Alert archive / Florida / Special Weather Statements in 2011

Special Weather Statement, NWS Melbourne, FL

August 23, 2011Orange County, Florida

NWS Melbourne, FL issued this special weather statement at Aug 23, 2011, 2:35 PM EDT for Orange County, Florida. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 23, 2011, 2:35 PM EDT (18:35 UTC)
Expired
Aug 23, 2011, 3:30 PM EDT
In force
55 min
Issued by
NWS Melbourne, FL

County Orange County, FL

The radar

The Melbourne radar (KMLB), 120 km from the middle of the area, began a volume at 18:36 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 6.6 hours before the alert went out and 110 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, Cape Canaveral, FL at 12:00Z on 2011-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 165 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, Cape Canaveral, FL at 12:00Z on 2011-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
165 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1320 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
6 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 23, 9:00 AM EDT, 5 hours 35 minutes earlier.

Area forecast discussion, Aug 23, 9:00 AM EDT, 5 hours 35 minutes before
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Hazardous weather outlook, Aug 23, 9:47 AM EDT, 4 hours 48 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
947 AM EDT TUE AUG 23 2011

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-231900-
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-
947 AM EDT TUE AUG 23 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
A WEAK SURFACE TROUGH SETTLING INTO NORTHEAST FLORIDA SHOULD
ENHANCE MOISTURE CONVERGENCE NEAR AND NORTHWEST OF INTERSTATE 4
TODAY. SCATTERED SLOW MOVING STORMS ARE EXPECTED DURING THE
AFTERNOON AS BOUNDARY INTERACTIONS OCCUR.

SLIGHTLY LOWER MOISTURE IS FORECAST SOUTHWARD TO OKEECHOBEE AND
THE TREASURE COAST...BUT SCATTERED STORMS ARE STILL EXPECTED
ALONG THE INLAND MOVING SEA BREEZE BOUNDARY.

THE MAIN HAZARD WILL BE FREQUENT LIGHTNING STRIKES AND WIND GUSTS
UP TO 40 MPH IN ISOLATED STRONG STORMS.

.FLOOD IMPACT...
SLOW STORM MOTION WILL RESULT IN LOCAL 2 TO 3 INCH
DOWNPOURS...LEADING TO PONDING OF WATER ON LOCAL ROADWAYS AND
OTHER POORLY DRAINED AREAS. THESE PROBLEMS WILL BE AGGRAVATED IN
AREAS THAT HAVE RECEIVED HEAVY RAINFALL OVER THE THE PAST FEW
DAYS.

.MARINE THUNDERSTORM GUST IMPACT...
ISOLATED ATLANTIC STORMS OVER THE GULF STREAM THIS MORNING WILL
DIMINISH AS THE EAST COAST SEA BREEZE DEVELOPS. THE GREATEST
COVERAGE OF AFTERNOON STORMS WILL OCCUR NEAR AND NORTHWEST OF
INTERSTATE 4 AS NUMEROUS BOUNDARIES INTERACT DURING THE AFTERNOON.
STORM MOTION WILL BE SLOW...WITH POSSIBLY A SLIGHT SOUTHWARD
DRIFT. FREQUENT LIGHTNING STRIKES AND GUSTY WINDS 30 TO 35 KNOTS
WILL OCCUR WITH ISOLATED STRONG STORMS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
INCREASING ONSHORE FLOW AND SWELLS WILL OCCUR LATE WEDNESDAY AS
HURRICANE IRENE MOVES THROUGH THE CENTRAL BAHAMAS. THIS WILL LEAD
TO DETERIORATING BOATING CONDITIONS AND AN INCREASED RIP CURRENT
RISK.

IRENE IS FORECAST TO BE A LARGE AND POWERFUL CATEGORY 4 HURRICANE
AS IT PASSES ABOUT 150 MILES EAST OF THE COAST ON THURSDAY. THIS
WOULD PRODUCE HURRICANE CONDITIONS OVER PORTIONS OF THE COASTAL
WATERS AND TROPICAL STORM FORCE WIND GUSTS OVER MUCH OF EAST
CENTRAL FLORIDA. SIGNIFICANT BEACH EROSION AND DANGEROUS SURF WILL
OCCUR AS IRENE PASSES TO OUR EAST.

THOUGH THE CURRENT TRACK KEEPS THE CENTER OF IRENE WELL
OFFSHORE...YOU SHOULD STILL REMAIN AWARE OF THIS LARGE HURRICANE
AND BE PREPARED FOR TROPICAL STORM CONDITIONS STARTING LATE
THURSDAY AFTERNOON THROUGH FRIDAY AFTERNOON. .

