Welcome to December 2nd! Christmas is our next holiday. Keep giving thanks to be living in the best time of human history.......every day of the year!
Scroll down and enjoy the latest comprehensive weather to the max...... occurring because of the natural physical laws in our atmosphere as life on this greening planet continues to enjoy the best weather/climate in at least 1,000 years(the last time that it was this warm) with the added bonus of extra beneficial CO2.
Forecasts turned colder Sunday morning and have stayed around the same since then, providing some support for natural gas.
Rains returning to Argentina late week 2 but this is US weather below(see other posts for South America weather), which will be quiet the next week.
New(updated Monday PM) 762 hour(1 month) European model maps at the bottom.
Winter Weather Forecasts
Snowfall the next 7 days below.
Here are the latest hazards across the country.
Purple/Pink/blue on land is cold/Winter weather. Brown is wind, Green is flooding. Gray is fog. Reddish is a red flag advisory.
Go to the link below, then hit the location/county on the map for details.
https://www.spc.noaa.gov/ Go to "hazards"
Current Weather Map
|NCEP Days 0-7 Forecast Loop||NCEP Short-Range Model Discussion||NCEP Day 3-7 Discussion|
Current Jet Stream
|Low Temperatures Tomorrow Morning|
Highs today and tomorrow.
Highs for days 3-7:
Minor Fluctuations around average.......then warming up...but a brand new blast of frigid air towards the end of week 1 period dropping into the Upper Midwest/N.Plains.
Temperatures vs average for days 3-7.
Extremes diminish..........closer to average. Warming from the West. Mild Plains.
Turning cold far north on day 6.
Weather features day 3-7:
Strong cold front/blast late in the period.
Liquid equivalent precip forecasts for the next 7 days are below.
Some is heavy snow in the cold sector/Northeast today.
Mostly dry this week.
Day 1 below:
Day 2 below:
Day 3 below
Days 4-5 below:
Days 6-7 below:
7 Day Total precipitation below:
Last 24 hour precip top map
Last 7 day precip below that
Current Dew Points
Latest radar loop
| (3400x1700 pixels - 2.2mb)|
Go to: Most Recent Image
Go to: Most Recent Image
You can go to this link to see precipitation totals from recent time periods:
Go to precipitation, then scroll down to pick a time frame. Hit states to get the borders to see locations better. Under products, you can hit "observed" or "Percent of normal"
These maps sometimes take a day to catch up to incorporate the latest data(the bottom map is only updated once a week).
Drought Monitor maps:
Latest: The first map below is the latest. The 2nd one is from last week.
In july/August/Sept/Oct, it's typical to see some increase in drought because of evaporation, seasonally exceeding low rainfall during those months. However, this year saw a HUGE increase in the Southeast!
November 28: DROUGHT the last 2 months has really shrunk. One area to watch is sw Kansas for the Winter wheat crop.
The maps below are updated on Thursdays.
The top map is the Canadian ensemble average, the maps below are the individual members that make up the average at the end of week 2.
Each member is like the parent, Canadian model operational model.......with a slight tweek/variation in parameters. Since we know the equations to represent the physics of the atmosphere in the models are not perfect, its useful to vary some of the equations that are uncertain(can make a difference) to see if it effects the outcome and how.
The average of all these variations(ensembles) often yields a better tool for forecasting. It's always more consistent. The individual operational model, like each individual ensemble member can vary greatly from run to run.........and represent an extreme end of the spectrum at times. The ensemble average of all the members, because it averages the extremes.............from opposite ends of the spectrum.........changes much less from run to run.
End of week 2....................0z Canadian ensembles:
Updated 12z maps available this late...........turning colder late week 2 vs previous solutions. Potential for another polar vortex incursion south...on some solutions, mainly this particular model!
Sunday: Way, way more zonal and mild the past 2 days!!!!
Monday: Other models are more zonal and milder today......but the Canadian model is back to amplifying the pattern at the end of 2 weeks, so this model is colder.
Tuesday: Back to more zonal/mild, west to east steering currents today.
Thursday: Some members getting much colder late week 2
Friday: Zonal, mild west to east flow. Pretty strong agreement.
Saturday: No change from yesterday.
Sunday: Major cold still cut off.
