Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 29, NWS Melbourne, FL

May 21, 2020Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 21, 2020, 7:31 PM EDT for Seminole County, Florida. It was in force for 29 min. 18 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 21, 2020, 7:31 PM EDT (23:31 UTC)
Expired: May 21, 2020, 8:00 PM EDT
In force: 29 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Seminole County, FL

The radar

The Melbourne radar (KMLB), 101 km from the middle of the area, began a volume at 23:32 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.

What was reported inside it

Time	Report	Where	Remark
May 21, 7:36 PM EDT	HAIL 1	Lake Mary, FL	PUBLIC REPORTED QUARTER SIZED HAIL IN LAKE MARY VIA A PHOTO ON TWITTER. TIME ESTIMATED FROM RADAR.
May 21, 7:40 PM EDT	HAIL 2	2 Ene Lake Mary, FL	TRAINED SPOTTER REPORTED 2 INCH HAIL WITH PICTURE.
May 21, 7:41 PM EDT	HAIL 1.25	5 Wnw Lake Jessup, FL	TRAINED SPOTTER REPORTED QUARTER TO HALF DOLLAR SIZE HAIL.
May 21, 7:42 PM EDT	HAIL 1.5	Sanford, FL	TRAINED SPOTTER REPORTED 1 AND A HALF INCH HAIL IN SANFORD WITH PHOTO. TIME ESTIMATED FROM RADAR.
May 21, 7:42 PM EDT	HAIL 2	1 Ese Lake Mary, FL	PUBLIC REPORTED ESTIMATED 2 INCH HAIL VIA A PHOTO ON TWITTER. TIME ESTIMATED FROM RADAR.
May 21, 7:42 PM EDT	HAIL 2	6 N Casselberry, FL	PHOTO OF ESTIMATED 2 INCH HAIL RECEIVED FROM FAMILY OF NWS EMPLOYEE. TIME ESTIMATED FROM RADAR.
May 21, 7:45 PM EDT	HAIL 1	5 S Debary, FL	PUBLIC REPORTS QUARTER SIZE HAIL IN SANFORD NEAR STATE ROAD 46 AND ELDER ROAD.
May 21, 7:45 PM EDT	HAIL 1.75	2 W Sanford, FL	PUBLIC REPORTED GOLFBALL SIZED HAIL. TIME ESTIMATED FROM RADAR.
May 21, 7:45 PM EDT	HAIL 1.75	5 S Debary, FL	PUBLIC REPORTS QUARTER TO GOLF BALL SIZE HAIL NEAR SR 46 AND WHITE CEDAR ROAD.
May 21, 7:45 PM EDT	HAIL 1.75	6 Wnw Lake Jessup, FL	MEMBER OF THE PUBLIC REPORTED GOLF BALL SIZE HAIL.
May 21, 7:45 PM EDT	HAIL 2	2 Ne Lake Mary, FL	PUBLIC REPORTED ESTIMATED 2 INCH HAIL VIA A PHOTO ON TWITTER. TIME ESTIMATED FROM RADAR.
May 21, 7:45 PM EDT	HAIL 2	3 N Lake Mary, FL	TRAINED SPOTTER REPORTED 2 INCH HAIL AT RINEHART RD AND SR 417.
May 21, 7:45 PM EDT	HAIL 2.5	5 Wnw Lake Jessup, FL	NUMEROUS REPORTS FROM THE HIDDEN LAKES SUBDIVISION RECEIVED FROM THE PUBLIC OF HAIL AROUND 2 AND A HALF INCHES.
May 21, 7:46 PM EDT	HAIL 0.7	4 Nw Lake Jessup, FL	PUBLIC REPORTS DIME SIZE HAIL NEAR SANFORD AVE AND LAKE MARY AVE.
May 21, 7:47 PM EDT	TSTM WND GST 41	Sanford Airport, FL	MEASURED WIND GUST 41 MPH OUT OF THE SOUTH. 200/35 KNOTS.
May 21, 7:48 PM EDT	HAIL 1	Sanford, FL	SEMINOLE COUNTY EMERGENCY MANAGEMENT REPORTS QUARTER SIZED HAIL IN SANFORD.
May 21, 7:50 PM EDT	HAIL 3	2 Nne Lake Mary, FL	TRAINED SPOTTER REPORTS 3 INCH HAIL.
May 21, 8:00 PM EDT	HAIL 0.75	6 Sse Debary, FL	TRAINED SPOTTER REPORTS PENNY SIZED HAIL IN DOWNTOWN SANFORD NEAR EAST 1ST STREET AND MAGNOLIA AVE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 15 storm reports to this severe thunderstorm warning; the first came 5 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.5 hours before the alert went out and 91 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: 584 J/kg
Mixed-layer CIN: -172 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

