Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 2, NWS Birmingham, AL

January 2, 2017Jefferson County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jan 2, 2017, 9:13 AM CST for Jefferson County, Alabama. It was in force for 30 min. 1 report 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: Jan 2, 2017, 9:13 AM CST (15:13 UTC)
Expired: Jan 2, 2017, 9:43 AM CST
In force: 30 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 60 km from the middle of the area, began a volume at 15:16 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
Jan 2, 9:15 AM CST	HAIL 0.5	2 Wnw Fairfield, AL	.

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 12:00Z, 3.2 hours before the alert went out and 59 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: 11 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 587 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

651 
WUUS54 KBMX 021513
SVRBMX
ALC073-021600-
/O.NEW.KBMX.SV.W.0002.170102T1513Z-170102T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
913 AM CST MON JAN 2 2017

The National Weather Service in Birmingham has issued a

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

* Until 1000 AM CST

* At 913 AM CST, a severe thunderstorm was located over Pleasant
  Grove, or near Fairfield, moving northeast at 40 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* Locations impacted include...
  Birmingham, Bessemer, Homewood, Trussville, Hueytown, Gardendale,
  Fairfield, Fultondale, Center Point, Pleasant Grove, Clay, Pinson,
  Tarrant, Midfield, Adamsville, Argo, Warrior, Brighton, Kimberly
  and Lipscomb.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3378 8665 3377 8665 3377 8656 3376 8654
      3374 8654 3373 8653 3371 8653 3335 8698
      3344 8713 3384 8681 3384 8676
TIME...MOT...LOC 1513Z 219DEG 33KT 3349 8697 

HAIL...1.00IN
WIND...<50MPH
 
$$

56

2 follow-up statements

790 
WWUS54 KBMX 021529
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
929 AM CST MON JAN 2 2017

ALC073-021600-
/O.CON.KBMX.SV.W.0002.000000T0000Z-170102T1600Z/
Jefferson AL-
929 AM CST MON JAN 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CST
FOR NORTHEASTERN JEFFERSON COUNTY...

At 929 AM CST, a severe thunderstorm was located over northwestern
Birmingham, moving northeast at 35 mph.

HAZARD...Quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected. 

Locations impacted include...
Birmingham, Trussville, Gardendale, Fairfield, Fultondale, Center
Point, Pleasant Grove, Clay, Pinson, Tarrant, Midfield, Adamsville,
Argo, Kimberly, Morris, Brookside, Mulga, County Line, B.j.c.c. and
Birmingham Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3378 8665 3377 8665 3377 8656 3376 8654
      3374 8654 3373 8653 3371 8653 3344 8689
      3353 8699 3379 8676 3382 8672
TIME...MOT...LOC 1529Z 224DEG 29KT 3356 8687 

HAIL...1.00IN
WIND...<50MPH
 
$$

56

421 
WWUS54 KBMX 021543
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
943 AM CST MON JAN 2 2017

ALC073-021552-
/O.CAN.KBMX.SV.W.0002.000000T0000Z-170102T1600Z/
Jefferson AL-
943 AM CST MON JAN 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON 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.  However small hail and
heavy rain are still possible with this thunderstorm.

LAT...LON 3378 8665 3377 8665 3377 8656 3376 8654
      3374 8654 3373 8653 3371 8653 3344 8689
      3353 8699 3379 8676 3382 8672
TIME...MOT...LOC 1536Z 219DEG 33KT 3366 8677 

$$

56

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 1, 7:11 PM CST	Dense Fog Advisory	BMX	Bibb, Blount, Calhoun, Cherokee, Cleburne, Etowah and 14 more	14 hr
Jan 2, 5:05 AM CST	Flash Flood Watch	BMX	Barbour, Bullock, Chambers, Lee, Lowndes, Macon and 3 more	19 hr
Jan 2, 7:00 AM CST	Severe Thunderstorm Warning	BMX	Greene, Sumter	21 min
Jan 2, 7:22 AM CST	Special Weather Statement	BMX	Greene	53 min
Jan 2, 8:04 AM CST	Special Weather Statement	BMX	Tuscaloosa	41 min
Jan 2, 8:48 AM CST	Special Weather Statement	BMX	Tuscaloosa	42 min
Jan 2, 9:04 AM CST	Special Weather Statement	BMX	Jefferson	41 min
Jan 2, 9:48 AM CST	Areal Flood Warning	BMX	Bibb, Blount, Chilton, Greene, Hale, Jefferson and 3 more	117 min
Jan 2, 9:48 AM CST	Special Weather Statement	BMX	Bibb	42 min
Jan 2, 10:02 AM CST	Special Weather Statement	BMX	Jefferson	43 min
Jan 2, 10:35 AM CST	Special Weather Statement	BMX	Chilton, Shelby	40 min
Jan 2, 11:07 AM CST	Special Weather Statement	BMX	Coosa, St. Clair, Talladega	38 min
Jan 2, 11:45 AM CST	Areal Flood Advisory	BMX	Bibb, Chilton, Hale, Jefferson, St. Clair, Shelby and 3 more	2 hr
Jan 2, 11:48 AM CST	Special Weather Statement	BMX	Calhoun, Clay, Talladega	42 min
Jan 2, 12:11 PM CST	Special Weather Statement	BMX	Marengo	49 min
Jan 2, 12:36 PM CST	Areal Flood Advisory	BMX	Calhoun, Chambers, Clay, Cleburne, Coosa, Randolph and 3 more	114 min
Jan 2, 1:09 PM CST	Areal Flood Advisory	BMX	Autauga, Bibb, Chilton, Coosa, Dallas, Elmore and 3 more	2 hr
Jan 2, 3:51 PM CST	Tornado Warning	BMX	Pike	34 min
Jan 2, 4:11 PM CST	Tornado Warning	BMX	Bullock	48 min
Jan 2, 5:24 PM CST	Flash Flood Warning	BMX	Autauga, Lowndes, Montgomery	6 hr
Jan 2, 5:27 PM CST	Flash Flood Warning	BMX	Bullock, Pike	6 hr
Jan 2, 5:56 PM CST	Flash Flood Warning	BMX	Barbour, Russell	5 hr
Jan 2, 5:59 PM CST	Flash Flood Warning	BMX	Elmore, Macon, Montgomery, Tallapoosa	5 hr

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.