Alert archive / Tennessee / Areal Flood Advisories in 2021
Areal Flood Advisory 99, NWS Nashville, TN
NWS Nashville, TN issued this areal flood advisory at Aug 19, 2021, 7:17 PM CDT for Lawrence County, Tennessee. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2021, 7:17 PM CDT (00:17 UTC)
- Expired
- Aug 19, 2021, 10:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
County Lawrence County, TN
The radar
The Northeast Alabama radar (KHTX), 124 km from the middle of the area, began a volume at 00:18 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 00:00Z, 0.3 hours before the alert went out and 233 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.
- Mixed-layer CAPE
- 409 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 812 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Nashville, TN wrote its last area forecast discussion before this areal flood advisory went out at Aug 19, 6:00 PM CDT, 1 hour 17 minutes earlier.
Area forecast discussion, Aug 19, 6:00 PM CDT, 1 hour 17 minutes before
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</html>Hazardous weather outlook, Aug 19, 5:13 AM CDT, 14 hours 4 minutes before
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</html>The office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 4:55 PM CDT | Flash Flood Watch | OHX | Bedford, Cheatham, Dickson, Giles, Hickman, Houston and 10 more | 30 hr |
Nearby
Areal Flood Advisories in Tennessee, 2021Every areal flood advisory 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.