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

LASCODY/MOSES

In the hours before

Special weather statement, Aug 23, 1:03 PM EDT, 1 hour 32 minutes before
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Local storm report, Aug 23, 1:36 PM EDT, 59 minutes before
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Special weather statement, Aug 23, 2:26 PM EDT, 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
226 PM EDT TUE AUG 23 2011

FLZ054-231930-
INDIAN RIVER-
226 PM EDT TUE AUG 23 2011

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH OVER CENTRAL INDIAN RIVER COUNTY...

* UNTIL 330 PM EDT.

AT 222 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STORM CAPABLE OF PRODUCING STRONG WIND GUSTS OVER FELLSMERE...MOVING
SOUTH AT 15 MPH.

THE PRIMARY THREAT WILL BE CLOUD TO GROUND LIGHTNING STRIKES AND
GUSTY WINDS OF 45 TO 55 MPH...WHICH CAN CAUSE UNSECURED OBJECTS TO
BLOW AROUND...SNAP TREE LIMBS OR CAUSE POWER OUTAGES. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

LAT...LON 2757 8047 2756 8075 2782 8084 2782 8056
TIME...MOT...LOC 1827Z 346DEG 12KT 2772 8066

KELLY
Special weather statement, Aug 23, 2:35 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
235 PM EDT TUE AUG 23 2011

FLZ041-044>046-053-231930-
INLAND VOLUSIA COUNTY-NORTHERN LAKE COUNTY-ORANGE-OSCEOLA-SEMINOLE-
235 PM EDT TUE AUG 23 2011

...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS
BETWEEN 45 AND 55 MPH AND SMALL HAIL OVER NORTHEASTERN LAKE COUNTY...
CENTRAL ORANGE COUNTY...NORTHERN OSCEOLA COUNTY...SEMINOLE COUNTY...
WESTERN VOLUSIA COUNTY...

* UNTIL 330 PM EDT.

A STRONG OUTFLOW BOUNDARY MOVING THROUGH THE AREA WILL PRODUCE WINDS
OF UP TO 50 MPH AS IT MOVES WESTWARDS THROUGH THE ORLANDO
METRO...WESTERN LAKE AND NORTHERN LAKE COUNTY. ADDITIONAL STRONG
STORMS WILL DEVELOP ALONG AND JUST BEHIND THIS LINE AS IT MOVES
THROUGH. INDIVIDUAL STORMS WILL MOVE TO THE SOUTH AT 5 TO 10 MPH.

THE PRIMARY THREAT WILL BE FREQUENT CLOUD TO GROUND LIGHTNING
STRIKES...SMALL HAIL...AND GUSTY WINDS UP TO 50 MPH...WHICH CAN
CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE LIMBS OR CAUSE
POWER OUTAGES. HEAVY RAINFALL WILL TEMPORARILY REDUCE VISIBILITY.
SEEK SHELTER INDOORS UNTIL THE STORM PASSES.

LAT...LON 2897 8166 2905 8166 2905 8165 2905 8164
      2908 8164 2915 8127 2820 8101 2815 8146
      2896 8167
TIME...MOT...LOC 1832Z 357DEG 8KT 2846 8119

MOSES

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 12:46 PM EDTSpecial Marine WarningMLB119 min
Aug 23, 1:03 PM EDTSpecial Weather StatementMLBBrevard87 min
Aug 23, 2:19 PM EDTSevere Thunderstorm WarningMLBBrevard41 min
Aug 23, 2:26 PM EDTSpecial Weather StatementMLBIndian River64 min
Aug 23, 2:27 PM EDTAreal Flood AdvisoryMLBBrevard2 hr
Aug 23, 3:11 PM EDTSevere Thunderstorm WarningMLBLake, Orange, Seminole, Volusia38 min
Aug 23, 3:21 PM EDTSpecial Weather StatementMLBMartin, Okeechobee54 min
Aug 23, 3:27 PM EDTSpecial Weather StatementMLBBrevard48 min
Aug 23, 3:42 PM EDTAreal Flood AdvisoryMLBLake2 hr
Aug 23, 3:57 PM EDTAreal Flood AdvisoryMLBMartin93 min
Aug 23, 4:03 PM EDTSpecial Weather StatementMLBLake57 min
Aug 23, 4:30 PM EDTSpecial Weather StatementMLBLake45 min
Aug 23, 4:38 PM EDTSpecial Weather StatementMLBOkeechobee52 min
Aug 23, 5:06 PM EDTTropical Storm WatchMLB39 hr
Aug 23, 6:29 PM EDTHurricane Local StatementMLBVolusia68 hr

Nearby

Special Weather Statements in Florida, 2011Every special weather statement in 2011

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.