Daily Short-Term and Intermediate Term Weather Forecast – July 3, 2022

By Sig Silber July 3, 2022weatherNo Comments

This is still an experimental article so it has some problems that need to be worked on especially the tropical section.

Here is what we are paying attention to this afternoon (Saturday) and the next two days from the Saturday afternoon NWS Forecast.:

...Tropical Storm Colin to track from the Southeast/southern Mid-Atlantic
Coast today before moving offshore on Sunday...

...Wet weather, isolated Flash Flooding and Severe thunderstorms possible
across the Southeast quarter of the nation and from the Central to
Northern Plains into the Northern Rockies, Northwest and from portions of
the Southwest into the Southern Rockies...

...Areas extending from the West Coast inland through the Great Basin and
Northern Rockies will have cooler than average temperature  while the
Plains into the Ohio and Tennessee Valleys and Great Lakes will be warmer
than average temperatures...

...Critical fire weather conditions to persist across the Great Basin this
weekend..

NOAA Updates July Outlook – June 30, 2022 – Not Much Change – Some Ocean Indicators are Surprising

By Sig Silber July 1, 2022weatherNo Comments

Updated at 2:30 am EDT July 2, 2022 to incorporate the Week 3 – 4 Outlook which suggests that the second half of July will not be as cool in the Northwest but perhaps less warm elsewhere and the Monsoon may be less robust but some other areas will be less dry.

At the end of every month, NOAA updates their Mid-Month Outlook for the following month which in this case is July. They also issue a Drought Outlook for the following month and update the three-month Drought Outlook. We are reporting on that tonight. The updated Outlook is very similar to the Mid-Month Outlook. This is surprising since the Mid-Month Outlook was issued two weeks ago and there usually are more changes in that period of time.

For temperature, the shape and location of the large dry anomaly have changed a bit. The cool anomaly in the Northwest is now slightly larger. For precipitation, the area where an above-average Monsoon is forecasted is a little larger and shifted a bit to include more of New Mexico. there is a new small dry anomaly

We provide partial-month Outlooks for the first 22 days of July which allows us to somewhat assess if the Monthly Outlook is consistent with the partial-month Outlooks and it generally is. But we will not be able to answer that question definitively until the Week 3-4 Outlook is issued tomorrow. We will provide an update at that time.

We also provide enough information for readers to understand any changes from the Mid-Month Outlook and we try to figure out why these changes were made. Many of the changes are explained in the NOAA discussion which is included in the article. The partial-month forecasts that we have provided show how NOAA thinks this will play out as the weather pattern evolves during July.

There is also a discussion of the ENSO condition which is ever so slightly different than what NOAA used to develop the Mid-Month Outlook. But there is a fairly strong signal that this La Nina will end in late winter 2022/2023. The impacts on weather may not be noticed until Spring. But that is just the current forecast and can change.

We have also begun our tropical storm coverage. Yes, it is that time of the year. We are also providing special coverage of the Monsoon by providing the links to those daily updates.

NOAA Issues their Four-Season Outlook on June 16, 2022 – One or Two Month Delay in Southern Tier Shedding La Nina Weather

By Sig Silber June 17, 2022weatherNo Comments

.Updated at 5 pm EDT on June 18 to incorporate the Week 3 – 5 Outlook issued on June 17 which is somewhat different than the full-month outlook so it is of some interest.

Change Appears to be Coming – but a bit slower than it looked last month.

Even though the IRI analysis issued last week seems to show the La Nina will end perhaps a bit sooner than previously forecast, the weather outlooks seem to show weather impacts lasting a month or two longer. Uncertainty in the ENSO forecast introduces greater than usual uncertainty in the Seasonal Outlook. But the decadal trends are strong so we see a lot of that in the longer-term outlooks.

