Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

August 15, 2021Cullman County, Alabama

NWS Huntsville, AL issued this special weather statement at Aug 15, 2021, 4:05 PM CDT for Cullman County, Alabama. It was in force for 40 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: Aug 15, 2021, 4:05 PM CDT (21:05 UTC)
Expired: Aug 15, 2021, 4:45 PM CDT
In force: 40 min
Issued by: NWS Huntsville, AL
Hail: 0.25 in
Wind: 30

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 86 km from the middle of the area, began a volume at 21:05 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, 9.1 hours before the alert went out and 85 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: 340 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: -13 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 Huntsville, AL wrote its last area forecast discussion before this special weather statement went out at Aug 15, 3:55 PM CDT, 10 minutes earlier.

Area forecast discussion, Aug 15, 3:55 PM CDT, 10 minutes before

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Hazardous weather outlook, Aug 15, 3:12 AM CDT, 12 hours 53 minutes before

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In the hours before

Special weather statement, Aug 15, 4:05 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Huntsville AL
405 PM CDT Sun Aug 15 2021

ALZ016-152145-
Cullman AL-
405 PM CDT Sun Aug 15 2021

...A strong thunderstorm will impact portions of southwestern Cullman
County through 445 PM CDT...

At 404 PM CDT, Doppler radar was tracking a strong thunderstorm near
Arkadelphia, or near Sumiton, moving north at 15 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Hanceville, Good Hope, Dodge City, Colony, Wilburn, Logan, Bremen,
Arkadelphia, Black Bottom and Smith Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3389 8701 3390 8710 3391 8708 3393 8710
      3415 8704 3407 8674 3395 8680 3395 8685
      3393 8686 3394 8688 3392 8689 3391 8692
      3387 8692 3386 8696 3386 8699
TIME...MOT...LOC 2104Z 198DEG 15KT 3384 8700

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

MA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 1:59 PM CDT	Areal Flood Warning	HUN	Colbert, Lauderdale	3 hr
Aug 15, 3:22 PM CDT	Areal Flood Warning	HUN	Lauderdale	3 hr
Aug 15, 5:56 PM CDT	Areal Flood Warning	HUN	Cullman, Limestone, Madison, Morgan	3 hr
Aug 15, 6:25 PM CDT	Areal Flood Warning	HUN	Jackson, Madison	3 hr
Aug 15, 5:54 PM CDT	Areal Flood Warning	HUN	Franklin, Lincoln, Moore	3 hr

Nearby

Special Weather Statements in Alabama, 2021 Every special weather statement in 2021

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.