Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 100, NWS Birmingham, AL

April 5, 2017Chilton County, Shelby County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 5, 2017, 5:55 PM CDT for Chilton County, Shelby County, Alabama. It was in force for 35 min. 3 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 5, 2017, 5:55 PM CDT (22:55 UTC)
Expired: Apr 5, 2017, 6:30 PM CDT
In force: 35 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chilton County, AL, Shelby County, AL

The radar

The Birmingham radar (KBMX), 21 km from the middle of the area, began a volume at 22:59 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
Apr 5, 5:55 PM CDT	HAIL 0.25	3 Sw Jemison, AL
Apr 5, 5:55 PM CDT	HAIL 1.75	3 Sw Jemison, AL
Apr 5, 5:55 PM CDT	HAIL 2	3 Sw Jemison, AL

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 0 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 5, 1:50 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.9 hours before the alert went out and 22 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: 560 J/kg
Mixed-layer CIN: -102 J/kg
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 408 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

496 
WUUS54 KBMX 052255
SVRBMX
ALC021-117-052330-
/O.NEW.KBMX.SV.W.0100.170405T2255Z-170405T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
555 PM CDT WED APR 5 2017

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  North central Chilton County in Alabama...
  Southeastern Shelby County in Alabama...

* Until 630 PM CDT

* At 555 PM CDT, a severe thunderstorm was located over Jemison,
  moving northeast at 55 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...
  Calera, Columbiana, Jemison, Wilsonville, Thorsby, Shelby, Minooka
  Park, Spring Creek At Lay Lake, Beeswax Creek Park, Waxahatchee At
  Lay Lake, Shelby Shores At Lay Lake, Alabama 4h Center and AlL145
  And CR 46.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 900 PM CDT for east central
Alabama.

LAT...LON 3302 8688 3323 8647 3320 8646 3320 8649
      3317 8650 3316 8648 3315 8648 3313 8646
      3312 8646 3309 8651 3307 8651 3306 8652
      3300 8652 3289 8684
TIME...MOT...LOC 2255Z 230DEG 51KT 3297 8675 

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

89^GSatterwhite

3 follow-up statements

286 
WWUS54 KBMX 052311
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
611 PM CDT WED APR 5 2017

ALC021-117-052330-
/O.CON.KBMX.SV.W.0100.000000T0000Z-170405T2330Z/
Chilton AL-Shelby AL-
611 PM CDT WED APR 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTH CENTRAL CHILTON AND SOUTHEASTERN SHELBY COUNTIES...

At 611 PM CDT, a severe thunderstorm was located near Columbiana,
moving northeast at 50 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...
Wilsonville, Shelby, Spring Creek At Lay Lake, Beeswax Creek Park,
Waxahatchee At Lay Lake, Shelby Shores At Lay Lake, Alabama 4h Center
and AlL145 And CR 46.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 900 PM CDT for east central
Alabama.

LAT...LON 3306 8672 3323 8647 3320 8646 3320 8649
      3317 8650 3316 8648 3315 8648 3313 8646
      3312 8646 3309 8651 3307 8651 3306 8652
      3302 8652 3299 8669
TIME...MOT...LOC 2311Z 237DEG 44KT 3309 8659 

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

89^GSatterwhite

850 
WWUS54 KBMX 052319
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
619 PM CDT WED APR 5 2017

ALC021-052329-
/O.CAN.KBMX.SV.W.0100.000000T0000Z-170405T2330Z/
Chilton AL-
619 PM CDT WED APR 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CHILTON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 900 PM CDT for east central
Alabama.

LAT...LON 3319 8650 3317 8650 3316 8648 3315 8648
      3312 8646 3312 8648 3309 8651 3307 8652
      3307 8655 3306 8660 3307 8661 3310 8661
TIME...MOT...LOC 2319Z 230DEG 51KT 3317 8648 

$$

ALC117-052330-
/O.CON.KBMX.SV.W.0100.000000T0000Z-170405T2330Z/
Shelby AL-
619 PM CDT WED APR 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHEASTERN SHELBY COUNTY...

