GaWx

These CFS ens AAM forecasts are volatile especially for later in the forecast period. So fwiw, the latest forecast mean is the most bullish yet for a rising AAM starting in ~2 weeks and actually going modestly positive (El Nino-like) in ~3 weeks:

With El Niño favored for next fall/winter, I looked at E US temps during multiyear La Niña Febs that immediately precede El Niño: 1911: cool NE/mild elsewhere 1918: cool NE/mild SE 1972: cool 1976: warm 2009: mild NE/NN SE 2018: warm 2023: warm Feb: SE temps/RDU snow1911: 1 AN/0”1918: 3 AN/T and some ZR1972: 5 BN/1.4” SN/IP1976: 5 AN/T2009: 1 AN/T2018: 7 AN/0”2023: 9 AN/0”Average of these 7 Febs at RDU: 3 AN, 0.2” SN/IPOf the 7:-one was cold-two were NN-four were mild to warm So, these analogs favor the @snowman19mild Feb thinking in the SE. So, if we get another 2/2014 like I think both@40/70 Benchmarkand Eric Webb are more or less favoring (correct me if I’m wrong), I’d be thrilled since these analogs don’t favor it. In the NE, these analogs are mixed with 3 BN and 4 AN. Here’s the avg of the 7 Febs: check out how warm the SE, Midsouth, lower MidAtlantic, and OH valley are:

Chuck, But for the second straight year it will be a borderline weak/moderate Niña based on RONI: https://www.cpc.ncep.noaa.gov/data/indices/RONI.ascii.txt

From Eric Webb, he’s clearly on the 2013-4 and seems excited:

Today I estimated that a significant portion of the E US (at least the area from Chicago to much of the SE) will end up ~5-6 warmer than normal for the first half of Jan. With that, the chance of Jan overall coming in cold is low and warmer than normal overall has a better chance. So, the cold month string will be broken most likely. Plus Dec was mainly NN from the SE to the SL area meaning Dec’s cold didn’t even come close to covering the entire E US.

Here’s a link to the last video from Michael Clark, done on 12/30 in which he was highly confident and even smug: From this 12/30 video, he posted a forecast map for 12/31-1/15 showing most of the E US (Minneapolis to SL to ATL eastward) BN. Instead it is headed toward solidly AN. I project Chicago, ATL, and RDU will end up ~+5 to +6 for 12/31-1/15. He forecasted Chic at -3 to -4 and ATL/RDU at -1 to -2. BAM is headed toward a miss of -6 to -9 for 12/31-1/15 in a good portion of the E US! @donsutherland1

I think it’s BAMwx having been colder than the models and now being forced to backtrack.

Bamwx backtracking today for the medium range:

Thanks, snowman. Yeah, Eric Webb of course knows this and thus isn’t at all saying that a full blown Nino pattern will set in by Feb. But he is as I already posted excited about E US potential in Feb as he’s been saying in recent days that a 2014 type of Feb is becoming increasingly possible. We’ll see but at least he’s laying this out and not being shy. Any guess yet as to the strength of the upcoming El Niño assuming it actually does occur?

1. The good news is that this is very old news as regards the models. 2. In addition, for the SE this for the most part will likely not be nearly as warm as the late Dec torch nor as long. 3. This refers to today through Monday. But in reality the warmth ends with a transition by Sat night.

From Eric Webb this morning: The is one of the most impressive mid-winter collapses of La Nina I’ve ever seen. If you’re still in a Nina, you are definitely not supposed to see westerly wind bursts drive this deep into the Pacific, with or without an MJO event

Per WxBell’s version of the GEFS’ mean PNA, the trend of the last few days for both the length and strength of the midmonth +PNA has been a sharp increase: watch as the midmonth green line above 0 on each of these images gets longer and peaks higher: - 0Z 1/2 run: <1 day >0 (Jan 12th); max amp +0.1 (Jan 12th) - 0Z 1/3 run: 3 days>0 (Jan 11th-13th); max amp +0.5 (Jan 12th) - 0Z 1/4 run: 4.5 days>0 (Jan 10th-14th); max amp +0.7 (Jan 11th) -0Z 1/5 run: 6 days>0 (Jan 9th-15th); max amp +1.2 (Jan 13th) -18Z 1/5 run: 8 days>0 (Jan 9th-17th); max amp +1.7 (Jan 14th) Here are those 5 images in a GIF:

1. I just present what I see, whether something I want or not on whatever I’m presenting. 2. It’s the best we have for long range guidance. Nothing in the long range does great because that’s beyond the models’ abilities. 3. EW is a tool and nothing near a crystal ball. But it often gives a halfway decent idea of what’s to come. Look at what it showed last year on this day, which all verified pretty well:

After the +PNA leaning week of 1/12-18, which gives the SE NN/coldest anomalies of E US, today’s Euro Weeklies continue with the idea of a stronger than avg gradient N to S. The -PNA returns ~1/17 and the week of 1/19-25 has the SE with NN in NC to slightly AN GA and it has moderately BN in New England. The subsequent 3 weeks all warm due to a continued -PNA and warm to NN NE and modestly AN SE though one can see the CADdies in the SE are helped on certain days thus keeping them only barely AN in the means. The Weeklies now go through Feb 15th. So far, they’re showing no sign of a cold Feb anywhere. But hopefully that will drastically change! I sure hope it’s prog of a -PNA 1/17-2/15 is going to be dead wrong!

The 12Z GEFS and EPS did go colder than 0Z/6Z late in the runs. However, it and 12Z EPS still go to a -PNA late. Hopefully those will change within the next few days. Otherwise, the best the SE can reasonably hope for imho are just short cold periods/ups and downs as any sustained cold stays to the north (strong gradient pattern N to S).