Ham Radio Operations at
National Weather
Service Melbourne (MLB)
![Image of the ham radio at the office](images/jpg/ham2.jpg)
During March 1998, NWS MLB applied for, and received an amateur
radio (ham) "club" license and "vanity" call-sign (WX4MLB).
Unlike CB radio, ham radio operators must have an FCC license to operate. While there are several radio
spectrum "bands" (e.g. 2, 10, 15, 20, 40, 80 meters) that hams can use
depending on their particular license class (technician, general,
extra) and communication needs (distance), all SKYWARN operations from NWS MLB are
currently conducted on 2 meters
(VHF, 144-148 MHz). These frequencies are just below the marine radio spectrum
(156-158 MHz) and NOAA Weather Radio (NWR) frequencies (162 MHz), and allow
communication throughout east central Florida. An HF radio is also available
when longer distance communication is required, primarily for hurricane
situations and when emergency back-up is required between NWS Melbourne and NWS
San Juan, Puerto Rico. Within the NWS Melbourne SKYWARN cubicle, there are two Kenwood 2-meter transceivers
(see picture above). The radio on the left remains on a frequency of 144.390
to support APRS (a type of "packet" system which provides weather observations
from area hams and displays them on the PC below the radios). The radio
on the right is used for SKYWARN, and is tuned to certain frequencies depending
on what geographic areas severe weather is expected. There are three antennas available for the Kenwood
radios. Two
antennas are omni-directional (Ringo Ranger, G6 Hustler) and one is a uni-directional
(beam) antenna. Typically, the Ringo Ranger remains attached to the APRS
Kenwood, and the beam remains attached to the SKYWARN Kenwood. The HF radio is
an Icon 746Pro and permanent antennas consist of Carolina Windom and a G5RV
5-band dipole. The goals of SKYWARN operations are two-fold; 1) to
provide
information to the hams concerning the potential for
severe weather so they can prepare themselves and others and 2) to receive
severe weather reports
from the hams to assist with issuance/extension
of warnings/statements/advisories etc. Many SKYWARN hams operate from remote
areas (home stations or in vehicles) and/or have access to other communication
networks to relay information.
Hams can often provide real-time reports
of damaging weather. For example, when an F2 tornado struck Barefoot Bay
during Tropical Storm Gordon (1994), hams relayed a report while the tornado
was on the ground. Confirmation from an official source didn't reach the
office until over 30 minutes later! Another good example was during the
devastating tornado outbreak of 22-23 February 1998, when hams provided
extremely timely, first-hand reports of tornadoes, extreme damage, and people trapped within
buildings.
Long standing and excellent relationships exist between NWS
Melbourne and the SKYWARN
groups within east central Florida. Each individual county has an active communication
network and operates SKYWARN networks (nets) on frequencies determined
by nearby "repeaters." Repeaters are basically radio stations which use
tall antennas to receive signals, then retransmit the signal so they can
be heard over wider geographic ranges.
Eight staff members at NWS MLB have ham radio licenses (see
table below). Before or during severe weather episodes, if time permits, these
hams may ask for weather reports, for example:
This is WX4MLB at the
National Weather Service in Melbourne. Weather radar indicates a strong
thunderstorm developing along the sea breeze over Cocoa. The storm will likely
move south into Viera, Suntree, and Melbourne and may intensify
to a severe storm in the next half hour. WX4MLB will continue to monitor
this frequency for any reports. NWS MLB staff may also
request for SKYWARN activation.
Pete Blottman |
N2RFW |
Tony Cristaldi |
KB2SIT |
Dennis Decker |
KB4TYM |
John Pendergrast |
KC5SVA |
Tim Sedlock |
KD7ZDC |
Scott Spratt |
KT4PD |
Mike Turner |
KG4YRC |
Derrick Weitlich |
W1DKW |
Once per year, during the first weekend in December, a
24-hour communications test is conducted for SKYWARN operations at NWS offices
throughout the country. Temporary antennas, and numerous transmitter locations
are set up at each office, often with emergency power generators. Large groups
of hams then make contacts with other radio operators throughout the world (see
the results from the 2007 SKYWARN Recognition Day at NWS Melbourne).
There are four general
types of Severe Weather SKYWARN activation used by NWS Melbourne:
(1) Informal
Activation - This may be requested by WFO MLB when marginal
severe weather is expected or a pulse storm (i.e. short duration) may affect
a given county. In this situation, WFO MLB will contact designated county radio
communicators,
and request them to solicit reports, but not to "take over" the frequency
from normal ham radio use. With informal activation, reports can still be received AND
hams can use their repeaters for non-weather communications as well. Sometimes,
NWS Melbourne hams will tune to a desired frequency
when a short-lived/pulse storm is imminent and query anyone on frequency for
reports of severe weather.
(2) Self
Activation (formal) - Most SKYWARN hams follow the weather
and NWS forecasts closely on a daily basis. If severe weather is imminent,
they will often activate their nets by themselves. If they receive a severe
report, they will call the NWS and relay the information. Requests for "Self Activation"
are indicated within NWS MLB
Hazardous Weather
Outlooks (HWO).
The HWO are available on the Internet and are broadcast upon NOAA Weather Radio
(NWR). An example of a call-to-action would be "HAM RADIO OPERATORS
ARE ASKED TO SELF ACTIVATE SKYWARN NETS TONIGHT WHEN SEVERE WEATHER BECOMES
IMMINENT FOR THEIR COUNTIES." This is the most
common type of activation.
(3) Requested
Activation (formal) - This would be a situation when meteorologists
are fairly confident a severe weather episode is going to occur over
a portion of east central Florida. Generally, 6-12 hours ahead of the event, contacts
are made with hams in each county severe weather
is expected to verify that they are ready and will activate in advance.
During these situations, the hams may make occasional notifications on their repeators
indicating the expected timing/severity of the approaching system. This
type of activation typically occurs less than a half-dozen times per year.
(4) Request for hams to operate
SKYWARN from WFO MLB - An agreement has been made between NWS
Melbourne and the Brevard County Amateur Radio Service (BEARS) for one or more
of their members of their group to be detailed to the weather office to assist with communications
during a significant severe weather outbreak or a hurricane landfall. Generally, operators
will be requested if forecasters are highly confident that significant or
widespread severe weather will occur for more than a
few hours and office manpower will be too busy with forecasts/warnings to
operate the radio. This
type of activation typically occurs only 2-4 times per year and usually
occurs in conjunction with (3), above.
Click here for current
activation level |