Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 76, NWS Melbourne, FL

August 3, 2012Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 3, 2012, 2:40 PM EDT for Orange County, Seminole County, Florida. It was in force for 13 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 3, 2012, 2:40 PM EDT (18:40 UTC)
Expired: Aug 3, 2012, 2:53 PM EDT
In force: 13 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Orange County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 106 km from the middle of the area, began a volume at 18:42 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.

What was reported inside it

Time	Report	Where	Remark
Aug 3, 2:40 PM EDT	HAIL 0.7	3 Nne Altamonte Springs, FL	SPOTTER REPORTED DIME-SIZED HAIL ON I-4 NEAR LAKE MARY.
Aug 3, 2:40 PM EDT	HAIL 0.75	5 Ne Altamonte Springs, FL	SPOTTER REPORTED PENNY-SIZED HAIL NEAR LONGWOOD.
Aug 3, 2:43 PM EDT	HAIL 0.88	2 Nne Altamonte Springs, FL	SPOTTER REPORTED NICKEL-SIZED HAIL AT I-4 AND SR 434.
Aug 3, 2:50 PM EDT	HAIL 0.88	4 Ne Altamonte Springs, FL	SPOTTER REPORTED NICKEL SIZED HAIL ON SANDALWOOD WAY IN LONGWOOD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 6.7 hours before the alert went out and 97 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: 1248 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1135 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: -27 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.

917 
WUUS52 KMLB 031840
SVRMLB
FLC095-117-031930-
/O.NEW.KMLB.SV.W.0076.120803T1840Z-120803T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
240 PM EDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTH CENTRAL ORANGE COUNTY IN FLORIDA
  NORTHWESTERN SEMINOLE COUNTY IN FLORIDA

* UNTIL 330 PM EDT.

* AT 237 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
  LONGWOOD...AND MOVING NORTHWEST AT 5 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 2879 8154 2879 8152 2879 8143 2878 8142
      2882 8142 2884 8133 2870 8132 2868 8139
TIME...MOT...LOC 1840Z 127DEG 3KT 2872 8138

$$



BRAGAW

1 follow-up statement

097 
WWUS52 KMLB 031853
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
253 PM EDT FRI AUG 3 2012

FLC095-117-031902-
/O.CAN.KMLB.SV.W.0076.000000T0000Z-120803T1930Z/
SEMINOLE-ORANGE-
253 PM EDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTH CENTRAL ORANGE
AND NORTHWESTERN SEMINOLE COUNTIES IS CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD MOVED SOUTHEAST OF 
THE IMMEDIATE AREA AND IS NOW AFFECTING AREAS SOUTH OF 
LONGWOOD...INCLUDING ALTAMONTE SPRINGS AND FERN PARK.

LAT...LON 2879 8154 2879 8152 2879 8143 2878 8142
      2882 8142 2884 8133 2870 8132 2868 8139
TIME...MOT...LOC 1852Z 127DEG 3KT 2873 8139

$$



BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 2:24 PM EDT	Special Weather Statement	MLB	Lake, Orange, Seminole	66 min
Aug 3, 2:50 PM EDT	Severe Thunderstorm Warning	MLB	Seminole	40 min
Aug 3, 3:25 PM EDT	Areal Flood Advisory	MLB	Seminole	95 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.