Alert archive / Alabama / Special Weather Statements in 2011

Special Weather Statement, NWS Birmingham, AL

July 12, 2011Jefferson County, Alabama

NWS Birmingham, AL issued this special weather statement at Jul 12, 2011, 6:49 PM CDT for Jefferson County, Alabama. It was in force for 41 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: Jul 12, 2011, 6:49 PM CDT (23:49 UTC)
Expired: Jul 12, 2011, 7:30 PM CDT
In force: 41 min
Issued by: NWS Birmingham, AL

County Jefferson County, AL

The radar

The Birmingham radar (KBMX), 32 km from the middle of the area, began a volume at 23:53 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, 11.8 hours before the alert went out and 31 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: 2263 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 767 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Jul 12, 6:38 PM CDT, 11 minutes earlier.

Area forecast discussion, Jul 12, 6:38 PM CDT, 11 minutes before

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Hazardous weather outlook, Jul 12, 11:45 AM CDT, 7 hours 4 minutes before

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In the hours before

Special weather statement, Jul 12, 3:35 PM CDT, 3 hours 14 minutes before

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Special weather statement, Jul 12, 6:24 PM CDT, 25 minutes before

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Special weather statement, Jul 12, 6:36 PM CDT, 13 minutes before

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Special weather statement, Jul 12, 6:49 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 11:03 AM CDT	Special Weather Statement	BMX	Cleburne	42 min
Jul 12, 11:41 AM CDT	Special Weather Statement	BMX	Randolph	49 min
Jul 12, 3:35 PM CDT	Special Weather Statement	BMX	Coosa	25 min
Jul 12, 6:24 PM CDT	Special Weather Statement	BMX	Bibb	51 min
Jul 12, 6:36 PM CDT	Special Weather Statement	BMX	Sumter	39 min

Nearby

Special Weather Statements in Alabama, 2011 Every special weather statement in 2011

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.