URGENT “Notice to Mariners” – Changes to NOAA marine products effective March 7th, 2018

By Lee Chesneau

Lee is a senior marine meteorologist, lecturer, & a graduate from the University of Wisconsin (Madison).   Lee has had a distinguished career with NOAA’s National Weather Service (NWS), NOAA Satellite Service (NESDIS), U.S. Navy Ship Routing Officer (SRO) and  a Route Analyst for Ocean Routes, Inc.

Surface analysis

NOAA OPC Surface Analyis

Changes to NOAA marine products made last November and additional changes scheduled for March 7, 2018 will  likely make route planning and heavy weather avoidance more difficult for the mariner.

Changes to the 500 Mb Chart since last November
Prior to November 13th, 2017, NOAA depicted TROF axes on its 500 Mb charts, enabling a mariner to relate the upper levels of the atmosphere to the development & movement of surface weather systems, sometimes before they are even noticeable on the charts! See actual 500 Mb & associated Surface Pressure Charts below:

Old 500Mb Chart

500 Mb forecast chart prior to Nov 2017



NOAA OPC 500 Mb chart after Nov. 2017










After November 13th, 2017, the 500 Mb charts now look like what you see depicted to the left, forcing the mariner to figure out for themselves where the TROF axes are likely to be. This change was made mostly without soliciting comments via normal maritime communications channels (e.g., “Notice to Mariners), thus denying the mariner an opportunity to have their voices heard before theses changes were implemented!

For those professional mariners who have been formally trained in NOAA products & services through continuing  maritime education & training institutions such as the Maritime Institute of Technology & Graduate Studies (MITAGS), in Linthicum Heights, MD or Simulation Training and Research(STAR Center), Dania Beach, Fl & other recognized schools, be advised of new  further changes to NOAA products scheduled to go into effect on Wednesday, March 7, 2018.

Changes in tracking surface systems
The current system for tracking all low and high-pressure systems use movement arrows showing 24-hours before & 24-hours forward from the “Valid Date and Time” for each of the 24, 48, and 96-Hour Surface Pressure Forecast charts. This gives the mariner the ability to not only track each low & high-pressure system through 5-days, but also to see the intensity trends as well.  The new tracking system for the 4 times daily Surface Pressure Analyses charts and the 24-48 & 96 Hour Forecast charts will only show the +24-hour forecast position only for those low pressure systems of gale force winds and above.

NOAA OPC Surface tracking


To the right is an explanation of how the surface  charts are depicted today plus, below is an actual example of a NOAA 96-hour forecast chart.


This real time example of a 96-hour surface forecast chart provides tracking of all low & high-pressure systems: 24-hours before and 24-hours ahead of each systems “Valid Date & Time. The incremental 24-hour positions are depicted as an “X” for low pressure and a “X” inside a circle for high pressure.  Thus, the combination of the 500 Mb charts prior to 13 November 2017 and surface pressure analyses and forecast charts up until 07 March 2018 have been described as a “Standard of Excellence”, by the Director of Training, at the Maritime Institute of Training and Graduate Studies (MITAGS).

NOAA OPC  pre-March 7, 2018 surface map track depiction

Impact of Changes to NOAA Marine Products
The 500 Mb products have been routinely utilized in weather forecasting & vessel route planning. They are now less effective with the removal of the “TROF Axes”.  Now, in addition, NOAA will be removing the tracking of all migratory surface low & high-pressure systems…except for those systems that NOAA  deems as “hazardous”. This change will include all Surface Pressure Analyses & Forecast charts, effective on Wednesday, March 7th, 2018. Hereafter, only a forecast position arrow, signifying a low-pressure system moving ahead on the charts “Valid Date & Time” (+24-hours) will be depicted on the charts, provided they are (or forecast) to produce at least gale force surface winds (34 knots and higher). This will, in my opinion, increase the risk for a mariner to miscalculate the total weather picture when creating a route plan or when considering route changes.  To quote a former Director of Training at MITAGS regarding these changes: Imagine reading a book with every third page missing and trying to piece everything together”

NOAA also wants to increase the oceanic coverage of their colored digital graphic plots of wind information as depicted below (National Digital Forecast Database (NDFD) forecasts). They want to populate more coverage of the north Atlantic and Pacific Oceans within their area of responsibility (SOLAS mandated alpha-numeric text forecasts area of coverage). Once again, this is in lieu of the changes made to the 500 Mb charts & changes to the Surface Pressure Forecasts charts.

