Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 66, NWS Melbourne, FL

July 9, 2012Lake County, Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 9, 2012, 3:25 PM EDT for Lake County, Seminole County, Volusia County, Florida. It was in force for 33 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: Jul 9, 2012, 3:25 PM EDT (19:25 UTC)
Expired: Jul 9, 2012, 3:58 PM EDT
In force: 33 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Lake County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 112 km from the middle of the area, began a volume at 19:26 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, 7.4 hours before the alert went out and 98 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: 822 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 59 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.

950 
WUUS52 KMLB 091925
SVRMLB
FLC069-117-127-092030-
/O.NEW.KMLB.SV.W.0066.120709T1925Z-120709T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
325 PM EDT MON JUL 9 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL LAKE COUNTY IN FLORIDA
  NORTHWESTERN SEMINOLE COUNTY IN FLORIDA
  CENTRAL VOLUSIA COUNTY IN FLORIDA

* UNTIL 430 PM EDT.

* AT 321 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
  ORANGE CITY...AND MOVING SOUTHWEST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED       
  TO...LAKE MONROE...DE BARY...DEBARY...BLUE SPRING STATE PARK AND   
  CASSIA

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 2911 8133 2891 8114 2873 8138 2876 8142
      2878 8141 2879 8145 2893 8162
TIME...MOT...LOC 1925Z 051DEG 2KT 2894 8130

$$


MOSES

1 follow-up statement

346 
WWUS52 KMLB 091958
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
358 PM EDT MON JUL 9 2012

FLC069-117-127-092008-
/O.CAN.KMLB.SV.W.0066.000000T0000Z-120709T2030Z/
SEMINOLE-LAKE-VOLUSIA-
358 PM EDT MON JUL 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL VOLUSIA...EAST CENTRAL
LAKE AND NORTHWESTERN SEMINOLE COUNTIES IS CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA...THUS THE WARNING HAS BEEN CANCELLED. HOWEVER 
GUSTY WINDS UP TO 40 MPH AND TORRENTIAL RAINFALL WILL STILL BE 
POSSIBLE OVER THE NEXT HOUR. 

LAT...LON 2911 8133 2891 8114 2873 8138 2876 8142
      2878 8141 2879 8145 2893 8162
TIME...MOT...LOC 1958Z 051DEG 2KT 2893 8132

$$


MOSES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:41 PM EDT	Special Weather Statement	MLB	Volusia	64 min
Jul 9, 3:48 PM EDT	Special Weather Statement	MLB	Lake	42 min
Jul 9, 3:54 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	41 min
Jul 9, 4:31 PM EDT	Areal Flood Advisory	MLB	Lake, Orange, Seminole	89 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.