS SHOULD BE THE MAIN PATH OF ANY MCS THAT DEVELOPS.
WHILE CHANCES ARE MINIMAL OF ANY MCS DEVELOPMENT THIS EVENING...
MODELS ARE NOTORIOUS FOR NOT PICKING THESE UP. SO WE WILL NEED TO
KEEP EYES ON THE UPSTREAM DEVELOPMENT THIS AFTERNOON AND EVENING.
ACTIVITY THAT DEVELOPS CLOSER TO NASHVILLE MAY WORK INTO THE
AREA...WHEREAS ACTIVITY THAT MAY DEVELOP CLOSER TO MEMPHIS SHOULD
SLIDE WEST OF THE AREA.

FOR FRIDAY AND SATURDAY THE RIDGE WILL BEGIN TO HEDGE FURTHER EAST
AND PUT CENTRAL ALABAMA BACK INTO THE SAME AIRMASS AS TODAY AND WE
COULD SEE SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS...WITH THE
BEST CONCENTRATION ACROSS THE SOUTH EACH DAY.

BY SUNDAY...THE MAIN RIDGE BEGINS TO SLIDE EVEN FURTHER TO THE WEST
AND BUILD OVER THE DESERT SOUTHWEST...ALLOWING FOR A TROUGH TO BUILD
OVER THE EAST. BY MIDWEEK A SYNOPTIC BOUNDARY WILL SLIDE CLOSER TO
THE AREA ALONG THE BASE OF THE TROUGH...HELPING INCREASE RAIN
CHANCES ONCE AGAIN.

TEMPERATURES THROUGH THE NEXT SEVEN DAYS SHOULD RESPOND TO THE
WEAKENING RIDGE AND HIGHER RAIN CHANCES BY FALLING INTO THE LOWER TO
MID 90S WITH OVERNIGHT LOWS IN THE UPPER 60S TO MID 70S.

&&

.AVIATION...
18Z TAF DISCUSSION.

CONVECTION CONTINUES ACROSS NORTH ALABAMA WITH ACTIVITY CONTINUING
TO DEVELOP UPSTREAM AS SOUTHWEST LOW LEVEL FLOW FEEDS WARM MOIST AIR
INTO STORMS.  ACTIVITY ACROSS SOUTH ALABAMA HAS FORMED ALONG OUTFLOW
BOUNDARY FROM PREVIOUS ACTIVITY...AND THESE STORMS SHOULD STAY SOUTH
OF KTOI AND KMGM.  SCT TSTMS WILL CONTINUE TO AFFECT NORTHERN TAF
SITES THRU 21Z...BUT SHOULD WEAKEN AFTER 21Z AS LOW LEVEL FLOW
WEAKENS.

BEYOND 21Z...CONFIDENCE IS LOW WITH REGARD TO TIMING OF ADDITIONAL
CONVECTIVE SYSTEMS.  IT IS LIKELY THAT ANOTHER ROUND OF STORMS WILL
AFFECT CENTRAL ALABAMA LATER TONIGHT OR FRIDAY MORNING...BUT TIMING
IS DIFFICULT.  DESPITE MOIST AIR MASS IN PLACE ACROSS AREA DUE TO
RAIN...INTRUSION OF WARM AND DRIER AIR MASS TO THE WEST OF ALABAMA
WILL LIMIT CLOUD COVER...AND CIGS EXPECTED TO STAY MAINLY AOA 5000
FEET AGL.

58/ROSE

&&

.PRELIMINARY POINT TEMPS/POPS...
GADSDEN     70  93  74  93  72 /  30  50  30  50  30
ANNISTON    73  95  73  94  73 /  40  50  30  50  30
BIRMINGHAM  76  96  75  93  74 /  40  50  30  50  30
TUSCALOOSA  77  96  74  95  74 /  30  60  40  50  30
CALERA      74  95  73  93  74 /  40  50  30  50  30
AUBURN      73  94  73  94  74 /  40  60  40  50  30
MONTGOMERY  76  97  75  96  75 /  40  60  40  50  30
TROY        75  96  74  95  74 /  40  60  40  40  30

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

16/58

Hazardous weather outlook, Aug 4, 6:55 PM CDT, 20 minutes before

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In the hours before

Local storm report, Aug 4, 5:04 PM CDT, 2 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
504 PM CDT THU AUG 04 2011

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

0405 PM     TSTM WND DMG     HAMILTON                34.14N 87.98W
08/04/2011                   MARION             AL   EMERGENCY MNGR

            MANY TREES DOWN ACROSS MARION COUNTY.

