Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 48, NWS Melbourne, FL

June 12, 2011Indian River County, Okeechobee County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 12, 2011, 7:30 PM EDT for Indian River County, Okeechobee County, Florida. It was in force for 45 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
Jun 12, 2011, 7:30 PM EDT (23:30 UTC)
Expired
Jun 12, 2011, 8:15 PM EDT
In force
45 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

Counties Indian River County, FL, Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 66 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 108 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 2011-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 104 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 2011-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
104 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
1358 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
14 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.

045 
WUUS52 KMLB 122330
SVRMLB
FLC061-093-130015-
/O.NEW.KMLB.SV.W.0048.110612T2330Z-110613T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
730 PM EDT SUN JUN 12 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN INDIAN RIVER COUNTY IN FLORIDA
  NORTHEASTERN OKEECHOBEE COUNTY IN FLORIDA

* UNTIL 815 PM EDT.

* AT 727 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF FORT
  DRUM...AND MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTIES.

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.

&&

LAT...LON 2748 8101 2778 8066 2756 8066 2756 8068
      2754 8068 2734 8088
TIME...MOT...LOC 2330Z 231DEG 12KT 2746 8086

$$

67
2 follow-up statements
785 
WWUS52 KMLB 130004
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
804 PM EDT SUN JUN 12 2011

FLC061-093-130015-
/O.CON.KMLB.SV.W.0048.000000T0000Z-110613T0015Z/
OKEECHOBEE-INDIAN RIVER-
804 PM EDT SUN JUN 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR WESTERN INDIAN RIVER AND NORTHEASTERN OKEECHOBEE COUNTIES...

AT 802 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR FORT
DRUM...MOVING NORTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTIES.

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.

&&

LAT...LON 2748 8101 2778 8066 2756 8066 2756 8068
      2754 8068 2734 8088
TIME...MOT...LOC 0005Z 231DEG 12KT 2753 8076

$$

67
606 
WWUS52 KMLB 130016
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
816 PM EDT SUN JUN 12 2011

FLC061-093-130025-
/O.EXP.KMLB.SV.W.0048.000000T0000Z-110613T0015Z/
OKEECHOBEE-INDIAN RIVER-
816 PM EDT SUN JUN 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN INDIAN RIVER AND
NORTHEASTERN OKEECHOBEE COUNTIES HAS EXPIRED...

LAT...LON 2748 8101 2778 8066 2756 8066 2756 8068
      2754 8068 2734 8088
TIME...MOT...LOC 0015Z 231DEG 12KT 2755 8073

$$

67

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 3:26 PM EDTSpecial Weather StatementMLBVolusia49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every 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.