Will Nolo become a Category 5 hurricane? — Category 5 or above

- [2026-09-24] Nolo became a hurricane south of Hawaii; NHC's 11 AM HST advisory on Sept 24 listed sustained winds "near 70 mph" and said "Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Nolo is forecast to become a hurricane by tonight and a major hurricane by this weekend." Source: nhc.noaa.gov (public advisory). - [2026-09-25] Nolo reached Category 2 strength approaching the Big Island, with "Nolo's maximum sustained winds were at 105 mph, making it a Category 2 storm" as it threatened Hawaii with catastrophic flooding rain. Source: npr.org. - [2026-09-26] Nolo held Category 2 intensity while meandering south of the Big Island; at 11 p.m. HST it "strengthened to a Category 2 storm Saturday night as it continued moving west, with forecasters expecting it to become a major hurricane Sunday... At 11 p.m., Nolo had maximum sustained winds of 100 mph." Source: staradvertiser.com. - [2026-09-27, 05:00 HST] NHC's official forecast discussion (Advisory 28) set the initial intensity at 90 kt (105 mph) and explicitly forecast Nolo to "become a major hurricane in the next 12 h and peak as a category 4 hurricane" , with the 24h forecast point calling for 115 kt (130 mph) by 1200Z Sept 28. Source: nhc.noaa.gov (forecast discussion #28). - [2026-09-27, 11:00 HST] Nolo was upgraded to Category 4 with "maximum sustained winds of 130 mph and moving west at 12 mph" , becoming the fourth system to affect Hawaii this season; forecasters said it was "predicted to become a major Category 3 hurricane later tonight and peak as a Category 4 cyclone with 130 mph winds Monday." Source: staradvertiser.com. - [2026-09-28, 00:00 UTC] Independent tracker data show Nolo's "records 213 km/h winds, 245 km/h gusts and a pressure of 948 mb... strengthening from the previous reading: wind rose from 185 km/h to 213 km/h while pressure fell from 966 mb to 948 mb" — i.e., ~132 mph sustained, still Category 4, and still intensifying. Source: rainviewer.com. - [2026-09-28] Weather.com's live tracker updated its headline to flag upside risk, reporting Nolo "could get stronger, peaking in intensity as a Category 5 hurricane on Monday" (Sept 28), a revision upward from the prior day's Category 4 peak forecast, while noting "Beyond Monday, Nolo should begin to weaken. It will begin to turn toward the northwest and eventually due north before taking another sharp turn to the west on Wednesday." Source: weather.com. - [2026-09-28, 11:04 PM EDT] Weather.com's most recent update confirms Nolo is currently a Category 4 hurricane that has "rapidly intensified into a Category 4 hurricane as it moves westward into more favorable conditions," with "winds have increased 55 mph in just 24 hours," and a hurricane watch now posted for the Papahanaumokuakea Marine National Monument. Source: weather.com. - [2026-09-28] NPR's latest sitrep put Nolo's winds at "maximum sustained winds of 130 mph, making it a Category 4 hurricane" , still south of the main islands and forecast to reach peak intensity Monday (Sept 28) before weakening. Source: npr.org. - [2026-09-28, 04:45 UTC] NHC's homepage confirms it is still actively issuing advisories on Hurricane Nolo in the Central Pacific, alongside separate advisories for Hurricane Polo and TS Rachel in the Eastern Pacific. Source: nhc.noaa.gov. - [2026-09-27] Context: this is Hawaii's fourth tropical system of the season, following Category-5-peaking Hurricane Lowell in a season made unusually active by "Hurricane Lowell, a powerful hurricane that reached Category 5 strength at its peak" earlier in the season — showing Category 5 intensities are climatologically achievable in this basin/season. Source: weather.com. - [2026-09-28] No coastal watches/warnings remain for the main Hawaiian Islands as Nolo pulls away; the storm is forecast to turn northwest then north over the next several days before shear increases and induces weakening by Tuesday/Wednesday (Sept 29-30), per the NHC discussion's 96-120h forecast points showing decay to 65-70 kt. Source: nhc.noaa.gov (forecast discussion #28). BOTTOM LINE: As of Sept 28, 2026, Nolo is a strengthening Category 4 hurricane (~130-132 mph sustained per NHC/trackers) still gaining strength over warm, low-shear water, with at least one major outlet (weather.com) now forecasting a Category 5 peak (≥157 mph) later Monday before increasing shear forces weakening by Tuesday/Wednesday — meaning the official NHC intensity forecast is currently right at the Cat 4/Cat 5 boundary and the outcome hinges on the next 24-48 hours of observed intensity. NOT FOUND: No NHC advisory explicitly stating a peak wind forecast of ≥157 mph (Category 5) has been located directly on nhc.noaa.gov; the Category 5 peak reference so far comes only from weather.com's Sept 28 update, not yet corroborated by a fetched primary NHC advisory text with that number. No confirmation yet of an actual observed Category 5 intensity (157+ mph) having occurred.

