Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 55, NWS Birmingham, AL

March 10, 2017Bibb County, Chilton County, Coosa County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 10, 2017, 3:15 AM CST for Bibb County, Chilton County, Coosa County, Alabama. It was in force for 45 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 10, 2017, 3:15 AM CST (09:15 UTC)
Expired: Mar 10, 2017, 4:00 AM CST
In force: 45 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bibb County, AL, Chilton County, AL, Coosa County, AL

The radar

The Birmingham radar (KBMX), 30 km from the middle of the area, began a volume at 09:16 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.

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 nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 9.3 hours before the alert went out and 32 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2156 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

596 
WUUS54 KBMX 100915
SVRBMX
ALC007-021-037-101000-
/O.NEW.KBMX.SV.W.0055.170310T0915Z-170310T1000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
315 AM CST FRI MAR 10 2017

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Chilton County in Alabama...
  Eastern Bibb County in Alabama...
  Western Coosa County in east central Alabama...

* Until 400 AM CST

* At 315 AM CST, severe thunderstorms were located along a line
  extending from 6 miles east of West Blocton to American Village to
  near Talladega Springs, moving south at 45 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Calera, Clanton, Jemison, Thorsby, West Blocton, Maplesville,
  Billingsley, Dollar, Gap Of The Mountain, Parnell, Marble Valley,
  Verbena, Plecher, Lawley, Mitchell Lake, Ashby, Brierfield
  Ironworks Park, Lay Lake Dam, Talladega National Forest and Chilton
  County Motor Sports Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3266 8702 3284 8702 3284 8706 3319 8712
      3316 8698 3310 8697 3305 8690 3307 8688
      3307 8661 3302 8656 3302 8652 3309 8651
      3310 8645 3275 8629 3277 8634 3275 8634
      3275 8641 3271 8642 3271 8671 3266 8672
TIME...MOT...LOC 0915Z 338DEG 40KT 3313 8701 3312 8682 3317 8647 

HAIL...<.75IN
WIND...60MPH
 
$$

32/Davis

1 follow-up statement

656 
WWUS54 KBMX 100946
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
346 AM CST FRI MAR 10 2017

ALC007-021-037-101000-
/O.CON.KBMX.SV.W.0055.000000T0000Z-170310T1000Z/
Chilton AL-Bibb AL-Coosa AL-
346 AM CST FRI MAR 10 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM CST
FOR CHILTON...SOUTHEASTERN BIBB AND WESTERN COOSA COUNTIES...

At 346 AM CST, severe thunderstorms were located along a line
extending from near Maplesville to near Clanton to near Lyle, moving
south at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Calera, Clanton, Jemison, Thorsby, Maplesville, Billingsley, Dollar,
Gap Of The Mountain, Parnell, Marble Valley, Verbena, Plecher,
Lawley, Mitchell Lake, Ashby, Brierfield Ironworks Park, Lay Lake
Dam, Talladega National Forest, Chilton County Motor Sports Park and
Higgins Ferry Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3266 8702 3284 8702 3284 8706 3303 8709
      3305 8690 3307 8688 3307 8661 3302 8656
      3302 8652 3309 8651 3310 8645 3275 8629
      3277 8634 3275 8634 3275 8641 3271 8642
      3271 8671 3266 8672
TIME...MOT...LOC 0946Z 338DEG 40KT 3282 8686 3281 8667 3286 8632 

HAIL...<.75IN
WIND...60MPH
 
$$

32/Davis

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 10, 12:04 AM CST, 3 hours 11 minutes earlier.

Area forecast discussion, Mar 10, 12:04 AM CST, 3 hours 11 minutes before

Area Forecast Discussion
National Weather Service Birmingham AL
1204 AM CST Fri Mar 10 2017

.UPDATE...
For 06Z Aviation.

&&

.DISCUSSION...

