Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 4, NWS Melbourne, FL

March 20, 2018Lake County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 20, 2018, 2:24 PM EDT for Lake County, Florida. It was in force for 36 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: Mar 20, 2018, 2:24 PM EDT (18:24 UTC)
Expired: Mar 20, 2018, 3:00 PM EDT
In force: 36 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Lake County, FL

The radar

The Tampa radar (KTBW), 113 km from the middle of the area, began a volume at 18:29 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 20, 10:24 AM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 6.4 hours before the alert went out and 113 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: 1099 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

As transmitted.

238 
WUUS52 KMLB 201824
SVRMLB
FLC069-201900-
/O.NEW.KMLB.SV.W.0004.180320T1824Z-180320T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
224 PM EDT TUE MAR 20 2018

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Southwestern Lake County in east central Florida...

* Until 300 PM EDT

* At 224 PM EDT, a severe thunderstorm was located over Mascotte,
  moving northeast at 45 mph.

  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...
  Groveland, Mascotte, Howey-In-the-hills, Ferndale and Clermont. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 700 PM EDT for east central
Florida.

LAT...LON 2868 8195 2877 8166 2857 8165 2844 8195
      2846 8196
TIME...MOT...LOC 1824Z 242DEG 41KT 2856 8194 

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

Combs

1 follow-up statement

183 
WWUS52 KMLB 201858
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
258 PM EDT TUE MAR 20 2018

FLC069-201908-
/O.EXP.KMLB.SV.W.0004.000000T0000Z-180320T1900Z/
Lake FL-
258 PM EDT TUE MAR 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAKE COUNTY WILL
EXPIRE AT 300 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 heavy rain
is still possible with this thunderstorm.

A tornado watch remains in effect until 700 PM EDT for east central
Florida.

LAT...LON 2868 8195 2877 8166 2857 8165 2844 8195
      2846 8196
TIME...MOT...LOC 1858Z 242DEG 41KT 2873 8157 

$$

Combs

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 3:13 AM EDT	Lake Wind Advisory	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	17 hr
Mar 20, 3:17 AM EDT	Gale Warning	MLB		31 hr
Mar 20, 9:19 AM EDT	Special Weather Statement	MLB	Volusia	56 min
Mar 20, 9:30 AM EDT	Severe Thunderstorm Warning	MLB	Volusia	45 min
Mar 20, 9:39 AM EDT	Tornado Warning	MLB	Volusia	51 min
Mar 20, 10:31 AM EDT	Severe Thunderstorm Warning	MLB	Volusia	29 min
Mar 20, 10:33 AM EDT	Special Marine Warning	MLB		42 min
Mar 20, 1:39 PM EDT	Severe Thunderstorm Warning	MLB	Lake	36 min
Mar 20, 1:57 PM EDT	Tornado Warning	MLB	Lake, Orange	33 min
Mar 20, 2:17 PM EDT	Special Weather Statement	MLB	Lake, Orange, Seminole, Volusia	58 min
Mar 20, 2:26 PM EDT	Tornado Warning	MLB	Orange, Seminole	34 min
Mar 20, 2:32 PM EDT	Tornado Warning	MLB	Lake	18 min
Mar 20, 2:48 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	27 min
Mar 20, 3:03 PM EDT	Severe Thunderstorm Warning	MLB	Orange	27 min
Mar 20, 3:09 PM EDT	Special Marine Warning	MLB		111 min
Mar 20, 3:18 PM EDT	Severe Thunderstorm Warning	MLB	Orange	27 min
Mar 20, 3:20 PM EDT	Special Weather Statement	MLB	Lake, Orange, Seminole, Volusia	55 min
Mar 20, 3:42 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	48 min
Mar 20, 4:14 PM EDT	Special Weather Statement	MLB	Volusia	61 min
Mar 20, 4:50 PM EDT	Special Weather Statement	MLB	Lake, Orange	55 min
Mar 20, 5:05 PM EDT	Special Weather Statement	MLB	Indian River, Okeechobee, Osceola, Saint Lucie	85 min
Mar 20, 5:20 PM EDT	Special Marine Warning	MLB		115 min
Mar 20, 5:25 PM EDT	Tornado Warning	MLB	Okeechobee	35 min
Mar 20, 5:26 PM EDT	Special Weather Statement	MLB	Volusia	49 min
Mar 20, 5:32 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	28 min
Mar 20, 5:38 PM EDT	Special Marine Warning	MLB		2 hr
Mar 20, 5:56 PM EDT	Severe Thunderstorm Warning	MLB	Indian River, Okeechobee, Saint Lucie	34 min
Mar 20, 6:00 PM EDT	Special Weather Statement	MLB	Orange, Seminole	60 min
Mar 20, 6:35 PM EDT	Special Weather Statement	MLB	Saint Lucie	25 min
Mar 20, 7:25 PM EDT	Special Weather Statement	MLB	Saint Lucie	20 min
Mar 20, 7:50 PM EDT	Special Weather Statement	MLB	Martin	25 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.