- [2026-09-28] Nolo has already reached Category 4 intensity; a NHC advisory (5 p.m. HST Sun) reported Nolo's maximum sustained winds have increased to 155 miles per hour , and NHC's forecast text explicitly states "NOLO STRENGTHENS INTO A CATEGORY 4 HURRICANE." Category 5 threshold is 157 mph, only 2 mph above the latest reported intensity. - [2026-09-28] Weather.com's live coverage states Nolo could get stronger, peaking in intensity as a Category 5 hurricane on Monday, after which it should begin to weaken , indicating official/media consensus forecasts put peak intensity at or just above the Cat-5 threshold within ~24 hours of the report date. - [2026-09-27] An NHC forecast discussion issued 27/2100Z (Sun 11 a.m. HST) projected intensity of 125 KT / 145 MPH at 24h and 115 KT/130 MPH at 36h , only marginally below the 136-knot/157-mph Cat-5 cutoff, with the agency's own forecaster noting the NHC intensity forecast is still on the high end of the guidance envelope — meaning official guidance was already flirting with, but not confirming, Cat-5. - [2026-09-28] RainViewer's tracker recorded Nolo's latest reading at 00:00 UTC on September 28 as 213 km/h winds (≈132 mph), matching the recorded peak intensity so far — slightly below the 155 mph figure reported by NHC hours later, consistent with rapid, ongoing intensification. - [2026-09-28] Reference-class context: the 2026 Pacific hurricane season has already produced three Category 5 hurricanes — Genevieve (July), Lowell (September), and Polo (September) — tying it with the 1994, 2002, and 2018 seasons as the season with the most Category 5 hurricanes . This is a far higher Cat-5 base rate than a typical season (average Pacific season has 4.2 major hurricanes and rarely more than one Cat-5). - [2026-09-27] Hurricane Polo, this season's most recent Cat-5, explosively intensified into a Category 5 hurricane by September 22, and with a central pressure of 892 mbar was the second-most intense Pacific hurricane by central pressure ever recorded , illustrating that this season's environment (warm SST/El Niño) has repeatedly supported extreme rapid intensification events that reached or exceeded the Cat-5 bar. - [2026-09-24] NOAA/NHC forecasters have shown a pattern this season of storms reaching Cat-5 and then weakening quickly; for Polo, coverage noted the storm regained its Category 5 status on Wednesday evening with estimated maximum sustained winds of 260 km/h , showing fluctuation around the threshold is common in this basin's current highly favorable environment. - [2026-09-26] Multiple outlets (Star-Advertiser, NBC, CBS, Weather.com) consistently reported NHC's official language that Nolo is predicted to strengthen into a major hurricane on Sunday and peak in intensity by early Monday, thereafter steady weakening is expected — the "peak intensity" window is very near the market's live evaluation window, meaning the outcome should be resolved (or clearly missed) within days, not weeks. - [2026-09-28] Weather.com also noted that an earlier storm this season, Hurricane Lowell, reached Category 5 strength at its peak, then weakened before making its closest pass to Hawaii — a directly comparable precedent of a Hawaii-approaching storm attaining Cat-5 status just before/while affecting the islands. - [2026-09-22] For contrast on how fast Pacific storms can reach Cat-5 this season, Polo intensified from a 50 mph tropical storm to a wind increase of 110 mph, going from a 50 mph tropical storm to a 160 mph Category 5 from Monday to Tuesday morning , demonstrating that under this season's conditions, jumps of 20-30 mph within 24 hours (enough to push Nolo from 155 mph past 157 mph) are not just possible but have already happened multiple times. BOTTOM LINE: