Alert archive / Florida / Special Weather Statements in 2011
Special Weather Statement, NWS Melbourne, FL
NWS Melbourne, FL issued this special weather statement at Aug 20, 2011, 2:33 PM EDT for Saint Lucie County, Florida. It was in force for 42 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 20, 2011, 2:33 PM EDT (18:33 UTC)
- Expired
- Aug 20, 2011, 3:15 PM EDT
- In force
- 42 min
- Issued by
- NWS Melbourne, FL
County Saint Lucie County, FL
The radar
The Melbourne radar (KMLB), 83 km from the middle of the area, began a volume at 18:33 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 6.6 hours before the alert went out and 122 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.
- Mixed-layer CAPE
- 719 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 945 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
843 WWUS82 KMLB 201833 SPSMLB SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MELBOURNE FL 233 PM EDT SAT AUG 20 2011 FLZ059-201915- ST. LUCIE- 233 PM EDT SAT AUG 20 2011 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS BETWEEN 45 AND 55 MPH OVER ST. LUCIE COUNTY... * UNTIL 315 PM EDT. AT 228 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STORM CAPABLE OF PRODUCING STRONG WIND GUSTS OVER SAINT LUCIE WEST... MOVING NORTHWEST AT 15 MPH. THE PRIMARY THREAT WILL BE FREQUENT 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. TORRENTIAL RAINS ARE ALSO ASSOCIATED WITH THESE STORMS AND CAN RESULT IN LOCAL PONDING OF WATER ON ROADWAYS IN A SHORT AMOUNT OF TIME. LAT...LON 2743 8067 2755 8056 2724 8030 2722 8049 TIME...MOT...LOC 1832Z 149DEG 11KT 2735 8047 $$ SEDLOCK
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 20, 9:17 AM EDT, 5 hours 16 minutes earlier.
Area forecast discussion, Aug 20, 9:17 AM EDT, 5 hours 16 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 917 AM EDT SAT AUG 20 2011 .DISCUSSION... ANTICIPATING AN EARLY START TO SOME COASTAL SHOWERS ONCE THE EAST COAST BREEZE BOUNDARY BEGINS TO DEVELOP LATE THIS MORNING. STRONG SB HEATING COMBINED WITH PWAT JUST OVER 2 INCHES AND SLY ENVIRONMENTAL FLOW WILL LEAD TO THE DEVELOPMENT OF DEEP CONVECTION WITH THREAT OF LOCALLY HEAVY RAINS AND FREQUENT LIGHTNING. LIGHT SLY STEERING LEVEL WINDS WILL NUDGE STORMS SLOWLY NORTHWARD AND ACTIVITY WILL STEADILY TRANSITION WEST OF I95 INLAND DURING THE COURSE OF THE AFTERNOON WHERE AN EVENTUAL LARGE SCALE BOUNDARY MERGER OVER THE INTERIOR COUNTIES ALONG WITH OUTFLOW INTERACTIONS WILL INCREASE LIKELIHOOD OF NUISANCE FLOODING AND THE POSSIBILITY OF STRONGER STORMS CONTAINING FREQUENT TO EXCESSIVE LIGHTNING AFTER AROUND 3 PM FROM THE THEME PARKS TO ORLANDO AND SANFORD. WITH MORE FAVORABLE PARAMETERS FOR DEEP CONVECTION IN PLACE WL SLIGHTLY INCREASE POPS OVER THE SOUTH AND INTERIOR WITH LOCALLY HEAVY RAIN WORDING INLAND AS WELL ON FCST UPDATE. && .AVIATION... SEA BREEZE SHOWERS/STORMS SHOULD DEVELOP NEAR THE COAST ALONG ECSB BOUNDARY AROUND 15-17Z. ACTIVITY WILL PROPAGATE INLAND WITH INTERIOR TERMINALS HAVING A CHANCE FOR STORMS ABOUT 20-24Z. && .MARINE... TODAY/TONIGHT...(PREVIOUS) ATLANTIC RIDGE AXIS IS TRANSITIONING NORTH WHICH WILL CAUSE WINDS TO GRADUALLY BACK FROM THE SOUTH TO THE SOUTHEAST. SPEEDS SHOULD BE 10 KNOTS OR LESS EXCEPT FOR A DIURNAL EVENING INCREASE TO 10-15 KNOTS. MOISTURE WILL BE HIGH TODAY SO EXPECT A CHANCE OF SHOWERS/STORMS...ESPECIALLY THIS MORNING. MODELS SHOW SLIGHTLY DRIER AIR FILTERING IN FROM THE SOUTHEAST TONIGHT. && .MLB WATCHES/WARNINGS/ADVISORIES... FL...NONE. AM...NONE. && PUBLIC/MARINE/AVIATION...JP RADAR/IMPACT WEATHER...TES/JG
