I'm Blogging Again!

This time on our corporate site but I think you will still find my posts with just as much scientific content. Please go to WANE dot com.

I'm Blogging Again!

This time on our corporate site but I think you will still find my posts with just as much scientific content. Please go to http://blogs.wane.com

Green or Global?

Okay, I know I get some oddball comments for this post, but this opinion is shared by many of us who have degrees in atmospheric sciences. I don't know if I go to the extreme that John Coleman does but it certainly is a good read. Mr. Coleman is the founder of the weather channel, so he has some impressive credentials. Here is his take on global warming.

Closed low moves out

A much better looking weather picture for the next several days. We have been dealing with a couple of anomalies which keep clouds and showers around for quite a while. First let's talk about a closed low or cut off low. Here is the definition from the National Weather Service:

Cutoff Low

A closed low which has become completely displaced (cut off) from basic westerly current, and moves independently of that current. Cutoff lows may remain nearly stationary for days, or on occasion may move westward opposite to the prevailing flow aloft (i.e., retrogression).

"Cutoff low" and "closed low" often are used interchangeably to describe low pressure centers aloft. However, not all closed lows are completely removed from the influence of the basic westerlies. Therefore, the recommended usage of the terms is to reserve the use of "cutoff low" only to those closed lows which clearly are detached completely from the westerlies.

so basically we talking about low pressure that doesn't have jet stream winds to push it along and unlike most weather systems which move through within a day and the weather improves quickly the next day. This part of the country is plagued with these kinds of low pressure areas and they get stuck in the doldrums of very little movement in upper air winds of the jet stream.

From Dan McAfee in Fort Wayne. Nice pictures Dan!

Temperatures Tumble to Begin Week

A very chilly start to the day but southwest winds are going to bring in some warmer air with highs moving into the 50s. But the biggest problem for the next two days is going to be the rain. Showers will continue to be pushed northward by stubborn low pressure which will move gradually to the east over the next 36 to 48 hours. Most of the next two day will be kept in the clouds as well.

You can see the low parked across the area and that's the main factor for today and tomorrow. You can also see the QPF which is bringing in about another .50 to 75" of rainfall through Tuesday afternoon.

Mild air will finally be moving in across the area today as a smaller 'bubble' of high pressure will set up in the Great Lakes Region
You can see on this surface map that there is a lot going on around us. Low pressure to our west and east, but finally some high pressure blocking any cloud cover and changing very little over the next 3 days. That's about all you can hope for right now as we have a very fast moving jet stream. Okay, so I know this is going to be a little mind expanding and I apologize for it in advance, but I wanted to show you the 200 mb chart. This is the place where the jet stream resides. You can see by the legend that we do have 100 knot winds pushing weather systems through very quickly. Right now that jet is driving the fastest moving air to the north. High pressure is also a factor in pushing this jet stream north. There's always been a debate in meteorology on whether the jet stream steers high and low pressure or low and high pressure steer the jet stream.

A bit better today

It will be a bit more moderate in the temperature department today with highs building into the lower 50s. There's still a stubborn area of low pressure to our east that will still bring clouds into the picture. If you have a chance to look at a looping satellite picture today do it. It's a great lesson in what low pressure is. I can talk until I'm blue in the face about the wind flow around low pressure and the fact that a 'cyclonic flow' moves air upward and that's how the process of cloud making begins. (Along with the water cycle process). But this actually shows that flow of air.

Another day of clouds and showers

Yesterday was pretty much as expected, gusty winds of up to 47 mph, heavy rainfall with rainfall amounts up to .75". Today is not going to be much different, a strong low pressure system will stay south of the state early today and into the middle of the afternoon with begin to move east. The low pressure is going to act like a pumping mechanism bring moisture up to our area through the day and overnight hours. Until this low moves east we'll continue to see gusty winds and showers.

After this weather system passes warmer temperatures are on the way. In fact, we could see highs top out in the upper 60s through the end of the week. Sunday and Monday look like a very different story.
Sunday another wave of low pressure comes in from the south. While it looks like warm air advection in front of this system it's another story by Monday morning.
You can see 850 mb temperatures drop into -6 to -10. That's moderately colder air for this time of year and we'll have to watch to see if this moderates at all over the next couple of days.

