Alert archive / Florida / Areal Flood Warnings in 2009

Areal Flood Warning 9, NWS Melbourne, FL

December 17, 2009Saint Lucie County, Florida

NWS Melbourne, FL issued this areal flood warning at Dec 17, 2009, 8:31 PM EST for Saint Lucie County, Florida. It was in force for 104 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 17, 2009, 8:31 PM EST (01:31 UTC)
Expired
Dec 17, 2009, 10:15 PM EST
In force
104 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon
Flood severity
None

County Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 84 km from the middle of the area, began a volume at 01:33 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

Miami, FL (KMFL), launched 00:00Z, 1.5 hours before the alert went out and 174 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-pSkew-T log-p diagram, Miami, FL at 00:00Z on 2009-12-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 653 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 00:00Z on 2009-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
653 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
662 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
66 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 Melbourne, FL wrote its last area forecast discussion before this areal flood warning went out at Dec 17, 2:38 PM EST, 5 hours 53 minutes earlier.

Area forecast discussion, Dec 17, 2:38 PM EST, 5 hours 53 minutes before
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Hazardous weather outlook, Dec 17, 11:00 AM EST, 9 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1100 AM EST THU DEC 17 2009

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-172100-
COASTAL WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE
OUT 20 NM-
COASTAL WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN
INLET OUT 20 NM-
COASTAL WATERS FROM SEBASTIAN INLET TO JUPITER INLET OUT 20 NM-
WATERS FROM FLAGLER BEACH TO VOLUSIA BREVARD COUNTY LINE 20 TO
60 NM OFFSHORE-
WATERS FROM VOLUSIA BREVARD COUNTY LINE TO SEBASTIAN INLET 20 TO
60 NM OFFSHORE-
WATERS FROM SEBASTIAN INLET TO JUPITER INLET 20 TO 60 NM OFFSHORE-
INLAND VOLUSIA-NORTHERN LAKE-ORANGE-SEMINOLE-SOUTHERN BREVARD-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-COASTAL VOLUSIA-
SOUTHERN LAKE-NORTHERN BREVARD-
1100 AM EST THU DEC 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

...RISK FOR ROTATING STORMS TO PRODUCE FUNNEL CLOUDS AND WATERSPOUTS
THIS AFTERNOON AND EARLY EVENING SOUTH OF CAPE CANAVERAL...

...THUNDERSTORM IMPACT...
LATE THIS MORNING...DOPPLER RADARS WERE SHOWING NUMEROUS SHOWERS AND
OCCASIONAL ISOLATED LIGHTNING STORMS OVER AND OFFSHORE COMMUNITIES
FROM SEBASTIAN INLET SOUTH...WITH THE HEAVIEST ACTIVITY OCCURRING OVER
MARTIN AND SAINT LUCIE COUNTIES. RADAR INDICATED THAT THE STRONGER
CELLS WERE EXHIBITING OCCASIONAL WEAK ROTATION. WITH THE BOUNDARY
EXPECTED TO REMAIN NEARLY STATIONARY INTO EARLY EVENING...THE FOCUS
FOR SHOWERS AND STORMS WILL BE PRIMARILY CONFINED TO THE TREASURE
COAST COUNTIES...AS WELL AS AROUND LAKE OKEECHOBEE. THE MORE INTENSE
CELLS WILL REMAIN CAPABLE OF PRODUCING CLOUD TO GROUND LIGHTNING
STRIKES AND FUNNEL CLOUDS. A BRIEF TORNADO TOUCHDOWN CANNOT BE RULED
OUT.

THE THREAT FOR ROTATING STORMS WILL SHIFT SLOWLY NORTHWARD OVERNIGHT
AS A STALLED FRONTAL BOUNDARY NEAR LAKE OKEECHOBEE BEGINS TO PUSH TO
THE NORTH AS A WARM FRONT.

...FLOOD IMPACT...
SHOWERS AND STORMS HAVE ALREADY PRODUCED LOCALLY HEAVY RAINFALL
AMOUNTS IN EXCESS OF ONE INCH ACROSS EASTERN MARTIN COUNTY. LOCAL
PONDING OF WATER WILL REMAIN POSSIBLE...MAINLY ACROSS MARTIN...
OKEECHOBEE...SAINT LUCIE...AND INDIAN RIVER COUNTIES THIS AFTERNOON
...BEFORE SHIFTING GRADUALLY NORTHWARD OVERNIGHT.

RAINFALL IS EXPECTED TO BECOME WIDESPREAD OVER EAST CENTRAL FLORIDA
LATE TONIGHT. VERY HEAVY DOWNPOURS MAY OCCUR ALONG WITH LOCALIZED
FLOODING WHERE RAIN PERSISTS.

...RIP CURRENT IMPACT...
THERE WILL BE AN ELEVATED RISK OF RIP CURRENTS AT EAST CENTRAL FLORIDA
BEACHES TODAY. ALWAYS SWIM NEAR A LIFEGUARD AND NEVER SWIM ALONE.