065 
WUUS52 KMLB 212331
SVRMLB
FLC117-220000-
/O.NEW.KMLB.SV.W.0029.200521T2331Z-200522T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
731 PM EDT Thu May 21 2020

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Western Seminole County in east central Florida...

* Until 800 PM EDT.

* At 731 PM EDT, a severe thunderstorm was located over Lake Mary,
  and is nearly stationary.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Sanford, Altamonte Springs, Oviedo, Winter Springs and Casselberry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2871 8144 2872 8143 2875 8141 2879 8141
      2881 8142 2883 8142 2884 8140 2884 8133
      2883 8132 2883 8123 2880 8121 2867 8122
      2868 8145
TIME...MOT...LOC 2331Z 186DEG 4KT 2872 8131 

HAIL...1.25IN
WIND...60MPH
 
$$

Combs

2 follow-up statements

794 
WWUS52 KMLB 212341
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
741 PM EDT Thu May 21 2020

FLC117-220000-
/O.CON.KMLB.SV.W.0029.000000T0000Z-200522T0000Z/
Seminole FL-
741 PM EDT Thu May 21 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR WESTERN SEMINOLE COUNTY...

At 741 PM EDT, a severe thunderstorm was located over Lake Mary, 
moving north at 5 mph. Hail to the size of quarters was reported in 
Lake Mary.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Public.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Sanford, Altamonte Springs, Oviedo, Winter Springs and Casselberry. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2871 8144 2872 8143 2875 8141 2879 8141
      2881 8142 2883 8142 2884 8140 2884 8133
      2883 8132 2883 8123 2880 8121 2867 8122
      2868 8145
TIME...MOT...LOC 2341Z 174DEG 6KT 2875 8132 

HAIL...1.25IN
WIND...60MPH
 
$$

Combs

698 
WWUS52 KMLB 212348
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
748 PM EDT Thu May 21 2020

FLC117-220000-
/O.CON.KMLB.SV.W.0029.000000T0000Z-200522T0000Z/
Seminole FL-
748 PM EDT Thu May 21 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR WESTERN SEMINOLE COUNTY...

At 748 PM EDT, a severe thunderstorm was located over Sanford, 
moving northeast at 5 mph. Hail to the size of golf balls has been 
reported with this storm.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Public.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Sanford, Oviedo, Winter Springs, Casselberry and Lake Mary. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 2874 8137 2879 8141 2881 8141 2883 8142
      2884 8140 2884 8133 2883 8132 2883 8123
      2880 8121 2867 8122 2868 8137
TIME...MOT...LOC 2348Z 214DEG 6KT 2877 8129 

HAIL...1.75IN
WIND...60MPH
 
$$

Combs

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 21, 3:58 PM EDT, 3 hours 33 minutes earlier.

Area forecast discussion, May 21, 3:58 PM EDT, 3 hours 33 minutes before

Area Forecast Discussion
National Weather Service Melbourne FL
358 PM EDT Thu May 21 2020

.DISCUSSION...

...Strong to Isolated Severe Storms Possible Through This
Evening...
...High Risk of Rip Currents Continuing Through Late Week...

Tonight-Friday...Sea breeze boundaries will continue to move
inland with scattered showers and storms developing through late
afternoon and toward sunset across east central Florida. The
threat of strong to a few severe storms will continue through this
the remainder of the day and into this evening. Main threats from
this activity will be wind gusts up to 50 to 60 mph, small to 1
inch diameter hail, frequent lightning and locally heavy rainfall
of 1-2 inches. Convection will diminish or shift offshore through
late evening, with rain chances ending near to just after
midnight. Lows will fall into the upper 60s to low 70s tonight,
and locations that see locally heavy rainfall may see some patchy
fog develop near daybreak Friday.

