Jump to content
  • Member Statistics

    17,608
    Total Members
    7,904
    Most Online
    NH8550
    Newest Member
    NH8550
    Joined

Countdown to Winter 2023-2024


eyewall
 Share

Recommended Posts

  • 4 months later...
On 7/5/2023 at 3:44 PM, CaryWx said:

What's a good Nino signal for next year for the southeast?  I think no more than moderate.  Maybe 1.5-1.75??

Asking the experts.

 

Thanks

 RONI (Relative ONI) takes into account how warm Nino 3.4 is in relation to the worldwide tropical waters, which are currently very warm. As a result, the RONI of AMJ of 2023 was 0.4 lower than ONI and it was ~0.3 lower in recent trimonths. Wx patterns supposedly correlate better to RONI than to ONI. So, folks maybe should consider subtracting ~0.3 to 0.4 off the expected ONI peak and compare to prior RONI peaks to get a better idea of how this winter may turn out.

RONI:

https://www.cpc.ncep.noaa.gov/data/indices/RONI.ascii.txt

 There have been two winters on record with ~2.0 RONI peak that were quite cold in the SE, 1957-8 and 1965-6. Also, 1972-3 and 1982-3 both had historic winter storms and they peaked way up at 2.2 to 2.5 per RONI.

 Right now, my thinking is that a strong ONI peak is most likely with high end moderate and low end super less likely. Subtract a few tenths from that to get the most likely RONI conversion although the ONI/RONI relationship is always changing.

  • Like 4
Link to comment
Share on other sites

  • 2 weeks later...

There have been two winters on record with ~2.0 RONI peak that were quite cold in the SE, 1957-8 and 1965-6. Also, 1972-3 and 1982-3 both had historic winter storms and they peaked way up at 2.2 to 2.5 per RONI.

I was born in March of 57 so I can't say much on that other than they were good years but I do remember the 72-73 winter pretty well in the upstate of SC as I had short sleeves to start out the day,not sure it was Dec or mid Jan but just got out of class at school and was pumping gas in my car, just 16 and not long had gotten my drivers license. Long story short an Artic cold came through town with such strong winds that traffic signals fell, trees blew over, I helped chase a mans toupee across the parking lot. In the time it took me to pump gas, pay for it get back in car and get home about 40 mins temps were below freezing and snow had began to fall. We probably talking a 40 degree temp drop in a short time.     I never will forget that day.   

  • Like 2
Link to comment
Share on other sites

7 hours ago, Occluded Front said:

There have been two winters on record with ~2.0 RONI peak that were quite cold in the SE, 1957-8 and 1965-6. Also, 1972-3 and 1982-3 both had historic winter storms and they peaked way up at 2.2 to 2.5 per RONI.

I was born in March of 57 so I can't say much on that other than they were good years but I do remember the 72-73 winter pretty well in the upstate of SC as I had short sleeves to start out the day,not sure it was Dec or mid Jan but just got out of class at school and was pumping gas in my car, just 16 and not long had gotten my drivers license. Long story short an Artic cold came through town with such strong winds that traffic signals fell, trees blew over, I helped chase a mans toupee across the parking lot. In the time it took me to pump gas, pay for it get back in car and get home about 40 mins temps were below freezing and snow had began to fall. We probably talking a 40 degree temp drop in a short time.     I never will forget that day.   

Awesome story. That was a big time arctic front right there. Wish I would of been around to experience it. That's the stuff that gets me through these hot and humid summers. Love those old winter storys. Hoping to add some new ones this winter hopefully. 

  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...

 Although it jumps around a lot and isn't at all reliable, especially this far out, it is fun to note that the new CANSIPS is calling for the coldest DJFM for a good portion of the SE since 2013-4. It has the SE US with about the coldest anomaly in the entire world then. With this being El Niño, that chance is enhanced and it probably has a lot to do with why the model shows it that chilly.

