Alert archive / Florida / Flash Flood Warnings in 2024

Flash Flood Warning 22, NWS Jacksonville, FL

October 9, 2024Clay County, Saint Johns County, Florida

NWS Jacksonville, FL issued this flash flood warning at Oct 9, 2024, 3:03 PM EDT for Clay County, Saint Johns County, Florida. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 9, 2024, 3:03 PM EDT (19:03 UTC)
Expired: Oct 9, 2024, 9:00 PM EDT
In force: 6 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

Counties Clay County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 60 km from the middle of the area, began a volume at 19:02 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, 7.1 hours before the alert went out and 62 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: 23 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 159 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this flash flood warning went out at Oct 9, 11:37 AM EDT, 3 hours 26 minutes earlier.

Area forecast discussion, Oct 9, 11:37 AM EDT, 3 hours 26 minutes before

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In the hours before

Local storm report, Oct 9, 12:03 PM EDT, 3 hours before

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Local storm report, Oct 9, 12:49 PM EDT, 2 hours 14 minutes before

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Local storm report, Oct 9, 2:04 PM EDT, 59 minutes before

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Local storm report, Oct 9, 2:41 PM EDT, 22 minutes before

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Local storm report, Oct 9, 2:50 PM EDT, 13 minutes before

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Local storm report, Oct 9, 3:02 PM EDT, 1 minute before

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The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 9, 12:02 AM EDT	Special Marine Warning	JAX		58 min
Oct 9, 1:59 AM EDT	Rip Current Statement	JAX	Duval, Flagler, Nassau	5 days
Oct 9, 1:59 AM EDT	High Surf Advisory	JAX	Duval, Flagler, Nassau	3 days
Oct 9, 10:11 AM EDT	Flash Flood Warning	JAX	Saint Johns	17 hr
Oct 9, 10:38 AM EDT	Wind Advisory	JAX	Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more	30 hr
Oct 9, 10:49 AM EDT	Flash Flood Warning	JAX	Clay, Flagler, Putnam, Saint Johns	16 hr
Oct 9, 3:12 PM EDT	Flash Flood Warning	JAX	Flagler, Putnam, Saint Johns	6 hr
Oct 9, 5:20 PM EDT	Flash Flood Warning	JAX	Flagler, Marion, Putnam	10 hr
Oct 9, 5:45 PM EDT	Flash Flood Warning	JAX	Alachua, Marion, Putnam	9 hr

Nearby

Flash Flood Warnings in Florida, 2024 Every flash flood warning in 2024

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.