Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 32, NWS Birmingham, AL

March 1, 2017Jefferson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 1, 2017, 3:28 PM CST for Jefferson County, Alabama. It was in force for 47 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: Mar 1, 2017, 3:28 PM CST (21:28 UTC)
Expired: Mar 1, 2017, 4:15 PM CST
In force: 47 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 64 km from the middle of the area, began a volume at 21:27 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
Mar 1, 3:37 PM CST	HAIL 1	1 Wsw Warrior, AL	.
Mar 1, 3:47 PM CST	HAIL 1	1 Nnw Gardendale, AL	QUARTER-SIZED HAIL REPORTED IN THE GARDENDALE AREA.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 1, 11:48 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.5 hours before the alert went out and 63 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: 246 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 549 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 290 m²/s²
0-3 km storm-relative helicity: 372 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

525 
WUUS54 KBMX 012128
SVRBMX
ALC073-012215-
/O.NEW.KBMX.SV.W.0032.170301T2128Z-170301T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
328 PM CST WED MAR 1 2017

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Northeastern Jefferson County in Alabama...

* Until 415 PM CST

* At 328 PM CST, severe thunderstorms were located along a line
  extending from Arkadelphia to Quinton, moving east at 40 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...
  Trussville, Gardendale, Sumiton, Center Point, Clay, Pinson,
  Adamsville, Argo, Warrior, Kimberly, Graysville, Morris, Brookside,
  Trafford, West Jefferson, County Line, Cardiff, Chalkville, Grayson
  Valley and Sayre.

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 600 PM CST for Alabama.

LAT...LON 3377 8665 3377 8654 3372 8653 3366 8653
      3363 8709 3366 8709 3366 8706 3368 8706
      3369 8704 3373 8704 3377 8702 3377 8701
      3379 8700 3379 8697 3382 8695 3384 8688
      3384 8676
TIME...MOT...LOC 2128Z 266DEG 36KT 3384 8694 3367 8709 

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

87/GRANTHAM

2 follow-up statements

516 
WWUS54 KBMX 012144
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
344 PM CST WED MAR 1 2017

ALC073-012215-
/O.CON.KBMX.SV.W.0032.000000T0000Z-170301T2215Z/
Jefferson AL-
344 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CST
FOR NORTHEASTERN JEFFERSON COUNTY...

At 344 PM CST, severe thunderstorms were located along a line
extending from near Trafford to near Cardiff, moving east at 40 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...
Trussville, Gardendale, Center Point, Clay, Pinson, Adamsville, Argo,
Warrior, Kimberly, Graysville, Morris, Brookside, Trafford, County
Line, Cardiff, Chalkville, Grayson Valley, Palmerdale, Village
Springs and New Castle.

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 600 PM CST for Alabama.

LAT...LON 3363 8702 3384 8684 3384 8676 3377 8665
      3377 8654 3372 8653 3366 8653
TIME...MOT...LOC 2144Z 266DEG 36KT 3385 8676 3368 8691 

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

87/GRANTHAM

191 
WWUS54 KBMX 012205
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
405 PM CST WED MAR 1 2017

ALC073-012215-
/O.CON.KBMX.SV.W.0032.000000T0000Z-170301T2215Z/
Jefferson AL-
405 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CST
FOR NORTHEASTERN JEFFERSON COUNTY...

At 405 PM CST, severe thunderstorms were located along a line
extending from near Inland Lake to Center Point, moving east at 40
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...
Trussville, Center Point, Clay, Pinson, Argo, Chalkville, Grayson
Valley, Palmerdale and Village Springs.

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 600 PM CST for Alabama.

LAT...LON 3365 8673 3377 8663 3377 8654 3372 8653
      3366 8653
TIME...MOT...LOC 2205Z 270DEG 36KT 3382 8652 3365 8667 

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

87/GRANTHAM

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 1, 1:06 PM CST	Severe Thunderstorm Warning	BMX	Marion	24 min
Mar 1, 2:07 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Lamar	38 min
Mar 1, 2:09 PM CST	Special Weather Statement	BMX	Winston	51 min
Mar 1, 2:15 PM CST	Severe Thunderstorm Warning	BMX	Walker, Winston	45 min
Mar 1, 2:37 PM CST	Severe Thunderstorm Warning	BMX	Fayette, Walker	53 min
Mar 1, 2:55 PM CST	Severe Thunderstorm Warning	BMX	Blount	23 min
Mar 1, 3:22 PM CST	Special Weather Statement	BMX	Jefferson	53 min
Mar 1, 3:29 PM CST	Severe Thunderstorm Warning	BMX	Hale	31 min
Mar 1, 3:44 PM CST	Severe Thunderstorm Warning	BMX	Bibb	46 min
Mar 1, 3:48 PM CST	Special Weather Statement	BMX	Jefferson	42 min
Mar 1, 3:55 PM CST	Severe Thunderstorm Warning	BMX	Greene, Sumter	34 min
Mar 1, 4:00 PM CST	Special Weather Statement	BMX	St. Clair	45 min
Mar 1, 4:04 PM CST	Special Weather Statement	BMX	Sumter	56 min
Mar 1, 4:12 PM CST	Severe Thunderstorm Warning	BMX	Hale	48 min
Mar 1, 4:18 PM CST	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair	57 min
Mar 1, 4:21 PM CST	Severe Thunderstorm Warning	BMX	Chilton	42 min
Mar 1, 4:31 PM CST	Special Weather Statement	BMX	Shelby	29 min
Mar 1, 4:42 PM CST	Severe Thunderstorm Warning	BMX	Perry	37 min
Mar 1, 4:49 PM CST	Severe Thunderstorm Warning	BMX	Coosa	56 min
Mar 1, 5:02 PM CST	Severe Thunderstorm Warning	BMX	Cleburne	28 min
Mar 1, 5:51 PM CST	Severe Thunderstorm Warning	BMX	Tallapoosa	24 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.