Alert archive / Florida / Flash Flood Warnings in 2021
Flash Flood Warning 6, NWS Jacksonville, FL
NWS Jacksonville, FL issued this flash flood warning at Sep 16, 2021, 6:07 PM EDT for Clay County, Duval County, Saint Johns County, Florida. 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 outline as issued.
The facts
- Issued
- Sep 16, 2021, 6:07 PM EDT (22:07 UTC)
- Expired
- Sep 16, 2021, 9:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clay County, FL, Duval County, FL, Saint Johns County, FL
The radar
The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 22:09 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
Jacksonville, FL (KJAX), launched 12:00Z, 10.1 hours before the alert went out and 18 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
- 1536 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 760 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
739
WGUS52 KJAX 162207
FFWJAX
FLC019-031-109-170115-
/O.NEW.KJAX.FF.W.0006.210916T2207Z-210917T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jacksonville FL
607 PM EDT Thu Sep 16 2021
The National Weather Service in Jacksonville has issued a
* Flash Flood Warning for...
Northeastern Clay County in northeastern Florida...
Central Duval County in northeastern Florida...
Northwestern St. Johns County in northeastern Florida...
* Until 915 PM EDT.
* At 607 PM EDT, 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 3 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...
Jacksonville, Orange Park, Arlington, Mandarin, Fruit Cove,
Riverside, Ortega, San Marco, Nas Jax, Normandy,
Bellair-Meadowbrook Terrace, Cisco Gardens, Lakeside, Doctors
Inlet, Fleming Island, Tallyrand and Jacksonville Heights.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3041 8180 3042 8178 3046 8175 3046 8170
3047 8166 3046 8164 3046 8159 3041 8155
3033 8156 3029 8158 3018 8159 3017 8160
3008 8162 3011 8179
FLASH FLOOD...RADAR INDICATED
$$
NGUYENThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 3:02 PM EDT | Special Weather Statement | JAX | Duval, Nassau | 28 min |
| Sep 16, 4:55 PM EDT | Special Weather Statement | JAX | Nassau | 35 min |
| Sep 16, 5:28 PM EDT | Special Weather Statement | JAX | Duval | 32 min |
| Sep 16, 5:55 PM EDT | Special Weather Statement | JAX | Duval | 35 min |
Nearby
Flash Flood Warnings in Florida, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.