Alert archive / Alabama / Flash Flood Warnings in 2019

Flash Flood Warning 18, NWS Huntsville, AL

August 3, 2019Madison County, Alabama

NWS Huntsville, AL issued this flash flood warning at Aug 3, 2019, 1:45 PM CDT for Madison County, Alabama. It was in force for 51 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 3, 2019, 1:45 PM CDT (18:45 UTC)
Expired: Aug 3, 2019, 2:36 PM CDT
In force: 51 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 46 km from the middle of the area, began a volume at 18:45 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, 6.8 hours before the alert went out and 177 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: 424 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -7 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 flash 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 flash flood warning went out at Aug 3, 12:35 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Aug 3, 12:35 PM CDT, 1 hour 10 minutes before

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Hazardous weather outlook, Aug 3, 3:51 AM CDT, 9 hours 54 minutes before

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In the hours before

Special weather statement, Aug 3, 12:57 PM CDT, 48 minutes before

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Special weather statement, Aug 3, 1:13 PM CDT, 32 minutes before

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Special weather statement, Aug 3, 1:32 PM CDT, 13 minutes before

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Special weather statement, Aug 3, 1:42 PM CDT, 3 minutes before

Special Weather Statement
National Weather Service Huntsville AL
142 PM CDT Sat Aug 3 2019

ALZ005-031930-
Limestone AL-
142 PM CDT Sat Aug 3 2019

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LIMESTONE COUNTY UNTIL
230 PM CDT...

At 142 PM CDT, Doppler radar was tracking a strong thunderstorm over
Athens. This storm was nearly stationary.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Athens, Tanner, French Mill and Belle Mina.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong gusty winds will be capable of knocking down small tree limbs
along with other small unsecured items. Seek safe shelter until this
storm has passed.

&&

LAT...LON 3479 8680 3464 8689 3469 8711 3470 8712
      3484 8707
TIME...MOT...LOC 1842Z 176DEG 2KT 3480 8698

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 7:04 PM CDT	Special Weather Statement	HUN	Jackson	26 min
Aug 2, 7:07 PM CDT	Special Weather Statement	HUN	Lauderdale	23 min
Aug 2, 7:27 PM CDT	Special Weather Statement	HUN	Madison	33 min
Aug 3, 12:57 PM CDT	Special Weather Statement	HUN	Colbert	48 min
Aug 3, 1:13 PM CDT	Special Weather Statement	HUN	Madison	47 min
Aug 3, 1:32 PM CDT	Special Weather Statement	HUN	Morgan	43 min
Aug 3, 1:42 PM CDT	Special Weather Statement	HUN	Limestone	48 min
Aug 3, 1:51 PM CDT	Special Weather Statement	HUN	Cullman	39 min
Aug 3, 2:14 PM CDT	Special Weather Statement	HUN	Limestone	46 min
Aug 3, 2:24 PM CDT	Special Weather Statement	HUN	Cullman	51 min
Aug 3, 4:10 PM CDT	Special Weather Statement	HUN	Marshall	50 min
Aug 3, 4:22 PM CDT	Special Weather Statement	HUN	Lauderdale	53 min
Aug 3, 5:07 PM CDT	Flash Flood Warning	HUN	Lauderdale	113 min

Nearby

Flash Flood Warnings in Alabama, 2019 Every flash flood warning in 2019

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.