Alert archive / Florida / Areal Flood Warnings in 2015

Areal Flood Warning 21, NWS Jacksonville, FL

August 1, 2015Gilchrist County, Florida

NWS Jacksonville, FL issued this areal flood warning at Aug 1, 2015, 8:45 AM EDT for Gilchrist 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 counties it named.

The facts

Issued: Aug 1, 2015, 8:45 AM EDT (12:45 UTC)
Expired: Aug 1, 2015, 11:45 AM EDT
In force: 3 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

County Gilchrist County, FL

The radar

The Moody AFB radar (KVAX), 131 km from the middle of the area, began a volume at 12:49 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 12:00Z, 0.8 hours before the alert went out and 163 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: 513 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: -7 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 areal 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 areal flood warning went out at Aug 1, 4:44 AM EDT, 4 hours 1 minute earlier.

Area forecast discussion, Aug 1, 4:44 AM EDT, 4 hours 1 minute before

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Hazardous weather outlook, Aug 1, 4:51 AM EDT, 3 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
451 AM EDT SAT AUG 1 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-020900-
COASTAL WATERS FROM ALTAMAHA SOUND TO FERNANDINA BEACH FL OUT
20 NM-
COASTAL WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL OUT
20 NM-
COASTAL WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
WATERS FROM ALTAMAHA SOUND GA TO FERNANDINA BEACH FL FROM 20 TO
60 NM-
WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL FROM 20 TO 60 NM-
WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL FROM 20 TO 60 NM-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-INLAND NASSAU-INLAND DUVAL-UNION-
BRADFORD-CLAY-ST. JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-
COASTAL NASSAU-COASTAL DUVAL-COFFEE-JEFF DAVIS-BACON-APPLING-
WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-INLAND GLYNN-COASTAL GLYNN-
ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-COASTAL CAMDEN-
451 AM EDT SAT AUG 1 2015

...HEAVY RAINFALL POSSIBLE THIS WEEKEND...

...FLOOD WATCH IN EFFECT FOR NORTH CENTRAL FLORIDA...

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

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

HEAVY RAINFALL SHOULD BE EXPECTED WITH SHOWERS AND THUNDERSTORMS
THROUGH TONIGHT. BEST CHANCE TO SEE HEAVY RAINFALL AND FLOODING
WILL BE IN THE SUWANNEE VALLEY AREA FROM I-75 WESTWARD.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

SCATTERED TO NUMEROUS SHOWERS AND STORMS ARE EXPECTED EACH
AFTERNOON AND EVENING. LOCALLY HEAVY RAINFALL AND FREQUENT
LIGHTNING ARE THE MAIN CONCERNS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

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

WALSH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 4:22 AM EDT	Flood Watch	JAX	Gilchrist, Suwannee	35 hr
Aug 1, 3:56 PM EDT	Areal Flood Advisory	JAX	Hamilton, Suwannee	94 min
Aug 1, 5:12 PM EDT	Areal Flood Advisory	JAX	Columbia	63 min
Jul 31, 8:02 PM EDT	Areal Flood Warning	JAX	Glynn	118 min
Jul 31, 9:10 PM EDT	Special Weather Statement	JAX	Echols	65 min
Jul 31, 9:50 PM EDT	Areal Flood Warning	JAX	Glynn	115 min
Aug 1, 5:05 PM EDT	Areal Flood Advisory	JAX	Charlton	55 min
Aug 1, 6:11 PM EDT	Special Weather Statement	JAX	Wayne	49 min
Aug 1, 6:51 PM EDT	Special Weather Statement	JAX	Appling, Jeff Davis	54 min
Aug 1, 7:06 PM EDT	Areal Flood Advisory	JAX	Appling, Jeff Davis, Wayne	114 min
Aug 1, 7:31 PM EDT	Special Weather Statement	JAX	Appling, Bacon, Jeff Davis	59 min

Nearby

Areal Flood Warnings in Florida, 2015 Every areal flood warning in 2015

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.