Alert archive / Alabama / Tornado Warnings in 2017

Tornado Warning 56, NWS Birmingham, AL

October 7, 2017Autauga County, Chilton County, Alabama

NWS Birmingham, AL issued this tornado warning at Oct 7, 2017, 8:01 PM CDT for Autauga County, Chilton County, Alabama. It was in force for 29 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: Oct 7, 2017, 8:01 PM CDT (01:01 UTC)
Expired: Oct 7, 2017, 8:30 PM CDT
In force: 29 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Autauga County, AL, Chilton County, AL

The radar

The Birmingham radar (KBMX), 60 km from the middle of the area, began a volume at 01:04 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
Oct 7, 8:20 PM CDT	TORNADO	3 Nne Plecher, AL	DAMAGE WAS SPORADIC ALONG ITS SHORT PATH, AND PRIMARILY CONSISTED OF TWIGS AND BRANCHES OF VARIOUS SIZE THAT WERE BROKEN OFF OF TREES.

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 00:00Z, 1.0 hours before the alert went out and 61 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: 599 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 707 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

As transmitted.

237 
WFUS54 KBMX 080101
TORBMX
ALC001-021-080130-
/O.NEW.KBMX.TO.W.0056.171008T0101Z-171008T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Birmingham AL
801 PM CDT SAT OCT 7 2017

The National Weather Service in Birmingham has issued a

* Tornado Warning for...
  Northwestern Autauga County in central Alabama...
  Southwestern Chilton County in central Alabama...

* Until 830 PM CDT
    
* At 800 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Vida Junction, or 15 miles east of Valley Grande,
  moving north at 25 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations impacted include...
  Maplesville, Billingsley, Plecher, Vida Junction, Pooles
  Crossroads, Stanton and Dawson Mill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3254 8659 3249 8681 3279 8692 3283 8668
TIME...MOT...LOC 0100Z 165DEG 24KT 3260 8672 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

75

1 follow-up statement

235 
WWUS54 KBMX 080121
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
821 PM CDT SAT OCT 7 2017

ALC001-080130-
/O.CAN.KBMX.TO.W.0056.000000T0000Z-171008T0130Z/
Autauga AL-
821 PM CDT SAT OCT 7 2017

...THE TORNADO WARNING FOR NORTHWESTERN AUTAUGA COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 3277 8691 3279 8692 3283 8668 3282 8668
      3274 8665 3271 8665 3271 8671 3266 8672
      3266 8686
TIME...MOT...LOC 0120Z 168DEG 28KT 3274 8677 

$$

ALC021-080130-
/O.CON.KBMX.TO.W.0056.000000T0000Z-171008T0130Z/
Chilton AL-
821 PM CDT SAT OCT 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR
SOUTHWESTERN CHILTON COUNTY...
    
At 820 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Plecher, or 10 miles southwest of Clanton, moving
north at 30 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Maplesville, Billingsley, Plecher and Pooles Crossroads. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3277 8691 3279 8692 3283 8668 3282 8668
      3274 8665 3271 8665 3271 8671 3266 8672
      3266 8686
TIME...MOT...LOC 0120Z 168DEG 28KT 3274 8677 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

75

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 7:23 PM CDT	Tornado Warning	BMX	Autauga, Lowndes	37 min
Oct 7, 8:36 PM CDT	Tornado Warning	BMX	Bibb, Chilton	24 min
Oct 7, 8:57 PM CDT	Tornado Warning	BMX	Bibb, Chilton, Shelby	33 min
Oct 7, 9:59 PM CDT	Areal Flood Advisory	BMX	Bibb, Shelby	3 hr
Oct 8, 4:47 AM CDT	Areal Flood Advisory	BMX	Autauga, Dallas, Lowndes	6 hr
Oct 8, 6:42 AM CDT	Areal Flood Advisory	BMX	Autauga, Chilton, Coosa, Elmore, Montgomery	3 hr
Oct 8, 8:38 AM CDT	Areal Flood Advisory	BMX	Barbour, Bullock, Chambers, Elmore, Lee, Macon and 3 more	3 hr

Nearby

Tornado Warnings in Alabama, 2017 Every tornado warning in 2017 Tornadoes 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.