Alert archive / Alabama / Flash Flood Warnings in 2019

Flash Flood Warning 17, NWS Huntsville, AL

July 18, 20194 counties in Alabama

NWS Huntsville, AL issued this flash flood warning at Jul 18, 2019, 1:20 AM CDT for 4 counties in Alabama. It was in force for 3 hr. 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 18, 2019, 1:20 AM CDT (06:20 UTC)
Expired: Jul 18, 2019, 4:15 AM CDT
In force: 3 hr
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

Counties Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 106 km from the middle of the area, began a volume at 06:19 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

Nashville Metro, TN (KBNA), launched 00:00Z, 6.3 hours before the alert went out and 171 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: 878 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1259 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 111 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 Jul 18, 12:38 AM CDT, 42 minutes earlier.

Area forecast discussion, Jul 18, 12:38 AM CDT, 42 minutes before

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Hazardous weather outlook, Jul 17, 9:15 PM CDT, 4 hours 5 minutes before

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In the hours before

Special weather statement, Jul 17, 11:28 PM CDT, 1 hour 52 minutes before

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Special weather statement, Jul 17, 11:51 PM CDT, 1 hour 29 minutes before

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Special weather statement, Jul 18, 12:14 AM CDT, 1 hour 6 minutes before

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Special weather statement, Jul 18, 12:21 AM CDT, 59 minutes before

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Special weather statement, Jul 18, 12:48 AM CDT, 32 minutes before

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Special weather statement, Jul 18, 12:49 AM CDT, 31 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:19 PM CDT	Special Weather Statement	HUN	Madison	26 min
Jul 17, 7:44 PM CDT	Special Weather Statement	HUN	Madison	31 min
Jul 17, 8:15 PM CDT	Special Weather Statement	HUN	Madison	30 min
Jul 17, 8:22 PM CDT	Special Weather Statement	HUN	Limestone	23 min
Jul 17, 10:50 PM CDT	Special Weather Statement	HUN	Limestone	40 min
Jul 17, 11:25 PM CDT	Special Weather Statement	HUN	Limestone	35 min
Jul 17, 11:28 PM CDT	Special Weather Statement	HUN	Marshall	32 min
Jul 17, 11:51 PM CDT	Special Weather Statement	HUN	Limestone, Madison	24 min
Jul 18, 12:14 AM CDT	Special Weather Statement	HUN	Marshall	31 min
Jul 18, 12:21 AM CDT	Special Weather Statement	HUN	Lawrence, Morgan	24 min
Jul 18, 12:48 AM CDT	Special Weather Statement	HUN	Madison	27 min
Jul 18, 12:49 AM CDT	Special Weather Statement	HUN	Limestone	41 min
Jul 18, 1:07 AM CDT	Flash Flood Warning	HUN	Madison	83 min
Jul 18, 1:24 AM CDT	Special Weather Statement	HUN	Marshall	36 min
Jul 18, 1:41 AM CDT	Special Weather Statement	HUN	Lawrence	49 min
Jul 18, 1:47 AM CDT	Special Weather Statement	HUN	Lauderdale	43 min
Jul 18, 4:59 AM CDT	Heat Advisory	HUN	Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more	14 hr
Jul 18, 5:27 PM CDT	Special Weather Statement	HUN	Madison	48 min
Jul 18, 5:54 PM CDT	Special Weather Statement	HUN	Madison	51 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.