Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Birmingham, AL

April 3, 2017Jefferson County, Alabama

NWS Birmingham, AL issued this special weather statement at Apr 3, 2017, 1:21 AM CDT for Jefferson 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: Apr 3, 2017, 1:21 AM CDT (06:21 UTC)
Expired: Apr 3, 2017, 2:00 AM CDT
In force: 39 min
Issued by: NWS Birmingham, AL

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 36 km from the middle of the area, began a volume at 06:24 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 00:00Z, 6.4 hours before the alert went out and 35 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2582 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

758 
WWUS84 KBMX 030621
SPSBMX

Special Weather Statement
National Weather Service Birmingham AL
121 AM CDT MON APR 3 2017
 
ALZ024-025-030700-
Jefferson AL-Shelby AL-
121 AM CDT MON APR 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SHELBY AND JEFFERSON
COUNTIES UNTIL 200 AM CDT...

At 121 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Concord to 6 miles northwest of Wilton.
Movement was northeast at 45 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Birmingham, Hoover, Vestavia Hills, Alabaster, Bessemer, Homewood,
Pelham, Mountain Brook, Trussville, Helena, Hueytown, Gardendale,
Irondale, Leeds, Moody, Fairfield, Chelsea, Fultondale,
Pinson-Clay-chalkv and Center Point.

LAT...LON 3377 8665 3376 8654 3374 8654 3372 8653
      3366 8653 3362 8655 3356 8655 3355 8648
      3350 8648 3350 8638 3346 8638 3313 8697
      3316 8698 3317 8702 3325 8703 3325 8707
      3328 8707 3328 8709 3343 8718 3384 8676
TIME...MOT...LOC 0621Z 224DEG 40KT 3348 8702 3314 8698 

$$

87/GRANTHAM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 12:41 AM CDT	Special Weather Statement	BMX	Bibb	34 min
Apr 3, 3:39 AM CDT	Severe Thunderstorm Warning	BMX	Sumter	51 min
Apr 3, 4:10 AM CDT	Severe Thunderstorm Warning	BMX	Greene, Hale, Marengo	65 min
Apr 3, 5:09 AM CDT	Special Weather Statement	BMX	Dallas, Perry	66 min
Apr 3, 6:04 AM CDT	Special Weather Statement	BMX	Autauga, Bibb, Chilton, Lowndes	56 min
Apr 3, 6:46 AM CDT	Special Weather Statement	BMX	Autauga, Chilton, Lowndes, Shelby	29 min
Apr 3, 7:58 AM CDT	Special Weather Statement	BMX	Clay, Coosa, Elmore, Montgomery, Talladega, Tallapoosa	77 min
Apr 3, 8:06 AM CDT	River Flood Warning	BMX	Sumter	53 hr
Apr 3, 8:58 AM CDT	Severe Thunderstorm Warning	BMX	Montgomery, Pike	47 min
Apr 3, 9:06 AM CDT	Special Weather Statement	BMX	Chambers, Lee, Macon, Randolph	54 min
Apr 3, 9:07 AM CDT	Special Weather Statement	BMX	Chambers, Randolph	53 min
Apr 3, 9:40 AM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock	80 min
Apr 3, 9:58 AM CDT	Special Weather Statement	BMX	Russell	62 min
Apr 3, 3:12 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Pickens, Sumter	50 hr
Apr 3, 3:28 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo	5 days
Apr 3, 3:35 PM CDT	River Flood Warning	BMX	Greene, Hale, Marengo, Sumter	5 days

Nearby

Special Weather Statements in Alabama, 2017 Every special weather statement in 2017

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.