Alert archive / Florida / Special Weather Statements in 2020

Special Weather Statement, NWS Melbourne, FL

August 20, 2020Indian River County, Florida

NWS Melbourne, FL issued this special weather statement at Aug 20, 2020, 2:57 PM EDT for Indian River County, Florida. It was in force for 33 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
Aug 20, 2020, 2:57 PM EDT (18:57 UTC)
Expired
Aug 20, 2020, 3:30 PM EDT
In force
33 min
Issued by
NWS Melbourne, FL

County Indian River County, FL

The radar

The Melbourne radar (KMLB), 45 km from the middle of the area, began a volume at 18:58 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, 7.0 hours before the alert went out and 79 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 2020-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 150 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 2020-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
150 J/kg
Mixed-layer CIN
-179 J/kg
Mixed-layer LCL
1243 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Aug 20, 10:49 AM EDT, 4 hours 8 minutes earlier.

Area forecast discussion, Aug 20, 10:49 AM EDT, 4 hours 8 minutes before
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</head>
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Hazardous weather outlook, Aug 20, 6:02 AM EDT, 8 hours 55 minutes before
Hazardous Weather Outlook
National Weather Service Melbourne FL
602 AM EDT Thu Aug 20 2020

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-202300-
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-
Northern Lake-Orange-Seminole-Southern Brevard-Osceola-
Indian River-Okeechobee-St. Lucie-Martin-Coastal Volusia-
Southern Lake-Northern Brevard-
602 AM EDT Thu Aug 20 2020

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
A moist southwest flow continues across east central Florida.
This will lead to development of numerous showers and lightning
storms, mainly during the afternoon, with a few storms possibly
lingering near the east coast around sunset. Storm motion will be
a little faster today towards the northeast at 20 to 25 mph. This
will lead to a slightly higher threat for damaging wind gusts of
58 mph or greater compared to Wednesday. Frequent cloud to ground
lightning strikes, small hail, and torrential downpours of 1 to 3
inches will also be possible with today's stronger storms. Move
indoors to safety at the first sign of threatening skies, or if
you hear thunder.

.MARINE THUNDERSTORM GUST IMPACT...
Wind gusts to 35 knots or higher will produce locally higher waves
on inland lakes, Intracoastal Waterway, and nearshore Atlantic as
they move northeast at around 20 knots. Boaters should watch for
storm approaching rapidly from the west and southwest today, and
move to safe harbor in advance of their approach.

.RIP CURRENT IMPACT...
There will be a Moderate risk for life-threatening rip currents at
area beaches today. While rip currents will be present all day,
the threat will be highest from 1230 PM and 630 PM due to tidal
effects. To reduce your chance of being caught in the seaward pull
of a rip current, swim only within sight of a lifeguard, and
never swim alone, while following social distancing guidelines.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
Numerous lightning storms are expected again Friday with scattered
storms on Saturday. The main hazards remain strong gusty winds,
frequent lightning strikes, and heavy downpours. A Moderate Risk
of rip currents will also continue at area beached through this
weekend due to a persistent ocean swell.

Tropical Depression 13, over the west-central Atlantic Ocean, is
forecast to move west-northwest across the southern Bahamas and
toward the Florida Straits and Keys as a tropical storm through
early next week. On its current forecast track, winds and seas
will increase enough to produce poor to locally hazardous boating
conditions Sunday night through Monday, mainly south of Sebastian
Inlet. There may also be an increased potential for gusty showers
and squalls to impact the Atlantic waters, Treasure Coast and
Lake Okeechobee region.

Continue to monitor the latest forecasts for Tropical Depression
13 from the National Hurricane Center, as well as your National
Weather Service office in Melbourne

.SPOTTER INFORMATION STATEMENT...
Spotters should monitor the weather and self activate if needed.

Cristaldi

In the hours before

Special weather statement, Aug 20, 2:57 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Melbourne FL
257 PM EDT Thu Aug 20 2020

FLZ054-201930-
Indian River FL-
257 PM EDT Thu Aug 20 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN INDIAN RIVER COUNTY
UNTIL 330 PM EDT...

At 256 PM EDT, Doppler radar was tracking a strong thunderstorm over
Sebastian Highlands. This storm was nearly stationary.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Sebastian, Indian River Shores, Wabasso, Sebastian Highlands and
Gifford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2768 8033 2765 8053 2782 8054 2782 8051
      2783 8051 2785 8040 2775 8035
TIME...MOT...LOC 1856Z 241DEG 2KT 2776 8048

Combs

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 2:55 PM EDTSpecial Marine WarningMLB95 min
Aug 20, 3:08 PM EDTSpecial Weather StatementMLBMartin37 min
Aug 20, 3:38 PM EDTAreal Flood AdvisoryMLBIndian River112 min
Aug 20, 4:00 PM EDTSpecial Weather StatementMLBBrevard45 min
Aug 20, 4:10 PM EDTSpecial Weather StatementMLBMartin35 min
Aug 20, 4:51 PM EDTSpecial Weather StatementMLBOsceola39 min
Aug 20, 6:21 PM EDTSpecial Weather StatementMLBVolusia24 min
Aug 20, 6:44 PM EDTSevere Thunderstorm WarningMLBVolusia25 min

Nearby

Special Weather Statements in Florida, 2020Every special weather statement in 2020

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.