Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 77, NWS Melbourne, FL

August 3, 2012Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 3, 2012, 2:50 PM EDT for Seminole County, Florida. It was in force for 40 min. 1 report 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, 2:50 PM EDT (18:50 UTC)
Expired: Aug 3, 2012, 3:30 PM EDT
In force: 40 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Seminole County, FL

The radar

The Melbourne radar (KMLB), 97 km from the middle of the area, began a volume at 18:52 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, 2:50 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, 6.8 hours before the alert went out and 90 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.

978 
WUUS52 KMLB 031850
SVRMLB
FLC117-031930-
/O.NEW.KMLB.SV.W.0077.120803T1850Z-120803T1930Z/

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

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN SEMINOLE COUNTY IN FLORIDA

* UNTIL 330 PM EDT.

* AT 247 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
  CASSELBERRY...AND MOVING SOUTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  WINTER SPRINGS...LAKE JESSUP AND GOLDENROD

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 2871 8145 2874 8142 2879 8141 2885 8137
      2878 8118 2861 8129 2862 8133 2864 8133
      2864 8142 2865 8146 2871 8146
TIME...MOT...LOC 1849Z 307DEG 6KT 2868 8131

$$



BRAGAW

2 follow-up statements

557 
WWUS52 KMLB 031903
SVSMLB

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

FLC117-031930-
/O.CON.KMLB.SV.W.0077.000000T0000Z-120803T1930Z/
SEMINOLE-
303 PM EDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR WESTERN SEMINOLE COUNTY...

AT 256 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A DIME AND NICKEL 
SIZED HAIL IN WEST SEMINOLE COUNTY NEAR THE INTERSECTION OF I-4 AND 
STATE ROAD 434. RADAR CONTINUED TO INDICATE THE STORM WAS CAPABLE OF 
PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR WINTER SPRINGS...MOVING SOUTHEAST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAKE
JESSUP AND GOLDENROD

LAT...LON 2871 8145 2874 8142 2879 8141 2885 8137
      2878 8118 2861 8129 2862 8133 2864 8133
      2864 8142 2865 8146 2871 8146
TIME...MOT...LOC 1902Z 307DEG 6KT 2867 8129

$$



BRAGAW

147 
WWUS52 KMLB 031926
SVSMLB

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

FLC117-031936-
/O.EXP.KMLB.SV.W.0077.000000T0000Z-120803T1930Z/
SEMINOLE-
326 PM EDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN SEMINOLE COUNTY WILL
EXPIRE AT 330 PM EDT...

AT 323 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
STORM THAT PROMPTED THE WARNING FOR WEST SEMINOLE COUNTY HAS 
WEAKENED BELOW SEVERE LEVELS. HOWEVER...THE STORM WILL CONTINUE TO 
PRODUCE FREQUENT CLOUD-TO-GROUND LIGHTNING AND TORRENTIAL RAIN AS IT 
CONTINUES TO WEAKEN. RADAR RAINFALL ESTIMATES THIS STORM HAS 
PRODUCED BETWEEN TWO TO THREE INCHES OF RAIN OVER WINTER SPRINGS AND 
LONGWOOD.

LAT...LON 2871 8145 2874 8142 2879 8141 2885 8137
      2878 8118 2861 8129 2862 8133 2864 8133
      2864 8142 2865 8146 2871 8146
TIME...MOT...LOC 1926Z 307DEG 6KT 2865 8125

$$



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, 2:40 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	13 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.