Alert archive / Florida / Red Flag Warnings in 2017

Red Flag Warning 4, NWS Melbourne, FL

March 20, 2017Seminole County, Florida

NWS Melbourne, FL issued this red flag warning at Mar 20, 2017, 9:12 AM EDT for Seminole County, Florida. It took effect at Mar 20, 2017, 12:00 PM EDT. It was in force for 7 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 20, 2017, 9:12 AM EDT (13:12 UTC)
In effect from
Mar 20, 2017, 12:00 PM EDT
Expired
Mar 20, 2017, 7:00 PM EDT
In force
7 hr
Issued by
NWS Melbourne, FL

County Seminole County, FL

The radar

The Melbourne radar (KMLB), 88 km from the middle of the area, began a volume at 13:11 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, 1.2 hours before the alert went out and 77 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 2017-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 2017-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -76 square meters per square second.193958Sfc1 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
2 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1202 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-76 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

202 
WWUS82 KMLB 201312
RFWMLB

URGENT - FIRE WEATHER MESSAGE
National Weather Service Melbourne FL
912 AM EDT Mon Mar 20 2017

FLZ046-202300-
/O.NEW.KMLB.FW.W.0004.170320T1600Z-170320T2300Z/
Seminole-
912 AM EDT Mon Mar 20 2017

...RED FLAG WARNING IN EFFECT FROM 12 PM THIS AFTERNOON UNTIL 7 
PM EDT THIS EVENING FOR LONG DURATION OF LOW RELATIVE HUMIDITY AND
HIGH ERC VALUES FOR SEMINOLE COUNTY...

The National Weather Service in Melbourne has issued a Red Flag
Warning, which is in effect from 12 PM this afternoon until 7 PM 
EDT this evening.


* AFFECTED AREA... Seminole County.

* WIND...Northeast around 5 to 10 mph. 

* HUMIDITY...Minimum values 29 to 34 percent. 

* IMPACTS...any fires that develop will likely 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
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

Nearby

Red Flag Warnings in Florida, 2017Every red flag warning in 2017

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.