The reference class here is unusually favorable for a "Yes": this is already a record-tying season for Category 5 Pacific hurricanes (3 so far), Nolo is already at 155 mph (2 mph below threshold) with NHC's own short-term forecast calling for further strengthening to peak intensity within about 24 hours, and comparable storms this season (Polo, Lowell, Genevieve) have repeatedly punched through the Cat-5 bar via rapid intensification in similarly favorable warm-water/low-shear conditions. NOT FOUND: No confirmed post-peak NHC advisory (after the 5 p.m. Sunday 155-mph reading) showing whether Nolo actually crossed 157 mph; no explicit statement that Nolo has been officially upgraded to Category 5 as of the time of research.

YES means: Nolo's maximum sustained winds reach or exceed 157 mph (i.e., NHC officially classifies it as a Category 5 hurricane) at any point before the market closes (Dec 2, 2026 / effectively before weakening begins). - [2026-09-27, 11:00 PM HST] NHC Forecast Discussion Number 31 (issued 0900Z Sep 28) set Nolo's initial intensity at 135 KT 155 MPH at INIT 28/0900Z, with a 12H forecast of 145 KT 165 MPH at 28/1800Z — meaning NHC's own official forecast, not a media outlet, projects Nolo crossing the 157 mph Cat-5 threshold within roughly 9 hours of that advisory. - [2026-09-27, 11:00 PM HST] The same discussion explicitly states Nolo is in a highly favorable environment: The hurricane has been situated in an environment that is quite conducive for strengthening, with low vertical wind shear and sufficiently warm sea surface temperatures , and that this regime should persist for at least the next 12 hours or so — i.e., the window for further intensification into Cat-5 range is confirmed to remain open through roughly the same period the forecast calls for peak winds. - [2026-09-27, 11:00 PM HST] NHC forecaster Pasch noted the official intensity forecast remains at the high end of the model guidance , indicating the agency itself sees upside risk beyond even its already-Cat-5-level number, consistent with rapid intensification continuing to outpace forecasts as it has all weekend. - [2026-09-27, 8:00 PM HST] NOAA/NESDIS satellite-based intensity estimate (GOES floater bulletin) already had Nolo at NOLO NOW HAS 150 MPH WINDS... As of 8:00 PM HST Sun Sep 27 the center of Nolo was located near 16.4, -160.8 with movement WNW at 12 mph. The minimum central pressure was 934 mb with maximum sustained winds of about 150 mph , showing intensity climbing roughly 20 mph in 6 hours (130→150 mph) — a pace that, if sustained even briefly, closes the remaining 7-mph gap to Category 5 easily. - [2026-09-27, 5:00 PM HST] NHC's own Advisory 30 already had Nolo at MAXIMUM SUSTAINED WINDS...145 MPH...230 KM/H with a central pressure of 939 mb, only 12 mph short of the Cat-5 bar and falling pressure indicating continued deepening. - [2026-09-28] Weather.com's live tracker, reflecting this same trend, forecasts Nolo could get stronger, peaking in intensity as a Category 5 hurricane on Monday , aligning media guidance with NHC's own 155–165 mph forecast window. - [2026-09-28] The storm retains a well-organized, annular structure per NHC: Nolo's annular structure could result in a slower rate of weakening than seen in typical hurricanes , meaning even after peak, any brief excursion above 157 mph would need only be captured once by a Hurricane Hunter/Dvorak fix for an NHC advisory to certify Cat-5, and the annular structure suggests intensity may hold near peak (rather than dropping off sharply) for longer than a typical storm, widening the window an aircraft or satellite estimate could sample ≥157 mph. - [2026-09-28, 05:38 EDT] Real-time NOAA/NESDIS GOES imagery confirms Nolo remains an actively