Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 2, NWS Melbourne, FL

March 20, 2018Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 20, 2018, 10:31 AM EDT for Volusia County, Florida. It was in force for 29 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, 10:31 AM EDT (14:31 UTC)
Expired: Mar 20, 2018, 11:00 AM EDT
In force: 29 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 135 km from the middle of the area, began a volume at 14:30 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 2.5 hours before the alert went out and 105 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: 860 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 864 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

265 
WUUS52 KMLB 201431
SVRMLB
FLC127-201500-
/O.NEW.KMLB.SV.W.0002.180320T1431Z-180320T1500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
1031 AM EDT TUE MAR 20 2018

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  North central Volusia County in east central Florida...

* Until 1100 AM EDT

* At 1030 AM EDT, a severe thunderstorm was located just west Ormond 
  Beach, moving east at 35 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Daytona Beach, Ormond Beach, Holly Hill, Ormond-By-the-Sea and
  Ormond Beach Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into a
small central room in a sturdy structure.

&&

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

LAT...LON 2921 8096 2919 8119 2926 8121 2927 8115
      2931 8115 2937 8104
TIME...MOT...LOC 1430Z 250DEG 30KT 2924 8114 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Blottman

2 follow-up statements

296 
WWUS52 KMLB 201443
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1043 AM EDT TUE MAR 20 2018

FLC127-201500-
/O.CON.KMLB.SV.W.0002.000000T0000Z-180320T1500Z/
Volusia FL-
1043 AM EDT TUE MAR 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM EDT
FOR NORTH CENTRAL VOLUSIA COUNTY...

At 1041 AM EDT, a severe thunderstorm was located over Ormond Beach,
moving east at 35 mph. This storm will move offshore around 1050 AM.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Ormond Beach, Ormond-By-the-Sea and Ormond Beach Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into a
small central room in a sturdy structure.

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

&&

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

LAT...LON 2921 8096 2919 8119 2926 8121 2927 8115
      2931 8115 2937 8104
TIME...MOT...LOC 1441Z 250DEG 30KT 2927 8103 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

Blottman

867 
WWUS52 KMLB 201502
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
1102 AM EDT TUE MAR 20 2018

FLC127-201511-
/O.EXP.KMLB.SV.W.0002.000000T0000Z-180320T1500Z/
Volusia FL-
1102 AM EDT TUE MAR 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL VOLUSIA COUNTY
HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

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

LAT...LON 2921 8096 2919 8119 2926 8121 2927 8115
      2931 8115 2937 8104
TIME...MOT...LOC 1501Z 250DEG 30KT 2933 8085 

$$

Blottman

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, 10:33 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, 2:24 PM EDT	Severe Thunderstorm Warning	MLB	Lake	36 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.