Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Melbourne, FL

April 7, 2018Lake County, Volusia County, Florida

NWS Melbourne, FL issued this special weather statement at Apr 7, 2018, 6:06 PM EDT for Lake County, Volusia County, Florida. It was in force for 84 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
Apr 7, 2018, 6:06 PM EDT (22:06 UTC)
Expired
Apr 7, 2018, 7:30 PM EDT
In force
84 min
Issued by
NWS Melbourne, FL

Counties Lake County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 134 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 115 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-pSkew-T log-p diagram, Cape Canaveral, FL at 12:00Z on 2018-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 448 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 12:00Z on 2018-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
448 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
905 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Melbourne, FL wrote its last area forecast discussion before this special weather statement went out at Apr 7, 3:33 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Apr 7, 3:33 PM EDT, 2 hours 33 minutes before
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Hazardous weather outlook, Apr 7, 6:02 AM EDT, 12 hours 4 minutes before
Hazardous Weather Outlook
National Weather Service Melbourne FL
602 AM EDT Sat Apr 7 2018

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-080000-
Flagler Beach to Volusia-Brevard County Line 0-20 nm-Volusia-
Brevard County Line to Sebastian Inlet 0-20 nm-
Sebastian Inlet to Jupiter Inlet 0-20 nm-Flagler Beach to Volusia-
Brevard County Line 20-60 nm-Volusia-
Brevard County Line to Sebastian Inlet 20-60 nm-
Sebastian Inlet to Jupiter Inlet 20-60 nm-Inland Volusia County-
Northern Lake County-Orange-Seminole-Southern Brevard County-
Osceola-Indian River-Okeechobee-St. Lucie-Martin-
Coastal Volusia County-Southern Lake County-
Northern Brevard County-
602 AM EDT Sat Apr 7 2018

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
Moisture and deep layer southwest flow will increase ahead of a
cold front. Above normal temperatures in the low levels will
combine with cold air aloft to produce instability and generate
scattered showers and isolated storms this afternoon into early
evening. A few strong storms are possible containing frequent
lightning strikes, downburst winds up to 50 mph and hail. An
isolated severe storm containing damaging winds near 60 mph will
be possible over Lake, Volusia, Seminole, Orange and north Brevard
counties. The time period of greatest threat will be from 3 to 7
pm. Storm motion will be toward the east northeast at 30 to 35
mph.

.RIP CURRENT IMPACT...
A Moderate Risk of rip currents will exist at the beaches of east
central Florida. Always swim within sight of a lifeguard.

.MARINE THUNDERSTORM GUST IMPACT...
Fast moving showers and isolated storms will push toward the east
northeast at 30 to 35 mph and across portions of the intracoastal
and nearshore Atlantic waters this afternoon and early evening. A
few storms will be capable of producing wind gusts of 35 to 45
knots and frequent lightning strikes.

.WIND AND SEA IMPACT...
Small craft should exercise caution over the Gulf Stream and
offshore Atlantic waters for south to southwest winds 15 to 20
knots today, becoming west at the same speeds tonight.

.FIRE WEATHER IMPACT...
Continued dry vegetation and gusty southwest winds will contribute
to a High Fire Danger across portions of east central Florida. Any
new or existing fires will spread rapidly.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
A cold front is forecast to stall across south central Florida
Sunday then lift north as a warm front Monday, before finally
settling south of the area Wednesday. This will keep our weather
unsettled with a chance for beneficial rains early next week along
with lightning storms. While severe weather is not expected at
this time, gusty downburst winds and dangerous cloud to ground
lightning will be the primary threats.

.SPOTTER INFORMATION STATEMENT...
Spotters are requested to monitor the weather and self activate
if needed.

Kelly

In the hours before

Local storm report, Apr 7, 4:34 PM EDT, 1 hour 32 minutes before
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Special weather statement, Apr 7, 6:06 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 7, 3:23 PM EDTSevere Thunderstorm WarningMLBIndian River, Okeechobee, Saint Lucie16 min
Apr 7, 3:36 PM EDTSpecial Marine WarningMLB84 min
Apr 7, 5:24 PM EDTSpecial Marine WarningMLB66 min
Apr 7, 6:34 PM EDTSpecial Marine WarningMLB86 min
Apr 7, 7:18 PM EDTSpecial Weather StatementMLBBrevard, Orange, Osceola, Seminole87 min
Apr 7, 7:53 PM EDTSpecial Marine WarningMLB112 min

Nearby

Special Weather Statements in Florida, 2018Every special weather statement 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.