At 619 PM CDT, a severe thunderstorm was located near Talladega
Springs, moving northeast at 60 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...
Shelby, Spring Creek At Lay Lake, Beeswax Creek Park, Alabama 4h
Center, AlL145 And CR 46 and Shelby Shores At Lay Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 900 PM CDT for east central
Alabama.

LAT...LON 3319 8650 3317 8650 3316 8648 3315 8648
      3312 8646 3312 8648 3309 8651 3307 8652
      3307 8655 3306 8660 3307 8661 3310 8661
TIME...MOT...LOC 2319Z 230DEG 51KT 3317 8648 

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

89^GSatterwhite

650 
WWUS54 KBMX 052327
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
627 PM CDT WED APR 5 2017

ALC117-052337-
/O.EXP.KBMX.SV.W.0100.000000T0000Z-170405T2330Z/
Shelby AL-
627 PM CDT WED APR 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SHELBY COUNTY
WILL EXPIRE AT 630 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 900 PM CDT for east central
Alabama.

LAT...LON 3319 8650 3317 8650 3316 8648 3315 8648
      3312 8646 3312 8648 3309 8651 3307 8652
      3307 8655 3306 8660 3307 8661 3310 8661
TIME...MOT...LOC 2327Z 230DEG 51KT 3324 8639 

$$

89^GSatterwhite

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Apr 5, 1:13 PM CDT, 4 hours 42 minutes earlier.

Area forecast discussion, Apr 5, 1:13 PM CDT, 4 hours 42 minutes before

Area Forecast Discussion
National Weather Service Birmingham AL
113 PM CDT Wed Apr 5 2017

.UPDATE...
For 18Z Aviation.

&&

.DISCUSSION...

Effective warm front roughly positioned from northern Sumter
County northeast across southern Bibb County east across southern
Talladega County and into southern Cleburne County.

The airmass is continuing to rapidly destabilize south of the warm
front with temperatures in the low to mid 70's along the U.S.
Highway 80 corridor along with dew points in the lower 70's
across our southern tier of counties.

We continue to monitor the potential for large hail with
thunderstorms near and north of the warm front and for the
increasing potential of all convective hazards to the southwest
across southern Alabama.

Our concern continues to increase with discrete storms moving out
of Clarke and Monroe Counties and into Wilcox County while
additional discrete storms are moving out of Escambia and Conecuh
Counties and into Covington County. These storms will pose a
threat to Selma/Montgomery/Troy areas through the next few hours.

Visible satellite imagery indicates some breaks in the clouds from
Washington County north to Tuscaloosa County. Solar radiation will
help to further raise temperatures and will result in further
airmass destabilization through the remainder of the morning
hours across our western and southwest counties.

The latest derived hodograph from the KBMX radar velocity wind
profile indicates 0-6 km bulk shear of 54 knots and 0-1 km storm
relative helicities of 108 m2/s2. The environment remains
supportive of severe thunderstorms and tornadoes south of the warm
front.

05

&&

.AVIATION...
18Z TAF Discussion.

Except for a small line of TSRA moving northeast toward/thru
ASN/ANB over the next hour or so, we are in a lull in the activity
for the most part with the activity expected to pick back up in
the 21-23z time frame ahead of our approaching front. Some storms
could be strong to severe late this afternoon into the early
evening. Winds are expected to shift and remain gusty tonight
behind the front. Overall VFR cigs are expected outside of
convection.

08

&&

.FIRE WEATHER...

A storm system will bring rain and thunderstorms to the area
through tonight. Rain-free weather returns Thursday through the
weekend. Critical fire weather conditions are not expected through
the next 7 days.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     47  61  40  62  36 /  50  20  10   0   0
Anniston    48  61  40  63  38 /  60  20  10   0   0
Birmingham  47  62  43  63  39 /  30  20  10   0   0
Tuscaloosa  47  65  43  65  39 /  30  10   0   0   0
Calera      48  63  43  64  40 /  30  10  10   0   0
Auburn      50  62  42  62  40 /  60  10  10   0   0
Montgomery  51  68  44  66  41 /  60  10   0   0   0
Troy        52  66  43  65  39 /  60  10   0   0   0

&&

.BMX WATCHES/WARNINGS/ADVISORIES/...
None.

