Alert archive / Florida / Coastal Flood Statements in 2007

Coastal Flood Statement 2, NWS Jacksonville, FL

April 21, 2007Nassau County, Florida

NWS Jacksonville, FL issued this coastal flood statement at Apr 21, 2007, 3:42 AM EDT for Nassau County, Florida. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Apr 21, 2007, 3:42 AM EDT (07:42 UTC)
Expired: Apr 21, 2007, 1:00 PM EDT
In force: 9 hr
Issued by: NWS Jacksonville, FL

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 07:40 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 00:00Z, 7.7 hours before the alert went out and 14 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -105 m²/s²
0-3 km storm-relative helicity: -86 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 coastal flood statement 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 coastal flood statement went out at Apr 21, 3:15 AM EDT, 27 minutes earlier.

Area forecast discussion, Apr 21, 3:15 AM EDT, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
315 AM EDT SAT APR 21 2007

.SHORT TERM...NORTHEAST LOW LEVEL FLOW OVER THE AREA THIS MORNING
WITH WINDS STRONGER OVER NE FL THAN SE GA DUE TO TIGHTER PRESSURE
GRADIENT THERE. RADARS SHOW ISOLATED SHOWERS OVER THE ATLANTIC
MOVING TOWARDS FLAGLER COUNTY. NAM80 HANDLING THIS PRECIP A
LITTLE BETTER THAN GFS40 WHICH IS A LITTLE TOO FAR SOUTH. NAM SHOWS
PRECIP ENDING BY 12Z BUT MAY INCLUDE ISOLATED POPS FOR FLAGLER
COUNTY THIS MORNING IF SHOWERS PERSIST AT ZONE RELEASE TIME.
ANOTHER BREEZY DAY(15-20 MPH) TODAY BUT NOT AS WINDY AS FRIDAY.
LARGE WILDFIRES IN WARE COUNTY GA AND NEAR FARGO GA WILL CONTINUE TO
PRODUCE SMOKE WITH NE FLOW PUSHING PLUME INTO CLINCH AND ECHOLS
COUNTIES. HAVE ADDED HAMILTON COUNTY FL IN DENSE SMOKE ADVISORY
THIS MORNING AS NCEP AIR QUALITY FORECAST GUIDANCE SHOWS SURFACE
SMOKE REACHING HAMILTON COUNTY EARLY THIS MORNING.

WINDS WILL DECREASE SUNDAY AND MONDAY AS SURFACE HIGH DROPS SOUTH
INTO OUR COASTAL WATERS. WINDS WILL VEER AND BECOME EASTERLY ON
SUNDAY AND SE ON MONDAY. THIS COMBINED WITH UPPER RIDGING WILL
ALLOW TEMPERATURES TO WARM BACK INTO THE LOWER 80S BY MONDAY
EXCEPT ALONG IMMEDIATE EAST COAST DUE TO RELATIVELY COOL WATER
TEMPERATURES.

.LONG TERM...TUESDAY THROUGH FRIDAY...GFS AND DGEX MODELS
CONTINUE TO SHOW COLD FRONT MOVING INTO THE AREA NEXT WEEKEND.
WITH MOISTURE INCREASING THERE WILL BE A CHANCE OF SHOWERS AND
THUNDERSTORMS AHEAD OF AND ALONG COLD FRONT FRIDAY AND SATURDAY.
TEMPERATURES WILL INCREASE TO ABOVE CLIMO AS FLOW BECOMES SW.

&&

.AVIATION...SOME TEMPO MVFR CIGS POSSIBLE ALONG THE NE FL COAST
LATER THIS MORNING. OTHERWISE...VFR CONDITIONS EXPECTED WITH WIND
GUSTS OF JUST OVER 20 KTS MIXING DOWN BY LATE MORNING.

&&

.MARINE...HAVE SCALED BACK HIGH SURF ADVISORY TO JUST FLAGLER AND
SAINT JOHNS COUNTIES FOR A FEW BREAKERS AROUND 7 FT. HAVE ALSO
EXTENDED ADVISORY TO 1 PM TO INCLUDED NEXT HIGH TIDE TIME AT
ST AUGUSTINE BEACH. SMALL CRAFT ADVISORY HEADLINES APPEAR TO BE
TIMED FINE...SO NO CHANGES THERE.

&&

.FIRE WEATHER...HAVE UPGRADED FIRE WX WATCH TO A WARNING FOR
TODAY FOR PORTIONS OF INTERIOR NE FL...AND HAVE ALSO ADDED ALACHUA
AND BRADFORD. RH VALUES IN SE GA ARE PROGGED TO RANGE FROM 25 TO
30 PERCENT OVER INLAND AREAS AS DRIER AIR MIXES TO THE SFC. AS
DURATIONS AOB 25 PERCENT WILL BE 1 TO 2 HOURS AT BEST AND SFC WINDS
ARE FCST TO REMAIN UNDER 10 KTS...NO HEADLINES ARE EXPECTED IN
SE GA. AS MENTIONED ABOVE...SMOKE PLUMES ARE EXPECTED TO CONTINUE
ADVECTING TO THE SW.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  77  46  79  50 /   0   0   0   0
SSI  70  58  72  61 /   0   0   0   0
JAX  74  52  77  52 /   0   0   0   0
SGJ  73  58  73  60 /  10   0   0   0
GNV  79  51  80  53 /  10   0   0   0
OCF  79  53  81  53 /  10   0   0   0

&&

FL...DENSE SMOKE ADVISORY UNTIL 9 AM THIS MORNING FOR HAMILTON.

     FIRE WEATHER WATCH SUN AFTERNOON FOR ALACHUA-BAKER-BRADFORD-
     COLUMBIA-GILCHRIST-HAMILTON-MARION-SUWANNEE-UNION.

     HIGH SURF ADVISORY UNTIL 1 PM TODAY FOR FLAGLER-ST JOHNS.

     RED FLAG WARNING FROM 1 PM THIS AFTERNOON TO 7 PM THIS
     EVENING FOR ALACHUA-BAKER-BRADFORD-COLUMBIA-GILCHRIST-
     HAMILTON-SUWANNEE-UNION.

GA...DENSE SMOKE ADVISORY UNTIL 9 AM THIS MORNING FOR CLINCH-
     ECHOLS-WARE.

AM...SMALL CRAFT ADVISORY UNTIL 4 PM SUN FOR ALTAMAHA SOUND GA
     TO FLAGLER BEACH FL 20 NM TO 60 NM OFFSHORE.

     SMALL CRAFT ADVISORY UNTIL MIDNIGHT TONIGHT FOR FERNANDINA
     BEACH TO FLAGLER BEACH FL OUT 20 NM.

&&

ZIBURA/CARROLL

Hazardous weather outlook, Apr 20, 8:15 PM EDT, 7 hours 27 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
Apr 21, 5:08 AM EDT	Red Flag Warning	JAX	Baker, Bradford, Gilchrist, Suwannee, Union	14 hr
Apr 21, 2:28 PM EDT	Fire Weather Watch	JAX	Baker, Bradford, Gilchrist, Suwannee, Union	29 hr
Apr 21, 7:12 PM EDT	Red Flag Warning	JAX	Gilchrist, Suwannee	23 hr

Nearby

Coastal Flood Statements in Florida, 2007 Every coastal flood statement in 2007

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.