monitored, intensifying system positioned near 16.5°N/161.3°W, consistent with the NHC discussion's 0900Z initialization point, corroborating that the storm was tracking exactly along the path where the 155→165 mph forecast applies. - [2026-09-27] Context from the same season reinforces plausibility of the mechanism: this basin has already produced three Category 5 hurricanes this year, and Hurricane Polo most recently Then there was Hurricane Lowell, a powerful hurricane tha [t reached Category 5 strength], demonstrating the mechanism (rapid intensification to Cat-5 under low shear/warm SST) is not just forecast but has repeatedly verified in this exact basin and season. BOTTOM LINE: The single most likely path to YES is already underway and officially forecast by NHC itself: Nolo's own Discussion #31 (issued 11 PM HST Sep 27) sets its initialized intensity at 155 mph and forecasts 165 mph within 12 hours, both above the 157 mph Cat-5 threshold, in an environment NHC explicitly calls "quite conducive for strengthening" for at least the next 12 hours — meaning an NHC upgrade to Category 5 in the Sept 28 morning/midday advisories is the base-case scenario per the agency's own numbers, not a tail risk. NOT FOUND: No advisory yet fetched dated after 11 PM HST Sep 27 (0900Z Sep 28) confirming an actual observed/certified reading ≥157 mph or an explicit "NOLO BECOMES A CATEGORY 5 HURRICANE" headline; the most recent primary-source advisory located (Discussion #31) is a forecast, not yet a confirmed observation, of the Cat-5 crossing.

YES means: Nolo's maximum sustained winds reach ≥157 mph (Category 5) at any point before the market closes on 2026-12-02, per NHC's official advisories. - [2026-09-27, 11:00 AM HST] NHC's own quantitative forecast (Discussion #29) never projects Nolo crossing the Cat-5 threshold: the official track calls for FORECAST POSITIONS AND MAX WINDS INIT 27/2100Z 16.2N 159.3W 100 KT 115 MPH 12H 28/0600Z 16.5N 160.7W 120 KT 140 MPH 24H 28/1800Z 17.6N 162.2W 125 KT 145 MPH 36H 29/0600Z 19.3N 163.3W 115 KT 130 MPH — peaking at 145 mph (still Category 4) before declining. Source: nhc.noaa.gov. - [2026-09-27, 11:00 AM HST] The same discussion explicitly frames the strengthening as capped, noting model guidance shows the typically skillful HCCA model, as well as HAFS-A, shows Nolo reaching high-end category 4 strength in 3-4 days — "high-end Category 4," not Category 5, from NHC's most trusted guidance. Source: nhc.noaa.gov. - [2026-09-27, 8:00 PM HST] The latest confirmed observed intensity in an official NHC advisory is Maximum sustained winds have increased to near 150 mph (240 km/h) with higher gusts. Nolo is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale — still 7 mph short of the 157 mph Cat-5 bar. Source: capeweather.com (NHC Intermediate Advisory 30A). - [2026-09-27→28] The rate of intensification is decelerating, not accelerating: satellite-derived estimates show winds rising 130→145→150 mph across three consecutive 3-hour snapshots ( The minimum central pressure was 934 mb with maximum sustained winds of about 150 mph...The minimum central pressure was 939 mb with maximum sustained winds of about 145 mph...The minimum central pressure was 948 mb with maximum sustained winds of about 130 mph ), i.e. gains of +15 mph then +5 mph — a slowing curve that would need to re-accelerate sharply to clear 157 mph. Source: goes.noaa.gov. - [2026-09-27] NHC's forecast discussion explicitly builds in an early expiration of the intensification window: After 36 hours, Nolo should weaken due to increasing southwesterly shear caused by the aforementioned upper low/trough , meaning the favorable window for reaching Cat-5 is narrow (roughly the next 12-24 hours from the 09-27 11 AM advisory) before