An Outlook is used to indicate that hazardous winter weather may develop. It is intended to
provide information to those who need considerable lead time to prepare for the event. A Winter
Storm Outlook is needed when there is 30% confidence that a hazardous winter weather event
could threaten life or property. This typically pertains to the day 3 through day 7 period- when
confidence in a warning event is usually quite low. Outlooks will normally be very broad- often
encompassing the entire forecast area unless there is very good reason to exclude any sections. The
Winter Storm Outlook information is disseminated through the Hazardous Weather Outlook
WFO GSP will issue winter weather Watches when conditions are favorable for a hazardous
winter weather event to develop over part, or all, of the forecast area, but the occurrence is
uncertain. This 50% confidence threshold is typically first met within 48 hours of an
approaching winter storm. Winter weather Watches are, thus, usually issued for events falling in
periods 2 through 4 of the current forecast cycle. Watches should usually encompass areas slightly
larger than the main winter event threat locations in order to allow for some uncertainty with the
forecast. Watches should also be issued as soon as confidence thresholds are met, and coordination
allows, in order to achieve the longest lead time possible.
WFO GSP will use CAEWSWGSP to issue the following types of Watch
Winter Storm Watch - Conditions are favorable for either heavy snow, heavy sleet,
damaging ice accumulations, or a combination of these factors, to develop within the next 48 hours.
For the GSP CWFA, heavy snow is defined as 3 inches accumulating across the foothills and piedmont
and 4 inches across the NC mountians in a 12-hour period, or 4 inches across the foothills and
piedmont and 5 inches across the NC mountains in a 24-hour period. Damaging ice accumulations
typically result from freezing rain accumulating 1/4 inch or more on exposed surface. It has been
locally determined that 1/2 inch of sleet is considered "heavy" for Watch and Warning
Wind Chill Watch - Conditions are favorable for wind chill temperatures to fall to
20 below zero in the mountains, or 15 below zero in the foothills and piedmont, within the next 48
Blizzard Watch - Conditions are favorable for a blizzard to develop within the next
48 hours. A blizzard is falling or blowing snow accompanied by frequent wind gusts to 35 mph or
greater, with visibility less than 1/4 mile for three hours or more.
Watches should be updated at least every 12 hours until a Warning or Advisory is issued, or
the Watch is cancelled.
WFO GSP will issue winter weather Warnings when there is an 80% or greater chance
a hazardous winter weather event meeting or exceeding local Warning criteria
WFO GSP will use CAEWSWGSP to issue the following types of Warning
- Sustained wind or frequent gusts greater than or equal to 35 mph
accompanied by falling and/or blowing snow, frequently reducing visibility to less than 1/4 mile for
three hours or more.
Ice Storm Warning
- Ice accumulation of 1/4 inch or more.
Winter Storm Warning
- Heavy winter weather event producing either:
a. Heavy snow accumulating 3 inches across the foothills and piedmont and
4 inches across the NC mountains in a 12-hour period, or 4 inches across the foothills and piedmont
or 5 inches across the NC mountains in a 24-hour period. Warnings are based on the average
value (rounded up to the nearest inch) of the forecast snowfall range.
b. Heavy sleet accumulating ½ inch or more.
c. A heavy mixed precipitation event in which snow, sleet, and/or ice
reach Warning criteria, or an event containing both winter weather and wind hazards in which weather
or wind Warning criteria are met.
Wind Chill Warning - Wind chill temperatures reaching or exceeding minus 20 in the
mountains, or minus 15 outside of the mountains.
WFO GSP can also issue Winter Warning products for events where objective Warning criteria
are not met if a significant public impact is expected, e.g. early season or holiday travel snow or
ice storms. Winter Weather Warnings must be updated at least once every 6 to 8 hours until the event
ends, or the Warning is cancelled.
WFO GSP will issue Winter Weather Advisories to provide advance notice of hazardous winter
weather which could lead to life-threatening situations if caution is not exercised.
WFO GSP will use CAEWSWGSP to issue the following types of Advisory
Freezing Rain Advisory - Light ice accumulations (from freezing rain or freezing
drizzle) totaling from a trace to less than 1/4 inch. In practice, a Freezing Rain Advisory should
be issued anytime freezing rain is occurring, or there is high confidence it will occur, and any
glazing of sidewalks, roadways, or bridges is expected.
Winter Weather Advisory - Hazardous winter weather event producing either:
a. Light snow accumulations of at least one inch, but less than Warning
criteria. Since snowfall amounts of ½ inch are rounded to an inch for reporting
purposes, snow advisories are appropriate for expected amounts of ½ inch or greater across
the foothills and piedmont and 2 inches across the mountains. Advisories can also be issued
for “impact events” where a dusting of snow on very cold road surfaces can lead to
b. Light sleet accumulations of less than ½ inch.
c. Widespread or localized blowing snow reducing visibilities to ¼
mile or less with winds less than 35 mph.
d. Light snow and blowing snow where sustained winds, or frequent gusts,
of 25 to 34 mph are accompanied by falling and blowing snow, occasionally reducing visibility to
¼ mile or less for three hours or more.
e. Winter weather events with multiple precipitation types in which at
least one precipitation element meets or exceeds Advisory criteria. Or, a winter weather event
Advisory-level event plus Advisory criteria wind speeds.
Wind Chill Advisory - Wind chill temperatures reaching or exceeding minus 5 in the
mountains, or zero outside of the mountains.
WFO GSP will use CAENPWGSP to issue the following type of Advisory
Freezing Fog Advisory - Issued for fog that freezes upon contact with exposed
objects to form a coating of rime and/or glaze.
Advisories should be updated at least once every 6 to 8 hours until the event ends, or is
Nowcasts and Special Weather Statements
The Short-Term Forecast
(CAENOWGSP) is the primary vehicle for conveying the
evolution of imminent or occurring winter weather over the next six hours. NOW's are
event-driven and should be updated every 1 to 3 hours when weather conditions dictate.
When short-fuse weather conditions require wider dissemination and more immediate
attention, a Special Weather Statement (CAESPSGSP) can be issued. For example, this might be
useful when mesoscale bands with intense snowfall rates are expected to set up over a certain
Public Information Statements
The Public Information Statement (CAEPNSGSP) is the primary public product used to
summarize the latest winter precipitation, high wind, or wind chill observations for the public and