Alert archive / Alabama / Flash Flood Warnings in 2021

Flash Flood Warning 44, NWS Huntsville, AL

October 5, 2021Lauderdale County, Alabama

NWS Huntsville, AL issued this flash flood warning at Oct 5, 2021, 5:46 PM CDT for Lauderdale County, Alabama. It was in force for 89 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 5, 2021, 5:46 PM CDT (22:46 UTC)
Expired: Oct 5, 2021, 7:15 PM CDT
In force: 89 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Lauderdale County, AL

The radar

The Northeast Alabama radar (KHTX), 130 km from the middle of the area, began a volume at 22:45 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.

What was reported inside it

Time	Report	Where	Remark
Oct 5, 5:51 PM CDT	FLASH FLOOD	2 E Killen, AL	WATER BACKING UP INTO THE BACKYARDS OF SOME HOMES ALONG HICKORY PARK ROAD IN KILLEN. SPILLWAY HAS ALSO BEEN BLOCKED BY DEBRIS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.8 hours before the alert went out and 163 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: 44 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1048 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

125 
WGUS54 KHUN 052246
FFWHUN
ALC077-060015-
/O.NEW.KHUN.FF.W.0044.211005T2246Z-211006T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Huntsville AL
546 PM CDT Tue Oct 5 2021

The National Weather Service in Huntsville has issued a

* Flash Flood Warning for...
  Northeastern Lauderdale County in northwestern Alabama...

* Until 715 PM CDT.

* At 546 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Killen, Green Hill and Center Star.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3483 8760 3500 8761 3500 8742 3480 8741
      3480 8742 3483 8751 3483 8752

FLASH FLOOD...RADAR INDICATED

$$

09

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 5, 2:13 PM CDT	Special Weather Statement	HUN	Colbert	32 min
Oct 5, 6:58 PM CDT	Flash Flood Warning	HUN	Colbert, Lauderdale	3 hr

Nearby

Flash Flood Warnings in Alabama, 2021 Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.