General Product Information
Certified Snowfall Totals® is an all-inclusive service - perfect for both per-inch and seasonal contracts. For each location that you sign up for, you get access to a comprehensive database of accurate post-storm reports that includes:
• Detailed narrative of the storm
• Snow/sleet accumulation to the nearest tenth-of-an-inch
• Freezing rain accumulation to the nearest hundredth-of-an-inch
• Monthly and seasonal totals
• Seasonal accumulation threshold tracking
All reports are archived throughout the season for easy retrieval using your account login at any time!
Product Info FAQs
How do I access my snow and freezing rain totals?
Once your account is active, you can log in to our easy-to-use web interface where you can filter and search through your locations and their associated storm data.
All the information on the web site can easily be printed or exported to a PDF or Excel file.
In addition to our online platform, WeatherWorks offers a fast and easy-to-use API to access your snowfall totals.
Click here to see the full API documentation.
For more information and to find out the added benefit of using a Certified Snowfall Totals API, contact us today!
How quickly after a winter event can I access my Certified Snowfall Totals® report?
CST reports are created on a state basis or in some cases, a regional basis and are generally published within the 48 hours after the conclusion of each winter storm event.
Therefore, the report may not by completed until up to 48 hours after the event has ended in the entire state or region.
Additional time may be required for long-duration or back-to-back storms.
You will be notified at the e-mail address on your account when a storm report has been generated for your location(s).
How can I be sure that a report will be generated for my location(s)?
Any naturally precipitating and accumulating snow, sleet, or freezing rain will lead to the generation of a Certified Snowfall Totals® report.
We do not issue a CST in the following circumstances:
• Wintry precipitation fell but never accumulated on any surface
• Snow already on the ground blew/drifted back onto previously cleared surfaces
• There was a threat of wintry precipitation in the forecast but it never materialized
Although we do not issue CSTs in the above cases, we may be able to prepare a custom report for an additional charge. The average cost for a custom report ranges from $75-150.
Do Certified Snowfall Totals® reports include refreeze events?
The standard CST service does not address refreeze events (i.e., the freeze-up of standing rainwater or snowmelt).
However, we offer an add-on to the CST service called VeriFreeze that does provide detailed information regarding the formation of ice.
Click to learn more about VeriFreeze
Our Process - The CST Difference
When you purchase WeatherWorks Certified Snowfall Totals® you are receiving the nation's leading source for snow & ice verification.
Our service is preferred among snow removal contractors and is #1 among property and facility managers because a meteorologist is directly involved in all phases of the creation of your post-storm reports.
From the collection of storm measurements to quality controlling and assigning totals to your locations, there is a trained analyst working for you every step of the way.
Below is a brief description of the process our meteorologists use to generate Certified Snowfall Totals™:
First, a professional meteorologist determines where and when wintry precipitation fell
by analyzing recorded observations from surface observing stations, Doppler radar imagery, and a network of over 1,000 web cams (among other tools).
Next, our meteorologist gathers snowfall totals from a variety of sources including National Weather Service cooperative observers and storm spotters,
observing networks run by colleges and universities, road and highway department personnel, private weather observers, media, on-line forums, as well as our own staff meteorologists and interns.
Once all the data is collected, our meteorologist follows a detailed process to manually analyze the snowfall totals for spatial and temporal consistency,
ensuring any errant or biased observations are removed from the dataset.
Finally, our meteorologist assigns a representative snowfall total to each ZIP code,
using the snowfall data they quality controlled along with their knowledge of the region (e.g., local topography).
Bill or validate invoices confidently with the peace-of-mind that a trained snowfall analyst prepared your post-storm reports.
Join the growing community of highly satisfied WeatherWorks Certified Snowfall Totals™ users today!
How are the snowfall measurements you collect taken?
There are a number of acceptable methods for measuring snowfall. The general practice is as follows:
Snowfall measurements should be taken on a snowboard (i.e., a small piece of plywood painted white) placed on the ground in an open area not subject to drifting. If no snowboard is available, a wooden deck is an acceptable alternative.
Measurements are taken using a standard ruler and can be performed as frequently as every 6 hours (clearing the snowboard after each measurement).
The storm-total snowfall is the sum of all measurements taken during the storm, rounded to the nearest 0.1 inch.
If snow has blown on to or off of the snowboard, several measurements should be taken from around the area where snow has not drifted, then averaged together.
If the falling snow continually melts on the snow board and never reaches a depth of 0.1 inch, a trace of snowfall should be reported.
It is important to obtain measurements as soon as possible following a storm’s conclusion due to the fact that newly snowfall can quickly become subject to compaction, settling, sublimation, or melting.
How are the freezing rain measurements you collect taken?
Freezing rain results in ice accretion which is measured on exposed, elevated surfaces such as a tree branch or clothesline.
The total ice resulting from freezing rain is calculated by averaging the ice thickness on both sides of the surface.
Ice is measured this way because accretion does not occur evenly on all surfaces (wind and gravity causes higher ice build-up on certain sides of an object).