NOAA National Digital Forecast Database (NDFD) forecasts graphic 


Reasoning and Rebuttal
NOAA’s reasoning behind these changes appears not to  be based on staffing shortfalls, nor stakeholder demands, but in their stated position to maintain their relevancy. NOAA wants to add a 72-Hour Surface Forecast product which would then be inserted between the current 48 & 96 Hours Surface Forecast charts. This may indeed sound logical, however, the downside is the significance of eliminating the tracking system currently in place for ALL MIGATORY SURFACE LOW & HIGH-PRESSURE SYSTEMS! This then would leave surface pressure analyses and forecasts charts uneven when it comes to low and high-pressure system movements (or lack thereof).

Today’s NOAA surface pressure analyses and forecasts go out to 168-hours (7-days) via the Weather Prediction Center (WPC).  Thus adding, for example, a 144-Hour Surface Pressure Forecast (6-day) might be more useful than the planned 72-Hour  Surface Pressure Forecast (3 day).  A 144-Hour forecast would also be a game changer for vessel route planning and underway route diversions!  This would be a substantial upgrade to the current NOAA product suite, as well as enhance training of mariners on using these products via institutions such as MITAGS & STAR Center.

The depicted colored digital NDFD graphics are not mandated by any IMO or STCW edict, let alone any stakeholder demand. Most importantly, they are also not universally accessible on the high seas (outside of high speed Internet range)! Once again, NOAA adding the new products jut discussed would be in lieu of the changes made to the 500 Mb charts & the imminent changes to the current Surface Pressure Analysis and Forecasts charts.

Changes like this can occur without notification, in large part, due to a lack of a process of direct communication and feedback between maritime stakeholder and with NOAA.  There may also be a lack of understanding of the needs of the maritime industry stakeholders that are engaged in 90 percent of international commerce.

Lessons learned from the El Faro sinking
Some of the recommendations made by the National Transportation Safety Board (NTSB) after the sinking of the El Faro include better optimization of NOAA services to maritime stakeholders   and a review of the effectiveness of Coast Guard exams and third party provided training. They also tasked the Coast Guard to provide guidance to approved maritime training schools offering operational level training in meteorology to ensure it includes training on the characteristics of weather systems, weather charting and reporting, importance of sending weather observations, sources of weather information, and interpreting weather forecast products.

In consideration of lessons learned from El Faro, the changes to NOAA’s analysis and forecast charts will, in effect, make training tasks much more difficult and unnecessary!

Action Needed

For those mariners who have been trained well enough to understand and rely on NOAA’s products, the time to let your viewpoints known is NOW, by contacting Benjamin Friedman, Deputy Under Secretary of Commerce for Oceans and Atmosphere ASAP!

Email:  benjamin.friedman@noaa.gov
Phone: 202-482-4569

Notifying congress (e.g., congressmen/women) & senators as well can have an important effect as well. This is all about accountability from tax foundered service provider(s), in this case NOAA, and the impact on stakeholders (mariners at all levels). This issue must be addressed and acted upon, as to enhance logical decision making in support of SOLAS & IMO objectives & beyond, to minimize weather related incidences & disasters at sea!      

Ask for a restoration of 500 Mb TROF Axes and moratorium on planned changes to NOAA marine products on March 7th, 2018 that is urgently needed to allow for constructive dialogue, feedback & consensus solutions!

Lee S. Chesneau
Lee Chesneau’s Marine Weather

email: lee@weatherbylee.com


If  you  are interested in in learning more about marine meteorology, weather forecasting, route planning and heavy weather avoidance through marine weather training  please let  us know here:






About Fred Pickhardt

I am a marine meteorologist and sailed briefly with American Export Lines in the Far East trade after graduating from State University of New York Maritime College. I have extensive experience in weather analysis, weather forecasting, optimum ship routing, vessel performance evaluations and forensic weather event reconstructions. I founded Ocean Weather Services and as Owner and Chief Consultant currently provide optimum ship routing services and forensic marine weather reports to the maritime industry.
This entry was posted in Meteorology, NOAA Marine Products, NOAA OPC, Weather Routing and tagged , , , . Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *