Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 34, NWS Birmingham, AL

March 1, 2017Bibb County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 1, 2017, 3:44 PM CST for Bibb County, Alabama. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 1, 2017, 3:44 PM CST (21:44 UTC)
Expired: Mar 1, 2017, 4:30 PM CST
In force: 46 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Bibb County, AL

The radar

The Birmingham radar (KBMX), 43 km from the middle of the area, began a volume at 21:47 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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
Mar 1, 3:43 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.7 hours before the alert went out and 43 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.

426 
WUUS54 KBMX 012144
SVRBMX
ALC007-012230-
/O.NEW.KBMX.SV.W.0034.170301T2144Z-170301T2230Z/

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

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Bibb County in Alabama...

* Until 430 PM CST

* At 343 PM CST, a severe thunderstorm was located near Mertz, or 15
  miles west of Brent, moving east at 50 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Brent, Centreville, Lawley, Ashby, Brierfield Ironworks Park, Low
  Gap, West Centreville, Mertz, Talladega National Forest, Eoline,
  Randolph, Trio, Six Mile and Bibb County Airport.

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 west central
Alabama.

LAT...LON 3301 8732 3302 8729 3307 8693 3306 8690
      3305 8690 3305 8688 3285 8688 3286 8718
      3287 8732 3287 8741 3288 8742 3300 8742
TIME...MOT...LOC 2143Z 264DEG 43KT 3292 8744 

HAIL...1.25IN
WIND...60MPH
 
$$

87/GRANTHAM

2 follow-up statements

972 
WWUS54 KBMX 012206
SVSBMX

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

ALC007-012230-
/O.CON.KBMX.SV.W.0034.000000T0000Z-170301T2230Z/
Bibb AL-
406 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CST
FOR SOUTHEASTERN BIBB COUNTY...

At 406 PM CST, a severe thunderstorm was located over Brent, moving
east at 45 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Brent, Centreville, Lawley, Talladega National Forest, Eoline, Ashby,
Brierfield Ironworks Park, West Centreville, Randolph, Trio, Six Mile
and Bibb County Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3286 8724 3301 8726 3307 8693 3306 8690
      3305 8690 3305 8688 3285 8688 3286 8718
TIME...MOT...LOC 2206Z 264DEG 39KT 3294 8716 

HAIL...1.25IN
WIND...60MPH
 
$$

87/GRANTHAM

766 
WWUS54 KBMX 012219
SVSBMX

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

ALC007-012230-
/O.CON.KBMX.SV.W.0034.000000T0000Z-170301T2230Z/
Bibb AL-
419 PM CST WED MAR 1 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CST
FOR SOUTHEASTERN BIBB COUNTY...

At 419 PM CST, a severe thunderstorm was located near Ashby, or 9
miles east of Centreville, moving east at 50 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Centreville, Lawley, Talladega National Forest, Ashby, Brierfield
Ironworks Park, Randolph, Trio, Six Mile and Bibb County Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3286 8714 3303 8714 3307 8693 3306 8690
      3305 8690 3305 8688 3285 8688
TIME...MOT...LOC 2219Z 264DEG 43KT 3296 8697 

HAIL...1.25IN
WIND...60MPH
 
$$

87/GRANTHAM

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 Mar 1, 3:07 PM CST, 37 minutes earlier.

Area forecast discussion, Mar 1, 3:07 PM CST, 37 minutes before

Area Forecast Discussion
National Weather Service Birmingham AL
307 PM CST Wed Mar 1 2017

.SHORT TERM...
Tonight.

A narrow band of thunderstorms across northwest Alabama will
continue to track southeast this afternoon and evening. The
primary threat with these storms has been large hail, due to
decent mid level lapse rates and mid level rotation within some of
the stronger storms. With surface temperatures in the upper 70s
to lower 80s and surface dewpoints in the 60s, the air mass is
moderately unstable with CAPE values near 1000 j/kg. Despite
strong low level shear, directional shear is not favorable for
tornadic storms, and tornado threat is very low at this time. Even
though the cold front is not far behind the line of convection,
temperatures do not drop very much behind the front. The air mass
does dry out quickly with surface dewpoints already in the 40s
across northeast Mississippi. The line of convection will be just
north of the I-85 corridor by 6 pm and likely out of our southeast
counties by 9 pm. Clearing and much cooler overnight with lows in
the 40s.

58/rose

.LONG TERM...
Thursday through Tuesday.

A large dome of high pressure will build across Central Conus on
Thursday behind the front with decent cold air advection/northerly
flow around it into Alabama. This will be reinforced by northwest
flow aloft to help bring some Canadian air down into Conus
Thursday. With that said, we can expect lows in the 30s for both
Thursday and Friday nights. Some areas will likely dip below
freezing on Friday night as the large 1032-1037 mb surface ridge
slowly shifts into the eastern 1/3 of Conus.

Guidance continues to moderate our airmass starting Saturday as
the surface ridge moves to the Atlantic Seaboard by Saturday
night. Cold air advection gets cut off and the flow turns back
around to receive warmer moist air off of the gulf. Sunday looks
to be our transition day with milder temperatures and slowly
rising dew points as southerly winds return. Low rain chance
return by Sunday night in the northwest with rain chances
increasing on Monday into Tuesday as another front approaches.
I remain with only 30-40 % chance pops for this next system as
there are still some disagreements in solutions on timing. The
front may be through by early Tuesday but will leave in some low
pops for Tuesday/Tuesday evening with it being far out and only a
low confidence on timing overall. Will refine with future runs.

