Alert archive / Georgia / Flash Flood Watches in 2013

Flash Flood Watch 2, NWS Jacksonville, FL

August 20, 20139 counties in Georgia

NWS Jacksonville, FL issued this flash flood watch at Aug 20, 2013, 3:43 AM EDT for 9 counties in Georgia. It took effect at Aug 20, 2013, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Aug 20, 2013, 3:43 AM EDT (07:43 UTC)
In effect from: Aug 20, 2013, 12:00 PM EDT
Expired: Aug 20, 2013, 8:16 PM EDT
In force: 8 hr
Issued by: NWS Jacksonville, FL
Flood severity: None

Counties Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Coffee County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Wayne County, GA

The radar

The Moody AFB radar (KVAX), 93 km from the middle of the area, began a volume at 07:46 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 7.7 hours before the alert went out and 225 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: 1410 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 928 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 21 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 watch 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 watch went out at Aug 19, 8:37 PM EDT, 7 hours 6 minutes earlier.

Area forecast discussion, Aug 19, 8:37 PM EDT, 7 hours 6 minutes before

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Hazardous weather outlook, Aug 19, 2:30 PM EDT, 13 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
230 PM EDT MON AUG 19 2013

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-201000-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL OUT 20 NM-
FERNANDINA BEACH TO ST AUGUSTINE FL OUT 20 NM-
ST AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL 20 NM TO 60 NM OFFSHORE-
FERNANDINA BEACH TO ST AUGUSTINE FL 20 NM TO 60 NM OFFSHORE-
ST AUGUSTINE TO FLAGLER BEACH FL 20 NM TO 60 NM OFFSHORE-HAMILTON-
SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY-ST JOHNS-
GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE-JEFF DAVIS-BACON-
APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-INLAND GLYNN-
COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-COASTAL CAMDEN-
230 PM EDT MON AUG 19 2013

...MODERATE RISK OF RIP CURRENTS TODAY...

...ELEVATED WATER LEVELS ALONG THE COAST THROUGH WEDNESDAY...

...LOCALLY HEAVY RAINFALL THE MAIN THREAT IN STORMS TODAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST FLORIDA...SOUTHEAST
GEORGIA AND THE ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT...

SCATTERED THUNDERSTORMS WILL PREVAIL THIS AFTERNOON INTO THE EVENING.
A FEW OF THE STRONGER STORMS COULD PRODUCE GUSTY WINDS, FREQUENT
LIGHTNING AND LOCALLY HEAVY RAIN. STORM MOTION IS TOWARDS THE NORTH
AT 5 TO 10 MPH.

ELEVATED EASTERLY SWELL AND SURF WILL RESULT IN A MODERATE RISK OF
RIP CURRENTS AT AREA BEACHES. TIDAL DEPARTURES OF ONE HALF FOOT
ABOVE NORMAL WILL COMBINE WITH HIGHER ASTRONOMICAL TIDES TO PRODUCE
ELEVATED WATER LEVELS ALONG THE COASTAL REGION DURING THIS EVENINGS
HIGH TIDE CYCLE. VALUES ARE EXPECTED TO REMAIN BELOW MINOR COASTAL
FLOODING LEVELS AND A COASTAL FLOOD ADVISORY IS NOT EXPECTED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

ELEVATED WATER LEVELS DUE TO ONSHORE FLOW AND HIGHER ASTRONOMICAL
TIDES WILL CONTINUE TUESDAY AND WEDNESDAY DURING TIMES OF HIGH TIDE.

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE EACH
AFTERNOON AND EVENING...WITH A FEW STORMS CAPABLE OF PRODUCING GUSTY
WINDS AND LOCALLY HEAVY RAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME. SPOTTERS ARE
ENCOURAGED TO RELAY ANY REPORTS OF FLOODING TO LOCAL LAW ENFORCEMENT
AND THE NATIONAL WEATHER SERVICE IN JACKSONVILLE.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.

In the hours before

Local storm report, Aug 19, 9:50 PM EDT, 5 hours 53 minutes before

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Local storm report, Aug 19, 10:25 PM EDT, 5 hours 18 minutes before

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Local storm report, Aug 19, 10:47 PM EDT, 4 hours 56 minutes 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
Aug 19, 9:15 PM EDT	Special Weather Statement	JAX	Marion	45 min
Aug 20, 4:30 PM EDT	Special Weather Statement	JAX	Baker	30 min
Aug 20, 4:42 PM EDT	Areal Flood Advisory	JAX	Baker	48 min
Aug 20, 5:30 PM EDT	Special Weather Statement	JAX	Suwannee	30 min
Aug 20, 6:00 PM EDT	Special Weather Statement	JAX	Suwannee	30 min
Aug 20, 6:04 PM EDT	Areal Flood Advisory	JAX	Suwannee	41 min
Aug 20, 6:47 PM EDT	Special Weather Statement	JAX	Gilchrist	28 min
Aug 20, 7:10 PM EDT	Areal Flood Advisory	JAX	Gilchrist	50 min
Aug 19, 8:42 PM EDT	Areal Flood Advisory	JAX	Appling, Pierce, Wayne	2 hr
Aug 19, 9:06 PM EDT	Areal Flood Warning	JAX	Appling, Pierce, Wayne	114 min
Aug 19, 9:45 PM EDT	Flash Flood Warning	JAX	Wayne	3 hr
Aug 20, 12:02 AM EDT	Areal Flood Warning	JAX	Appling	3 hr
Aug 20, 12:20 AM EDT	Areal Flood Warning	JAX	Bacon	3 hr
Aug 20, 12:51 AM EDT	Areal Flood Warning	JAX	Wayne	6 hr
Aug 20, 9:56 AM EDT	River Flood Warning	JAX	Jeff Davis, Montgomery, Toombs	9 days
Aug 20, 9:56 AM EDT	River Flood Warning	JAX	Glynn, McIntosh, Wayne	16 days
Aug 20, 3:13 PM EDT	Special Weather Statement	JAX	Ware	47 min
Aug 20, 5:35 PM EDT	Special Weather Statement	JAX	Appling	40 min

Nearby

Flash Flood Watches in Georgia, 2013 Every flash flood watch in 2013

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.