Some drier air moving into the area will lower rain chances into
tomorrow. However, isolated to scattered showers and storms will
still be possible along the inland moving east coast sea breeze
with greatest rain chances up to 30-40 percent over the interior
where boundary collisions are more likely. It will be another hot
day with highs in the upper 80s/near 90 along the coast and low to
mid 90s over the interior.

Saturday-Sunday...Low level east-southeast winds will generally
prevail across the area into the weekend, with the ridge axis
positioned across the north-central Florida peninsula. East coast
sea breeze will be able to develop and move inland each afternoon,
with isolated to scattered showers and storms developing, mainly
west of I-95. Rain chances remain on the lower end overall,
ranging from 20 percent along the coast to 30 percent well inland.

Temperatures will remain near to above normal through the
weekend, with highs reaching the mid to upper 80s along the coast,
and up to the upper 80s to low 90s inland (potentially mid 90s
well inland on Saturday). Warm and muggy morning for some areas as
temps only drop into the low 70s, which is slightly above normal
for this time of year.

Monday-Wednesday...(Previous Discussion) Consistent daily pattern
for next week as scattered showers and thunderstorms will develop
each afternoon with rain chances around 30-50 percent areawide.
Main threat with any storm that develops will be deadly cloud-to-
ground lightning strikes. The Bermuda High Pressure strengthens
over the central Atlantic with the axis of the ridge north of the
Florida peninsula. Afternoon highs reach the mid 80s along the
coast and upper 80s to around 90 degrees inland. Morning lows each
day near their seasonal values in the upper 60s, though it could
stay warm overnight along the immediate coast due to onshore winds
and high moisture values.

An interesting note in the evolving long term weather pattern.
Early next week both the GFS and ECMWF show the remnants of the
current cutoff low over the eastern CONUS becoming cutoff again
over the western Atlantic. This upper low will be weaker but
should find itself parked just east of Florida by Thursday. At the
same time a second cutoff low will develop over Texas by mid
week, keeping east central Florida underneath persistent easterly
flow. In this case, we will continue to see scattered afternoon
showers/storms with highest rain chances remaining over the
central/western peninsula.

&&

.AVIATION...
VFR conditions prevailing, with scattered to numerous showers and
thunderstorms developing this afternoon through sunset. Highest
storm potential will be west of I-95 and from KMCO/KISM south. A few
storms have the potential to produce winds of 35 kts or greater.
Storms coverage will decrease after sunset, but a few showers may
linger around the area for a few hours, hence VCSH continuing at
some terminals after 00Z.

&&

.MARINE...

Tonight-Friday...Swells up to 6-7 feet will continue to produce
poor to hazardous boating conditions across the coastal waters,
with SCA continuing over the Gulf Stream waters through early
Friday morning. Winds may become quite variable and gusty should
any storms or outflow boundaries they produce shift offshore
through late evening. Otherwise, winds will generally be out of
the S/SE becoming E/SE into tomorrow as the east coast sea breeze
develops and moves inland.

Saturday-Monday...(Previous Discussion) Improved boating
conditions for the holiday weekend as high pressure builds
westward across the Florida peninsula. Southeast winds
Saturday/Sunday become east on Monday, and will generally increase
to around 10 knots each afternoon. Could be a bit choppy on
Saturday with seas 4-5 feet across the waters, then subsiding to
3-4 feet Sunday, and 2-3 feet on Monday. Each afternoon will see
isolated to scattered lightning storms develop. Mariners should
keep an eye on the skies this holiday weekend as the main threat
with any storm will be deadly cloud-to- ground lightning strikes.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  69  90  72  89 /  30  30  10  20
MCO  71  94  72  92 /  50  30  20  30
MLB  70  87  74  86 /  50  20  10  20
VRB  70  88  72  87 /  30  20  10  10
LEE  71  95  73  94 /  30  40  30  30
SFB  70  94  72  93 /  50  30  20  20
ORL  71  93  73  92 /  50  30  20  30
FPR  70  87  71  86 /  30  20  10  20

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...None.
AM...Small Craft Advisory until 10 AM EDT Friday for Flagler Beach to
     Volusia-Brevard County Line 20-60 nm-Sebastian Inlet to
     Jupiter Inlet 0-20 nm-Sebastian Inlet to Jupiter Inlet 20-
     60 nm-Volusia-Brevard County Line to Sebastian Inlet 20-60
     nm.