NOAA Updates the ENSO Forecast on June 9, 2022- Maybe Yes, Maybe No on La Nina Ending in 2022

By Sig Silber June 10, 2022weatherNo Comments

Of importance, the chances of a Triple Dip La Nina are still difficult to predict but seem to be slightly lower than the estimate last month. I am not exactly sure how you define a Three-Peat. If it has to do with extending into early Winter the odds seem to be a bit lower. This is not likely to change the forecast for Winter but might change the forecast for next Spring. Finally, there is now more disagreement among meteorological agencies as to when this La Nina will end.

NOAA Updates their Week 3-4 Outlook on June 3, 2022 – Easterly Wave and Monsoon Onset Likely

By Sig Silber June 4, 2022weatherNo Comments

Updated at !:30 am EDT Monday, June 6, 2022 to include the Tropical Storm Alex Tracking Map which mostly now threatens Bermuda on Monday. A near miss rather than a direct hit is expected.

On Tuesday, we discussed the NOAA update of their Outlook for June 2022. We only had 24 days of the short-term outlooks at that time so I decided to publish the Weeks 3 – 4 Outlook when it was issued which was today. It is always issued on a Friday. This combined with the discussion issued with the Outlook provides additional insight into how June weather will evolve.

The Weeks 3 and 4 Outlook just released and the precipitation Outlook (it remains an experimental product of NOAA), seems to confirm the Outlook for the Month of June with the possible exception that parts of the Southwest may be impacted by an Easterly Wave (from tropical activity) and an early onset of the North American Monsoon (NAM).

NOAA Updates its June Outlook May 31, 2022 – Quite a Big Change in Twelve Days

By Sig Silber June 1, 2022weatherNo Comments

There has been a large change in the weather outlook for June from NOAA.

At the end of every month, NOAA updates their Early Outlook for the following month which in this case is June. They also issue a Drought Outlook for the following month and update the three-month Drought Outlook. We are reporting on that tonight. The updated Outlook is quite different from the Early Outlook which NOAA now calls the Mid-Month Outlook. For temperature, the above-normal area is smaller than the Mid-Month Outlook and a large intrusion of colder air is expected along much of the Northern Tier. The drier than normal area is significantly reduced from the Mid-Month Outlook and shifted a bit and there are two additional areas of wetter than normal in the Outlook.

We provide partial-month outlooks for the first 24 days of June which allows us to somewhat assess if the Monthly Outlook is consistent with the partial month forecasts and it generally is. But we will not be able to answer that question definitively until the Week 3-4 Outlook is issued on Friday.

There is also a discussion of the ENSO condition which is slightly different than what NOAA used to develop the Mid-Month Outlook. The Negative Arctic Oscillation (AO) expected in the first half of June is a major factor.

We have also begun our tropical storm coverage. Yes, it is that time of the year.

NOAA Issues their Four-Season Outlook on May 19, 2022

By Sig Silber May 21, 2022weatherNo Comments

Change Appears to be Coming

Today is the third Thursday of the month so right on schedule NOAA has issued what I describe as their Four-Season Outlook. The information released also includes the Early Outlook for the single month of June plus the drought outlook for the next three months. I summarize the information issued and provide links to additional maps. Additionally, I have included quite a bit in this article. I want to remind everyone that last Thursday NOAA issued their ENSO outlook and that has a lot of influence on their Seasonal Outlook. The Seasonal Outlook generally reflects La Nina conditions initially with no clear indication of when this La Nina will end. There could be a triple-dip La Nina. That is not the most likely scenario but certainly can not be discounted. There is fairly good news with respect to the North American Monsoon (NAM).

The exact location of the Drought seems to be shifting a bit especially after this Summer. See the set of twelve overlapping three-month maps and my comments for details.

JAMSTEC Issues their Seasonal Outlook – May 13, 2022

By Sig Silber May 14, 2022weatherNo Comments

Usually, I compare the JAMSTEC forecast with the NOAA forecast after NOAA Issues its Seasonal Outlook. But this month, JAMSTEC was very early so I thought I would share it with everyone now. NOAA calls their predictions an outlook but JAMSTEC calls their predictions a forecast. I am going to show the JAMSTEC forecasts by month and by season and some of the indices they use in their model. They make world forecasts and for any readers who do not realize it, the U.S. is part of the world so it is covered by a world forecast. Of the two seasons that include our monsoon, I will extract the North American forecast from their world forecast and enlarge it.

