Alert archive / Tennessee / Flash Flood Warnings in 2021
Flash Flood Warning 82, NWS Memphis, TN
NWS Memphis, TN issued this flash flood warning at Aug 19, 2021, 6:26 PM CDT for Shelby County, Tennessee. It was in force for 100 min. 2 reports 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
- Aug 19, 2021, 6:26 PM CDT (23:26 UTC)
- Expired
- Aug 19, 2021, 8:06 PM CDT
- In force
- 100 min
- Issued by
- NWS Memphis, TN
- Area
- Storm-based polygon
- Flood severity
- None
County Shelby County, TN
The radar
The Memphis radar (KNQA), 35 km from the middle of the area, began a volume at 23:27 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 |
|---|---|---|---|
| Aug 19, 6:30 PM CDT | FLASH FLOOD | 1 Wnw Collierville, TN | ESTIMATED 1 FOOT OF WATER COVERING BYHALIA ROAD SOUTH OF W POWELL ROAD. |
| Aug 19, 6:50 PM CDT | FLASH FLOOD | Collierville, TN | AT LEAST 6 INCHES OF WATER COVERING KING RIDGE DRIVE BETWEEN SIX CROWNS STREET AND KING RIDGE COVE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 11.4 hours before the alert went out and 34 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
- 319 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
843
WGUS54 KMEG 192326
FFWMEG
TNC157-200215-
/O.NEW.KMEG.FF.W.0082.210819T2326Z-210820T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
626 PM CDT Thu Aug 19 2021
The National Weather Service in Memphis has issued a
* Flash Flood Warning for...
Southeastern Shelby County in western Tennessee...
* Until 915 PM CDT.
* At 626 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...
Collierville, Germantown, Memphis, Piperton and White Station.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3500 8968 3509 8994 3515 8991 3511 8964
3510 8964 3507 8964 3504 8964 3500 8964
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
293
WGUS74 KMEG 200106
FFSMEG
Flash Flood Statement
National Weather Service Memphis TN
806 PM CDT Thu Aug 19 2021
TNC157-200116-
/O.CAN.KMEG.FF.W.0082.000000T0000Z-210820T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Shelby TN-
806 PM CDT Thu Aug 19 2021
...FLASH FLOOD WARNING FOR SOUTHEASTERN SHELBY COUNTY HAS BEEN
REPLACED WITH A FLOOD ADVISORY...
LAT...LON 3500 8968 3509 8994 3515 8991 3511 8964
3510 8964 3507 8964 3504 8964 3500 8964
$$
SGWThe office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:10 PM CDT | Areal Flood Advisory | MEG | Shelby | 16 min |
Nearby
Flash Flood Warnings in Tennessee, 2021Every 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.