shear cuts off further strengthening. Source: zoom.earth. - [2026-09-27] Independent numerical guidance is described as not fully on board with major intensification: It should be noted that while the SHIPS models are not as bearish on intensification as they were last night, they keep the system well below major hurricane strength (an earlier-cycle statement retained in the same discussion), underscoring persistent model disagreement about whether Nolo clears even Category 3, let alone Category 5. Source: zoom.earth. - [2026-09-26] A day earlier, the Star-Advertiser's report of CPHC's forecast had Nolo peaking well below Cat-5: It is expected to grow into a major hurricane over the weekend, peaking with 130 mph maximum sustained winds as it passes hundreds of miles south-southwest of Kauai late Sunday night. Steady weakening is expected after it peaks — showing the official peak-intensity number has been revised upward step-by-step (130→145→150 mph) but has consistently stayed under the 157 mph line at each successive advisory cycle. Source: staradvertiser.com. - [2026-09-27] NHC's discussion explicitly attributes the storm's stronger-than-earlier-expected trajectory to a temporary window of low shear and warm water, and pre-commits to weakening soon after peak: Nolo should further intensify today, though rapid intensification is not expected due to its large radius-of-maximum wind, moderate shear and some dry mid-level air...Additionally, Nolo could be moving over a patch of high ocean heat content, and model guidance is in better agreement on this system becoming rather strong by early next week...Weakening is expected by days 4 and 5 due to forecast strong southwesterly shear east of the trough , meaning the storm's own structural constraints (large wind radius, dry air intrusion) were cited by forecasters as limiting factors against rapid intensification even before shear arrives. Source: nhc.noaa.gov (Discussion #19, retained context). - [2026-09-28] Even the outlet flagging Cat-5 upside (weather.com) frames it as a single-day, marginal possibility immediately followed by decline, not a sustained or high-confidence outcome: Nolo could get stronger, peaking in intensity on Monday. Beyond Monday, Nolo should begin to weaken , consistent with a narrow, one-shot opportunity rather than a robust multi-day Cat-5 trajectory. Source: weather.com. - [Historical base-rate check] Wikipedia's storm-history page for Nolo confirms the storm's origin was inauspicious for extreme intensification: it Initially designated as Fifteen-E, it soon degenerated to a remnant low due to wind shear...early on September 16, the tropical depression later succumbed to the wind shear and weakened to a remnant low before regenerating — a storm that stalled and nearly died twice already, unlike this season's "clean" rapid-intensifiers (Polo, Lowell) that reached Cat-5 from more continuously favorable environments. BOTTOM LINE: NHC's own numerical forecast track has, at every advisory cycle through the evening of Sep 27, topped out at 145-150 mph — short of the 157 mph Cat-5 threshold — with forecasters explicitly building in a shear-driven weakening onset within ~36-48 hours; the intensification rate is already decelerating (+15 mph then +5 mph per 3-hour period), leaving only a narrow, unconfirmed window in which Nolo would need to defy its own guidance and jump ≥7 mph past its most recent observed intensity before shear arrives. NOT FOUND: No NHC advisory issued after the 8:00 PM HST Sep 27 (150 mph) reading has yet been surfaced; could not confirm the outcome of the actual "peak Monday" observation or any official post-peak advisory number, nor any explicit NHC forecast point at or above 136 kt/157 mph in the latest discussion.