&&

Weitlich/Smith/Leahy

Hazardous weather outlook, May 21, 5:43 AM EDT, 13 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Melbourne FL
543 AM EDT Thu May 21 2020

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-220000-
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-
543 AM EDT Thu May 21 2020

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
Strong surface heating and cold temperatures aloft will produce
substantial instability this afternoon, allowing for scattered
lightning storms to develop as the east coast sea breeze pushes
inland. The best chance for a few strong to possibly severe storms
will be from Seminole, Orange and Brevard counties southward to
Lake Okeechobee and the Treasure coast between 4 pm and 8 pm. The
threat for strong storms will decrease after sunset but lingering
rains with embedded storms will persist in some areas past sunset
and diminish by midnight.

The primary threats will be wind gusts up to 60 mph, frequent
lightning strikes and small hail.

.FLOOD IMPACT...
Slow moving storms will produce locally heavy rain this afternoon
and early evening, capable of producing 1 to 2 inches in an hour
or less. This could produce temporary flooding of some roads and
poor drainage areas especially in urbanized locations.

.RIP CURRENT IMPACT...
Long period Northeast swells will reach the coast today and
produce a High Risk of life threatening rip currents along with
rough surf. Rip currents can pull even the best swimmers away
from shore into deeper water. Entering the surf is not
recommended.

.MARINE THUNDERSTORM GUST IMPACT...
Scattered lightning storms will develop this afternoon just inland
from the coast. A few storms will push offshore the coast while
others develop farther into the interior during the late afternoon
and early evening. Conditions are favorable for strong wind gusts
of 35 to 45 knots affecting some of the inland lakes as well as
the intracoastal and nearshore Atlantic waters.

.WIND AND SEA IMPACT...
Northeast swells of 5 to 7 feet will impact the local Atlantic
waters through tonight. The primary concern will be hazardous
conditions near inlets for small craft, especially during the
outgoing tide.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
Long period Northeast swells will continue to propagate into the
surf zone through the holiday weekend. These swells will produce a
High Risk of rip currents on Friday and at least a Moderate Risk
this weekend. In addition, small craft will experience hazardous
conditions near inlets especially during the outgoing tide.

Isolated to scattered lightning storms are expected each day,
mainly in the afternoons. The primary hazard from storms this
weekend and early next week will be cloud to ground lightning.

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

Kelly

In the hours before

Local storm report, May 21, 6:54 PM EDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
654 PM EDT THU MAY 21 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0627 PM     TSTM WND GST     MELBOURNE AIRPORT       28.10N 80.64W
05/21/2020  M51 MPH          BREVARD            FL   ASOS

            MEASURED WIND GUST AT MELBOURNE AIRPORT OUT OF THE
            SOUTHWEST 210/44 KNOTS.

&&

JCP

Local storm report, May 21, 7:09 PM EDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
709 PM EDT THU MAY 21 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0640 PM     TSTM WND GST     PATRICK AIR FORCE BASE  28.24N 80.61W
05/21/2020  M42 MPH          BREVARD            FL   AWOS

            MEASURED WIND GUST OUT OF THE SOUTH AT 42 MPH. 190/36
            KNOTS.

&&

JCP

Local storm report, May 21, 7:22 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
722 PM EDT THU MAY 21 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0656 PM     TSTM WND GST     ORLANDO INTERNATIONAL A 28.43N 81.31W
05/21/2020  M45 MPH          ORANGE             FL   ASOS

            MEASURED WIND GUST 45 MPH FROM THE SOUTH 170/39 KNOTS.

