Alert archive / Florida / Red Flag Warnings in 2017

Red Flag Warning 21, NWS Tampa Bay, FL

May 18, 2017Levy County, Florida

NWS Tampa Bay, FL issued this red flag warning at May 18, 2017, 3:06 AM EDT for Levy County, Florida. It took effect at May 18, 2017, 2:00 PM EDT. It was in force for 5 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
May 18, 2017, 3:06 AM EDT (07:06 UTC)
In effect from
May 18, 2017, 2:00 PM EDT
Expired
May 18, 2017, 7:00 PM EDT
In force
5 hr
Issued by
NWS Tampa Bay, FL

County Levy County, FL

The radar

The Jacksonville radar (KJAX), 170 km from the middle of the area, began a volume at 07:07 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

Jacksonville, FL (KJAX), launched 00:00Z, 7.1 hours before the alert went out and 171 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, Jacksonville, FL at 00:00Z on 2017-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 223 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, Jacksonville, FL at 00:00Z on 2017-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
223 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

780 
WWUS82 KTBW 180706
RFWTBW

URGENT - FIRE WEATHER MESSAGE
National Weather Service Tampa Bay Area - Ruskin FL
306 AM EDT Thu May 18 2017

...RED FLAG WARNING IN EFFECT TODAY FOR LONG DURATIONS OF 
HUMIDITY VALUES BELOW 35 PERCENT AND HIGH ERC VALUES...

.High pressure will support hot and dry conditions over the 
region today with some record high temperatures possible. Long 
durations of humidity values below 35 percent combined with high 
ERC values will support red flag conditions over inland Levy 
county this afternoon.

FLZ239-182300-
/O.NEW.KTBW.FW.W.0021.170518T1800Z-170518T2300Z/
Inland Levy-
306 AM EDT Thu May 18 2017

...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON UNTIL 7 PM
EDT THIS EVENING FOR LONG DURATIONS OF HUMIDITY VALUES BELOW 35 
PERCENT AND HIGH ERC VALUES...

The National Weather Service in Tampa Bay Area - Ruskin FL has
issued a Red Flag Warning, which is in effect from 2 PM this
afternoon until 7 PM EDT this evening. 

* AFFECTED AREA...Inland Levy.

* WIND...East winds 10 to 15 mph.

* HUMIDITY...30 to 32 percent.

* ERC...38

* 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.