Alert archive / Florida / Wind Chill Advisories in 2012

Wind Chill Advisory 2, NWS Melbourne, FL

February 11, 20126 counties in Florida

NWS Melbourne, FL issued this wind chill advisory at Feb 11, 2012, 4:30 AM EST for 6 counties in Florida. It took effect at Feb 12, 2012, 4:00 AM EST. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Feb 11, 2012, 4:30 AM EST (09:30 UTC)
In effect from
Feb 12, 2012, 4:00 AM EST
Expired
Feb 12, 2012, 9:00 AM EST
In force
5 hr
Issued by
NWS Melbourne, FL

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

The radar

The Melbourne radar (KMLB), 67 km from the middle of the area, began a volume at 09:33 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

Tampa Bay, FL (KTBW), launched 00:00Z, 9.5 hours before the alert went out and 139 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, Tampa Bay, FL at 00:00Z on 2012-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 507 joules per kilogram.LCLLFCEL10008507005003002001001 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, Tampa Bay, FL at 00:00Z on 2012-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897117Sfc1 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
507 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.4
Supercell composite
1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

402 
WWUS42 KMLB 110930
WSWMLB

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MELBOURNE FL
430 AM EST SAT FEB 11 2012

FLZ041-044>047-053-054-058-059-064-141-144-147-121400-
/O.NEW.KMLB.WC.Y.0002.120212T0900Z-120212T1400Z/
INLAND VOLUSIA-NORTHERN LAKE-ORANGE-SEMINOLE-SOUTHERN BREVARD-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-COASTAL VOLUSIA-
SOUTHERN LAKE-NORTHERN BREVARD-
INCLUDING THE CITIES OF...DE LAND...LEESBURG...ORLANDO...
SANFORD...MELBOURNE...PALM BAY...KISSIMMEE...ST CLOUD...
VERO BEACH...OKEECHOBEE...FORT PIERCE...HOBE SOUND...
DAYTONA BEACH...CLERMONT...TITUSVILLE
430 AM EST SAT FEB 11 2012

...WIND CHILL ADVISORY IN EFFECT FROM 4 AM TO 9 AM EST SUNDAY...

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A WIND CHILL
ADVISORY...WHICH IS IN EFFECT FROM 4 AM TO 9 AM EST SUNDAY. 

* NORTHWEST WINDS AROUND 10 TO 15 MPH OVERNIGHT WILL COMBINE WITH
  CHILLY OVERNIGHT TEMPERATURES TO PRODUCE WIND CHILL VALUES NEAR
  OR BELOW FREEZING FOR ALL OF EAST CENTRAL FLORIDA. WIND CHILL
  VALUES WILL RANGE FROM THE UPPER 20S ACROSS THE INTERIOR TO THE
  LOW 30S ALONG THE COASTAL AREAS OF THE SPACE AND TREASURE
  COASTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT COLD AIR AND STRONG WINDS WILL
COMBINE TO GENERATE LOW WIND CHILLS. IF YOU MUST VENTURE
OUTDOORS...DRESS WARMLY IN LAYERS AND MAKE SURE YOU WEAR A HAT
AND GLOVES.

&&

$$
1 follow-up statement
087 
WWUS42 KMLB 112137
WSWMLB

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MELBOURNE FL
437 PM EST SAT FEB 11 2012

FLZ041-044>047-053-054-058-059-064-141-144-147-121400-
/O.CON.KMLB.WC.Y.0002.120212T0900Z-120212T1400Z/
INLAND VOLUSIA-NORTHERN LAKE-ORANGE-SEMINOLE-SOUTHERN BREVARD-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-COASTAL VOLUSIA-
SOUTHERN LAKE-NORTHERN BREVARD-
INCLUDING THE CITIES OF...DE LAND...LEESBURG...ORLANDO...
SANFORD...MELBOURNE...PALM BAY...KISSIMMEE...ST CLOUD...
VERO BEACH...OKEECHOBEE...FORT PIERCE...HOBE SOUND...
DAYTONA BEACH...CLERMONT...TITUSVILLE
437 PM EST SAT FEB 11 2012

...WIND CHILL ADVISORY REMAINS IN EFFECT FROM 4 AM TO 9 AM EST
SUNDAY...

* NORTHWEST WINDS AROUND 10 TO 15 MPH OVERNIGHT WILL COMBINE WITH
  CHILLY OVERNIGHT TEMPERATURES TO PRODUCE WIND CHILL VALUES NEAR
  OR BELOW FREEZING FOR ALL OF EAST CENTRAL FLORIDA. WIND CHILL
  VALUES WILL RANGE FROM THE LOW TO MID 20S ACROSS THE INTERIOR
  TO THE LOW 30S ALONG THE COASTAL AREAS OF THE SPACE AND TREASURE
  COASTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT COLD AIR AND STRONG WINDS WILL
COMBINE TO GENERATE LOW WIND CHILLS. IF YOU MUST VENTURE
OUTDOORS...DRESS WARMLY IN LAYERS AND MAKE SURE YOU WEAR A HAT
AND GLOVES.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 10, 11:23 PM ESTSpecial Marine WarningMLB72 min
Feb 11, 3:58 AM ESTLake Wind AdvisoryMLBLake, Okeechobee, Orange, Osceola, Seminole, Volusia14 hr
Feb 11, 4:44 AM ESTSmall Craft AdvisoryMLB38 hr
Feb 11, 12:30 PM ESTFreeze WarningMLBLake, Orange, Seminole, Volusia21 hr
Feb 11, 3:08 PM ESTFire Weather WatchMLBLake, Orange, Osceola, Seminole, Volusia36 hr
Feb 11, 3:08 PM ESTRed Flag WarningMLBLake, Okeechobee, Orange, Osceola, Seminole, Volusia28 hr
Feb 11, 3:21 PM ESTFreeze WatchMLBLake, Orange, Seminole, Volusia23 hr
Feb 11, 3:41 PM ESTGale WarningMLB15 hr

Nearby

Wind Chill Advisories in Florida, 2012Every wind chill advisory in 2012

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.