We're tracking a line of storms moving through Western Tennessee
this evening. This line will track southeastward and move through
the Central AL region through the overnight hours tonight. General
timing is expected to be after midnight for our northwestern
counties, reaching the Birmingham Metro around 2-4am.
The severe threat is expected to be confined to the northern half
of Central AL (mainly north of I-20 corridor). In this area, the
low level jet has increased the low-level shear values just enough
to support organized updrafts in the storms as the the front makes
its way through. Much of the instability remains elevated, which
will limit any tornado threat, but will support damaging winds and
hail.
South of the I-20 corridor, the shear is more unidirectional and
0-6km bulk shear does not support as organized of updrafts. The
question will be just how far south the better environment
stretches. For now, keeping the I-20 corridor as a rough
delineation, but it could extend a little south of that line. The
further south you go, elevated instability is still present, so
would expect some sub-severe thunderstorms still possible from
4am to 7am. By 7-8am, the front is expected to exit Central AL,
ending the rain/storm chances.

25/Owen

&&

.AVIATION...
06Z TAF Discussion.

All sites start off VFR, but there will be tsra and lower ceilings
moving into Central Alabama from northwest to southeast. I have
this activity moving near the northern sites by around 09z and
sticking around through around 12z. Ceilings should drop into the
neighborhood of 012 during this time. This convective activity is
well ahead of a cold front and winds will not swing around to the
north until around 17-18z.

The southern sites will see ceilings drop to MVFR around 10z.
Thunder is not as confident south, so have vcsh from 11-17z time
frame. This will have to be watched as the activity drops
southward overnight. Ceilings improve just after 18z as the front
moves by.

75

&&

.FIRE WEATHER...

A moistening will continue this afternoon into tonight with a line
of showers and storms expected to affect much of the area. A
second system will bring widespread rainfall to the area Saturday
night and Sunday morning. There are no fire weather concerns.

&&

.PRELIMINARY POINT TEMPS/POPS...
Gadsden     56  66  35  60  38 /  90  10   0  20  90
Anniston    57  69  38  63  39 /  90  20   0  20  90
Birmingham  62  68  38  61  38 /  90  20   0  30  90
Tuscaloosa  61  72  40  65  40 /  90  20   0  30  80
Calera      59  70  40  64  40 /  90  30   0  30  90
Auburn      56  73  42  66  46 /  40  40   0  10  90
Montgomery  59  77  44  70  46 /  30  40   0  20  90
Troy        60  77  44  71  50 /  30  50   0  10  90

&&

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

&&

Hazardous weather outlook, Mar 9, 7:31 PM CST, 7 hours 44 minutes before

Hazardous Weather Outlook
National Weather Service Birmingham AL
731 PM CST Thu Mar 9 2017

ALZ011>015-017>050-110445-
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-
731 PM CST Thu Mar 9 2017

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

.DAY ONE...Tonight.

There is a risk of severe thunderstorms tonight across north central
Alabama, mainly near and north of a line from Aliceville to
Alabaster to Wedowee. Isolated storms are possible through midnight.
Then coverage increases midnight through 4 am north. A few of the
strongest storms may produce damaging winds up to 60 MPH and hail up
to the size of half dollars.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

The Spring Freeze program has begun. Temperatures will be close or
just below freezing briefly both Monday and Tuesday mornings across
the far northern row of counties. Higher confidence that most of the
area will be below freezing Wednesday morning and a Freeze Watch may
be necessary the closer we get.

.SPOTTER INFORMATION STATEMENT...

Activation of storm spotters and emergency management may be
tonight.

In the hours before

Local storm report, Mar 10, 2:34 AM CST, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
234 AM CST FRI MAR 10 2017

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

1210 AM     HAIL             3 SW TESSNER            34.22N 87.84W
03/10/2017  M1.00 INCH       MARION             AL   PUBLIC

            QUARTER SIZED HAIL SOUTH OF HACKLEBURG AT
            AROUND 12:10AM. .