The storm that just occurred was not continuous. Will you issue one or two reports?
We will generally issue two Certified Snowfall Totals® reports if there was at least a 6-hour break in naturally falling wintry precipitation for the majority of the state or region.
However, our meteorologists reserve the right to issue one or two reports based on the evolution of the storm.
If your contract requires a more detailed breakdown of the storm, we can prepare a custom report for an additional charge. The average cost for a custom report ranges from $75-150.
An integral part of conveying snow and ice information is identifying the precise area where the information is valid.
This is why for our CST product we created a custom location database, utilizing geographical data from the Census Bureau, USGS, and USPS.
City boundaries and populated place centers are overlaid on top of ZIP code boundaries to determine valid ZIP code-City combinations.
Why are some of your ZIP codes and cities different from the USPS?
USPS ZIP codes were designed to make mail delivery more efficient and do not always follow geopolitical boundaries; they can cross cities, counties, and in some cases, state lines.
The USPS will rarely differentiate between parts of ZIP codes that cross city limits, instead relying on one preferred city name for the entire ZIP code (leaving you with less choices than actually exist).
These preferred names are usually derived from nearby cities, not necessarily using city boundaries to determine the most appropriate name for the ZIP code (possibly resulting in a preferred city name with which the ZIP code has no overlap).
Our location database takes into account the potential overlap between city and ZIP code boundaries, giving you the most accurate and representative location choices possible.
What is a premium location?
We designate a location as premium if it experiences a relatively high number (approximately 50 or more) of winter storm events per season.
The substantial number of winter events can be due to frequent lake-effect snowfall as well as high latitude or elevation, among other factors.
Premium locations carry a $90 surcharge on top of the standard rate resulting in a total cost of $139 each.
Can I make changes to my locations after I sign up?
Absolutely! Additional locations can always be added to your account.
Keep in mind that if you add a location that was previously inactive, there will be limited or no storm history and you may not be able to retrieve any data for that site until the next winter event occurs.
You can remove locations from your account at no charge during the year.
You can exchange locations of the same type (standard or premium) at no charge through November 30th. Afterwards, you can add locations to your account at our standard and premium rates ($49 and $139, respectively).
Note that you are only allowed one "swap" per location on your account.
VeriFreeze provides daily information regarding the occurrence of ice formation due to a recent refreeze event, as well as related phenomena like black ice.
This product is designed to give confidence to justify billing for de-icing activity.
Product Info FAQs
How was the VeriFreeze pavement temperature model developed?
The VeriFreeze pavement temperature model uses statistical methods and machine learning algorithms to estimate the pavement temperature associated with relevant meteorological data present for a given ZIP Code.
The model was constructed using three years of hourly pavement temperature data from more than 2000 stations in diverse environments across the United States, comprising nearly 30 million observations total.
These data were carefully quality-controlled and matched with relevant meteorological data that represented the weather conditions that were occurring at each station.
How accurate is the model?
The model is intended to provide verification and support for actions taken to prevent runoff and snowmelt water from becoming a liability and slipping hazard.
It provides accurate trends in pavement and air temperatures that may have initiated a service call to proactively prevent icing or treat existing icing.
Note that the pavement temperature can vary considerably based on the material the pavement is composed of, shading, and traffic, so the pavement temperatures predicted are meant to be an average of conditions seen throughout a given ZIP Code.
It is important to use the trendline as your verification. Your vehicle thermometer alerts you at 35 degrees that icing may be present.
VeriFreeze will provide you with an accurate trendline to help support the decisions you made to prevent icing.
Does the model provide forecasts of pavement temperature or other data important to refreeze?
At this time, VeriFreeze only provides analysis of events that have already occurred.
It does NOT forecast pavement temperatures out in the future.
If you are interested in beta testing a predictive refreeze product, please contact us at firstname.lastname@example.org.
What is the probability <32?
The probability <32 feature in the daily summary is a product designed to assign a measure of confidence in the pavement temperature falling below freezing.
Higher probabilities are typically correlated to pavement temperatures that fall to or just below freezing, but some variability in the probability value may be encountered based on environmental and meteorological conditions.
Does the precipitation amount refer to how much snow, sleet, or freezing rain I received?
The precipitation amount refers to the amount of liquid precipitation if it was rain or the liquid equivalent if it was a wintry precipitation type.
This provides support for actions that may have been taken due to wet pavement as temperatures were cooling toward the freezing point.
I see that the reports are for 10AM – 10AM. What day should I pick if I’m interested in what happened between 2AM and 6AM?
If you are interested in the overnight hours, simply pick the date that matches the first day in the 24-hour period of interest.
For example, if you wanted to see data from 2AM – 6AM of February 20 – 21, you would pick the February 20th date.
Can I customize a time range to extract data from?
To ensure consistent representation across the board, data is provided in a standard daily report that encompasses a 10AM - 10AM window.
Special requests for different time ranges can be directed to email@example.com.
Understanding the Science of Refreeze and Pavement Temperatures