  • Like 3
  • Thanks 1
Link to comment
Share on other sites

A fun scenario to think about on one of the hottest days of the year.  If would be fun if we got the central SC heavy snow (4+") unicorn event.  Still after so much disappointment I remain quite skeptical.  I am also buying a lottery ticket because you just need it to happen once to declare victory in these parts.

  • Like 2
Link to comment
Share on other sites

 Looking ahead to the possible effects on SE winters 2024-5 through 2028-9 from the January of 2022 Tonga volcano, the chance of a multiyear El Niño MAY be enhanced while the volcano still has influence, especially during 2025-9. Note how the DJF temperature anomaly pattern over the US in figure 7a comes rather close to a typical El Niño, including the cool SE and mild NW. Also, note especially figure 11d, which shows an El Ninolike Pacific SSTa pattern:

 

"The MiMA simulations confirm the robustness of the SWV-induced wave structure in the Pacific (Fig. 11ef), and they produce tropical surface temperature anomalies consistent with an El Nino-like pattern (Fig. 11a-d). This heating is produced by the zonally asymmetric distribution of SWV in the tropics, and consistent with the increased surface downward longwave flux over the tropical Pacific in WACCM (Fig. 9a). Thus, it is possible that the SWV forcing from the eruption would favor a positive phase of ENSO on a multi-year timescale, but further work is required to confirm this, in particular with a model including fully interactive ocean and cloud feedbacks."

 

https://www.researchgate.net/publication/372889143_Long-term_surface_impact_of_Hunga_Tonga-Hunga_Ha'apai-like_stratospheric_water_vapor_injection

  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...
  • 4 weeks later...
19 hours ago, kvegas-wx said:

Ok what is with all the wooly worms??  I have lived here in the Triad for 22 years and not once have I found wooly worms just crawling around my driveway.  They are everywhere!! Is this just a local infestation or is mother nature trying to tell me to buy a snowblower??  :sled:

I wonder the same thing about all these pine cones, can't see the grass for pine cones all over the place and for what its worth the lack of spider webs the last 2 months is strange and the ones that I do find are about 3 foot off the ground and not high like usually. 

Link to comment
Share on other sites

10 hours ago, Jonathan said:

Super Ultra Mega Generational Nino on the way to rain (literally) on everyone's parade for the next two years.

I didn't think this comment was serious at first, but after reading it again I see you added "ultra".  Now I'm quite concerned.  I plan on adding a canoe and waders to my disaster supplies. I will also go ahead and sell my snow plow blade on Facebook Marketplace while prices are high. Thank you for this information!  :raining:

  • Haha 2
Link to comment
Share on other sites

El Niño Oct PNA:

Strong +PNA: 53, 65, 79, 15

Mod +PNA: 63, 76, 77, 86, 87, 14

Weak +PNA: 57, 68, 69, 09

Neutral PNA: 51, 58, 94, 18

Weak -PNA: 97

Mod -PNA: 82, 02, 06

Strong -PNA: 72, 91, 04
 

SE US from coldest to warmest Nino winters

57, 63, 65, 69, 76, 77, 09: cold

68, 86, 87, 02, 14: cool 

58, 72, 79, 82, 04: NN

94, 97, 06: mild

51, 53, 91, 15, 18: warm

———————

Correlation of Oct PNA to SE US winter for Nino

-25% of the 4 strong +PNA (+1+) in Oct followed by cool to cold SE winter

- A whopping 100% of the 10 weak to moderate +PNA (+0.25 to +0.99) in Oct followed by cold to cool SE winters

- None of the 4 neutral PNA (-0.24 to +0.24) in Oct followed by cool to cold SE winter

- 14% of the 7 -PNA (<-0.24) in Oct followed by cool to cold SE winter

- So, only 13% of the 15 Octs that had either strong +PNA, neutral PNA, or -PNA followed by cool to cold SE winters

- So, sweet spot by far for best shot at cool to cold SE Nino winters is Oct PNA of +0.25 to +0.99. Needless to say after just today discovering this, I’ll be rooting very hard for a +0.25 to +0.99 PNA in Oct!

