Alert archive / Florida / Red Flag Warnings in 2018

Red Flag Warning 6, NWS Melbourne, FL

March 15, 20184 counties in Florida

NWS Melbourne, FL issued this red flag warning at Mar 15, 2018, 3:40 AM EDT for 4 counties in Florida. It took effect at Mar 15, 2018, 12:00 PM EDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 15, 2018, 3:40 AM EDT (07:40 UTC)
In effect from
Mar 15, 2018, 12:00 PM EDT
Expired
Mar 15, 2018, 8:00 PM EDT
In force
8 hr
Issued by
NWS Melbourne, FL

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

The radar

The Melbourne radar (KMLB), 76 km from the middle of the area, began a volume at 07:41 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 00:00Z, 7.7 hours before the alert went out and 71 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 00:00Z on 2018-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cape Canaveral, FL at 00:00Z on 2018-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2134 m above ground
0-6 km bulk shear
86 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

063 
WWUS82 KMLB 150740
RFWMLB

URGENT - FIRE WEATHER MESSAGE
National Weather Service Melbourne FL
340 AM EDT Thu Mar 15 2018

...Very dry air and dry vegetation will again contribute to a high
fire danger...

FLZ041-045>047-053-054-141-147-160000-
/O.NEW.KMLB.FW.W.0006.180315T1600Z-180316T0000Z/
Inland Volusia County-Orange-Seminole-Southern Brevard County-
Osceola-Indian River-Coastal Volusia County-
Northern Brevard County-
340 AM EDT Thu Mar 15 2018

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING FOR LONG DURATION OF LOW RELATIVE HUMIDITY AND DRY
VEGETATION WITH HIGH ENERGY RELEASE COMPONENT VALUES...

The National Weather Service in Melbourne has issued a Red Flag 
Warning, which is in effect from noon today to 8 PM EDT this 
evening. 

* AFFECTED AREA... Inland Volusia County... Orange... Seminole...
   Southern Brevard County... Osceola... Indian River... Coastal 
  Volusia County... Northern Brevard County. 

* HUMIDITY...Min Humidity 15 to 20 percent this afternoon.

* IMPACTS...any fires that develop could spread rapidly. Outdoor 
  burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of 
low relative humidity...dry vegetation and warming temperatures 
can contribute to extreme fire behavior.

&&

$$

Sedlock

What forecasters said that day

The local office's own words before this red flag 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 red flag warning went out at Mar 14, 9:20 PM EDT, 6 hours 20 minutes earlier.

Area forecast discussion, Mar 14, 9:20 PM EDT, 6 hours 20 minutes before
East Central Florida Forecast Discussion
National Weather Service Melbourne FL
920 PM EDT Wed Mar 14 2018

.DISCUSSION...
Cold high pressure has settled over the state and mid 30s along
with possibility of patchy frost are forecast once again for coldest
northern locations for the first time in awhile. U30s are forecast
as well over a larger inland coverage southward to Okeechobee county
with optimal cooling. Higher dewpoint readings ascd with earlier
onshore sea breeze have manifest along the immediate Space/Treasure
Coasts and expected overnight readings along the immediate coast in
these areas will be adjusted upward to around 40 degrees or higher
the remainder of the night.

The afternoon sea breeze made progress to inland locations by
sunset, however it was quite dry for the whole area this afternoon
with a few brush fires cropping up in the dry afternoon conditions.
A repeat is expected again on Thursday with very low humidity once
again.

...prev disc...
The main forecast problem is frost potential in the pre-dawn hours.
MOS shows a rather large temperature/dew point spread then, but
that guidance is for wide open airports. Noticed that a few wind
protected spots around the Ocala National Forest had much lower
dew point depressions this morning, and boundary layer winds will
be lighter Thu morning. Therefore, have included mention of patchy
frost for north Lake and interior Volusia counties where min
temps in the mid-upper 30s are forecast.

&&

.AVIATION...VFR.

&&

.MARINE...Winds should drop off to 10-15 knots.  Seas should
continue near 6 feet in the Gulf Stream, so will retain an exercise
caution statement there.  A high pressure ridge will build across
the peninsula from the Gulf of Mexico on Thu, diminishing winds
below 10 knots with seas subsiding to 3-4 feet.

&&

.FIRE WEATHER...
Thu...A high pressure ridge will build across the area from the Gulf
of Mexico.  This will diminish winds below 10 mph, but very low RH
will occur in the afternoon, with some interior spots likely
having minimum values 15-20 percent. Coastal sections will have a
sea breeze develop, but the very dry air mass will still allow for
some duration of RH below 35 percent there too. ERC values in
the Upper 30s and higher in some spots will likely require
issuance of a Warning for a portion of the region early on Thursday.

&&

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

&&

JP/JS
Hazardous weather outlook, Mar 14, 8:26 PM EDT, 7 hours 14 minutes before
Hazardous Weather Outlook
National Weather Service Melbourne FL
826 PM EDT Wed Mar 14 2018

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-151230-
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 County-
Northern Lake County-Orange-Seminole-Southern Brevard County-
Osceola-Indian River-Okeechobee-St. Lucie-Martin-
Coastal Volusia County-Southern Lake County-
Northern Brevard County-
826 PM EDT Wed Mar 14 2018

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TONIGHT.

.WIND AND SEA IMPACT...
Winds will continue to diminish through tonight, but seas will
remain elevated near 6 feet in the Gulf Stream waters. Small craft
should exercise caution if in the offshore waters.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
Rainfall forecast remains near zero until late into the weekend,
therefore fire weather concerns will continue. Critically low
relative humidity tomorrow will contribute to additional
vegetative drying and a Very High fire weather risk. A northeast
swell across the local marine waters will promote an elevated rip
current threat at area beaches through late week.

.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed today.

Smith

Nearby

Red Flag Warnings in Florida, 2018Every red flag warning 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.