Alert archive / Florida / Flash Flood Warnings in 2024

Flash Flood Warning 17, NWS Jacksonville, FL

September 27, 2024Hamilton County, Suwannee County, Florida; Echols County, Georgia

NWS Jacksonville, FL issued this flash flood warning at Sep 27, 2024, 12:27 AM EDT for Hamilton County, Suwannee County, Florida; Echols County, Georgia. 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 counties it named.

The facts

Issued: Sep 27, 2024, 12:27 AM EDT (04:27 UTC)
Expired: Sep 27, 2024, 3:15 AM EDT
In force: 3 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

Counties Hamilton County, FL, Suwannee County, FL, Echols County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 4.5 hours before the alert went out and 119 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: 628 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 501 m²/s²
0-3 km storm-relative helicity: 614 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 22.0

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 Sep 27, 12:10 AM EDT, 17 minutes earlier.

Area forecast discussion, Sep 27, 12:10 AM EDT, 17 minutes before

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In the hours before

Local storm report, Sep 26, 10:28 PM EDT, 1 hour 59 minutes before

Preliminary Local Storm Report
National Weather Service Jacksonville FL
1028 PM EDT Thu Sep 26 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1020 PM     Tropical Cyclone 1 N Neptune Beach       30.32N 81.39W
09/26/2024                   Duval              FL   Mesonet

            Mesonet station 1482W Fswn Duval Neptune
            Beach reported wind gust of 65 mph.

&&

LEV

Local storm report, Sep 26, 11:03 PM EDT, 1 hour 24 minutes before

Preliminary Local Storm Report
National Weather Service Jacksonville FL
1103 PM EDT Thu Sep 26 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1101 PM     Tropical Cyclone Winfield                30.26N 82.68W
09/26/2024                   Columbia           FL   Public

            A potential tornado was reported by the
            public to dispatch to pass over US 41 near
            I-10.

&&

KC

Local storm report, Sep 26, 11:23 PM EDT, 1 hour 4 minutes before

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Local storm report, Sep 26, 11:28 PM EDT, 59 minutes before

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Local storm report, Sep 26, 11:40 PM EDT, 47 minutes before

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Local storm report, Sep 27, 12:11 AM EDT, 16 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 8:07 PM EDT	Special Marine Warning	JAX		23 min
Sep 26, 8:11 PM EDT	Special Marine Warning	JAX		64 min
Sep 26, 8:17 PM EDT	Special Marine Warning	JAX		28 min
Sep 26, 8:45 PM EDT	Special Marine Warning	JAX		30 min
Sep 26, 9:56 PM EDT	Extreme Wind Warning	JAX	Hamilton, Suwannee	2 hr
Sep 26, 11:04 PM EDT	Tornado Warning Tornado observed	JAX	Columbia, Hamilton	26 min
Sep 27, 12:02 AM EDT	Extreme Wind Warning	JAX	Hamilton, Suwannee	65 min
Sep 27, 8:10 AM EDT	Small Craft Advisory	JAX		18 hr
Sep 27, 10:35 AM EDT	Wind Advisory	JAX	Duval, Flagler, Nassau	3 hr
Sep 26, 8:16 PM EDT	Tornado Warning	JAX	Camden, Glynn	29 min
Sep 26, 8:49 PM EDT	Tornado Warning	JAX	Glynn	26 min
Sep 26, 9:13 PM EDT	Tornado Warning	JAX	Glynn	17 min
Sep 26, 11:24 PM EDT	River Flood Warning	JAX	Echols	46 hr
Sep 26, 11:26 PM EDT	River Flood Warning	JAX	Jeff Davis, Montgomery, Toombs	15 days
Sep 26, 11:26 PM EDT	River Flood Warning	JAX	Appling, Tattnall, Toombs, Wayne	17 days
Sep 26, 11:42 PM EDT	Extreme Wind Warning	JAX	Echols	85 min
Sep 27, 1:17 AM EDT	Flash Flood Warning	JAX	Atkinson, Clinch	4 hr
Sep 27, 2:11 AM EDT	Flash Flood Warning	JAX	Atkinson, Bacon, Coffee, Jeff Davis	4 hr

Nearby

Flash Flood Warnings in Florida, 2024 Flash Flood Warnings in Georgia, 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.