08

&&

.AVIATION...
18Z TAF Discussion.

A cold front will approach the area from the northwest this
afternoon and will result in windy conditions at times from the
south and southwest with increasing coverage of shower and
thunderstorm activity. Expect windy conditions to persist after
FROPA as a northwest wind develops. CIG's will gradually improve
overnight with VFR conditions expected on Thursday.

05

&&

.FIRE WEATHER...

A pre-frontal band of thunderstorms will track southeast across
Central Alabama this afternoon and evening. A few of these
thunderstorms could become strong to severe. Much cooler and drier
conditions are expected for Thursday and Friday. There are no
fire weather concerns.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     40  58  34  56  31 /  20   0   0   0   0
Anniston    42  59  35  58  32 /  50   0   0   0   0
Birmingham  42  60  36  58  34 /  20   0   0   0   0
Tuscaloosa  41  62  37  61  35 /  10   0   0   0   0
Calera      42  61  37  60  35 /  30   0   0   0   0
Auburn      46  61  37  61  36 /  80   0   0   0   0
Montgomery  49  64  39  64  36 /  80   0   0   0   0
Troy        49  63  37  64  35 /  80   0   0   0   0

&&

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

&&

Hazardous weather outlook, Mar 1, 10:41 AM CST, 5 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
1041 AM CST Wed Mar 1 2017

ALZ011>015-017>050-021945-
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-
1041 AM CST Wed Mar 1 2017

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

.DAY ONE...This Afternoon and Tonight.

Severe thunderstorms will be likely between 12 Noon and 10 PM today
as a cold front moves through the region. There is an elevated threat
of damaging winds along and north of a line from Geiger, to Thorsby,
to Wedowee, where isolated tornadoes and large hail will also be
possible. For the rest of Central Alabama, there will be a limited
threat of damaging winds and hail.

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

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management will be
likely this afternoon and evening.

In the hours before

Local storm report, Mar 1, 2:29 PM CST, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
229 PM CST WED MAR 1 2017

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

0227 PM     HAIL             1 SSE FAYETTE           33.69N 87.83W
03/01/2017  U1.00 INCH       FAYETTE            AL   LAW ENFORCEMENT

            QUARTER-SIZED HAIL REPORTED.

&&

GMS

Local storm report, Mar 1, 2:42 PM CST, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
242 PM CST WED MAR 1 2017

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

0201 PM     HAIL             2 ENE WINFIELD          33.94N 87.78W
03/01/2017  U1.00 INCH       MARION             AL   AMATEUR RADIO

            NICKEL-SIZED HAIL WITH A FEW QUARTERS MIXED
            IN.

&&

GMS

Local storm report, Mar 1, 2:45 PM CST, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
245 PM CST WED MAR 1 2017

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

0224 PM     HAIL             FAYETTE                 33.69N 87.83W
03/01/2017  U1.00 INCH       FAYETTE            AL   PUBLIC

            PENNY- TO QUARTER-SIZED HAIL REPORTED.

&&

GMS

Special weather statement, Mar 1, 3:22 PM CST, 22 minutes before

Special Weather Statement
National Weather Service Birmingham AL
322 PM CST WED MAR 1 2017

ALZ024-012215-
Jefferson AL-
322 PM CST WED MAR 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN JEFFERSON COUNTY UNTIL
415 PM CST...

At 322 PM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Arkadelphia to Gorgas Steam Plant.
Movement was east at 50 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Northern Birmingham, Trussville, Gardendale, Fultondale, Sumiton,
Center Point, Clay, Pinson, Adamsville, Warrior, Kimberly,
Graysville, Morris, Brookside, Trafford, West Jefferson, County Line,
Cardiff, Chalkville and Grayson Valley.

LAT...LON 3384 8676 3377 8665 3377 8654 3374 8654
      3372 8653 3364 8654 3361 8718 3362 8715
      3363 8714 3363 8710 3366 8709 3366 8706
      3368 8706 3369 8704 3377 8702 3377 8701
      3379 8700 3379 8697 3382 8695 3384 8688
TIME...MOT...LOC 2122Z 269DEG 42KT 3384 8697 3364 8719

87/GRANTHAM

Local storm report, Mar 1, 3:22 PM CST, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
322 PM CST WED MAR 1 2017

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

0319 PM     HAIL             CORDOVA                 33.75N 87.19W
03/01/2017  U0.88 INCH       WALKER             AL   AMATEUR RADIO

            NICKEL-SIZED HAIL IN THE CORDOVA/PARRISH
            AREA.

&&

GMS

Local storm report, Mar 1, 3:29 PM CST, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
329 PM CST WED MAR 1 2017

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

0321 PM     HAIL             1 WSW CORDOVA           33.75N 87.20W
03/01/2017  U1.00 INCH       WALKER             AL   BROADCAST MEDIA

            A LOT OF QUARTER-SIZED HAIL FALLING ALONG
            I-22 IN CORDOVA. .

&&

GMS

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, 3:48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.