Alert archive / Alabama / Special Weather Statements in 2020

Special Weather Statement, NWS Huntsville, AL

February 18, 20204 counties in Alabama

NWS Huntsville, AL issued this special weather statement at Feb 18, 2020, 11:21 AM CST for 4 counties in Alabama. It was in force for 84 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: Feb 18, 2020, 11:21 AM CST (17:21 UTC)
Expired: Feb 18, 2020, 12:45 PM CST
In force: 84 min
Issued by: NWS Huntsville, AL

Counties Cullman County, AL, Franklin County, AL, Lawrence County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 92 km from the middle of the area, began a volume at 17:25 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, 5.4 hours before the alert went out and 133 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: 1 J/kg
Mixed-layer CIN: -325 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 336 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 6:53 AM CST	Special Weather Statement	HUN	Colbert	52 min
Feb 18, 8:19 AM CST	Special Weather Statement	HUN	Jackson	41 min
Feb 18, 11:01 AM CST	Flash Flood Watch	HUN	Cullman, DeKalb, Franklin, Lawrence, Marshall, Morgan	9 hr
Feb 18, 1:48 AM CST	Special Weather Statement	HUN	Lincoln, Moore	42 min

Nearby

Special Weather Statements in Alabama, 2020 Every special weather statement 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.