Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Birmingham, AL

April 22, 2017Walker County, Alabama

NWS Birmingham, AL issued this special weather statement at Apr 22, 2017, 4:51 PM CDT for Walker County, Alabama. It was in force for 39 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 22, 2017, 4:51 PM CDT (21:51 UTC)
Expired: Apr 22, 2017, 5:30 PM CDT
In force: 39 min
Issued by: NWS Birmingham, AL

County Walker County, AL

The radar

The Birmingham radar (KBMX), 95 km from the middle of the area, began a volume at 21:53 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.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.9 hours before the alert went out and 94 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: 1098 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 22, 4:34 PM CDT, 17 minutes earlier.

Area forecast discussion, Apr 22, 4:34 PM CDT, 17 minutes before

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Hazardous weather outlook, Apr 22, 8:28 AM CDT, 8 hours 23 minutes before

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In the hours before

Special weather statement, Apr 22, 4:39 PM CDT, 12 minutes before

Special Weather Statement
National Weather Service Birmingham AL
439 PM CDT SAT APR 22 2017

ALZ014-222230-
Winston AL-
439 PM CDT SAT APR 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WINSTON COUNTY UNTIL 530
PM CDT...

At 439 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ashridge, or 11 miles east of Haleyville, moving east at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Addison, Brushy Lake, Sardis, Moreland, Nesmith, Inmanfield,
Ashridge, Addison Town Hall, Upshaw, Sipsey River Rec Area, Grayson
and Addison Municipal Airport.

LAT...LON 3430 8711 3413 8711 3421 8755 3430 8754
TIME...MOT...LOC 2139Z 273DEG 29KT 3427 8741

08

Special weather statement, Apr 22, 4:51 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Birmingham AL
451 PM CDT SAT APR 22 2017

ALZ015-222230-
Walker AL-
451 PM CDT SAT APR 22 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WALKER COUNTY UNTIL 530
PM CDT...

At 451 PM CDT, Doppler radar was tracking a strong thunderstorm over
Carbon Hill, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Jasper, Carbon Hill, Sipsey, Kansas, Nauvoo, Curry, Smith Dam, Lynns
Park, Cedrum Area, Holly Grove, Powellville, Manchester, Lupton,
Gamble, Townley, Boldo and Walker County Airport.

LAT...LON 3399 8714 3396 8713 3396 8711 3394 8710
      3392 8708 3390 8710 3389 8706 3379 8706
      3378 8753 3387 8753 3387 8758 3397 8759
      3400 8742 3399 8722 3398 8720 3400 8719
      3400 8717
TIME...MOT...LOC 2151Z 262DEG 23KT 3388 8750

08

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 4:39 PM CDT	Special Weather Statement	BMX	Winston	51 min
Apr 22, 5:44 PM CDT	Special Weather Statement	BMX	Marengo, Sumter	46 min
Apr 22, 6:09 PM CDT	Special Weather Statement	BMX	Jefferson	51 min
Apr 22, 6:21 PM CDT	Special Weather Statement	BMX	Blount	39 min
Apr 22, 6:59 PM CDT	Special Weather Statement	BMX	Blount	31 min

Nearby

Special Weather Statements in Alabama, 2017 Every special weather statement 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.