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This timeline is a chart of expected [[Everstorm]] arrival times, along with an explanation of the calculations involved.
=== Basis and Assumptions ===
[[File:OB Roshar - Everstorm Calculations.png|thumb|300px]]
===Everstorm Arrival Dates ===▼
This section details how the dates and times in the following table were determined.
We believe that the Everstorm follows a great circle path around [[Roshar]], extending outward in each direction, normal to the path, such that it covers every landmass on Roshar that we know of. {{reddit ref|Stormlight_Archive|7g4bvv|dqgggqm|text=We are the Oathbringer Beta Reader Team, AM(A)A!|date=2017-11-28}} Thus we assume a great circle path which crosses roughly through the center of mainland Roshar. This is the greatest point of potential error in the calculation as the selection is largely arbitrary. Most paths which cross through the center of the continent should provide results within a few hours of one another, however. For this analysis, a path was chosen which crosses the northern tip of Shinovar in the west and Dawn's Shadow in the East.
The Everstorm's arrival at different locations can be predicted based on the typical cycle. The tenth Everstorm arrived approximately 4 days early and regular cycle seems to have resumed with the eleventh Everstorm.▼
The Everstorm moves at a rate of 9.1 Rosharan days per cycle, which equates to an angular speed of 1.978 degrees per Rosharan hour.{{wob ref|10231|JordanCon 2018|date=2018-4-21}} The colored map of Roshar released with ''Oathbringer'' includes lines of longitude (200 divisions) and latitude (100 divisions) for the continent. {{reddit ref|Stormlight_Archive|7by9pu|dpvedpn|text=Oathbringer Megathread|date=2017-11-15}} These "Rosharan degrees" can be converted to degrees for the purpose of calculating their position relative to the path of the Everstorm. For simplicity, the map's central longitude, passing through the eastern corner of [[Kadrix]] and the eastern edge of the [[Purelake]], is taken as the Prime Meridian. Based on other maps of Roshar, the latitude passing through the southern tip of Kadrix and just above [[Rall Elorim]], is taken as the Equator. We use [[Narak]] as the point of origin along the great circle path, and determine the timing for other locations based on their angle parallel to the path from this origin. Their normal distance from the path is not relevant to the calculation, though presumably the Everstorm fades notably in strength at some distance.
{| class='infobox'▼
The provided lines of longitude are also important in determining the "time zone" of any given location. We find that mainland Roshar spans nearly 120 degrees of longitude at the most extreme points, putting the east coast about one third of a day ahead of the west coast. Because the Everstorm moves from west to east, it's slow pace is exaggerated by way it moves with the planet's rotation rather than counter to it. Unlike highstorms, which generally come and pass within a single Rosharan day, the Everstorm takes several days to cross the continent. Tracking the exact local time that it arrives is important. These calculations use a 20-Rosharan-hour clock. As the entire planet consists of 200 Rosharan degrees, every 10 Rosharan degrees corresponds to a 1-Rosharan-hour difference in local time. Rather than dividing the continent into discrete time zones, these calculations determine a unique local time (relative to the Prime Meridian) for every location.
The final step is to synchronize this model with the timing observed. The most precise data point we know of concerning this was provided by [[Kaladin]], who stated that the Everstorm passed "around noon" on the day he arrived in [[Hearthstone]]. Thus we use {{Rosharan date|1174|1|2|2}} at noon (local time) in Hearthstone as our basis for the rest of the timing. Observations of other Everstorm arrival times appear to match this observation by Kaladin within a reasonable margin of error.
▲The Everstorm's arrival at different locations can be predicted based on the typical cycle. The tenth Everstorm arrived approximately 4 days early and the regular cycle seems to have resumed with the eleventh Everstorm.
|- class=title
! Everstorm Cycle !! Shinovar !! Azimir !! Urithiru !! Vedenar !! Thaylen City !! Kholinar !! Narak !! New Natanan
|-
| {{Rosharan numeric date|1174|1|1|5}} <small>(
| {{Rosharan numeric date|1174|1|2|1}} <small>(
| {{Rosharan numeric date|1174|1|2|
| {{Rosharan numeric date|1174|1|2|
| {{Rosharan numeric date|1174|1|2|2}} <small>(2:04)</small>
| {{Rosharan numeric date|1174|1|2|2}} <small>(12:04)</small>
| {{Rosharan numeric date|1174|1|2|2}} <small>(17:16)</small>
| {{Rosharan numeric date|1174|1|2|3}} <small>(3:17)</small>
|-
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