Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 49, NWS Melbourne, FL

June 12, 2018Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 12, 2018, 5:15 PM EDT for Orange County, Seminole County, Florida. It was in force for 30 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, 2018, 5:15 PM EDT (21:15 UTC)
Expired: Jun 12, 2018, 5:45 PM EDT
In force: 30 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Orange County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 73 km from the middle of the area, began a volume at 21:15 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, 9.3 hours before the alert went out and 67 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: 300 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1084 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

221 
WUUS52 KMLB 122115
SVRMLB
FLC095-117-122145-
/O.NEW.KMLB.SV.W.0049.180612T2115Z-180612T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
515 PM EDT TUE JUN 12 2018

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  South central Seminole County in east central Florida...
  Central Orange County in east central Florida...

* Until 545 PM EDT.

* At 514 PM EDT, a severe thunderstorm was located over Union Park, 
  or near University Of Central Florida. This storm is nearly 
  stationary.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Orlando, Oviedo, Wedgefield, Avalon Park and Bithlo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2864 8109 2849 8109 2849 8130 2864 8130
TIME...MOT...LOC 2114Z 267DEG 10KT 2856 8121 

HAIL...1.00IN
WIND...60MPH
 
$$

Rodriguez

1 follow-up statement

110 
WWUS52 KMLB 122138
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
538 PM EDT TUE JUN 12 2018

FLC095-117-122148-
/O.EXP.KMLB.SV.W.0049.000000T0000Z-180612T2145Z/
Seminole FL-Orange FL-
538 PM EDT TUE JUN 12 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SEMINOLE AND
CENTRAL ORANGE COUNTIES WILL EXPIRE AT 545 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 2864 8109 2849 8109 2849 8130 2864 8130
TIME...MOT...LOC 2138Z 267DEG 10KT 2856 8114 

$$

Rodriguez

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 4:23 PM EDT	Special Weather Statement	MLB	Lake	37 min
Jun 12, 5:04 PM EDT	Special Weather Statement	MLB	Orange	26 min
Jun 12, 5:10 PM EDT	Special Weather Statement	MLB	Seminole	35 min
Jun 12, 5:31 PM EDT	Areal Flood Advisory	MLB	Orange, Seminole, Volusia	119 min
Jun 12, 5:50 PM EDT	Special Weather Statement	MLB	Seminole	25 min
Jun 12, 6:00 PM EDT	Special Weather Statement	MLB	Seminole	30 min
Jun 12, 6:03 PM EDT	Special Marine Warning	MLB		117 min
Jun 12, 6:25 PM EDT	Special Weather Statement	MLB	Osceola	35 min
Jun 12, 6:45 PM EDT	Special Weather Statement	MLB	Osceola	30 min
Jun 12, 7:06 PM EDT	Special Weather Statement	MLB	Osceola	24 min
Jun 12, 7:30 PM EDT	Special Weather Statement	MLB	Osceola	45 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm warning in 2018

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.