&&

05/08

Hazardous weather outlook, Apr 5, 4:54 PM CDT, 1 hour 1 minute before

Hazardous Weather Outlook
National Weather Service Birmingham AL
454 PM CDT Wed Apr 5 2017

ALZ011>015-017>050-070100-
Marion-Lamar-Fayette-Winston-Walker-Blount-Etowah-Calhoun-Cherokee-
Cleburne-Pickens-Tuscaloosa-Jefferson-Shelby-St. Clair-Talladega-
Clay-Randolph-Sumter-Greene-Hale-Perry-Bibb-Chilton-Coosa-Tallapoosa-
Chambers-Marengo-Dallas-Autauga-Lowndes-Elmore-Montgomery-Macon-
Bullock-Lee-Russell-Pike-Barbour-
454 PM CDT Wed Apr 5 2017

This Hazardous Weather Outlook is for the counties served by the
National Weather Service office in Birmingham.

.DAY ONE...Outlook Through Tonight.

Severe thunderstorms will be possible along an approaching cold
front across all of Central Alabama with tornadoes, damaging
straight line winds, and large hail all possible. The best chances
for severe thunderstorms along with strong tornadoes will be along,
north, and east of an Oneonta to Lake Martin to Opelika line. The
threat will end from west to east after the front moves through and
could go to as late as 9 PM across the far eastern counties.

Behind the storms and the front look for windy conditions with
sustained winds of 20 to 30 mph and gusts of 30 to 40 mph possible
at times after around 10 PM.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Windy conditions will continue to be possible during the daytime
hours through around 7 PM.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management will be
necessary through this evening.

08

In the hours before

Local storm report, Apr 5, 5:42 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
542 PM CDT WED APR 5 2017

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

0540 PM     HAIL             RIVERCHASE GALLERIA     33.38N 86.82W
04/05/2017  E1.00 INCH       JEFFERSON          AL   PUBLIC

&&

MAL

Local storm report, Apr 5, 5:46 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
546 PM CDT WED APR 5 2017

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

0546 PM     HAIL             1 S VESTAVIA HILLS      33.42N 86.78W
04/05/2017  E1.00 INCH       JEFFERSON          AL   PUBLIC

&&

MAL

Local storm report, Apr 5, 5:47 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
547 PM CDT WED APR 5 2017

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

0540 PM     HAIL             2 ESE HOOVER            33.40N 86.78W
04/05/2017  E0.50 INCH       JEFFERSON          AL   AMATEUR RADIO

&&

MAL

Local storm report, Apr 5, 5:52 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
552 PM CDT WED APR 5 2017

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

0552 PM     HAIL             CAHABA HEIGHTS          33.46N 86.73W
04/05/2017  E1.75 INCH       JEFFERSON          AL   PUBLIC

&&

MAL

Local storm report, Apr 5, 5:54 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
554 PM CDT WED APR 5 2017

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

0550 PM     HAIL             1 S THE SUMMIT          33.44N 86.73W
04/05/2017  E1.75 INCH       JEFFERSON          AL   EMERGENCY MNGR

            COLONNADE SHOPPING AREA.

&&

MAL

Local storm report, Apr 5, 5:55 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
555 PM CDT WED APR 5 2017

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

0555 PM     HAIL             3 SW JEMISON            32.94N 86.77W
04/05/2017  E0.25 INCH       CHILTON            AL   PUBLIC