It's Back

For all who think I had forgotten how to blog you may be correct. Sorry for the lapse, I'll try to get a daily synopsis out here for you and open up for discussion. Today is a good day to begin, (again). We've seen a series of low pressure systems coming out of the southwest the last two weeks. A couple of things to watch with these weather systems.
I'm a little concern with the QPF map putting a 'bulls eye' right across the northern part of the state. It has 1.30" of rain. That's not good news as the ground is still saturated from the six plus inches we've had in the last 20 days.
Here is the surface analysis for today. You can see that low pressure is being forced north by a fast moving jet stream. This strong jet stream is left over from our cold winter and is going to be a factor through the early part of the spring and may linger into early summer. Because of these factors we could see some violent spring weather across the south. Don't be surprised to hear about more tornadoes across the south today and tomorrow.
Here is the jet stream pattern for this week. For today you can see there is a real dip across the central part of the U.S. This is being caused by low pressure which will bring quite a bit of instability to what we traditionally call 'tornado alley' later today.

For us, I think heavy rain is about as severe as it will get around here. You can see the jet stream improving and moving north later in the week. That will be the return of high pressure which will greet us with sunshine after tomorrow.

Video forecast

NOAA Unveils New Alert System for La Niña and El Niño

La Niña Likely to Continue into Spring

February 5, 2009

Pacific Sea Surface Temperature Animation (Nov. 12, 2008 to Jan. 28, 2009).

High resolution (Credit: NOAA)

NOAA’s Climate Prediction Center today issued the first La Niña advisory under its new El Niño Southern Oscillation (ENSO) Alert System. Forecasters expect La Niña to influence weather patterns across the United States during the remainder of the winter and into the early spring.

Defined as cooler than normal sea surface temperatures in the central and eastern equatorial Pacific Ocean, La Niña impacts the weather globally. La Niña’s opposite is El Niño, or warmer than normal ocean temperatures. These changes in ocean temperatures alter the tropical wind and rainfall patterns with far reaching implications.

“The typical weather patterns associated with La Niña and El Niño affect many industries including agriculture, transportation, energy, shipping and construction,” said Michael S. Halpert, deputy director of the Climate Prediction Center. “The ENSO Alert System will succinctly inform industry, government agencies, academia and the public about the onset and status of La Niña and El Niño. This system will also help decision makers plan for the potential effects presented by these conditions.”

La Niña conditions have been present since late December, but it is too early to say exactly how strong the event will be and precisely how long it will last. However, for the next few months La Niña is expected to bring milder and drier than average conditions to the southeastern and southwestern states. It is also expected to bring wetter-than-average conditions to the Ohio and Tennessee valleys, and cooler than average temperatures to the Pacific Northwest.

The new ENSO alert system includes La Niña and El Niño watches and advisories which the Climate Prediction Center will issue when specific conditions exist.

• La Niña or El Niño Watch: conditions in the equatorial Pacific are favorable for the development of La Niña or El Niño conditions in the next three months.
• La Niña or El Niño Advisory: La Niña or El Niño conditions have developed and are expected to continue.

These watches and advisories are now part of the ENSO Diagnostic Discussion, which is issued by the Climate Prediction Center on the Thursday falling between the 5th and 11th of every month. It is available online.

NOAA understands and predicts changes in the Earth's environment, from the depths of the ocean to the surface of the sun, and conserves and manages our coastal and marine resources.

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Ice Storm Pictures

Here are northern Kentucky ice storm pictures. The ice storm was followed by 3 inches of snow. Credit goes to my former intern and now weatherguy in Bowling Green Kentucky and his father.

Snow...Let it End...Snowfall totals right now are about 5.7" at Fort Wayne Airport. In other areas south of Fort Wayne the heaviest snowfall we can find is approaching six inches. The snowfall cut off is really the northern side of Allen county. The north side of the county getting about 3". Eastern and northern counties to Fort Wayne getting about 1" so the cut off is very sharp. The snowfall should end by the middle of the morning. The line of snow is quickly ending across the western side of the state.

Let it Snow? Snow is back into the picture here and it's a tricky little system. Let me explain my thinking by first pointing to why the weather service is forecasting a heavy snow. One of the numerical models is putting out 5 plus inches for the Fort Wayne area. The GFS-NAM model is putting this information. Many times I see this model over-doing precipitation, especially with snowfall forecasts. Here is my thinking on this one.










