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GaWx

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  1. GaWx
    Well, well, well…if it isn’t the GFS up to its old tricks again. The 18Z GFS literally gives Tahiti on 5/13 a record low May SLP due to a nearby tiny surface low that gets as low as 1002 mb, highly unusual for May as it’s ~12 mb/0.36” BN. This results in ~1004.5 mb Tahiti pressure on 5/13. How low is this vs May history back to 1992? Well, the record low is 1004.7 (5/10/2002, during another incoming Nino). Second lowest? 1006.1 (5/31/1997, another incoming El Niño). Other very low SLPs there in May were also during incoming El Niño periods: 1007.5 on 5/9/2015 and 1007.8 on 5/19/2009. Will the record low May Tahiti SLP verify? Very highly doubtful considering that only the 18Z GFS had it that low with a tiny low almost right on top of Tahiti whereas other models had no low: 18Z GFS: 1002 low very near Tahiti But other recent GFS runs have also had a tiny low nearby though not as close. The brand new 0Z has the low but it’s not as close nor as strong (1005 instead of 1002). So, its lowest 24 hour averaged Tahiti pressure is only down to 1009 mb (on 5/12). I thought it was a good idea to post this because this could cause a couple of very strong -SOIs 5/12-13. Even just down to 1009 at Tahiti like the 0Z GFS has would mean a -35ish 5/12 SOI with near avg Darwin SLPs. This reminds me to mention that while Tahiti SLPs have been BN to MBN for most of the last 30 days (common with incoming Nino), there still have been no high pressures at Darwin, which have largely been NN. This is near the opposite of how April of 1997 went. It had 17 days of Darwin SLP of 1012+ vs only one day of that in April of 2026! There are few, if any, 1012+ in sight as of now other than possibly today, which may end up just above 1012 at Darwin.
  2. GaWx
    Lots of power outages in Boulder and Denver areas from the very heavy wet snow. Is this going to end up a May record breaker for Boulder? This is from Boulder:
  3. GaWx
    I had another enjoyable evening walk due to still pretty comfy dewpoints for early May. Third nice day in a row!
  4. GaWx
    They’re not mentioning that the Euro has had a warm bias though it’s lowest for an actual Nino (few ticks on average with a couple almost perfect). May run has almost never verified too cool. They’re probably not aware of this bias. You won’t be less you study the verifications going back aways like I did. Of course even a warm bias doesn’t mean it will definitely verify colder.
  5. GaWx
    1982-3 was east based and was an amazing winter snow wise in much of the SE US (E AL to NE NC)!
  6. GaWx
    Also, note that like the CFS that the Euro has the Nino being pretty east based. Taking a few tenths off of this Euro prog due to its warm bias and then cooling it ~0.5 to roughly estimate RONI likely yields something pretty similar to the +2.5 C peak RONI (+2.7C peak month) of the most recent CFS runs, which would be near a record warm RONI (back to 1950) and would be a 1982-3 redux.
  7. GaWx
    Also, note that climo used for TT’s CFS is 1984-2009, which is cooler than 1991-2020. If these CFS happen to verify, they’d make much more sense vs history of strong El Niño with their coolest anomalies in the S US vs the coolest anomalies on Cansips being in the N US, which is extremely out of sync with strong Nino climo. Also, the CFS has had and continues to have a stronger and more E based Nino vs a not quite as strong C to W based Nino on the Cansips runs: CFS: pretty E based and very strong Cansips: much more C to W based and not quite as strong
  8. GaWx
    The slight lowering from March does though jibe with the slight downward trend of these WCS dailies:
  9. GaWx
    The April and FMA relative and non-relative have just been released and they suggest the most recently calculated differential is ~0.6C: 1. FMA: ONI +0.11 RONI -0.48 0.59 diff vs 0.56 diff. JFM 2. April alone: ONI +0.36 RONI -0.24 0.60 diff. vs 0.55 in March
  10. GaWx
    My leaning of the weekly relative 3.4 going up from +0.2 in last week’s release to +0.4 in today’s turned out to be what happened for its 4th rise in a row. Nino 1+2 cooled again (by 0.2) to +0.7. Nino 3, like Nino 3.4, rose for the 4th week in a row to +0.5. Nino 4 was unchanged at +0.5. So far, it’s not behaving as if it is headed to strongly E based this autumn. Cansips has been suggesting central to W based with E (1+2 to 3) not as warm as C to W (3.4 to 4), but we’ll see as there’s a long way to go: Date (avg for wk centered on)………………....1+2………..3………..3.4………..4 01APR2026 0.8 -0.3 -0.3 0.2 08APR2026 1.1 -0.1 -0.2 0.3 15APR2026 1.2 0.2 0.1 0.6 22APR2026 0.9 0.3 0.2 0.5 29APR2026 0.7 0.5 0.4 0.5 ——————- The latest SSTa charts suggest a pause, which is long overdue, MAY finally be occurring temporarily:
  11. GaWx
    There was a historic very heavy snowstorm in the SE US on 3/24/1983. ATL got 7.9” of very wet snow, their heaviest snowstorm since Jan of 1940. That even gave Savannah a trace of sleet! ATL also had its snowiest winter (10.3”) since 1939-40 (another El Niño by the way).