...MARINE THUNDERSTORM GUST IMPACT...
A FEW STORMS OVER THE INTRACOASTAL WATERWAY AND NEAR SHORE ATLANTIC
WILL BE CAPABLE OF PRODUCING WIND GUSTS OF 35 KNOTS OR GREATER TODAY
AND TONIGHT. THE HIGHEST CHANCES WILL BE SOUTH OF SEBASTIAN INLET
THIS AFTERNOON...THEN SHIFTING GRADUALLY NORTHWARD OVERNIGHT.

...WATERSPOUT IMPACT...
WATERSPOUTS WILL ALSO BE POSSIBLE. AGAIN...THE HIGHEST THREAT WILL
BE ALONG AND OFFSHORE THE TREASURE COAST FROM SEBASTIAN INLET SOUTH
...BEFORE SHIFTING NORTHWARD OVERNIGHT.

...WIND AND SEA IMPACT...
NORTHEAST WINDS OF 20 KNOTS NEAR SHORE AND UP TO 25 KNOTS OFFSHORE
WILL BECOME EAST THEN SOUTHEAST INTO TONIGHT. SEAS WILL BUILD TO
5 TO 7 FEET NEAR SHORE...UP TO 10 FEET OFFSHORE. A SMALL CRAFT
ADVISORY IS IN EFFECT FOR ALL EAST CENTRAL FLORIDA COASTAL WATERS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

...RISK OF STRONG TO SEVERE STORMS ON FRIDAY...

DEVELOPING LOW PRESSURE OVER THE WESTERN GULF OF MEXICO WILL CROSS
NORTH FLORIDA WHILE RAPIDLY STRENGTHENING DURING THE DAY ON FRIDAY.
ABUNDANT DEEP LAYER MOISTURE...ALONG WITH STRONG LOW TO MID LEVEL
WINDS AND AN INCREASINGLY FAVORABLE LOW LEVEL WIND SHEAR PROFILE
WILL INCREASE THE THREAT FOR SEVERE STORMS TO PRODUCE DAMAGING WIND
GUSTS AND TORNADOES DURING THE DAY.

LATEST MODEL GUIDANCE FROM THURSDAY MORNING IS INDICATING THAT THE
LOW IS LIKELY TO BE STRONGER THAN PREVIOUSLY INDICATED.

WHILE THE EXACT TIMING IS STILL A BIT UNCERTAIN...AT THIS TIME IT
APPEARS THAT A PRE-FRONTAL SQUALL LINE WILL REACH LAKE COUNTY
SOMETIME AROUND MID MORNING...THEN SHIFT RAPIDLY EASTWARD ACROSS
ORANGE...OSCEOLA...SEMINOLE AND VOLUSIA COUNTIES FROM LATE MORNING
TO EARLY AFTERNOON. THE SQUALL LINE WILL THEN PUSH ACROSS OKEECHOBEE
...BREVARD...INDIAN RIVER...SAINT LUCIE AND MARTIN COUNTIES DURING
THE AFTERNOON.

PERSONS SHOULD REMAIN AWARE OF THE POTENTIAL FOR SEVERE WEATHER
TONIGHT INTO FRIDAY. MONITOR NOAA WEATHER RADIO AND YOUR LOCAL MEDIA
OUTLETS FOR POTENTIAL WATCHES...WARNINGS...AND STATEMENTS...AS WELL
AS YOUR LOCAL FORECAST.

IF YOU OWN A WEATHER RADIO...NOW IS THE TIME TO MAKE SURE THAT IT
IS IN GOOD WORKING ORDER...CORRECTLY PROGRAMMED...AND HAS A FRESH
BATTERY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO MONITOR THE WEATHER AND SELF ACTIVATE IF
NEEDED LATE TONIGHT. SPOTTER ACTIVATION APPEARS LIKELY BY SOMETIME
EARLY FRIDAY MORNING.

GLITTO/CRISTALDI

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 18, 4:28 AM ESTTornado WarningMLBBrevard, Indian River33 min
Dec 18, 4:32 AM ESTGale WarningMLB23 hr
Dec 18, 4:32 AM ESTSmall Craft AdvisoryMLB71 hr
Dec 18, 4:35 AM ESTLake Wind AdvisoryMLBLake, Okeechobee, Orange, Osceola, Seminole, Volusia13 hr
Dec 18, 5:00 AM ESTSpecial Marine WarningMLB2 hr
Dec 18, 5:37 AM ESTTornado WarningMLBBrevard24 min
Dec 18, 6:58 AM ESTSpecial Marine WarningMLB2 hr
Dec 18, 7:47 AM ESTSpecial Marine WarningMLB118 min
Dec 18, 8:56 AM ESTSpecial Marine WarningMLB2 hr
Dec 18, 9:41 AM ESTSpecial Marine WarningMLB2 hr
Dec 18, 5:12 PM ESTTornado WarningMLBOsceola48 min
Dec 18, 6:11 PM ESTSpecial Marine WarningMLB79 min

Nearby

Areal Flood Warnings in Florida, 2009Every areal flood warning in 2009

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.