Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Melbourne, FL

December 20, 2018Orange County, Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this special weather statement at Dec 20, 2018, 9:14 AM EST for Orange County, Seminole County, Volusia County, Florida. It was in force for 61 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, 9:14 AM EST (14:14 UTC)
Expired: Dec 20, 2018, 10:15 AM EST
In force: 61 min
Issued by: NWS Melbourne, FL

Counties Orange County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 110 km from the middle of the area, began a volume at 14:16 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, 2.2 hours before the alert went out and 94 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: 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, 16 minutes earlier.

Area forecast discussion, Dec 20, 8:58 AM EST, 16 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, 8:05 AM EST, 1 hour 9 minutes before

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In the hours before

Special weather statement, Dec 20, 8:17 AM EST, 57 minutes before

Special Weather Statement
National Weather Service Melbourne FL
817 AM EST THU DEC 20 2018

FLZ041-044>046-053-144-201415-
Northern Lake County FL-Osceola FL-Orange FL-Seminole FL-
Inland Volusia FL-Southern Lake County FL-
817 AM EST THU DEC 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SEMINOLE...LAKE...
WESTERN ORANGE...NORTHWESTERN VOLUSIA AND NORTHWESTERN OSCEOLA
COUNTIES UNTIL 915 AM EST...

At 816 AM EST, Doppler radar was tracking strong thunderstorms along
a line extending from near Wildwood to near Mascotte to 9 miles
southwest of Lake Louisa to 14 miles west of Four Corners to near
Combee Settlement. Movement was northeast at 50 mph.

Wind gusts 40 to 50 mph will be possible with these storms. The
atmospehere is primed for storms to acquire rotation quickly! Be
prepared to act quickly should a Tornado Warning be issued!

Locations impacted include...
Orlando, Apopka, Ocoee, Winter Garden and Leesburg.

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.

&&

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

LAT...LON 2896 8195 2896 8166 2928 8164 2932 8168
      2940 8142 2904 8137 2885 8138 2825 8155
      2826 8166 2835 8166 2835 8179 2836 8179
      2835 8191 2852 8195
TIME...MOT...LOC 1316Z 222DEG 42KT 2881 8205 2853 8191 2842 8187 2829
8188 2811 8194

Cristaldi

Local storm report, Dec 20, 8:49 AM EST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
849 AM EST THU DEC 20 2018

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

0840 AM     TSTM WND GST     LEESBURG AIRPORT        28.82N 81.81W
12/20/2018  M45 MPH          LAKE               FL   ASOS

            KLEE ASOS MEASURED WIND GUST OF 39KT/45MPH FROM SE

&&

JRS

Local storm report, Dec 20, 9:05 AM EST, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Melbourne FL
905 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  M48 MPH          LAKE               FL   ASOS

            KLEE ASOS MEASURED WIND GUST OF 42KT/48MPH FROM S

&&

JRS

Special weather statement, Dec 20, 9:14 AM EST, 0 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

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 3:46 AM EST	Gale Warning	MLB		48 hr
Dec 20, 4:12 AM EST	Beach Hazards Statement	MLB	Volusia	14 hr
Dec 20, 4:15 AM EST	Lake Wind Advisory	MLB	Okeechobee, Orange, Osceola, Seminole, Volusia	14 hr
Dec 20, 8:17 AM EST	Special Weather Statement	MLB	Lake	58 min
Dec 20, 8:23 AM EST	Tornado Warning	MLB	Lake, Orange	22 min
Dec 20, 9:25 AM EST	Tornado Warning	MLB	Orange	35 min
Dec 20, 9:37 AM EST	Special Marine Warning	MLB		3 hr
Dec 20, 10:00 AM EST	Areal Flood Advisory	MLB	Lake, Orange, Osceola, Seminole, Volusia	2 hr
Dec 20, 10:18 AM EST	Special Weather Statement	MLB	Orange, Seminole, Volusia	57 min
Dec 20, 10:46 AM EST	Tornado Warning	MLB	Seminole, Volusia	29 min
Dec 20, 11:01 AM EST	Tornado Warning	MLB	Volusia	29 min
Dec 20, 11:24 AM EST	Tornado Warning	MLB	Volusia	19 min
Dec 20, 11:35 AM EST	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola, Seminole, Volusia	55 min
Dec 20, 12:02 PM EST	Tornado Warning	MLB	Brevard, Seminole, Volusia	28 min
Dec 20, 12:21 PM EST	Areal Flood Advisory	MLB	Brevard, Lake, Orange, Osceola, Seminole, Volusia	3 hr
Dec 20, 12:25 PM EST	Special Marine Warning	MLB		110 min
Dec 20, 12:33 PM EST	Severe Thunderstorm Warning	MLB	Brevard, Seminole, Volusia	27 min
Dec 20, 12:57 PM EST	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola	63 min
Dec 20, 1:42 PM EST	Special Weather Statement	MLB	Okeechobee	48 min
Dec 20, 2:02 PM EST	Special Marine Warning	MLB		3 hr
Dec 20, 2:05 PM EST	Special Weather Statement	MLB	Brevard	25 min
Dec 20, 2:19 PM EST	Special Marine Warning	MLB		3 hr
Dec 20, 2:25 PM EST	Severe Thunderstorm Warning	MLB	Brevard	27 min
Dec 20, 2:59 PM EST	Special Weather Statement	MLB	Indian River, Martin, Saint Lucie	61 min

Nearby

Special Weather Statements in Florida, 2018 Every 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.