Alert archive / Alabama / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 39, NWS Birmingham, AL

April 29, 2016Chilton County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 29, 2016, 7:35 PM CDT for Chilton County, Alabama. It was in force for 18 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 29, 2016, 7:35 PM CDT (00:35 UTC)
Expired: Apr 29, 2016, 7:53 PM CDT
In force: 18 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Chilton County, AL

The radar

The Birmingham radar (KBMX), 36 km from the middle of the area, began a volume at 00:34 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.

What was reported inside it

Time	Report	Where	Remark
Apr 29, 7:38 PM CDT	HAIL 0.88	1 Se Clanton, AL	NICKEL-SIZED HAIL REPORTED AT THE COUNTRY CLUB.
Apr 29, 7:38 PM CDT	HAIL 1	Clanton, AL	PHOTO OF QUARTER-SIZED HAIL VIA SOCIAL MEDIA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 0.6 hours before the alert went out and 38 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: 1473 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1390 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

103 
WUUS54 KBMX 300035
SVRBMX
ALC021-300115-
/O.NEW.KBMX.SV.W.0039.160430T0035Z-160430T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
735 PM CDT FRI APR 29 2016

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CHILTON COUNTY IN CENTRAL ALABAMA...

* UNTIL 815 PM CDT

* AT 735 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CLANTON...
  MOVING NORTHEAST AT 10 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  CLANTON...JEMISON...THORSBY...GAP OF THE MOUNTAIN...MITCHELL LAKE...
  ISABELLA...I 65 REST AREA AND LOMAX.

THIS INCLUDES INTERSTATE 65 BETWEEN MILE MARKERS 205 AND 219.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3283 8682 3306 8666 3296 8652 3292 8651
      3291 8649 3287 8648 3287 8646 3286 8645
      3272 8665
TIME...MOT...LOC 0035Z 220DEG 7KT 3284 8669 

HAIL...1.00IN
WIND...60MPH
 
$$

32/DAVIS

1 follow-up statement

858 
WWUS54 KBMX 300053
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
753 PM CDT FRI APR 29 2016

ALC021-300103-
/O.CAN.KBMX.SV.W.0039.000000T0000Z-160430T0115Z/
CHILTON AL-
753 PM CDT FRI APR 29 2016

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHILTON COUNTY IS
CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3283 8682 3306 8666 3296 8652 3292 8651
      3291 8649 3287 8648 3287 8646 3286 8645
      3272 8665
TIME...MOT...LOC 0048Z 220DEG 7KT 3287 8666 

$$

32/DAVIS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:15 PM CDT	Special Weather Statement	BMX	Hale	45 min
Apr 29, 7:20 PM CDT	Special Weather Statement	BMX	Elmore	40 min
Apr 29, 7:56 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Macon, Montgomery	49 min
Apr 29, 8:06 PM CDT	Special Weather Statement	BMX	Perry	39 min
Apr 29, 8:45 PM CDT	Special Weather Statement	BMX	Elmore, Macon	45 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2016 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.