0415 PM     LIGHTNING        HAMILTON                34.14N 87.98W
08/04/2011                   MARION             AL   EMERGENCY MNGR

            STRUCTURE SET ON FIRE BY LIGHTNING IN HAMILTON.

&&

AG

Special weather statement, Aug 4, 5:11 PM CDT, 2 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
511 PM CDT THU AUG 4 2011

ALZ039-042300-
MARENGO AL-
511 PM CDT THU AUG 4 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MARENGO COUNTY UNTIL
600 PM CDT...

AT 512 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM NEAR NANAFALIA...OR 17 MILES SOUTHWEST OF LINDEN...
MOVING NORTHWEST AT 5 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  MYRTLEWOOD...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 3208 8805 3214 8805 3216 8802 3226 8801
      3229 8803 3231 8799 3231 8794 3218 8787
      3199 8787 3199 8811 3200 8812 3206 8812
TIME...MOT...LOC 2212Z 125DEG 4KT 3215 8802

56

Special weather statement, Aug 4, 5:12 PM CDT, 2 hours 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
512 PM CDT THU AUG 4 2011

ALZ030-042300-
SUMTER AL-
512 PM CDT THU AUG 4 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN SUMTER COUNTY UNTIL 600
PM CDT...

AT 512 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM 6 MILES NORTHEAST OF KINTERBISH...OR 7 MILES SOUTHEAST
OF YORK...MOVING NORTHWEST AT 5 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  YORK...
  CUBA...
  WARD...
  I 20 WELCOME CENTER AT CUBA...
  PAYNEVILLE...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 3264 8839 3249 8801 3245 8801 3243 8803
      3237 8805 3237 8802 3236 8802 3231 8802
      3231 8842 3231 8843
TIME...MOT...LOC 2213Z 125DEG 4KT 3241 8823

56

Local storm report, Aug 4, 5:25 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
525 PM CDT THU AUG 04 2011

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

0520 PM     HAIL             3 NE WARD               32.39N 88.24W
08/04/2011  E0.50 INCH       SUMTER             AL   FIRE DEPT/RESCUE

            DIME SIZE HAIL REPORTED.

&&

08

Special weather statement, Aug 4, 6:48 PM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
648 PM CDT THU AUG 4 2011

ALZ030-050015-
SUMTER AL-
648 PM CDT THU AUG 4 2011

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SUMTER COUNTY UNTIL 715
PM CDT...

AT 643 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM NEAR YORK...MOVING SOUTHWEST AT 5 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.

LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  YORK...
  CUBA...
  KINTERBISH...
  I 20 WELCOME CENTER AT CUBA...
  WARD...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

&&

LAT...LON 3271 8838 3282 8836 3281 8811 3231 8823
      3234 8843
TIME...MOT...LOC 2346Z 029DEG 6KT 3254 8833

61

Special weather statement, Aug 4, 7:15 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 7:02 PM CDT	Areal Flood Advisory	BMX	Sumter	3 hr
Aug 5, 4:23 PM CDT	Special Weather Statement	BMX	Fayette, Lamar, Marion	52 min
Aug 5, 4:28 PM CDT	Areal Flood Advisory	BMX	Fayette, Marion, Walker, Winston	2 hr
Aug 5, 4:56 PM CDT	Areal Flood Advisory	BMX	Lamar	2 hr
Aug 5, 5:13 PM CDT	Special Weather Statement	BMX	Pickens, Walker	47 min

Nearby

Special Weather Statements in Alabama, 2011 Every special weather statement 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.