Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Melbourne, FL

December 20, 2018Okeechobee County, Florida

NWS Melbourne, FL issued this special weather statement at Dec 20, 2018, 1:42 PM EST for Okeechobee 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
Dec 20, 2018, 1:42 PM EST (18:42 UTC)
Expired
Dec 20, 2018, 2:30 PM EST
In force
48 min
Issued by
NWS Melbourne, FL

County Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 76 km from the middle of the area, began a volume at 18:46 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, 6.7 hours before the alert went out and 119 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 2018-12-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 326 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 2018-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 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
326 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
174 m²/s²
0-3 km storm-relative helicity
231 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

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 Dec 20, 8:58 AM EST, 4 hours 44 minutes earlier.

Area forecast discussion, Dec 20, 8:58 AM EST, 4 hours 44 minutes before
Area Forecast Discussion
National Weather Service Melbourne FL
858 AM EST Thu Dec 20 2018

.UPDATE...
..Enhanced Risk of Severe Storms With Heavy Rains Over East Central
Florida Today...

Tornado Watch number 439 in place for all counties and adjacent
Atlantic waters through 4 PM, except Martin and St. Lucie
counties. Initial line of storms impacting the I-4 corridor
and metro Orlando through Volusia county this morning is just the
initial round of activity, which will continue to unfold during
the remainder of the afternoon.

All persons should remain alert to the changing conditions and be
prepared to move to a place of safety in a sturdy enclosed room if
a warning is issued for your location.

&&

.AVIATION...
Strong/gusty winds wl mix down to the surface through the day.
Periods of MVFR-brief IFR and brief convective wind gusts 30- 40kt
or higher are likely in scattered to numerous storms through
afternoon. Greater threat for storms south of KMCO as we head
into afternoon. May be a brief lull in the winds late day or
early evening, but after an expected squall line traverses the
area later today SWRLY winds will again pick up later this evening
and overnight as the pgrad tightens into Fri with frontal
passage.

Sustained winds could approach 25 kts at some TAF sites on Fri
possibly requiring an Airport Weather Warning (AWW) at KMCO/KORL and
KDAB airports.

&&

.MARINE...
Storm impacts will include frequent cloud to water lightning,
torrential downpours, hail, damaging wind gusts in excess of 50
kts, and/or waterspouts.

A Small Craft Advisory is in effect for all areas. A Gale Warning
will start at 15Z/10AM areawide as winds quickly increase to
25-30kts away from the coast with frequent gusts expected to Gale
Force through the remainder of the day and tonight. Seas will be
slower to build but will gradually increase to 5-7 ft near shore
and 8-11 ft offshore/Gulf Stream.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  76  62  65  43 / 100  70  40   0
MCO  75  62  63  45 / 100  70  40   0
MLB  80  62  64  46 / 100  80  40   0
VRB  82  63  65  45 /  90 100  40   0
LEE  73  63  63  42 / 100  70  50   0
SFB  75  60  65  43 / 100  70  50   0
ORL  76  61  64  45 / 100  70  50   0
FPR  81  62  65  44 /  90 100  40   0

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...Lake Wind Advisory until 6 PM EST this evening for Coastal
     Volusia County-Indian River-Inland Volusia County-Martin-
     Northern Brevard County-Okeechobee-Orange-Osceola-Seminole-
     Southern Brevard County-St. Lucie.

     Tornado Watch until 4 PM EST this afternoon for Coastal Volusia
     County-Indian River-Inland Volusia County-Northern Brevard
     County-Northern Lake County-Okeechobee-Orange-Osceola-
     Seminole-Southern Brevard County-Southern Lake County.

AM...Tornado Watch until 4 PM EST this afternoon for Flagler Beach to
     Volusia-Brevard County Line 0-20 nm-Volusia-Brevard County
     Line to Sebastian Inlet 0-20 nm.

     Small Craft Advisory until 10 AM EST this morning for Flagler
     Beach to Volusia-Brevard County Line 0-20 nm-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 0-20
     nm-Volusia-Brevard County Line to Sebastian Inlet 20-60 nm.

     Gale Warning until 4 AM EST Saturday for Flagler Beach to
     Volusia-Brevard County Line 0-20 nm-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 0-20
     nm-Volusia-Brevard County Line to Sebastian Inlet 20-60 nm.

&&

JP/AC/KR
Hazardous weather outlook, Dec 20, 1:30 PM EST, 12 minutes before
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In the hours before

Special weather statement, Dec 20, 9:14 AM EST, 4 hours 28 minutes before
Special Weather Statement
National Weather Service Melbourne FL
914 AM EST THU DEC 20 2018

FLZ041-044>046-053-141-201515-
Northern Lake County FL-Coastal Volusia FL-Osceola FL-Orange FL-
Seminole FL-Inland Volusia FL-
914 AM EST THU DEC 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR SEMINOLE...NORTHEASTERN LAKE...
WESTERN ORANGE...VOLUSIA AND NORTHWESTERN OSCEOLA COUNTIES UNTIL 1015
AM EST...

At 912 AM EST, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles northeast of Paisley to near Cassia to
near Haines City. Movement was northeast at 50 mph.

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

Locations impacted include...
Orlando, Deltona, Daytona Beach, Kissimmee and Port Orange.

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.

These storms may intensify, or produce a rapid spinup and brief
tornado touchdown at short notice! Be certain to monitor local
radio stations and available television stations for additional
information and possible warnings from the National Weather Service.

&&

A Tornado Watch remains in effect until 400 PM EST for east central
Florida.

