Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 169, NWS Birmingham, AL

July 15, 2020Chambers County, Lee County, Tallapoosa County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jul 15, 2020, 4:44 PM CDT for Chambers County, Lee County, Tallapoosa County, Alabama. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 15, 2020, 4:44 PM CDT (21:44 UTC)
Expired: Jul 15, 2020, 5:12 PM CDT
In force: 28 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Chambers County, AL, Lee County, AL, Tallapoosa County, AL

The radar

The Maxwell AFB radar (KMXX), 38 km from the middle of the area, began a volume at 21:47 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.7 hours before the alert went out and 114 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: 392 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 15, 3:51 PM CDT, 53 minutes earlier.

Area forecast discussion, Jul 15, 3:51 PM CDT, 53 minutes before

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Hazardous weather outlook, Jul 15, 3:22 PM CDT, 1 hour 22 minutes before

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In the hours before

Local storm report, Jul 15, 3:58 PM CDT, 46 minutes before

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Special weather statement, Jul 15, 4:01 PM CDT, 43 minutes before

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Special weather statement, Jul 15, 4:11 PM CDT, 33 minutes before

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Special weather statement, Jul 15, 4:17 PM CDT, 27 minutes before

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Special weather statement, Jul 15, 4:19 PM CDT, 25 minutes before

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Special weather statement, Jul 15, 4:42 PM CDT, 2 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 15, 1:37 PM CDT	Heat Advisory	BMX	Bibb, Dallas, Fayette, Greene, Hale, Lamar and 8 more	53 hr
Jul 15, 2:09 PM CDT	Special Weather Statement	BMX	Pike	36 min
Jul 15, 2:36 PM CDT	Special Weather Statement	BMX	Bullock, Lowndes, Montgomery	39 min
Jul 15, 2:53 PM CDT	Severe Thunderstorm Warning	BMX	Barbour, Bullock	15 min
Jul 15, 3:29 PM CDT	Special Weather Statement	BMX	Lee	46 min
Jul 15, 3:32 PM CDT	Severe Thunderstorm Warning	BMX	Lee, Russell	28 min
Jul 15, 3:35 PM CDT	Special Weather Statement	BMX	Macon	40 min
Jul 15, 3:42 PM CDT	Special Weather Statement	BMX	Elmore	33 min
Jul 15, 4:01 PM CDT	Special Weather Statement	BMX	Montgomery	29 min
Jul 15, 4:09 PM CDT	Areal Flood Advisory	BMX	Elmore, Montgomery	2 hr
Jul 15, 4:11 PM CDT	Special Weather Statement	BMX	Russell	34 min
Jul 15, 4:17 PM CDT	Special Weather Statement	BMX	Elmore	28 min
Jul 15, 4:19 PM CDT	Special Weather Statement	BMX	Lee	26 min
Jul 15, 4:42 PM CDT	Special Weather Statement	BMX	Lee	33 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020 Every severe thunderstorm warning in 2020

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.