Alert archive / Alabama / Areal Flood Warnings in 2021

Areal Flood Warning 39, NWS Huntsville, AL

August 19, 2021Cullman County, Alabama

NWS Huntsville, AL issued this areal flood warning at Aug 19, 2021, 1:06 PM CDT for Cullman 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 counties it named.

The facts

Issued: Aug 19, 2021, 1:06 PM CDT (18:06 UTC)
Expired: Aug 19, 2021, 1:45 PM CDT
In force: 39 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 107 km from the middle of the area, began a volume at 18:08 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, 6.1 hours before the alert went out and 106 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: 2206 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 54 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 areal flood warning 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 areal flood warning went out at Aug 19, 11:40 AM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Aug 19, 11:40 AM CDT, 1 hour 26 minutes before

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Hazardous weather outlook, Aug 19, 3:41 AM CDT, 9 hours 25 minutes before

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In the hours before

Local storm report, Aug 19, 9:34 AM CDT, 3 hours 32 minutes before

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Local storm report, Aug 19, 10:20 AM CDT, 2 hours 46 minutes before

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Special weather statement, Aug 19, 10:32 AM CDT, 2 hours 34 minutes before

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Special weather statement, Aug 19, 11:05 AM CDT, 2 hours 1 minute before

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Local storm report, Aug 19, 11:23 AM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1123 AM CDT THU AUG 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     TSTM WND DMG     4 NNE MADISON           34.75N 86.72W
08/18/2021                   MADISON            AL   BROADCAST MEDIA

            CORRECTS PREVIOUS NON-TSTM WND DMG REPORT
            FROM 4 NNE MADISON. TREE FELL ON HOME ON
            YANCY RD IN MADISON, FROM OUTFLOW BOUNDARY
            SE OF THUNDERSTORM COMPLEX. TIME ESTIMATED
            FROM RADAR.

&&

RB

Special weather statement, Aug 19, 11:58 AM CDT, 1 hour 8 minutes before

Special Weather Statement
National Weather Service Huntsville AL
1158 AM CDT Thu Aug 19 2021

ALZ010-191730-
DeKalb AL-
1158 AM CDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of southeastern DeKalb
County through 1230 PM CDT...

At 1158 AM CDT, Doppler radar was tracking a strong thunderstorm over
Fort Payne, moving east at 20 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Fort Payne, Valley Head, Hammondville, Mentone, Dog Town, Collbran,
Sulpher Springs, Adamsburg, Desoto State Park and Little River Canyon
NP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3448 8558 3444 8558 3441 8561 3437 8563
      3436 8566 3433 8569 3433 8583 3475 8558
      3473 8555 3453 8551
TIME...MOT...LOC 1658Z 264DEG 18KT 3445 8568

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 7:39 PM CDT	Severe Thunderstorm Warning	HUN	Madison	36 min
Aug 19, 8:17 AM CDT	Special Weather Statement	HUN	Morgan	43 min
Aug 19, 9:04 AM CDT	Special Weather Statement	HUN	Cullman, Morgan	41 min
Aug 19, 9:47 AM CDT	Flash Flood Warning	HUN	Cullman	3 hr
Aug 19, 10:32 AM CDT	Special Weather Statement	HUN	Marshall	43 min
Aug 19, 11:05 AM CDT	Special Weather Statement	HUN	DeKalb	55 min
Aug 19, 11:58 AM CDT	Special Weather Statement	HUN	DeKalb	32 min
Aug 19, 2:22 PM CDT	Special Weather Statement	HUN	Franklin	38 min
Aug 19, 2:49 PM CDT	Special Weather Statement	HUN	Franklin	41 min
Aug 19, 4:45 PM CDT	Flash Flood Warning Emergency	HUN	Franklin	3 hr
Aug 19, 5:51 PM CDT	Flash Flood Warning	HUN	Franklin	2 hr
Aug 19, 6:18 PM CDT	Special Weather Statement	HUN	Madison	27 min
Aug 19, 6:45 PM CDT	Special Weather Statement	HUN	Madison	45 min
Aug 18, 8:36 PM CDT	Special Weather Statement	HUN	Franklin	24 min

Nearby

Areal Flood Warnings in Alabama, 2021 Every areal flood warning 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.