LAT...LON 2943 8107 2925 8098 2847 8116 2815 8152
      2820 8152 2826 8156 2826 8164 2879 8148
      2908 8154 2932 8142 2926 8142 2927 8115
      2941 8116
TIME...MOT...LOC 1412Z 214DEG 54KT 2907 8149 2885 8144 2810 8166

Cristaldi
Local storm report, Dec 20, 9:16 AM EST, 4 hours 26 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED
National Weather Service Melbourne FL
916 AM EST THU DEC 20 2018

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

0843 AM     TSTM WND GST     LEESBURG AIRPORT        28.82N 81.81W
12/20/2018  M52.00 MPH       Lake               FL   ASOS

            KLEE ASOS MEASURED WIND GUST OF 45KT/52MPH FROM SE

&&

JRS
Special weather statement, Dec 20, 10:18 AM EST, 3 hours 24 minutes before
Special Weather Statement
National Weather Service Melbourne FL
1018 AM EST THU DEC 20 2018

FLZ041-045-046-053-141-201615-
Coastal Volusia FL-Osceola FL-Orange FL-Seminole FL-
Inland Volusia FL-
1018 AM EST THU DEC 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR SEMINOLE...SOUTHEASTERN ORANGE...
CENTRAL VOLUSIA AND NORTH CENTRAL OSCEOLA COUNTIES UNTIL 1115 AM
EST...

At 1017 AM EST, Doppler radar was tracking strong thunderstorms along
a line extending from near Ormond-By-the-Sea to 6 miles west of
Daytona International Speedway to near DeBary to Goldenrod to 6 miles
southeast of Poinciana. Movement was northeast at 35 mph.

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

Locations impacted include...
Orlando, Deltona, Daytona Beach, Kissimmee and Port Orange.

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.

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.

&&

A Tornado Watch remains in effect until 400 PM EST for east central
Florida.

LAT...LON 2943 8107 2908 8089 2879 8094 2879 8097
      2818 8106 2793 8128 2793 8133 2804 8146
      2806 8146 2801 8138 2808 8135 2809 8145
      2814 8146 2856 8137 2885 8138 2911 8124
      2926 8121 2927 8115 2941 8116
TIME...MOT...LOC 1517Z 215DEG 28KT 2935 8112 2917 8117 2888 8128 2863
8129 2810 8138

Cristaldi
Local storm report, Dec 20, 12:32 PM EST, 1 hour 10 minutes before
PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
1232 PM EST THU DEC 20 2018

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

0936 AM     TSTM WND DMG     4 S LAKE GRIFFIN        28.79N 81.84W
12/20/2018                   Lake               FL   EMERGENCY MNGR

            EM REPORTS ALUMINUM PORCH ROOF BLOWN OFF OF A RESIDENTIAL
            STRUCTURE. PHOTOS SHARED VIA TWITTER FROM LOCAL MEDIA.

&&

JRS
Local storm report, Dec 20, 1:30 PM EST, 12 minutes before
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Special weather statement, Dec 20, 1:42 PM EST, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 3:46 AM ESTGale WarningMLB48 hr
Dec 20, 4:12 AM ESTBeach Hazards StatementMLBVolusia14 hr
Dec 20, 4:15 AM ESTLake Wind AdvisoryMLBOkeechobee, Orange, Osceola, Seminole, Volusia14 hr
Dec 20, 8:17 AM ESTSpecial Weather StatementMLBLake58 min
Dec 20, 8:23 AM ESTTornado WarningMLBLake, Orange22 min
Dec 20, 9:14 AM ESTSpecial Weather StatementMLBOrange, Seminole, Volusia61 min
Dec 20, 9:25 AM ESTTornado WarningMLBOrange35 min
Dec 20, 9:37 AM ESTSpecial Marine WarningMLB3 hr
Dec 20, 10:00 AM ESTAreal Flood AdvisoryMLBLake, Orange, Osceola, Seminole, Volusia2 hr
Dec 20, 10:18 AM ESTSpecial Weather StatementMLBOrange, Seminole, Volusia57 min
Dec 20, 10:46 AM ESTTornado WarningMLBSeminole, Volusia29 min
Dec 20, 11:01 AM ESTTornado WarningMLBVolusia29 min
Dec 20, 11:24 AM ESTTornado WarningMLBVolusia19 min
Dec 20, 11:35 AM ESTSevere Thunderstorm WarningMLBBrevard, Orange, Osceola, Seminole, Volusia55 min
Dec 20, 12:02 PM ESTTornado WarningMLBBrevard, Seminole, Volusia28 min
Dec 20, 12:21 PM ESTAreal Flood AdvisoryMLBBrevard, Lake, Orange, Osceola, Seminole, Volusia3 hr
Dec 20, 12:25 PM ESTSpecial Marine WarningMLB110 min
Dec 20, 12:33 PM ESTSevere Thunderstorm WarningMLBBrevard, Seminole, Volusia27 min
Dec 20, 12:57 PM ESTSevere Thunderstorm WarningMLBBrevard, Orange, Osceola63 min
Dec 20, 2:02 PM ESTSpecial Marine WarningMLB3 hr
Dec 20, 2:05 PM ESTSpecial Weather StatementMLBBrevard25 min
Dec 20, 2:19 PM ESTSpecial Marine WarningMLB3 hr
Dec 20, 2:25 PM ESTSevere Thunderstorm WarningMLBBrevard27 min
Dec 20, 2:59 PM ESTSpecial Weather StatementMLBIndian River, Martin, Saint Lucie61 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.