Alert archive / Alabama / Special Weather Statements in 2016

Special Weather Statement, NWS Birmingham, AL

August 2, 2016Chilton County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 2, 2016, 2:21 PM CDT for Chilton County, Alabama. It was in force for 39 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 2, 2016, 2:21 PM CDT (19:21 UTC)
Expired: Aug 2, 2016, 3:00 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL

County Chilton County, AL

The radar

The Birmingham radar (KBMX), 31 km from the middle of the area, began a volume at 19:22 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

Birmingham, AL (KBMX), launched 12:00Z, 7.4 hours before the alert went out and 32 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: 680 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

197 
WWUS84 KBMX 021921
SPSBMX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
221 PM CDT TUE AUG 2 2016
 
ALZ025-035-036-022000-
CHILTON AL-COOSA AL-SHELBY AL-
221 PM CDT TUE AUG 2 2016

...SIGNIFICANT WEATHER ADVISORY FOR CHILTON...SOUTHERN SHELBY AND
WESTERN COOSA COUNTIES UNTIL 300 PM CDT...

AT 221 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
LAY LAKE...OR 9 MILES NORTHEAST OF JEMISON...MOVING SOUTHEAST AT 30
MPH.

PEA SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
ALABASTER...CALERA...CLANTON...MONTEVALLO...COLUMBIANA...JEMISON...
WILSONVILLE...THORSBY...WILTON...LYLE...UNIVERSITY OF MONTEVALLO...
CHILTON COUNTY MOTOR SPORTS PARK...HIGGINS FERRY PARK...
POOLES CROSSROADS...LAY LAKE...MARBLE VALLEY...VERBENA...
MITCHELL LAKE...LAY LAKE DAM AND MORIAH.

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.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3297 8688 3305 8688 3306 8691 3316 8694
      3324 8646 3320 8646 3320 8649 3318 8650
      3313 8646 3310 8649 3310 8641 3275 8627
      3275 8632 3277 8634 3275 8634 3275 8641
      3271 8642 3271 8671 3267 8672 3267 8678
TIME...MOT...LOC 1921Z 335DEG 26KT 3302 8659 

$$

32/DAVIS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 7:15 PM CDT	Special Weather Statement	BMX	Shelby	60 min
Aug 1, 7:21 PM CDT	Areal Flood Advisory	BMX	Jefferson, Shelby	114 min
Aug 1, 7:24 PM CDT	Areal Flood Advisory	BMX	St. Clair, Talladega	2 hr
Aug 1, 7:28 PM CDT	Special Weather Statement	BMX	Talladega	47 min
Aug 2, 12:31 PM CDT	Special Weather Statement	BMX	Marion	44 min
Aug 2, 1:03 PM CDT	Special Weather Statement	BMX	Jefferson	42 min
Aug 2, 1:09 PM CDT	Special Weather Statement	BMX	Talladega	51 min
Aug 2, 1:21 PM CDT	Special Weather Statement	BMX	Shelby	54 min
Aug 2, 1:33 PM CDT	Special Weather Statement	BMX	Lamar	27 min
Aug 2, 2:10 PM CDT	Special Weather Statement	BMX	Lamar	50 min
Aug 2, 2:45 PM CDT	Areal Flood Advisory	BMX	Shelby	2 hr
Aug 2, 2:55 PM CDT	Special Weather Statement	BMX	Autauga, Elmore	65 min
Aug 2, 3:16 PM CDT	Special Weather Statement	BMX	Tallapoosa	44 min
Aug 2, 3:24 PM CDT	Special Weather Statement	BMX	Lowndes, Montgomery	66 min
Aug 2, 3:36 PM CDT	Special Weather Statement	BMX	Dallas, Perry	39 min
Aug 2, 3:39 PM CDT	Special Weather Statement	BMX	Macon	51 min
Aug 2, 4:36 PM CDT	Special Weather Statement	BMX	Bullock, Macon, Russell	54 min
Aug 2, 5:09 PM CDT	Special Weather Statement	BMX	Barbour	36 min
Aug 2, 5:37 PM CDT	Special Weather Statement	BMX	Marengo	23 min

Nearby

Special Weather Statements in Alabama, 2016 Every special weather statement in 2016

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.