&&

MAL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 1:24 AM CDT	Severe Thunderstorm Warning	BMX	Barbour	66 min
Apr 5, 2:04 AM CDT	Severe Thunderstorm Warning	BMX	Barbour, Pike	56 min
Apr 5, 2:44 AM CDT	Severe Thunderstorm Warning	BMX	Russell	32 min
Apr 5, 3:32 AM CDT	Severe Thunderstorm Warning	BMX	Russell	43 min
Apr 5, 3:35 AM CDT	Severe Thunderstorm Warning	BMX	Hale, Perry	40 min
Apr 5, 3:54 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Tuscaloosa	34 min
Apr 5, 3:57 AM CDT	Severe Thunderstorm Warning	BMX	Autauga, Lowndes, Montgomery	33 min
Apr 5, 4:11 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Perry	49 min
Apr 5, 4:45 AM CDT	Severe Thunderstorm Warning	BMX	Chilton, Shelby	44 min
Apr 5, 5:22 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Clay, Cleburne, Talladega	38 min
Apr 5, 5:24 AM CDT	Severe Thunderstorm Warning	BMX	Chambers, Tallapoosa	51 min
Apr 5, 6:02 AM CDT	Severe Thunderstorm Warning	BMX	Clay, Randolph	58 min
Apr 5, 6:04 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Hale, Perry	56 min
Apr 5, 6:52 AM CDT	Severe Thunderstorm Warning	BMX	Shelby	83 min
Apr 5, 7:22 AM CDT	Areal Flood Advisory	BMX	Greene, Pickens, Sumter, Tuscaloosa	3 hr
Apr 5, 7:40 AM CDT	Areal Flood Advisory	BMX	Blount, Jefferson	3 hr
Apr 5, 8:43 AM CDT	Areal Flood Advisory	BMX	Calhoun, St. Clair, Shelby, Talladega	3 hr
Apr 5, 9:00 AM CDT	Severe Thunderstorm Warning	BMX	Dallas, Lowndes	75 min
Apr 5, 9:13 AM CDT	Special Weather Statement	BMX	Cleburne	32 min
Apr 5, 9:35 AM CDT	Severe Thunderstorm Warning	BMX	Barbour, Pike	70 min
Apr 5, 10:16 AM CDT	Severe Thunderstorm Warning	BMX	Montgomery	29 min
Apr 5, 10:29 AM CDT	Areal Flood Advisory	BMX	Calhoun, Clay, Cleburne, Randolph	3 hr
Apr 5, 10:38 AM CDT	Severe Thunderstorm Warning	BMX	Elmore, Macon, Tallapoosa	67 min
Apr 5, 10:56 AM CDT	Severe Thunderstorm Warning	BMX	Barbour	49 min
Apr 5, 11:43 AM CDT	Severe Thunderstorm Warning	BMX	Bibb, Tuscaloosa	32 min
Apr 5, 11:55 AM CDT	Severe Thunderstorm Warning	BMX	Shelby	66 min
Apr 5, 12:53 PM CDT	Special Weather Statement	BMX	Talladega	82 min
Apr 5, 1:42 PM CDT	Special Weather Statement	BMX	Cleburne	33 min
Apr 5, 2:35 PM CDT	Special Weather Statement	BMX	Cleburne	25 min
Apr 5, 3:03 PM CDT	Special Weather Statement	BMX	Talladega	42 min
Apr 5, 3:22 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Talladega	38 min
Apr 5, 3:48 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cleburne, Talladega	67 min
Apr 5, 4:08 PM CDT	Tornado Warning	BMX	Cleburne	52 min
Apr 5, 4:10 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Etowah	45 min
Apr 5, 4:37 PM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	26 hr
Apr 5, 4:59 PM CDT	Special Weather Statement	BMX	Randolph	46 min
Apr 5, 5:30 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, Shelby	45 min
Apr 5, 5:32 PM CDT	Special Weather Statement	BMX	Randolph	13 min
Apr 5, 5:33 PM CDT	Special Weather Statement	BMX	Randolph, Tallapoosa	57 min
Apr 5, 5:56 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair	40 min
Apr 5, 6:03 PM CDT	Severe Thunderstorm Warning	BMX	Randolph	27 min
Apr 5, 6:17 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	43 min
Apr 5, 6:20 PM CDT	Special Weather Statement	BMX	DeKalb	25 min
Apr 5, 6:32 PM CDT	Severe Thunderstorm Warning	BMX	St. Clair, Shelby, Talladega	27 min
Apr 5, 6:35 PM CDT	Severe Thunderstorm Warning	BMX	Etowah	25 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.