Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 27, NWS Melbourne, FL

April 28, 2011Indian River County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 28, 2011, 4:11 PM EDT for Indian River County, Saint Lucie County, Florida. It was in force for 24 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 28, 2011, 4:11 PM EDT (20:11 UTC)
Expired: Apr 28, 2011, 4:35 PM EDT
In force: 24 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Indian River County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 67 km from the middle of the area, began a volume at 20:13 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, 8.2 hours before the alert went out and 102 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: 671 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

434 
WUUS52 KMLB 282011
SVRMLB
FLC061-111-282100-
/O.NEW.KMLB.SV.W.0027.110428T2011Z-110428T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
411 PM EDT THU APR 28 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN INDIAN RIVER COUNTY IN FLORIDA
  NORTH CENTRAL ST. LUCIE COUNTY IN FLORIDA

* UNTIL 500 PM EDT.

* AT 409 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  WEST OF LAKEWOOD PARK...OR 7 MILES SOUTHWEST OF VERO BEACH SOUTH...
  AND MOVING NORTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  SAINT LUCIE VILLAGE...INDRIO...VERO BEACH HIGHLANDS...QUEENS
  COVE...VERO BEACH AND GIFFORD

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 2750 8030 2749 8045 2760 8059 2770 8040
      2762 8036 2760 8037 2756 8035 2755 8034
      2757 8034 2754 8032 2754 8031
TIME...MOT...LOC 2011Z 233DEG 8KT 2755 8049

$$

67

1 follow-up statement

564 
WWUS52 KMLB 282035
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
435 PM EDT THU APR 28 2011

FLC061-111-282045-
/O.CAN.KMLB.SV.W.0027.000000T0000Z-110428T2100Z/
ST. LUCIE-INDIAN RIVER-
435 PM EDT THU APR 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN INDIAN RIVER AND
NORTH CENTRAL ST. LUCIE COUNTIES IS CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A 
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN WILL 
CONTINUE TO BE POSSIBLE.

LAT...LON 2750 8030 2749 8045 2760 8059 2770 8040
      2762 8036 2760 8037 2756 8035 2755 8034
      2757 8034 2754 8032 2754 8031
TIME...MOT...LOC 2035Z 233DEG 8KT 2758 8044

$$

67

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 3:14 PM EDT	Special Weather Statement	MLB	Volusia	46 min
Apr 28, 3:30 PM EDT	Special Marine Warning	MLB		110 min
Apr 28, 5:44 PM EDT	Special Weather Statement	MLB	Okeechobee, Osceola	61 min
Apr 28, 6:18 PM EDT	Special Weather Statement	MLB	Brevard, Indian River	57 min
Apr 28, 6:37 PM EDT	Special Marine Warning	MLB		53 min
Apr 28, 6:48 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	42 min
Apr 28, 6:54 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	51 min
Apr 28, 7:52 PM EDT	Special Weather Statement	MLB	Saint Lucie	38 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011 Every severe thunderstorm warning 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.