I like the JAMSTEC forecast because the U.S. is part of the world and our weather is not independent of the worldwide weather pattern. In fact, most of U.S. weather originates in the Pacific Ocean and the Pacific Ocean is where Japan is located. In fact, Japan and the US jointly manage the monitoring system along the Equator that helps predict the phases of ENSO. So one of the reasons I include worldwide forecasts in articles is to encourage the understanding of worldwide weather patterns. It is not that the U.S. does not cooperate with other nations with respect to weather forecasts as it does. But to view weather forecasts on the Internet or TV you would not easily notice that. The U.S. pays hardly any attention to what other meteorological agencies predict.

For those interested in the U.S., the forecast for the Summer Monsoon and the overall placement of the drought is of interest. We will have the NOAA forecast this Thursday and it will be interesting to see the level of agreement or disagreement.

NOAA Updates the ENSO Forecast on May 12, 2022- Chances of a La Nina Three-peat are 61%

By Sig Silber May 13, 2022weatherNo Comments

On the second Thursday of every month, NOAA issues its analysis of the status of ENSO. This includes determining the Alert System Status. Although the current status remains the same i.e. La Nina Advisory, the forecast has been adjusted somewhat from last month. The forecast calls for the La Nina to continue. The timing is shown in the NOAA discussion and the IRI probability analysis. Of importance, the chances of a Triple Dip La Nina are still difficult to predict but seem to be slightly higher than the estimate last month. That would be a real disaster for the Southwest and the West Coast. The NOAA estimate for La Nina lasting into early Winter is 61%. This is a minority opinion in terms of other meteorological agencies almost all of which see La Nina ending sooner.

The impact of the NOAA forecast for the slow or non-existent transition from La Nina to ENSO Neutral will show up next Thursday when NOAA issues its Seasonal Outlook. The NOAA ENSO Status Update provides an advance indication of how the Outlook might change. There is a lag between the ENSO state and the impact on U.S. weather. Thus the exact strength of the La Nina may not be very important in terms of the actual impact on Summer weather including the North American Monsoon (NAM). We may see some changes farther out in the NOAA Outlook that will be issued next Thursday in particular Fall and Winter. Although the chances that this will happen are slightly less this month, the possibility of a Triple Dip should be of considerable concern. It most likely will be reflected in the Outlook issued next Thursday but perhaps not. We will learn more about what NOAA thinks next Thursday.

NOAA Updates their Outlook for May, 2022 – It is an improvement

By Sig Silber May 1, 2022weather2 Comments

At the end of every month, NOAA updates their Early Outlook for the following month which in this case is May. They also issue a drought outlook for the following month. We are reporting on that tonight. The updated Outlook is quite different from the Early Outlook which NOAA now calls the Mid-Month Outlook. It is overall less warm and less dry than the Mid-Month Outlook.

We provide partial-month outlooks for the first 27 days of May which allows us to validate if the Monthly Outlook is consistent with the partial month forecasts and it is. We also provide enough information for readers to understand any changes from the Mid-Month Outlook and we try to figure out why these changes were made. Most of the changes are explained in the NOAA discussion which is included in the article. The NOAA discussion describes the changes but does not provide a lot of insight into the reasons for the changes other than a change in the wave pattern that they describe as more troughing in the western Northern Tier. The partial-month forecasts that we have provided show how NOAA thinks this will play out as the weather pattern changes during May.

There is also a short discussion of the ENSO condition and it is looking less likely that there will be a Three-peat of the La Nina but that a near La Nina may be the more likely situation for Fall and Winter. Those forecasts can change but it looks like a marginally better situation with the focus on the words marginally better.