Alert archive / Florida / Special Weather Statements in 2020

Special Weather Statement, NWS Melbourne, FL

May 18, 2020Brevard County, Florida

NWS Melbourne, FL issued this special weather statement at May 18, 2020, 11:52 AM EDT for Brevard County, Florida. It was in force for 53 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: May 18, 2020, 11:52 AM EDT (15:52 UTC)
Expired: May 18, 2020, 12:45 PM EDT
In force: 53 min
Issued by: NWS Melbourne, FL

County Brevard County, FL

The radar

The Melbourne radar (KMLB), 47 km from the middle of the area, began a volume at 15:53 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

Tampa Bay, FL (KTBW), launched 12:00Z, 3.9 hours before the alert went out and 182 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: 647 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 743 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.5

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 May 18, 10:19 AM EDT, 1 hour 33 minutes earlier.

Area forecast discussion, May 18, 10:19 AM EDT, 1 hour 33 minutes before

Area Forecast Discussion
National Weather Service Melbourne FL
1019 AM EDT Mon May 18 2020

.DISCUSSION...

...Strong to Isolated Severe Storms Possible Today into this
Evening...

Strong to isolated severe storms that moved onshore the west
coast of Florida will continue east-northeast and will move into
Lake, western Orange and western Osceola counties late this
morning. This convection may weaken some before reaching these
areas, but strong wind gusts will still be possible. This
convection is moving in slightly earlier than expected and will
be increasing cloud cover into the late morning and early
afternoon. However, there should be enough daytime
heating/instability, combined with sufficient lift from
approaching vigorous mid level S/W trough to allow storms and
areas of rain to continue pushing through the area with additional
scattered to numerous storms development ahead of this activity
through the afternoon.

Strong to isolated severe storms will still be possible,
especially as any of these storms collide with the east coast sea
breeze should it develop from the Cape southward this afternoon.
Main impacts include frequent lightning, local wind gusts up to
50-60 mph, hail to one inch in diameter and torrential downpours.

&&

.AVIATION...Showers and storms are moving into faster and should
reach KISM-KLEE-KMCO by late this morning, with further eastward
movement and additional convective development through the
afternoon across the I-4 corridor and toward the coast. Tempo
groups will need to be adjusted earlier, especially for the
inland TAF sites for tempo IFR/MVFR conditions from this activity.
A few storms could still become strong to severe today. Cell
movement SW to NE at 20-30 kts and main impacts of frequent
lightning, hail, strong/gusty winds, and torrential downpours.

&&

.MARINE...Today-Tonight...(Previous Discussion) Rather weak
pressure pattern across the area. General SWRLY winds across the
area will back along the coast in the afternoon with sea breeze
formation, though this feature will likely remained pinned near
the coast. Wind direction this evening (outside of any
convection), SE/S, then becoming more SSW by daybreak Tue morning.
Wind speeds AOB 15 kts, but may creep up to 14- 17 kts briefly
overnight, well offshore, north of the Cape. Seas 2-3 ft near
shore and 3-4 ft offshore north of Ft. Pierce. There will be a
vigorous upper level system traverse the area late day and into
tonight. The storm steering flow will be from the SW twd the NE at
25-35 kts with SCT-NMRS offshore moving storms forecast into the
afternoon and continuing tonight. Storm impacts include torrential
downpours, frequent lightning, hail, and wind gusts in excess of
35 kts, perhaps 50 kts. Winds/seas locally higher invof storms.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  88  68  88  66 /  60  50  30  10
MCO  88  68  90  67 /  70  50  50  10
MLB  88  70  91  69 /  70  60  70  10
VRB  88  69  91  68 /  70  60  70  20
LEE  87  69  89  68 /  70  50  30  10
SFB  90  68  90  67 /  70  50  40  10
ORL  88  70  90  67 /  70  50  50  10
FPR  88  70  91  69 /  70  60  70  20

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...None.
&&

Weitlich/Negron

Hazardous weather outlook, May 18, 11:38 AM EDT, 14 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Melbourne FL
1138 AM EDT Mon May 18 2020

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-190000-
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-
1138 AM EDT Mon May 18 2020

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

.THUNDERSTORM IMPACT...
An upper level disturbance will traverse the Florida peninsula
later today and help to enhance shower and storm coverage and
intensity later today. Out ahead of it daytime heating, increasing
moisture, and sea breeze and other mesoscale boundary
interactions will promote scattered to numerous lightning storm
development late this morning through the evening. Isolated to
scattered storms will continue to push to the northeast moving
over the western counties of our forecast area and reach the
coastal counties by noon. It will reach the coast and then across
the intracoastal and near shore Atlantic waters into early
evening. We may see an additional round of showers and storms
later in the evening and overnight as models also suggest activity
over the eastern Gulf will push onshore and across the peninsula.

In addition to torrential downpours and dangerous cloud to ground
lightning strikes, a few of the storms will be capable of
producing damaging wind gusts of 50 to 60 mph. Hail up to
quarter size will also be possible in stronger storms. Expect
movement toward the northeast or east at 25 to 35 mph. Persons in
east central Florida should stay informed of the weather expected
later today. Be prepared to move indoors to a place of safety well
in advance of storms.

Be sure to have multiple ways of receiving severe weather alerts.
This includes a NOAA Weather Radio, a cell phone with wireless
alerts enabled, or through local television stations.

.FLOOD IMPACT...
Multiple rounds of scattered to numerous showers and storms moving
across east central Florida this afternoon and tonight will
produce locally heavy rainfall. This could result in considerable
ponding of water on roadways and other poorly drained surfaces.