  12. GaWx
    But this CFS run is still showing a RONI-ONI gap of 0.5C (+2.5 vs +3.0). That narrowing is <0.1 vs the JFM gap of 0.56.
  13. GaWx
    Officially I see only 0.05” at RDU for May 1-2: https://kamala.cod.edu/nc/latest.cdus42.RDU.KRAH.html Also, I see only 0.63” at FAY vs 0.91” on the map: https://kamala.cod.edu/nc/latest.cdus42.FAY.KRAH.html It’s as if they put in the wrong map. Maybe that was a forecast map?? But it has GSO right with nothing. Here’s a link to the last 7 days rainfall, which shows 0.44” at RDU, 0.77” at FAY, and 0.16” at GSO: https://kamala.cod.edu/offs/KRAH/2605031100.sxus52.html
  14. GaWx
    Thanks, snowman. Indeed, it’s forecasting a 1982-3 redux as of now. The corresponding latest CFSv2 ONI forecast is at +3.0C, which is maintaining the recent ~0.5C difference between ONI and RONI:
  15. GaWx
    There’s a May 2026 obs thread here:
  16. GaWx
    KSAV (airport) had a record breaking low of 46 this morning. It was colder than all of the model progs, which were 49 to low 50s. The 46 is the second coldest low since March 21st! Also for KSAV, that’s the 4th record low within the last 12 months: 11/11/2025, 2/1/2026, 3/18/26, and 5/3/26 6/27/2012 through 5/14/2013 appears to be the last time for that to have occurred. As the dates show, KSAV has had 4 record lows within just the last 6 months! The last time there were 4 record lows within 6 months: 6/6/2005-7/11/2006. There were a whopping 6 during 5/23/2006-7/11/2006! Considering the warming globe, that’s getting more and more difficult and is thus quite notable. To put the GW related handicap into perspective, there have been 9 record highs during this same period that there were 4 record lows. Hunter (KSVN) had a low of 47. Today and tomorrow will be very pleasant for early May with forecasted highs in the mid to upper 70s and dewpoints of mainly 45-52.
  17. GaWx
    Agreed and Jax made the correction. But it’s too bad that the monthly updates have stopped. In other ENSO news, I still find it interesting that this sharp warming is occurring without a sustained or notably strong -SOI. We’ve had only short periods of strong -SOI so far and I see no long ones over the next week or so. Some negatives sure, but..
  18. GaWx
    Ooops, Chuck, sorry, I misunderstood you in my prior post. I misinterpreted that you were saying strong STJ as opposed to strong La Niña STJ pattern meaning, the opposite, a very weak STJ.
  19. GaWx
    The reds are actually BN, not AN. I know, kind of strange coloring. The SE drought was/is bad due largely to the very dry winter.
  20. GaWx
    What about these? I’m going to delete them soon due to big size taking up too much of my attachments space: https://psl.noaa.gov/data/usclimdivs/
  21. GaWx
    Since the middle of last night, my area had ~18 hours of near continuous rain, which added to ~1.2” at my place. This was well predicted. It was a near perfect rain to help with drought since it was mainly light to moderate meaning little runoff. I’ll refine this final amount later, if needed. Yesterday’s showers added to only a few hundredths. This is the first event with 1”+ here since way back on Dec 4-5! Great start to May. That also means ~2.2” over the last 7 days in an area that had gone to extreme drought on the latest map due to extreme dryness back to Sept, near the worst drought condition in the US. This doesn’t end the drought but does put a nice dent in it even if only temporary. Hopefully others in a similar situation get similar relief soon if they haven’t already. This event should also have helped with the big fires to the SW. Due to the rain and N winds north of the front, it was quite cool for May with low 60s all day.
  22. GaWx
    Based on OISST, Monday’s weekly RONI equivalent for this week averaged out should be warmer than the +0.2 of last week. I’m leaning to +0.4 but +0.5 is possible. Today’s RONI equivalent is ~+0.5-+0.6:
  23. GaWx
    We could debate the GW component of OHC when comparing to past Nino events. But regardless, the current 5 month rate of warming of 180-100W OHC is the fastest on record (2.69) back to ‘79: https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/ocean/index/heat_content_index.txt So, the avg. steepness of the rise in this graph since Nov is a record for a 5 mo. period:
  24. GaWx
    Thanks, Chris To remind all of the obvious, 2026 has the advantage of the warmest merely due to GW, which of course should be taken into account when comparing the strength of the upcoming Nino to others. How much has it warmed since 2015? 1997? 1982? Haven’t oceans warmed at least ~0.5C since ‘82? The GW component of the tropical oceans should essentially be taken out when comparing strengths of ENSO, which is what RONI does. Even after taking this into account though, 2026 is in contention for the strongest Nino on record. This is also the case for OHC comparisons.
  25. GaWx
    2002-3 and especially 2009-10 were cold in the SE.
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