Monday: Noteworthy changes in the last 24 hours, all of them colder but not yet extremely cold. More troughing in the middle of the country on the mean below and possible cross polar flow......or at least high Arctic north to south flow on this side of the N.Hemisphere dumping extreme cold into Canada to replace previously mild conditions there. This means cold fronts can be REALLY cold now in week 2 vs a moderate brand of mild (for Winter) Canadian cold.
360h GZ 500 forecast valid on Dec 17, 2019 00 UTC
Forecasts for the control (GEM 0) and the 20 ensemble members (global model not available)
0Z GFS(American model) Ensembles at 2 weeks:
GFS Ensemble mean(average of all the individual solutions above). The first map is a mid/upper level map. The 2nd one is a temperatures map at around 1 mile above the surface. These are anomalies(difference compared to average).
NCEP Ensemble t = 360 hour forecast
Starting with last week:
Monday: The GFS ensemble is much milder and more zonal today. Just weak anomalies.
Tuesday: Slight positive anomaly West and slight negative anomaly Northeast.
Friday: Mild flow. No cold air connection. Especially mild West to middle of the country.
Saturday: Still mild, especially in Canada so cold fronts will not be that cold.
Sunday: Similar to the last week..........mild.
Latest, updated graph/forecast for AO and NAO here, including an explanation of how to interpret them...............mainly where they stand at the end of 2 weeks.
Previous analysis, with the latest day at the bottom for late week 2 period.
Discussions, starting with a week ago.
Last Sunday: Huge AO changes. Many members go very strongly positive which lessens cold air outbreak probabilities. However, some are still negative, so an incredible spread and uncertainty. NAO increasing from low values to a tad above 0.........also lessening cold risks at 2 weeks. PNA near 0. Cold risk after the first week in December have decreased.
Monday: Very positive AO decreases chances for cold from high latitudes moving to the middle latitudes. NAO moving to slightly positive is also a potential mild indicator. PNA close to zero but dropping a bit late.
Tuesday: AO spikes extremely positive, then comes back down towards zero in week 2. NAO slightly positive, PNA near zero.
Friday: Very Positive AO and NAO mean mild temps/no cold air delivery from the north. Dropping late week 2 but still positive. PNA decreases from positive to just below 0 late.
Saturday. Positive AO but a change from yesterday late week 2 as it plunges. Mainly from several members fairly negative. The actual pattern still favor +AO regime. NAO is also positive/mild but drop towards 0 at the end of 2 weeks. PNA slightly positive. Overall, at least well into week 2, indicators are favorable for mild temps.
Sunday: AO and NAO stay positive thru 2 weeks(some fairly positive values early in the period) this makes frigid outbreaks extremely unlikely. PNA slightly positive(warm West)
Monday: AO drops down to near zero by then end of week 2 for the first time in a long while.........portending a potential change that allows frigid air to move from high latitudes southward. Still slightly +NAO will make it tough for that cold to penetrate deeply south and east. Slight postive PNA with modest ridging out West(warm and dry).
The post below was from yesterday. The maps are now 3 days old and the forecast for that period has turned much colder. This is an example of the low skill and lack of consistency that models and meteorologists OFTEN but not always have in predicting weather, even general weather that goes beyond 2 weeks.
|Don't use that maps below for anything more than an explanation for why the ng market accelerated its push down on Friday.|
They are low skill and now are 2 days old........although we don't see anything that has changed.
|Week 3-4 Outlooks|
|Valid: 14 Dec 2019 to 27 Dec 2019|
Updated: 29 Nov 2019
|Please provide comments using the online survey.|
|Temperature Probability||Precipitation Probability|
|Click HERE for information about how to read Week 3-4 outlook maps|
Just for entertainment, let's look at the just updated European model monthly outlook, 850 mb temperatures, which is around a mile up. Starting with December 13th and going out to January 2nd...... every 24 hours.
Mild overall, especially East until just before Christmas when the biggest cold wave hits.
Then 2 more cold snaps that are not quite as intense just before New Years, then another just after that at the end of the period.
The N.Plains and Upper Midwest would have the brunt of the severe cold..........but this is not likely to verify because the forecasting skill at that time frame is very weak.