.RIP CURRENT IMPACT...
Ocean and weather conditions will produce a Moderate risk of life
threatening rip currents at area beaches today. The threat for
dangerous rip currents will be present all day, but will be
highest through 300 PM due to tidal effects. Swim within sight of
a lifeguard. If no lifeguard is present, think twice before
entering the very rough surf.

.MARINE THUNDERSTORM GUST IMPACT...
Scattered to numerous lightning storms will move across east
central Florida this afternoon and tonight. They will push quickly
across the Intracoastal Waterway and near shore Atlantic waters
and produce wind gusts in excess of 35 knots, with some storms
capable of local wind gusts in excess of 50 knots. Hail to quarter
size and torrential downpours will also accompany some storms.

Inland lakes are not immune from the effects of strong to severe
storms and hazardous boating conditions can quickly develop over
lakes with gusty winds and frequent lightning. Be prepared to
seek safe harbor well before a storm approaches your area.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
There will be an increasing threat for afternoon and evening
lightning storms for much of the upcoming week. Parameters are
coming in play that may allow for scattered strong storms, again,
Tuesday afternoon and evening. Activity is forecast to move from
the west to east and will move off of the coast and may affect
marine interests each afternoon and evening. Storm impacts include
frequent lightning, strong wind gusts, hail and torrential
downpours.

Distant moderate to large swells from the remnants of Arthur will
begin to push into the east central Florida Atlantic waters from
mid to late week increasing wave heights and promoting poor to
hazardous small craft boating conditions. In addition, the rip
current risk from these long period swells will likely be High at
area beaches.

.SPOTTER INFORMATION STATEMENT...
Spotter activation may be needed. Please relay any information about
severe weather to the NWS while following all local, state, and CDC
guidelines.

Negron/Sedlock

In the hours before

Special weather statement, May 18, 10:20 AM EDT, 1 hour 32 minutes before

Special Weather Statement
National Weather Service Melbourne FL
1020 AM EDT Mon May 18 2020

FLZ045-053-144-181515-
Osceola FL-Orange FL-Southern Lake County FL-
1020 AM EDT Mon May 18 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LAKE...SOUTHWESTERN
ORANGE AND CENTRAL OSCEOLA COUNTIES UNTIL 1115 AM EDT...

At 1020 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles south of Bushnell to 8 miles north of
Auburndale to near Wauchula. Movement was northeast at 35 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Kissimmee, Winter Garden, Saint Cloud, Groveland and Mascotte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 2860 8196 2860 8169 2838 8136 2774 8095
      2768 8115 2782 8121 2786 8130 2792 8131
      2806 8146 2801 8138 2808 8135 2809 8145
      2814 8146 2814 8152 2826 8156 2827 8166
      2835 8166 2836 8186 2835 8186 2835 8196
TIME...MOT...LOC 1420Z 243DEG 28KT 2852 8209 2819 8184 2760 8179

KN

Special weather statement, May 18, 11:26 AM EDT, 26 minutes before

Special Weather Statement
National Weather Service Melbourne FL
1126 AM EDT Mon May 18 2020

FLZ045-046-053-181615-
Osceola FL-Orange FL-Seminole FL-
1126 AM EDT Mon May 18 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SEMINOLE...
SOUTHEASTERN ORANGE AND NORTHEASTERN OSCEOLA COUNTIES UNTIL 1215 PM
EDT...

At 1125 AM EDT, Doppler radar was tracking strong showers adn
thunderstorms over Azalea Park and Narcoossee, moving northeast at
30 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Orlando, Oviedo, Winter Park, Wedgefield and Bithlo.

LAT...LON 2855 8140 2875 8110 2843 8090 2842 8090
      2841 8088 2839 8089 2838 8088 2837 8088
      2837 8087 2836 8087 2835 8086 2833 8086
      2822 8126
TIME...MOT...LOC 1525Z 232DEG 28KT 2853 8126

KN

Special weather statement, May 18, 11:52 AM EDT, 0 minutes before

Special Weather Statement
National Weather Service Melbourne FL
1152 AM EDT Mon May 18 2020

FLZ041-046-047-141-147-181645-
Southern Brevard County FL-Coastal Volusia FL-
Northern Brevard County FL-Seminole FL-Inland Volusia FL-
1152 AM EDT Mon May 18 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN SEMINOLE...NORTHERN
BREVARD AND SOUTHEASTERN VOLUSIA COUNTIES UNTIL 1245 PM EDT...

At 1151 AM EDT, Doppler radar was tracking strong showers and
thunderstorms along a line extending from near Osteen to near Space
Coast Airport to 6 miles west of Viera. Movement was northeast at 35
mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Port Orange, Titusville, Rockledge, New Smyrna Beach and Edgewater.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2860 8054 2846 8049 2839 8056 2833 8057
      2823 8056 2813 8086 2835 8086 2837 8088
      2847 8089 2847 8087 2850 8088 2851 8091
      2860 8095 2865 8103 2898 8119 2911 8091
TIME...MOT...LOC 1551Z 241DEG 32KT 2885 8112 2849 8088 2823 8082

KN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:17 PM EDT	Special Weather Statement	MLB	Indian River	28 min
May 18, 10:20 AM EDT	Special Weather Statement	MLB	Polk	55 min
May 18, 11:26 AM EDT	Special Weather Statement	MLB	Orange, Seminole	49 min
May 18, 11:47 AM EDT	Special Marine Warning	MLB		72 min
May 18, 1:22 PM EDT	Special Weather Statement	MLB	Okeechobee	53 min
May 18, 3:22 PM EDT	Special Marine Warning	MLB		83 min
May 18, 3:25 PM EDT	Special Weather Statement	MLB	Martin	50 min
May 18, 3:55 PM EDT	Special Marine Warning	MLB		65 min

Nearby

Special Weather Statements in Florida, 2020 Every 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.