Alert archive / Alabama / Flash Flood Watches in 2020

Flash Flood Watch 2, NWS Huntsville, AL

February 5, 202011 counties in Alabama; Franklin County, Lincoln County, Moore County, Tennessee

NWS Huntsville, AL issued this flash flood watch at Feb 5, 2020, 8:45 AM CST for 11 counties in Alabama; Franklin County, Lincoln County, Moore County, Tennessee. It took effect at Feb 5, 2020, 3:20 PM CST. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued: Feb 5, 2020, 8:45 AM CST (14:45 UTC)
In effect from: Feb 5, 2020, 3:20 PM CST
Expired: Feb 6, 2020, 10:16 AM CST
In force: 19 hr
Issued by: NWS Huntsville, AL
Flood severity: None

Counties Colbert County, AL, Cullman County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Franklin County, TN, Lincoln County, TN, Moore County, TN

The radar

The Northeast Alabama radar (KHTX), 69 km from the middle of the area, began a volume at 14:45 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

Nashville Metro, TN (KBNA), launched 12:00Z, 2.8 hours before the alert went out and 159 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 93 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 watch 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 watch went out at Feb 5, 5:18 AM CST, 3 hours 27 minutes earlier.

Area forecast discussion, Feb 5, 5:18 AM CST, 3 hours 27 minutes before

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Hazardous weather outlook, Feb 5, 4:20 AM CST, 4 hours 25 minutes before

Hazardous Weather Outlook
National Weather Service Huntsville AL
420 AM CST Wed Feb 5 2020

ALZ001>010-016-TNZ076-096-097-061000-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
420 AM CST Wed Feb 5 2020

This Hazardous Weather Outlook is for north Alabama and portions of
southern middle Tennessee.

.DAY ONE...Today and Tonight...

Scattered embedded thunderstorms within numerous to widespread
showers are expected later today into this evening. A few of these
storms could be severe and will be capable of damaging winds along
with hail and a few tornadoes. The threat for severe weather will be
from late this afternoon through the late evening.

In addition, locally heavy downpours in a short period of time could
lead to a few instances of flash flooding. Resulting runoff may also
result in minor flooding of area rivers and streams.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

No hazardous weather is expected at this time.

.SPOTTER CALL TO ACTION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible later today into this evening.

In the hours before

Special weather statement, Feb 5, 6:44 AM CST, 2 hours 1 minute before

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Special weather statement, Feb 5, 8:19 AM CST, 26 minutes before

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Special weather statement, Feb 5, 8:38 AM CST, 7 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
Feb 5, 6:44 AM CST	Special Weather Statement	HUN	Cullman	31 min
Feb 5, 8:19 AM CST	Special Weather Statement	HUN	Madison, Morgan	26 min
Feb 5, 8:38 AM CST	Special Weather Statement	HUN	Morgan	37 min
Feb 5, 9:08 AM CST	Special Weather Statement	HUN	Madison, Morgan	52 min
Feb 5, 9:53 AM CST	Special Weather Statement	HUN	Jackson	52 min
Feb 5, 10:09 AM CST	Special Weather Statement	HUN	Madison	36 min
Feb 5, 10:23 AM CST	Special Weather Statement	HUN	Madison	22 min
Feb 5, 10:32 AM CST	Special Weather Statement	HUN	Colbert, Franklin	43 min
Feb 5, 10:39 AM CST	Areal Flood Warning	HUN	Jackson, Madison	12 hr
Feb 5, 10:52 AM CST	Special Weather Statement	HUN	Jackson	38 min
Feb 5, 10:55 AM CST	River Flood Warning	HUN	Madison	50 hr
Feb 5, 10:55 AM CST	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	20 min
Feb 5, 11:00 AM CST	River Flood Warning	HUN	Lawrence	62 hr
Feb 5, 11:11 AM CST	Special Weather Statement	HUN	Limestone	49 min
Feb 5, 11:18 AM CST	Special Weather Statement	HUN	Lawrence	42 min
Feb 5, 11:53 AM CST	Areal Flood Warning	HUN	Madison	6 hr
Feb 5, 11:57 AM CST	Special Weather Statement	HUN	Limestone	48 min
Feb 5, 12:00 PM CST	Special Weather Statement	HUN	Limestone	45 min
Feb 5, 1:53 PM CST	Areal Flood Warning	HUN	Franklin	6 hr
Feb 5, 4:53 PM CST	Severe Thunderstorm Warning	HUN	Colbert, Franklin, Lauderdale	52 min
Feb 5, 4:55 PM CST	Special Weather Statement	HUN	Franklin	50 min
Feb 5, 5:08 PM CST	Tornado Warning	HUN	Colbert, Lauderdale	37 min
Feb 5, 5:41 PM CST	Special Weather Statement	HUN	Colbert, Lauderdale, Lawrence	49 min
Feb 5, 5:45 PM CST	Areal Flood Warning	HUN	Madison	4 hr
Feb 5, 5:55 PM CST	Areal Flood Warning	HUN	Colbert, Franklin, Lauderdale, Lawrence	9 hr
Feb 5, 12:43 PM CST	Special Weather Statement	HUN	Franklin, Moore	47 min
Feb 5, 1:01 PM CST	Special Weather Statement	HUN	Franklin	29 min
Feb 5, 1:27 PM CST	Special Weather Statement	HUN	Franklin	33 min
Feb 5, 2:02 PM CST	Areal Flood Warning	HUN	Moore	6 hr
Feb 5, 3:08 PM CST	River Flood Warning	HUN	Franklin, Lincoln	46 hr

Nearby

Flash Flood Watches in Alabama, 2020 Flash Flood Watches in Tennessee, 2020 Every flash flood watch 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.