Alert archive / Alabama / Tornado Warnings in 2017

Tornado Warning 20, NWS Birmingham, AL

April 5, 2017Chambers County, Alabama

NWS Birmingham, AL issued this tornado warning at Apr 5, 2017, 8:57 PM CDT for Chambers County, Alabama. It was in force for 18 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: Apr 5, 2017, 8:57 PM CDT (01:57 UTC)
Expired: Apr 5, 2017, 9:15 PM CDT
In force: 18 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Chambers County, AL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 5, 1:50 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 2.0 hours before the alert went out and 82 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: 723 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 93 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 9.8

Open this sounding in Storm Lab

The text

As transmitted.

769 
WFUS54 KBMX 060157
TORBMX
ALC017-060215-
/O.NEW.KBMX.TO.W.0020.170406T0157Z-170406T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Birmingham AL
857 PM CDT WED APR 5 2017

The National Weather Service in Birmingham has issued a

* Tornado Warning for...
  Northeastern Chambers County in east central Alabama...

* Until 915 PM CDT
    
* At 857 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Stroud, moving northeast at 45 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...
  Stroud, Standing Rock, Welch and Post Oak Forks. 

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 3303 8534 3310 8536 3311 8534 3311 8523
      3305 8522
TIME...MOT...LOC 0157Z 244DEG 41KT 3305 8533 

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

$$

89^GSatterwhite

1 follow-up statement

781 
WWUS54 KBMX 060209
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
909 PM CDT WED APR 5 2017

ALC017-060219-
/O.EXP.KBMX.TO.W.0020.000000T0000Z-170406T0215Z/
Chambers AL-
909 PM CDT WED APR 5 2017

...THE TORNADO WARNING FOR NORTHEASTERN CHAMBERS COUNTY WILL EXPIRE
AT 915 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 1000 PM CDT for east central
Alabama. A tornado watch also remains in effect until 100 AM CDT for
east central Alabama.

LAT...LON 3303 8534 3310 8536 3311 8534 3311 8523
      3305 8522
TIME...MOT...LOC 0209Z 244DEG 41KT 3310 8520 

$$

89^GSatterwhite

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 7:04 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne	26 min
Apr 5, 7:15 PM CDT	Tornado Warning	BMX	Cleburne	15 min
Apr 5, 7:36 PM CDT	Severe Thunderstorm Warning	BMX	Coosa, Elmore	27 min
Apr 5, 8:29 PM CDT	Tornado Warning	BMX	Tallapoosa	9 min
Apr 5, 8:35 PM CDT	Tornado Warning	BMX	Chambers	25 min
Apr 5, 8:47 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Macon, Montgomery, Tallapoosa	43 min
Apr 5, 9:05 PM CDT	River Flood Warning	BMX	Chambers, Elmore, Macon, Randolph, Tallapoosa	29 hr
Apr 5, 9:38 PM CDT	Severe Thunderstorm Warning	BMX	Lee	37 min
Apr 6, 4:45 AM CDT	River Flood Warning	BMX	Sumter	60 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; the sounding from the Mesonet's radiosonde archive.