Hazardous weather outlook, Aug 20, 11:30 AM EDT, 3 hours 3 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MELBOURNE FL 1130 AM EDT SAT AUG 20 2011 AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141- 144-147-201600- 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- 1130 AM EDT SAT AUG 20 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA. .DAY ONE...THIS AFTERNOON AND TONIGHT. .THUNDERSTORM IMPACT... A MOIST AIR MASS WILL REMAIN ACROSS THE AREA. SEA BREEZE STORMS ARE EXPECTED TO DEVELOP THROUGH EARLY AFTERNOON NEAR THE COAST...THEN INCREASE IN COVERAGE AND INTENSITY BY LATE AFTERNOON ACROSS THE INTERIOR AS NUMEROUS BOUNDARY INTERACTIONS OCCUR. THE PRIMARY HAZARD WILL BE LIGHTNING STRIKES...WHICH WILL BE FREQUENT IN ISOLATED STRONG STORMS. .FLOOD IMPACT... RAINFALL AMOUNTS IN ISOLATED...SLOW MOVING STRONG STORMS THIS AFTERNOON WILL REACH NEAR 3 INCHES AGAIN. THIS WILL PRODUCE WATER PONDING ON ROADWAYS AND OTHER POORLY DRAINED AREAS. .MARINE THUNDERSTORM GUST IMPACT... SCATTERED SHOWERS AND STORMS WILL CONTINUE TO MOVE NORTH AROUND 10 MPH THIS AFTERNOON OVER THE COASTAL WATERS. OCCASIONAL LIGHTNING STRIKES AND WIND GUSTS TO 25 KNOTS ARE EXPECTED. STORMS OVER THE MAINLAND WILL MOVE NORTH AT 5 TO 10 MPH AND FAVOR COASTAL COUNTIES EARLY THIS AFTERNOON AND INTERIOR COUNTIES LATER IN THE DAY. ISOLATED STRONG STORMS WITH FREQUENT LIGHTNING STRIKES AND WIND GUSTS AROUND 30 KNOTS ARE POSSIBLE ACROSS THE INTERIOR. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. A SOUTHEAST TO EAST WIND FLOW INTO THE MIDDLE OF NEXT WEEK WILL FAVOR INTERIOR AREAS FOR AFTERNOON THUNDERSTORMS. AN INCREASING EASTERLY SWELL WEDNESDAY INTO THURSDAY NEXT WEEK WILL HEIGHTEN THE RIP CURRENT RISK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. SEDLOCK/LASCODY
In the hours before
Special weather statement, Aug 20, 2:33 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MELBOURNE FL 233 PM EDT SAT AUG 20 2011 FLZ059-201915- ST. LUCIE- 233 PM EDT SAT AUG 20 2011 ...A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT FOR STRONG WIND GUSTS BETWEEN 45 AND 55 MPH OVER ST. LUCIE COUNTY... * UNTIL 315 PM EDT. AT 228 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STORM CAPABLE OF PRODUCING STRONG WIND GUSTS OVER SAINT LUCIE WEST... MOVING NORTHWEST AT 15 MPH. THE PRIMARY THREAT WILL BE FREQUENT 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. TORRENTIAL RAINS ARE ALSO ASSOCIATED WITH THESE STORMS AND CAN RESULT IN LOCAL PONDING OF WATER ON ROADWAYS IN A SHORT AMOUNT OF TIME. LAT...LON 2743 8067 2755 8056 2724 8030 2722 8049 TIME...MOT...LOC 1832Z 149DEG 11KT 2735 8047 SEDLOCK
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:36 PM EDT | Special Weather Statement | MLB | Lake, Orange, Osceola | 39 min |
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.