Alert archive / Florida / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 15, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 20, 2012, 5:39 PM EDT for Indian River County, Saint Lucie County, Florida. It was in force for 66 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
- Apr 20, 2012, 5:39 PM EDT (21:39 UTC)
- Expired
- Apr 20, 2012, 6:45 PM EDT
- In force
- 66 min
- Issued by
- NWS Melbourne, FL
- Area
- Storm-based polygon
The radar
The Melbourne radar (KMLB), 80 km from the middle of the area, began a volume at 21:38 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, 9.7 hours before the alert went out and 115 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
- 414 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 861 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
037
WUUS52 KMLB 202139
SVRMLB
FLC061-111-202245-
/O.NEW.KMLB.SV.W.0015.120420T2139Z-120420T2245Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
539 PM EDT FRI APR 20 2012
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN INDIAN RIVER COUNTY IN FLORIDA
NORTHERN ST. LUCIE COUNTY IN FLORIDA
* UNTIL 645 PM EDT.
* AT 533 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
VERO BEACH HIGHLANDS...OR NEAR INDRIO...AND MOVING SOUTHEAST AT 10
MPH.
OTHER STRONG STORMS...POSSIBLY BECOMING SEVERE...WERE FORMING IN
NORTH-CENTRAL AND NORTHWEST SAINT LUCIE COUNTY.
* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
SOUTH BEACH...SAINT LUCIE VILLAGE...QUEENS COVE...FORT PIERCE...
WHITE CITY...FORT PIERCE INLET...INDIAN RIVER ESTATES AND SAINT
LUCIE NUCLEAR PLANT
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR AND OR LARGE DESTRUCTIVE HAIL. FREQUENT TO EXCESSIVE LIGHTNING
AND VERY HEAVY RAIN WILL ALSO BE POSSIBLE. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 2734 8023 2735 8027 2739 8027 2745 8031
2736 8027 2740 8066 2743 8068 2755 8061
2763 8035 2759 8031 2755 8031
TIME...MOT...LOC 2138Z 289DEG 8KT 2756 8035
$$
SEDLOCK2 follow-up statements
060
WWUS52 KMLB 202211
SVSMLB
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
611 PM EDT FRI APR 20 2012
FLC061-202218-
/O.CAN.KMLB.SV.W.0015.000000T0000Z-120420T2245Z/
INDIAN RIVER-
611 PM EDT FRI APR 20 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN INDIAN RIVER
COUNTY IS CANCELLED...
LAT...LON 2735 8027 2739 8027 2745 8031 2742 8031
2737 8028 2736 8028 2740 8066 2744 8068
2755 8061 2756 8031 2734 8023
TIME...MOT...LOC 2208Z 293DEG 10KT 2750 8028
$$
FLC111-202245-
/O.CON.KMLB.SV.W.0015.000000T0000Z-120420T2245Z/
ST. LUCIE-
611 PM EDT FRI APR 20 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHERN ST. LUCIE COUNTY...
AT 603 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR PEPPER BEACH PARK...OR NEAR FORT PIERCE INLET...MOVING
SOUTHEAST AT 10 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FORT
PIERCE OCEAN PARK...SURFSIDE PARK...COLLINS PARK ESTATES...INDIAN
RIVER ESTATES...FREDERICK DOUGLASS PARK AND SAINT LUCIE NUCLEAR PLANT
OTHER STRONG STORMS WERE ALSO ACROSS NORTH-CENTRAL AND WESTERN
OSCEOLA COUNTY. THESE STRENGTHENING CELLS...TOO...CONTAIN TORRENTIAL
RAINFALL...SMALL HAIL...GUSTY WINDS AND FREQUENT CLOUD TO GROUND
LIGHTNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 2735 8027 2739 8027 2745 8031 2742 8031
2737 8028 2736 8028 2740 8066 2744 8068
2755 8061 2756 8031 2734 8023
TIME...MOT...LOC 2208Z 293DEG 10KT 2750 8028
$$
SEDLOCK797
WWUS52 KMLB 202241
SVSMLB
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
641 PM EDT FRI APR 20 2012
FLC111-202249-
/O.EXP.KMLB.SV.W.0015.000000T0000Z-120420T2245Z/
ST. LUCIE-
641 PM EDT FRI APR 20 2012
...THE SEVERE THUNDERSTORM WARNING FOR ST. LUCIE COUNTY WILL BE
ALLOWED TO EXPIRE AT 645 PM EDT...
THE SEVERE STORM THAT PROMPTED THE WARNING HAD MOVED OFF THE EAST
COAST...WHILE OTHER STRONG STORMS ARE STILL ONGOING OVER CENTRAL AND
SOUTHERN SAINT LUCIE COUNTY.
STRONG GUSTY WINDS 40 TO 50 MPH...SMALL COIN SIZE HAIL...TORRENTIAL
RAINS AND FREQUENT LIGHTNING WILL REMAIN POSSIBLE OVER THE NEXT HOUR.
LAT...LON 2735 8027 2739 8027 2745 8031 2742 8031
2737 8028 2736 8028 2740 8066 2744 8068
2755 8061 2756 8031 2734 8023
TIME...MOT...LOC 2239Z 293DEG 10KT 2747 8019
$$
SEDLOCKThe office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 3:06 PM EDT | Severe Thunderstorm Warning | MLB | Lake, Orange | 38 min |
| Apr 20, 3:56 PM EDT | Special Weather Statement | MLB | Lake, Orange, Osceola, Seminole | 64 min |
| Apr 20, 4:08 PM EDT | Severe Thunderstorm Warning | MLB | Indian River | 67 min |
| Apr 20, 4:09 PM EDT | Severe Thunderstorm Warning | MLB | Orange, Osceola | 66 min |
| Apr 20, 4:15 PM EDT | Special Marine Warning | MLB | 2 hr | |
| Apr 20, 4:19 PM EDT | Special Weather Statement | MLB | Martin | 41 min |
| Apr 20, 4:22 PM EDT | Severe Thunderstorm Warning | MLB | Osceola | 53 min |
| Apr 20, 4:29 PM EDT | Special Weather Statement | MLB | Volusia | 61 min |
| Apr 20, 4:35 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 55 min |
| Apr 20, 4:43 PM EDT | Severe Thunderstorm Warning | MLB | Okeechobee | 62 min |
| Apr 20, 5:04 PM EDT | Severe Thunderstorm Warning | MLB | Lake, Volusia | 56 min |
| Apr 20, 5:20 PM EDT | Special Weather Statement | MLB | Indian River | 40 min |
| Apr 20, 5:34 PM EDT | Special Marine Warning | MLB | 116 min | |
| Apr 20, 5:34 PM EDT | Severe Thunderstorm Warning | MLB | Brevard, Osceola | 56 min |
| Apr 20, 5:59 PM EDT | Special Marine Warning | MLB | 2 hr | |
| Apr 20, 6:36 PM EDT | Severe Thunderstorm Warning | MLB | Brevard, Orange, Seminole, Volusia | 54 min |
| Apr 20, 6:49 PM EDT | Special Weather Statement | MLB | Martin | 56 min |
| Apr 20, 7:37 PM EDT | Special Weather Statement | MLB | Brevard | 53 min |
| Apr 20, 7:49 PM EDT | Special Marine Warning | MLB | 41 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2012Every severe thunderstorm warning in 2012
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.