** The data I’m basing this on is from the monthly PNA table seen at the 1st link below as opposed to the dailies (2nd link). That’s important to note because the monthlies average ~twice the amplitude of the dailies’ average. 

————————

 Today’s GEFS PNA prog for Oct 1-14 based on dailies is ~+0.6. However, keep in mind that the absolute value of the corresponding monthly amplitude averages ~twice as high as what the dailies would suggest. So, in this case, the equiv for the first half of Oct could easily be ~+1.2. That bodes very well for the chances of this full Oct’s PNA coming in as a +PNA when the monthly is released. But hopefully it would come in within the +0.25 to +0.99 interval so as to hit the sweet spot for the chances of a cool to cold winter:

IMG_8156.thumb.png.ec6d7363b7397d8eacc41339c21206c1.png

 

Monthly PNA (higher amp vs avg of dailies):

https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/norm.pna.monthly.b5001.current.ascii.table

 

Daily PNA (lower amp vs monthly):

https://ftp.cpc.ncep.noaa.gov/cwlinks/norm.daily.pna.index.b500101.current.ascii

  • Like 2
  • Thanks 2
Link to comment
Share on other sites

On 9/30/2023 at 5:13 PM, GaWx said:

El Niño Oct PNA:

Strong +PNA: 53, 65, 79, 15

Mod +PNA: 63, 76, 77, 86, 87, 14

Weak +PNA: 57, 68, 69, 09

Neutral PNA: 51, 58, 94, 18

Weak -PNA: 97

Mod -PNA: 82, 02, 06

Strong -PNA: 72, 91, 04
 

SE US from coldest to warmest Nino winters

57, 63, 65, 69, 76, 77, 09: cold

68, 86, 87, 02, 14: cool 

58, 72, 79, 82, 04: NN

94, 97, 06: mild

51, 53, 91, 15, 18: warm

———————

Correlation of Oct PNA to SE US winter for Nino

-25% of the 4 strong +PNA (+1+) in Oct followed by cool to cold SE winter

- A whopping 100% of the 10 weak to moderate +PNA (+0.25 to +0.99) in Oct followed by cold to cool SE winters

- None of the 4 neutral PNA (-0.24 to +0.24) in Oct followed by cool to cold SE winter

- 14% of the 7 -PNA (<-0.24) in Oct followed by cool to cold SE winter

- So, only 13% of the 15 Octs that had either strong +PNA, neutral PNA, or -PNA followed by cool to cold SE winters

- So, sweet spot by far for best shot at cool to cold SE Nino winters is Oct PNA of +0.25 to +0.99. Needless to say after just today discovering this, I’ll be rooting very hard for a +0.25 to +0.99 PNA in Oct!

** The data I’m basing this on is from the monthly PNA table seen at the 1st link below as opposed to the dailies (2nd link). That’s important to note because the monthlies average ~twice the amplitude of the dailies’ average. 

————————

 Today’s GEFS PNA prog for Oct 1-14 based on dailies is ~+0.6. However, keep in mind that the absolute value of the corresponding monthly amplitude averages ~twice as high as what the dailies would suggest. So, in this case, the equiv for the first half of Oct could easily be ~+1.2. That bodes very well for the chances of this full Oct’s PNA coming in as a +PNA when the monthly is released. But hopefully it would come in within the +0.25 to +0.99 interval so as to hit the sweet spot for the chances of a cool to cold winter:

IMG_8156.thumb.png.ec6d7363b7397d8eacc41339c21206c1.png

 

Monthly PNA (higher amp vs avg of dailies):

https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/norm.pna.monthly.b5001.current.ascii.table

 

Daily PNA (lower amp vs monthly):

https://ftp.cpc.ncep.noaa.gov/cwlinks/norm.daily.pna.index.b500101.current.ascii

Great work per usual Larry ! 

  • Thanks 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...