Alert archive / Alabama / Special Weather Statements in 2016

Special Weather Statement, NWS Birmingham, AL

August 2, 2016Shelby County, Alabama

NWS Birmingham, AL issued this special weather statement at Aug 2, 2016, 1:21 PM CDT for Shelby County, Alabama. It was in force for 54 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, 1:21 PM CDT (18:21 UTC)
Expired: Aug 2, 2016, 2:15 PM CDT
In force: 54 min
Issued by: NWS Birmingham, AL

County Shelby County, AL

The radar

The Birmingham radar (KBMX), 13 km from the middle of the area, began a volume at 18:22 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, 6.4 hours before the alert went out and 14 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.

238 
WWUS84 KBMX 021821
SPSBMX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
121 PM CDT TUE AUG 2 2016
 
ALZ025-021915-
SHELBY AL-
121 PM CDT TUE AUG 2 2016

...SIGNIFICANT WEATHER ADVISORY FOR SHELBY COUNTY UNTIL 215 PM CDT...

AT 120 PM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM NEAR CONCORD TO NEAR VANDIVER. MOVEMENT
WAS SOUTH AT 25 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
HOOVER...ALABASTER...PELHAM...HELENA...CALERA...CHELSEA...
MONTEVALLO...COLUMBIANA...WILSONVILLE...INDIAN SPRINGS VILLAGE...
HARPERSVILLE...WILTON...UNIVERSITY OF MONTEVALLO...LAKE PURDY...
GREYSTONE...MEADOWBROOK...LAY LAKE...OAK MOUNTAIN STATE PARK...
MAYLENE AND SHELBY COUNTY AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH
FLOODED ROADWAYS.

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

&&

LAT...LON 3351 8654 3330 8656 3331 8636 3328 8643
      3320 8646 3319 8650 3312 8646 3309 8651
      3302 8652 3306 8661 3306 8662 3307 8661
      3306 8693 3316 8697 3317 8703 3325 8703
      3333 8688 3333 8683 3347 8667 3347 8661
TIME...MOT...LOC 1820Z 349DEG 23KT 3345 8708 3349 8655 

$$

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, 1:33 PM CDT	Special Weather Statement	BMX	Lamar	27 min
Aug 2, 2:10 PM CDT	Special Weather Statement	BMX	Lamar	50 min
Aug 2, 2:21 PM CDT	Special Weather Statement	BMX	Chilton	39 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.