Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 37, NWS Birmingham, AL

March 1, 2017Calhoun County, St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 1, 2017, 4:18 PM CST for Calhoun County, St. Clair County, Alabama. It was in force for 57 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, 4:18 PM CST (22:18 UTC)
Expired: Mar 1, 2017, 5:15 PM CST
In force: 57 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, AL, St. Clair County, AL

The radar

The Birmingham radar (KBMX), 109 km from the middle of the area, began a volume at 22:21 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, 4:37 PM CST	TSTM WND DMG	3 Sse Neely Henry Dam, AL	TREE DOWNED.
Mar 1, 4:56 PM CST	HAIL 1	1 S Jacksonville, AL	QUARTER-SIZED HAIL REPORTED.

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, 10.3 hours before the alert went out and 109 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.

416 
WUUS54 KBMX 012218
SVRBMX
ALC015-115-012315-
/O.NEW.KBMX.SV.W.0037.170301T2218Z-170301T2315Z/

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

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Calhoun County in east central Alabama...
  Central St. Clair County in Alabama...

* Until 515 PM CST

* At 418 PM CST, severe thunderstorms were located along a line
  extending from Ashville to Branchville, moving east 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...
  Anniston, Jacksonville, Piedmont, Springville, Odenville, Fort
  McClellan, Saks, West End-Cobb Town, Glencoe, Margaret, Weaver,
  Ashville, Ragland, Ohatchee, Blue Mountain, Branchville,
  Alexandria, Jacksonville State University, Neely Henry Lake and
  Logan Martin 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 600 PM CST for northeastern,
east central Alabama.

LAT...LON 3389 8553 3388 8564 3380 8559 3377 8564
      3368 8564 3366 8604 3367 8616 3370 8619
      3366 8617 3364 8649 3384 8632 3389 8611
      3384 8605 3391 8597 3391 8590 3394 8590
      3396 8584 3393 8574 3397 8574 3395 8553
TIME...MOT...LOC 2218Z 265DEG 45KT 3385 8624 3366 8640 

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

87/GRANTHAM

4 follow-up statements

753 
WWUS54 KBMX 012234
SVSBMX

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

ALC015-115-012315-
/O.CON.KBMX.SV.W.0037.000000T0000Z-170301T2315Z/
Calhoun AL-St. Clair AL-
434 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CST
FOR CALHOUN AND CENTRAL ST. CLAIR COUNTIES...

At 434 PM CST, severe thunderstorms were located along a line
extending from Neely Henry Lake to Odenville, moving east 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...
Anniston, Jacksonville, Piedmont, Springville, Odenville, Fort
McClellan, Saks, West End-Cobb Town, Glencoe, Margaret, Weaver,
Ashville, Ragland, Ohatchee, Blue Mountain, Branchville, Alexandria,
Jacksonville State University, Neely Henry Lake and Logan Martin
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 600 PM CST for northeastern,
east central Alabama.

LAT...LON 3389 8553 3388 8564 3380 8559 3377 8564
      3368 8564 3366 8604 3367 8616 3370 8619
      3366 8617 3364 8649 3384 8632 3389 8611
      3384 8605 3391 8597 3391 8590 3394 8590
      3396 8584 3393 8574 3397 8574 3395 8553
TIME...MOT...LOC 2234Z 260DEG 50KT 3382 8605 3368 8639 

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

87/GRANTHAM

721 
WWUS54 KBMX 012247
SVSBMX

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

ALC115-012257-
/O.CAN.KBMX.SV.W.0037.000000T0000Z-170301T2315Z/
St. Clair AL-
447 PM CST WED MAR 1 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ST. CLAIR COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 600 PM CST for northeastern,
east central Alabama.

A severe thunderstorm watch remains in effect until 900 PM CST for
east central Alabama.

LAT...LON 3389 8553 3388 8564 3385 8564 3380 8559
      3377 8564 3368 8564 3366 8604 3367 8605
      3368 8614 3371 8614 3377 8604 3384 8607
      3386 8600 3391 8597 3391 8590 3394 8590
      3396 8584 3393 8574 3397 8574 3395 8553
TIME...MOT...LOC 2247Z 261DEG 37KT 3391 8570 3374 8598 

$$

ALC015-012315-
/O.CON.KBMX.SV.W.0037.000000T0000Z-170301T2315Z/
Calhoun AL-
447 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CST
FOR CALHOUN COUNTY...

At 447 PM CST, severe thunderstorms were located along a line
extending from near Piedmont to near Ohatchee, moving east at 45 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...
Anniston, Jacksonville, Piedmont, Fort McClellan, Saks, West End-Cobb
Town, Glencoe, Weaver, Ohatchee, Blue Mountain, Alexandria, Neely
Henry Lake, Jacksonville State University, Southside, Knightens
Crossroads, Sulphur Springs and Wellington.

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 northeastern,
east central Alabama.

LAT...LON 3389 8553 3388 8564 3385 8564 3380 8559
      3377 8564 3368 8564 3366 8604 3367 8605
      3368 8614 3371 8614 3377 8604 3384 8607
      3386 8600 3391 8597 3391 8590 3394 8590
      3396 8584 3393 8574 3397 8574 3395 8553
TIME...MOT...LOC 2247Z 261DEG 37KT 3391 8570 3374 8598 

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

87/GRANTHAM

831 
WWUS54 KBMX 012254
SVSBMX

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

ALC015-012315-
/O.CON.KBMX.SV.W.0037.000000T0000Z-170301T2315Z/
Calhoun AL-
454 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CST
FOR CENTRAL CALHOUN COUNTY...

At 454 PM CST, a severe thunderstorm was located over Weaver, or near
Jacksonville, moving east at 45 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...
Anniston, Jacksonville, Saks, Fort McClellan, Weaver, Alexandria and
Jacksonville State University.

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 east central
Alabama.

LAT...LON 3389 8557 3387 8564 3385 8564 3380 8559
      3380 8560 3379 8561 3379 8562 3378 8562
      3377 8564 3370 8564 3369 8591 3382 8591
      3390 8553 3389 8553
TIME...MOT...LOC 2254Z 267DEG 40KT 3378 8583 

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

87/GRANTHAM

863 
WWUS54 KBMX 012301
SVSBMX

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

ALC015-012315-
/O.CON.KBMX.SV.W.0037.000000T0000Z-170301T2315Z/
Calhoun AL-
501 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CST
FOR EAST CENTRAL CALHOUN COUNTY...

At 501 PM CST, a severe thunderstorm was located near Jacksonville,
moving east 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...
Jacksonville.

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 east central
Alabama.

LAT...LON 3372 8574 3385 8577 3390 8553 3389 8553
      3389 8557 3387 8564 3385 8564 3380 8559
      3380 8560 3379 8561 3379 8562 3378 8562
      3377 8564 3372 8564
TIME...MOT...LOC 2301Z 264DEG 47KT 3379 8568 

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, 3:28 PM CST	Severe Thunderstorm Warning	BMX	Jefferson	47 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, 4:21 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.