&&

JCP

Special weather statement, May 21, 7:24 PM EDT, 7 minutes before

Special Weather Statement
National Weather Service Melbourne FL
724 PM EDT Thu May 21 2020

FLZ046-220000-
Seminole FL-
724 PM EDT Thu May 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR SEMINOLE COUNTY UNTIL 800 PM
EDT...

At 724 PM EDT, Doppler radar was tracking a strong thunderstorm over
Longwood. This storm was nearly stationary.

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

Locations impacted include...
Sanford, Altamonte Springs, Oviedo, Winter Springs and Casselberry.

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 2871 8144 2874 8142 2880 8141 2880 8121
      2879 8120 2880 8118 2878 8118 2879 8114
      2880 8113 2880 8111 2861 8107 2861 8133
      2864 8133 2864 8146 2871 8146
TIME...MOT...LOC 2324Z 273DEG 3KT 2870 8132

Combs

Local storm report, May 21, 7:25 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
725 PM EDT THU MAY 21 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0710 PM     TSTM WND GST     ORLANDO EXECUTIVE AIRPO 28.55N 81.34W
05/21/2020  M42 MPH          ORANGE             FL   ASOS

            MEASURED WIND GUST OF 42 MPH FROM THE SOUTH 170/36 KNOTS.

&&

JCP

Special weather statement, May 21, 7:26 PM EDT, 5 minutes before

Special Weather Statement
National Weather Service Melbourne FL
726 PM EDT Thu May 21 2020

FLZ047-147-220000-
Southern Brevard County FL-Northern Brevard County FL-
726 PM EDT Thu May 21 2020

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BREVARD COUNTY UNTIL 800
PM EDT...

At 726 PM EDT, Doppler radar was tracking a strong thunderstorm over
Cocoa. This storm was nearly stationary.

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

Locations impacted include...
Rockledge, Cocoa, Cocoa Beach, Cape Canaveral and Merritt Island.

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 2845 8050 2839 8056 2834 8057 2828 8056
      2826 8086 2835 8086 2839 8089 2841 8088
      2843 8090 2845 8089 2845 8090 2847 8090
      2847 8087 2849 8088 2850 8088 2852 8051
      2847 8050
TIME...MOT...LOC 2326Z 273DEG 2KT 2839 8078

Combs

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 3:17 AM EDT	Rip Current Statement	MLB	Volusia	41 hr
May 21, 2:43 PM EDT	Special Weather Statement	MLB	Martin	47 min
May 21, 3:09 PM EDT	Severe Thunderstorm Warning	MLB	Martin	30 min
May 21, 3:31 PM EDT	Special Weather Statement	MLB	Indian River, Saint Lucie	59 min
May 21, 4:01 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	12 min
May 21, 4:21 PM EDT	Special Weather Statement	MLB	Okeechobee	54 min
May 21, 4:39 PM EDT	Special Weather Statement	MLB	Sumter	36 min
May 21, 4:45 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	18 min
May 21, 5:09 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	19 min
May 21, 5:17 PM EDT	Special Weather Statement	MLB	Osceola	58 min
May 21, 5:27 PM EDT	Special Weather Statement	MLB	Lake	33 min
May 21, 5:34 PM EDT	Severe Thunderstorm Warning	MLB	Lake	26 min
May 21, 5:53 PM EDT	Special Weather Statement	MLB	Orange, Osceola	82 min
May 21, 6:12 PM EDT	Special Weather Statement	MLB	Indian River	33 min
May 21, 6:15 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	41 min
May 21, 6:34 PM EDT	Special Weather Statement	MLB	Osceola	41 min
May 21, 6:37 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	20 min
May 21, 6:52 PM EDT	Special Marine Warning	MLB		53 min
May 21, 7:14 PM EDT	Severe Thunderstorm Warning	MLB	Orange	21 min
May 21, 7:24 PM EDT	Special Weather Statement	MLB	Seminole	36 min
May 21, 7:26 PM EDT	Special Weather Statement	MLB	Brevard	34 min
May 21, 7:40 PM EDT	Special Weather Statement	MLB	Seminole	50 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.