You can see in the 48 hour 850 mb plot that the low which will be responsible for this storm is well across the Northeast. I don't believe it travels far enough to the north and east for us to get into the heaviest snowfall. In fact, I put it on more of a Cincy to Buffalo track. This would bring snowfall in but would relegate the heaviest snowfall south of Fort Wayne. Maybe Bluffton on south ward may get 4 inches of snow. South of that especially in the Muncie are we could be looking at about 6"

Here is one of the models we use here at the weather center it's called Addonis and we call it Futurecast on TV. It shows the low across southern Kentucky. More importantly it takes it on a southward track.

Take a look at this snap shot early Wednesday morning. The track takes it south of Columbus, Ohio. That would put the heaviest snowfall south of our area.










Cold air will be back after that through Friday morning as 850 Celisus temperatures drop to around -12 degrees.

Arctic air coming in for another visit: Let's enjoy today and early tomorrow as much as we can because that unwanted relative from the north is coming in for another visit.
You can actually see the mild air coming for a visit today with 850 mb temperatures near +3! Okay, so here's the other shoe...and it's big one. This usually happens ahead of an arctic weather system as that gateway to the north will be opened by another 'clipper' type weather system moves through the area and changes the flow to a north flow which opens up that arctic gateway.
You can see the cusp of the cold air moving in late Friday behind the clipper system with temperatures of -14 to -22 Celsius coming into northern Indiana by Friday evening.
It's not the core of the coldest air but it is certainly formidable as the coldest air (-50 C) sits in southern Canada and northern Michigan. But a couple of things really don't bode well for a quick moderation in temperatures. One is that the cold air is moving across an area which snow covers the ground. That makes it nearly impossible to moderate temperatures. The other is that the core of cold air is not far from the air mass we will be experiencing.

Cold start: We are not seeing the bitter cold air that we saw last week, but still moderately cold with 850 mb temperatures around -16 Celsius. So even with sunshine it's doubtful that we will make it past 20 degrees this afternoon.

You can still see the arctic still opened up through Tuesday morning. That gateway will allow for another cold day Tuesday as well.

Mid-Week Warm up:
On Thursday morning you can see the cold air retreat up towards northern Canada. The gate way closes a bit with warmer air coming in. The core of the coldest air is back in the polar regions of the world.

Another Shot of Cold Air: It doesn't last though with another 'clipper' system coming in on Friday with snow chances and especially more cold air. You can see the low the moves across Ohio and to the east coast.

The core of the coldest air comes down from the north again to southern Canada. This is a little troubling as we will see cold air through the weekend. Not as cold as last week but still very cold. A word of caution here, this is the only model carrying the cold air. As usual we'll wait for the other models to come around to this solution.

Wind Chills

Wind chills: Before we talk about today's weather I want to blog about wind chills. I hear people get really excited about wind chill temperatures and how cold it is. I want to remind you that wind chill is a value or perceived temperature. The formula has been changed recently because the old formula was based on water and not on exposed skin. Just for fun here is old and new the formula.

Wind chill temperature = 35.74 + 0.6215T - 35.75V (**0.16) + 0.4275TV(**0.16)

In the formula, V is in the wind speed in statute miles per hour, and T is the temperature in degrees Fahrenheit.

Note: In the formula, ** means the following term is an exponent (i.e. 10**(0.5 ) means 10 to the 0.5 power, or the square root of V), - means to subtract, + means to add. A letter next to a number means to multiply that quantity represented by the letter by the number. The standard rules of algebra apply.

For reference, the old wind chill formula was:

T(wc) = 0.0817(3.71V**0.5 + 5.81 -0.25V)(T - 91.4) + 91.4

Source for both formulas: The National Weather Service

By the way wind chill only applies to people and animals not objects.

Snow is heavy Snowfall has been surprisingly heavy this morning and it looks to continue for a few more hours early this afternoon. Snowfall amounts at the station are close to 3 inches. It looks like we could see anywhere from 3 to 5 inches from Fort Wayne south.

Another shot of snow: A clipper system will move across the area today. These clipper system have a couple of common characteristics. One, they bring limited moisture because there is no inflow from the Gulf of Mexico. The second is that they are fast moving systems.

Can it be too cold for snow? Nope it can snow at any temperature. As the temperature gets colder the snow grain gets smaller because the colder the air is the less moisture the air can hold.

It stays cold: You can see this red color on this 850 mb map. It depicts -26 Celsius. That's bitter cold.
The cold air stays in place through Saturday. Here's Saturday morning with 850 mb temperatures still -26 Celsius.