This site corrects factual errors and records them here. A correction is logged when a published claim that a reader could have relied on turns out to be wrong, not for typographical fixes or routine data updates.
How to Report an Error
Use the contact page. A pointer to the specific figure, the page it appears on, and the source you believe is correct will get it fixed faster than a general objection. Corrections are made promptly and are not silently overwritten.
What Gets Logged
- A figure, date, attribution or index label that was wrong.
- A claim that was true when published but has since been overtaken by data, where the page did not make its vintage clear.
- A statement that outran its evidence, even where no individual number was incorrect.
Routine weekly data refreshes are not corrections. Values on this site are revised by NOAA as a matter of course, which is described in the methodology.
Correction Log
The article stated a "+0.8°C relative-index threshold for El Niño" and contrasted it with a +0.5°C threshold for the traditional ONI. This was wrong. CPC's operational definition sets the El Niño threshold at RONI greater than or equal to +0.5°C, the same numerical threshold ONI used. The article also quoted a weekly value "for the week ending July 12"; CPC weekly values are centred on a date, not ended on one. Both have been corrected, and the weekly figure restated as +1.4°C for the week centred 15 July.
NOAA's 21 May seasonal ranges (8 to 14 named storms, 55 percent chance of a below-normal season) were attributed to Colorado State University. They are NOAA's figures; CSU publishes a separate forecast. Corrected, and the full revision sequence added. The article also stated that the season had opened with no tropical activity in the Atlantic basin. That was accurate when written in June but was overtaken by Tropical Storm Arthur in June and Tropical Storm Bertha in July, which made two landfalls. The page has been updated and now records what actually happened.
Both pages described 2015-16 as the strongest El Niño on record since 1950 without naming the index. That claim holds on ONI and does not hold on RONI, where 1982-83 ranks ahead, because 2015-16 occurred on a warmer background ocean and ONI counts that warmth as part of the event. Both pages now state the index alongside the ranking.
The page mixed two reference dates. Its title, meta description and several sentences used 11 June values (+2.1°C Niño 1+2, +0.7°C Niño 3.4) while its own data table and stat cards used 22 June values (+2.4 and +1.1). One sentence stated that Niño 3.4 and Niño 4 were "tied at +0.7°C" directly above a table showing +1.1 and +0.8. The page has been standardised on the 22 June values throughout, with the 11 June discussion values retained only where explicitly labelled as such.
Sixteen pages cited the CPC ENSO Diagnostic Discussion by date while linking to the rolling URL, which always serves the current month's discussion. Those citations would have pointed at the wrong document once the August discussion published. All have been repointed to CPC's dated archive URLs. One page citing the 11 June discussion had already been pointing at the July document.
Corrected before publication and recorded here for completeness. A draft described cocoa inventories as having risen to a near two-year high, using a figure that was current in mid-July rather than at month end; visible stocks had in fact drawn down to below 3.0 million bags by 29 July. The draft also stated there was no evidence of crop damage, which was overtaken by Ghana's COCOBOD projecting a decline of at least 16 percent for 2026/27 on 30 July.
Entries are listed most recent first. This log begins on 1 August 2026, when the policy was formalised. Corrections made before that date are reflected in the articles themselves but are not itemised here.