Alert archive / Florida / Special Weather Statements in 2017

Special Weather Statement, NWS Melbourne, FL

September 1, 2017Volusia County, Florida

NWS Melbourne, FL issued this special weather statement at Sep 1, 2017, 10:12 PM EDT for Volusia County, Florida. It was in force for 48 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: Sep 1, 2017, 10:12 PM EDT (02:12 UTC)
Expired: Sep 1, 2017, 11:00 PM EDT
In force: 48 min
Issued by: NWS Melbourne, FL

County Volusia County, FL

The radar

The Jacksonville radar (KJAX), 140 km from the middle of the area, began a volume at 02:13 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

Jacksonville, FL (KJAX), launched 00:00Z, 2.2 hours before the alert went out and 142 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: 1915 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

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 Sep 1, 9:33 PM EDT, 39 minutes earlier.

Area forecast discussion, Sep 1, 9:33 PM EDT, 39 minutes before

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Hazardous weather outlook, Sep 1, 1:02 PM EDT, 9 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service Melbourne FL
102 PM EDT Fri Sep 1 2017

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-020515-
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-
102 PM EDT Fri Sep 1 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
High moisture and instability over central Florida will bring a
chance for strong afternoon thunderstorms. The first lightning
storms of the day are expected to develop along the east coast sea
breeze boundary this afternoon south of Melbourne, as well as
north of the I-4 Corridor. Storms will focus over east central
Florida north of the Beachline Expressway late this afternoon and
early this evening as the sea breeze boundaries interact. Some
storms will produce wind gusts between 40 and 50 mph, with the
possibility of severe winds around 60 mph late this afternoon and
early evening. Frequent to excessive lightning strikes, very heavy
downpours, and small hail will be possible as well.

.FLOOD IMPACT...
Local heavy rain will be possible mainly from Brevard and Osceola
counties northward where thunderstorms concentrate this afternoon
and evening. Rainfall amounts between 2 and 3 inches will be
possible within a 60 to 90 minute time frame that will produce ponding
of water on roadways and flooding in poor drainage areas.

.RIP CURRENT IMPACT...
An increasing east swell will bring a moderate risk for rip
currents along area beaches. The greatest threat will be through
early this afternoon due to tidal effects. Remember to swim near
a lifeguard and never swim alone.

.MARINE THUNDERSTORM GUST IMPACT...
Afternoon storms capable of generating wind gusts in excess of 35
knots will pose a hazard to boats on inland lakes, as well as the
Atlantic and Intracoastal Waters, especially north of Sebastian
Inlet.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
Deep moisture will remain over central Florida through weekend,
allowing scattered to numerous showers and thunderstorms to
develop each afternoon and early evening, especially over the
interior counties. The primary threats will be lightning strikes,
strong wind gusts, and local heavy rainfall.

.SPOTTER INFORMATION STATEMENT...
Spotters are requested to monitor the weather and self activate
if needed. Spotters are encouraged to report rainfall amounts of
3 inches or greater.

Bragaw

In the hours before

Special weather statement, Sep 1, 5:03 PM EDT, 5 hours 9 minutes before

Special Weather Statement
National Weather Service Melbourne FL
503 PM EDT FRI SEP 1 2017

FLZ041-141-012200-
Inland Volusia County FL-Coastal Volusia County FL-
503 PM EDT FRI SEP 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR VOLUSIA COUNTY UNTIL 600 PM
EDT...

At 458 PM EDT, Doppler radar was tracking strong thunderstorms
developing southward from northeast Volusia County and Ormond by the
Sea. Activity will continue to develop further southward into this
evening with movement toward the north or northeast at around 10
mph..

Wind gusts of 45 to 55 mph will be possible with these storms.

Locations impacted include...
Deltona, Daytona Beach, Port Orange, Ormond Beach and DeLand.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall will be possible with current and future storms,
and may lead to localized flooding. Do not drive your vehicle
through flooded roadways.

Frequent cloud to ground lightning will also be possible with some
storms. Lightning can strike 10 miles away from a thunderstorm. Seek
a safe shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional
information and possible warnings from the National Weather Service.

&&

LAT...LON 2943 8107 2909 8090 2893 8078 2881 8074
      2886 8135 2926 8124 2927 8115 2941 8116
      2943 8111
TIME...MOT...LOC 2058Z 240DEG 49KT 2944 8105

Sedlock

Special weather statement, Sep 1, 6:43 PM EDT, 3 hours 29 minutes before

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Special weather statement, Sep 1, 8:19 PM EDT, 1 hour 53 minutes before

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Local storm report, Sep 1, 8:25 PM EDT, 1 hour 47 minutes before

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Special weather statement, Sep 1, 10:12 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 8:02 PM EDT	Special Marine Warning	MLB		88 min
Sep 1, 8:19 PM EDT	Special Weather Statement	MLB	Orange	41 min
Sep 2, 3:29 PM EDT	Areal Flood Advisory	MLB	Brevard	3 hr
Sep 2, 4:00 PM EDT	Special Weather Statement	MLB	Brevard	45 min
Sep 2, 4:09 PM EDT	Areal Flood Advisory	MLB	Brevard	2 hr
Sep 2, 4:16 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	44 min
Sep 2, 4:18 PM EDT	Special Marine Warning	MLB		117 min
Sep 2, 5:26 PM EDT	Special Weather Statement	MLB	Osceola	49 min
Sep 2, 5:27 PM EDT	Special Weather Statement	MLB	Brevard	48 min
Sep 2, 5:50 PM EDT	Areal Flood Advisory	MLB	Brevard	115 min
Sep 2, 6:13 PM EDT	Special Marine Warning	MLB		92 min
Sep 2, 6:16 PM EDT	Special Weather Statement	MLB	Osceola	44 min
Sep 2, 6:42 PM EDT	Special Weather Statement	MLB	Volusia	48 min

Nearby

Special Weather Statements in Florida, 2017 Every special weather statement in 2017

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.