&&

NO

Local storm report, Mar 10, 2:37 AM CST, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
237 AM CST FRI MAR 10 2017

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

0235 AM     TSTM WND GST     1 NE BIRMINGHAM INTERNA 33.57N 86.75W
03/10/2017  M56 MPH          JEFFERSON          AL   ASOS

            WIND GUST OF 49KTS (56MPH) MEASURED AT
            BIRMINGHAM INTERNATIONAL AIRPORT.

&&

NO

Special weather statement, Mar 10, 2:40 AM CST, 35 minutes before

Special Weather Statement
National Weather Service Birmingham AL
240 AM CST FRI MAR 10 2017

ALZ027>029-100945-
Clay AL-Talladega AL-Randolph AL-
240 AM CST FRI MAR 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR TALLADEGA...RANDOLPH AND CLAY
COUNTIES UNTIL 345 AM CST...

At 240 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Muscadine to near Moody. Movement was
south at 45 mph.

Pea size hail and wind gusts up to 50 mph will be possible with these
storms.

Locations impacted include...
Oxford, Talladega, Sylacauga, Roanoke, Childersburg, Lineville,
Ashland, Wedowee, Talladega Springs, Lake Wedowee, Lincoln, Vincent,
Harpersville, Munford, Wadley, Waldo, Woodland, Alpine Bay Resort,
Talladega Superspeedway and Corinth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3310 8649 3313 8646 3318 8650 3320 8646
      3328 8643 3329 8636 3336 8634 3339 8638
      3354 8619 3359 8622 3359 8618 3368 8613
      3359 8599 3359 8580 3354 8580 3349 8586
      3347 8589 3350 8535 3311 8523
TIME...MOT...LOC 0840Z 349DEG 39KT 3378 8537 3356 8649

32/Davis

Special weather statement, Mar 10, 2:58 AM CST, 17 minutes before

Special Weather Statement
National Weather Service Birmingham AL
258 AM CST FRI MAR 10 2017

ALZ034-101000-
Bibb AL-
258 AM CST FRI MAR 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR BIBB COUNTY UNTIL 400 AM CST...

At 257 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from Helena to near Deerlick Creek Campgrounds.
Movement was south at 45 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Brent, Centreville, Woodstock, West Blocton, Lawley, Ashby,
Brierfield Ironworks Park, Low Gap, West Centreville, Mertz,
Talladega National Forest, Eoline, North Bibb, Randolph, Trio,
Marvel, Six Mile, Bibb County Airport, Green Pond and Hebron.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3301 8732 3312 8729 3313 8720 3319 8720
      3323 8715 3324 8712 3322 8712 3322 8710
      3325 8708 3325 8703 3317 8703 3316 8697
      3310 8697 3306 8693 3305 8688 3284 8688
      3283 8731 3287 8732 3288 8742 3300 8742
TIME...MOT...LOC 0857Z 004DEG 41KT 3329 8682 3331 8739

32/Davis

Special weather statement, Mar 10, 3:03 AM CST, 12 minutes before

Special Weather Statement
National Weather Service Birmingham AL
303 AM CST FRI MAR 10 2017

ALZ030-031-101000-
Greene AL-Sumter AL-
303 AM CST FRI MAR 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR GREENE AND SUMTER COUNTIES UNTIL
400 AM CST...

