Alert archive / Florida / Frost Advisories in 2021

Frost Advisory 3, NWS Melbourne, FL

January 18, 2021Lake County, Volusia County, Florida

NWS Melbourne, FL issued this frost advisory at Jan 18, 2021, 1:39 PM EST for Lake County, Volusia County, Florida. It took effect at Jan 19, 2021, 5:00 AM EST. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 18, 2021, 1:39 PM EST (18:39 UTC)
In effect from
Jan 19, 2021, 5:00 AM EST
Expired
Jan 19, 2021, 8:00 AM EST
In force
3 hr
Issued by
NWS Melbourne, FL

Counties Lake County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 117 km from the middle of the area, began a volume at 18:44 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 103 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 2021-01-18Temperature 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°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 2021-01-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939587897117136156Sfc1 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
1106 m above ground
0-6 km bulk shear
90 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

553 
WWUS72 KMLB 181839
NPWMLB

URGENT - WEATHER MESSAGE
National Weather Service Melbourne FL
139 PM EST Mon Jan 18 2021

FLZ041-044-191300-
/O.NEW.KMLB.FR.Y.0003.210119T1000Z-210119T1300Z/
Inland Volusia-Northern Lake-
Including the cities of Debary, Deland, Deltona, Eustis, 
Mount Dora, Leesburg, and Tavares
139 PM EST Mon Jan 18 2021

...FROST ADVISORY IN EFFECT FROM 5 AM TO 8 AM EST TUESDAY...

* WHAT...Low temperatures between 33 and 36 will result in frost 
  formation late tonight.

* WHERE...Inland Volusia and Northern Lake Counties.

* WHEN...From 5 AM to 8 AM EST Tuesday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Nearby

Frost Advisories in Florida, 2021Every frost advisory in 2021

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.