Alert archive / Alabama / Tornado Warnings in 2017

Tornado Warning 55, NWS Birmingham, AL

October 7, 2017Autauga County, Lowndes County, Alabama

NWS Birmingham, AL issued this tornado warning at Oct 7, 2017, 7:23 PM CDT for Autauga County, Lowndes County, Alabama. It was in force for 37 min. 4 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: Oct 7, 2017, 7:23 PM CDT (00:23 UTC)
Expired: Oct 7, 2017, 8:00 PM CDT
In force: 37 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Autauga County, AL, Lowndes County, AL

The radar

The Maxwell AFB radar (KMXX), 80 km from the middle of the area, began a volume at 00:27 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, 7:31 PM CDT	TSTM WND DMG	2 Ssw Autaugaville, AL	TREES AND POWER LINES DOWN BLOCKING PORTIONS OF CR 17 AND RIVERVIEW RD. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Oct 7, 7:31 PM CDT	TORNADO	2 S Autaugaville, AL	BEGAN JUST NORTH OF THE ALABAMA RIVER IN PRIVATE FARMLAND AND MOVED NORTHWEST ACROSS CR-19 WHERE IT UPROOTED TREES AND SNAPPED A FEW TREE TRUNKS. THE TORNADO CONTINUED NORTHWEST CROSSING CR-17 NEAR THE INTERSECTION OF CR-74 WHERE SEVERAL TREES WERE UPROOTED. T
Oct 7, 7:31 PM CDT	TORNADO	2 S Autaugaville, AL	BEGAN JUST NORTH OF THE ALABAMA RIVER IN PRIVATE FARMLAND AND MOVED NORTHWEST ACROSS CR-19 WHERE IT UPROOTED TREES AND SNAPPED A FEW TREE TRUNKS. THE TORNADO CONTINUED NORTHWEST CROSSING CR-17 NEAR THE INTERSECTION OF CR-74 WHERE SEVERAL TREES WERE UPROOTED. T
Oct 7, 7:36 PM CDT	TSTM WND DMG	2 Wnw Autaugaville, AL	TREES AND POWER LINES DOWN ALONG HWY 14 WEST OF AUTAUGAVILLE. NOT KNOWN IF THERE IS ANY STRUCTURAL DAMAGE AT THIS TIME. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.

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, 0.4 hours before the alert went out and 85 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.

043 
WFUS54 KBMX 080023
TORBMX
ALC001-085-080100-
/O.NEW.KBMX.TO.W.0055.171008T0023Z-171008T0100Z/

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

The National Weather Service in Birmingham has issued a

* Tornado Warning for...
  Central Autauga County in central Alabama...
  North central Lowndes County in south central Alabama...

* Until 800 PM CDT
    
* At 722 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Lowndesboro, or 11 miles north of Hayneville,
  moving north at 35 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...
  Autaugaville, White Hall, Mulberry and Vida Junction. 

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 3234 8652 3231 8669 3255 8684 3260 8662
TIME...MOT...LOC 0022Z 159DEG 29KT 3235 8663 

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

$$

75

1 follow-up statement

632 
WWUS54 KBMX 080039
SVSBMX

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

ALC085-080049-
/O.CAN.KBMX.TO.W.0055.000000T0000Z-171008T0100Z/
Lowndes AL-
739 PM CDT SAT OCT 7 2017

...THE TORNADO WARNING FOR NORTH CENTRAL LOWNDES 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 3237 8672 3240 8672 3240 8673 3239 8674
      3255 8684 3259 8666 3238 8660 3238 8662
      3240 8661 3241 8662 3240 8664 3240 8665
      3238 8665 3237 8666 3236 8671
TIME...MOT...LOC 0039Z 173DEG 30KT 3246 8667 

$$

ALC001-080100-
/O.CON.KBMX.TO.W.0055.000000T0000Z-171008T0100Z/
Autauga AL-
739 PM CDT SAT OCT 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR CENTRAL
AUTAUGA COUNTY...
    
At 739 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Autaugaville, or 13 miles west of Prattville, moving
north at 35 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...
Autaugaville, Mulberry and Vida Junction. 

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 3237 8672 3240 8672 3240 8673 3239 8674
      3255 8684 3259 8666 3238 8660 3238 8662
      3240 8661 3241 8662 3240 8664 3240 8665
      3238 8665 3237 8666 3236 8671
TIME...MOT...LOC 0039Z 173DEG 30KT 3246 8667 

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, 8:01 PM CDT	Tornado Warning	BMX	Autauga, Chilton	29 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.