At 303 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles north of Jena to Paulette. Movement was
south at 60 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Demopolis, Livingston, Eutaw, York, Cuba, Forkland, Boligee, Union,
Gainesville, Epes, Emelle, Panola, West Greene, Thornhill, Boyd,
Knoxville, Coatopa, Kinterbish, Walden Quarters and The University Of
West Alabama.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3299 8834 3304 8804 3315 8784 3302 8783
      3300 8771 3276 8787 3275 8781 3271 8783
      3265 8774 3262 8781 3259 8774 3252 8782
      3254 8782 3243 8804 3238 8804 3231 8793
      3231 8842
TIME...MOT...LOC 0903Z 001DEG 52KT 3322 8787 3299 8843

32/Davis

Local storm report, Mar 10, 3:04 AM CST, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
304 AM CST FRI MAR 10 2017

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

0240 AM     TSTM WND DMG     PLEASANT GROVE          33.50N 86.97W
03/10/2017                   JEFFERSON          AL   FIRE DEPT/RESCUE

            PLEASANT GROVE FIRE DEPT REPORTING TREE DOWN
            ON 7TH AVENUE. TIME ESTIMATED BY RADAR.

&&

NO

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 9, 6:44 PM CST	Severe Thunderstorm Warning	BMX	Marion	33 min
Mar 9, 7:34 PM CST	Severe Thunderstorm Warning	BMX	Lamar, Marion	56 min
Mar 9, 8:12 PM CST	Severe Thunderstorm Warning	BMX	Marion	19 min
Mar 9, 8:33 PM CST	Special Weather Statement	BMX	Pickens	42 min
Mar 9, 11:38 PM CST	Special Weather Statement	BMX	Marion	37 min
Mar 9, 11:49 PM CST	Severe Thunderstorm Warning	BMX	Marion	41 min
Mar 10, 12:07 AM CST	Severe Thunderstorm Warning	BMX	Marion	31 min
Mar 10, 12:18 AM CST	Severe Thunderstorm Warning	BMX	Winston	57 min
Mar 10, 1:12 AM CST	Special Weather Statement	BMX	Blount	63 min
Mar 10, 1:14 AM CST	Special Weather Statement	BMX	Cherokee	61 min
Mar 10, 1:16 AM CST	Special Weather Statement	BMX	Marion, Winston	59 min
Mar 10, 1:21 AM CST	Special Weather Statement	BMX	Etowah	54 min
Mar 10, 1:44 AM CST	Special Weather Statement	BMX	Fayette, Lamar, Walker	76 min
Mar 10, 1:53 AM CST	Special Weather Statement	BMX	Calhoun, Cleburne, St. Clair	82 min
Mar 10, 1:59 AM CST	Special Weather Statement	BMX	Jefferson	76 min
Mar 10, 2:26 AM CST	Special Weather Statement	BMX	Pickens, Tuscaloosa	64 min
Mar 10, 2:36 AM CST	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby	54 min
Mar 10, 2:40 AM CST	Special Weather Statement	BMX	Clay, Randolph, Talladega	65 min
Mar 10, 2:58 AM CST	Special Weather Statement	BMX	Bibb	62 min
Mar 10, 3:03 AM CST	Special Weather Statement	BMX	Greene, Sumter	57 min
Mar 10, 3:24 AM CST	Severe Thunderstorm Warning	BMX	Clay, Coosa, Tallapoosa	51 min
Mar 10, 3:41 AM CST	Special Weather Statement	BMX	Chambers	64 min
Mar 10, 3:51 AM CST	Special Weather Statement	BMX	Autauga, Dallas, Elmore	54 min
Mar 10, 4:02 AM CST	Severe Thunderstorm Warning	BMX	Autauga, Elmore	28 min
Mar 10, 4:05 AM CST	Special Weather Statement	BMX	Lee	40 min
Mar 10, 4:15 AM CST	Severe Thunderstorm Warning	BMX	Macon, Montgomery	45 min
Mar 10, 4:21 AM CST	Special Weather Statement	BMX	Lowndes	39 min
Mar 10, 4:34 AM CST	Special Weather Statement	BMX	Bullock, Russell	41 min
Mar 10, 4:57 AM CST	Special Weather Statement	BMX	Barbour, Pike	48 min
Mar 10, 3:56 PM CST	Frost Advisory	BMX	Blount, Calhoun, Cherokee, Clay, Cleburne, Etowah and 9 more	15 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.