Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 166, NWS Birmingham, AL

September 19, 2017Calhoun County, Cleburne County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Sep 19, 2017, 4:57 PM CDT for Calhoun County, Cleburne County, Alabama. It was in force for 19 min. 7 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: Sep 19, 2017, 4:57 PM CDT (21:57 UTC)
Expired: Sep 19, 2017, 5:16 PM CDT
In force: 19 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Calhoun County, AL, Cleburne County, AL

The radar

The Atlanta radar (KFFC), 103 km from the middle of the area, began a volume at 22:01 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
Sep 19, 4:57 PM CDT	TSTM WND DMG	2 S Choccolocco, AL	TREE DOWNED ALONG HIGHWAY 78. TIME ESTIMATED.
Sep 19, 4:57 PM CDT	TSTM WND DMG	2 Sse Choccolocco, AL	TREE DOWNED AT RIDDLE FARM ROAD AND OLD DOWNING MILL ROAD. TIME ESTIMATED.
Sep 19, 4:57 PM CDT	TSTM WND DMG	2 Sse Choccolocco, AL	A FEW LARGE BRANCHES DOWNED ALONG RIDDLE FARM ROAD. TIME APPROXIMATED.
Sep 19, 4:57 PM CDT	HAIL 1	1 Nne Choccolocco, AL	TRAINED SPOTTER SHARED VIDEO FROM CHOCCOLOCCO COMMUNITY CHURCH OF QUARTER SIZED HAIL ACCUMULATING.
Sep 19, 4:59 PM CDT	TSTM WND DMG	1 Se Choccolocco, AL	TREE DOWNED ON DOWNING MILL ROAD.
Sep 19, 5:00 PM CDT	TSTM WND DMG	2 E Choccolocco, AL	TREE DOWNED ALONG HIGHWAY 9. TIME ESTIMATED.
Sep 19, 5:00 PM CDT	TSTM WND DMG	2 Ese Choccolocco, AL	TREES FELL ONTO A MOBILE HOME CAUSING VISIBLE ROOF DAMAGE. TIME AND LOCATION APPROXIMATE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.0 hours before the alert went out and 109 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: 1479 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

823 
WUUS54 KBMX 192157
SVRBMX
ALC015-029-192230-
/O.NEW.KBMX.SV.W.0166.170919T2157Z-170919T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Birmingham AL
457 PM CDT TUE SEP 19 2017

The National Weather Service in Birmingham has issued a

* Severe Thunderstorm Warning for...
  Southeastern Calhoun County in east central Alabama...
  Southeastern Cleburne County in east central Alabama...

* Until 530 PM CDT

* At 457 PM CDT, a severe thunderstorm was located near Heflin,
  moving east at 20 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Heflin, Lake Cleburne, Dearmanville and Choccolocco. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3363 8577 3374 8571 3367 8540 3350 8550
TIME...MOT...LOC 2157Z 286DEG 17KT 3366 8569 

HAIL...0.88IN
WIND...60MPH
 
$$

25/Owen

1 follow-up statement

447 
WWUS54 KBMX 192216
SVSBMX

Severe Weather Statement
National Weather Service Birmingham AL
516 PM CDT TUE SEP 19 2017

ALC015-029-192225-
/O.CAN.KBMX.SV.W.0166.000000T0000Z-170919T2230Z/
Calhoun AL-Cleburne AL-
516 PM CDT TUE SEP 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CALHOUN AND
SOUTHEASTERN CLEBURNE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 3363 8577 3374 8571 3367 8540 3350 8550
TIME...MOT...LOC 2212Z 286DEG 17KT 3364 8559 

$$

25/Owen

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 2:16 PM CDT	Special Weather Statement	BMX	Blount	59 min
Sep 19, 2:22 PM CDT	Special Weather Statement	BMX	Winston	53 min
Sep 19, 3:00 PM CDT	Special Weather Statement	BMX	Shelby	45 min
Sep 19, 3:10 PM CDT	Special Weather Statement	BMX	St. Clair	50 min
Sep 19, 4:05 PM CDT	Special Weather Statement	BMX	Calhoun	40 min
Sep 19, 4:51 PM CDT	Special Weather Statement	BMX	Cleburne	39 min
Sep 19, 5:29 PM CDT	Areal Flood Advisory	BMX	Clay, Talladega	2 hr
Sep 19, 6:25 PM CDT	Special Weather Statement	BMX	Elmore	35 min
Sep 19, 6:32 PM CDT	Special Weather Statement	BMX	Bullock	43 min
Sep 19, 6:59 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Macon, Tallapoosa	46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.