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Questions tagged [meteorology]

The study of how the earth's atmosphere works, including weather forecasting. Use this tag for questions about the earth's weather. When asking questions specifically about the atmosphere, also include the [atmosphere] tag.

2
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1answer
30 views

Where can I find a list of snow fall recording stations in my zip code?

Where can I find the locations on snow fall recording stations in a particular county or zip code? Is there a way that I can find an hour by hour history of snow fall? That is easy to do for water ...
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0answers
36 views

Figuring out the temperature at the tropopause

Either I am misunderstanding something, or reading conflicting information. Likely the former. First off, the tropopause is defined as the boundary between the troposphere and the stratosphere. That ...
6
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1answer
119 views

How much further can weather forecasting models go before the limits of Chaos Theory set in?

Refer to a report here that mentions the huge advancement in weather forecasting models since the 1980s: How much better? “A modern five-day forecast is as accurate as a one-day forecast was in ...
3
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2answers
101 views

Did temperature for the US state of Illinois reach an all-time record low 1/31/2019?

The State Climatologist Office for Illinois says the all time low temperature of Illinois was -36 °F, with a report of -37 °F in 2009 being disqualified. This morning, the station Sinnissippi ...
16
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2answers
4k views

Does the US National Weather Service use Celsius or Fahrenheit?

This tweet from the National Weather Service in LaCrosse, Wisconsin, USA says: We have officially hit -30 here at the NWS La Crosse office as of 520 a.m. The wind chill is -54. Be sure to dress ...
2
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0answers
24 views

How to plot orography for vertical profile of a certain variable along pressure levels in GRADS

I am using GRADS (1, 2, 3) to plot ERA reanalysis relative humidity profile for latitudinal average of 15N to 37N, and along the longitude from 40E to 130E. The orography is quite obvious and thus ...
9
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1answer
232 views

Unstable North Polar Vortex?

What would cause a polar vortex to become unstable a split into 3 smaller ones? How rare is this and what long term effects could this cause if the vortex stays unstable? http://www.severe-weather.eu/...
0
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1answer
45 views

Where can I find information about monthly seasonal change in a given area?

I have searched Google for almost an hour with no result. I'm looking for something like, "Indonesia, January to August is rain season, September to December is hot season". I can't use the old ...
6
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1answer
80 views

Is pollution a contributing factor to freezing rain?

I have been to different places with nearly the same freezing temperatures, around -2°C, but only at some specific places I repetitively experienced freezing rain. One common factor at these places ...
4
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1answer
180 views

Were there any polar vortexes in 2018?

Were there any polar vortexes in 2018? On what dates? I want to see what the weather looked like on those dates: https://www.youtube.com/watch?v=FPuDPxK88g0 Yes I know. You would think that I could ...
2
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0answers
39 views

What causes frozen “shooting water” spikes from ice covered water in the winter?

I have seen things like this appear once or twice on cold winter mornings, a frozen spike of water from an ice-covered container or very small body of water (puddle). I found the photo below at Mel ...
2
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1answer
49 views

Does wind chill work in deserts?

Wind chill works by removing the layer of heated air around your body. However in a hot area, say a desert, wouldn't the air around be hotter than your body or at least much closer to it than cold air?...
7
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1answer
208 views

Continuous lightning for over an hour; is this phenomenon common and does it have a name?

A few months ago, I witnessed something off the coast of Florida that I have never seen in my life. From my apartment, from about 10PM - 12AM, I saw pretty much continuous cloud to cloud lightning. I ...
3
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1answer
83 views

Circular rain cloud observed in rain radar

This circular rain pattern was observed in Sydney’s rain radar today. It remained for the entire loop, wiggling around a bit but mostly staying in the same place. The fact that it’s centred around ...
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0answers
51 views

How can I convert a CERA-20C total precipitation dataset of "monthly means of daily means' (edmo) to mm/month?

I downloaded an edmo dataset of 1 ensemble of the cera-20c model. I want to convert these data, which are in [m], to mm/month. Further specifications: 0.125/0.125 grid, -29/30/-30/31 area. Example of ...
0
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2answers
94 views

What happens if it rains above the boiling point of water?

The freezing point of water is 32°F. If it rains at a temperature lower than that, it will snow. However, let's say we dig a deep hole not filled with water that goes like 10,000 feet below sea level. ...
2
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0answers
25 views

What is the accepted measure for Wind Coherency (Strength and Direction)

I have wind data from a Met station (Speed and Direction), and I'm looking for a way to characterize a strong coherent wind. AKA - Wind that averages 12 m/s out of the East for 2 days would have a ...
13
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3answers
3k views

How is it possible to use up the water in a region?

The Dead Sea, rivers in California and the Aral Sea are said to be shrinking due to water usage, e.g. for agriculture. Yet the water must go somewhere. After the fields are irrigated, the water ...
2
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1answer
132 views

How to calculate Wind direction from uwind and vwind?

How to calculate wind direction from uwind and vwind? if uwind and vwind are -1.82 , -3.18 respectively
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0answers
33 views

how to calculate the average moisture flux over a period of time

I wanna calculate the average moisture flux over a period of time. For example the average moisture flux over an entire summer. I don't have a meteorological background. I have a conceptual confusion ...
3
votes
1answer
59 views

Is it certain that hundred year floods have finite variance?

It just occurred to me to ask this. It's easy to get a statistical distribution that does not have finite variance. For example, you can sometimes get that when the thing that is measured comes from ...
1
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1answer
195 views

WRF vertical integrated moisture flux using NCL

Does anyone know how to calculate the vertical integrated moisture flux using NCL in WRF. It would be best if you can share a NCL script. Here is my code, I used this code to calculate the averaged ...
3
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1answer
82 views

Are there “transparent” clouds?

Comments below this answer to the question Why are lightning towers at launch pads topped with big hollow tubes with spiral windings and not “lightning rod-shaped” lightning rods? link to a 2013 ...
2
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2answers
125 views

What is are the benefits of map 500 hPa geopotential for weather forecasting?

From the weather forecasting perspective: what is the main reason for showing just map of 500 hPa geopotential? Are there any practical or theoretical reasons? Why do not show 600 hPa geopotential or ...
5
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2answers
79 views

Does snow melt on ice?

I looked up nearly everywhere on the internet, but couldn't find any evidence that snow wouldn't melt because of ice. When I look it up, it instead tells me how salt can melt snow. I'm NOT looking up ...
0
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1answer
39 views

Projecting rectangular stereography centred on 42°N, 10°E

I am reposting from GIS Stack Exchange as here might also be someone who might help: I have a precipitation GRIB2 file obtained at EUMETSAT H-SAF I am able to decode it to ascii but the software I am ...
3
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0answers
85 views

Are global temperatures, specifically between the two hemispheres, in balance?

I've anecdotally but repeatedly observed a certain balance between temperatures in the two hemispheres. For example, early this year (2018), while Europe was under a late winter spell, weather here in ...
3
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0answers
35 views

Difference between GDAS and GFS data

What is the exact difference between GFS 0.25 and GDAS 0.25 data which is available in http://nomads.ncep.noaa.gov/. And are the GFS 0.5 and 1 degree data available in the above url and here the same?...
2
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0answers
27 views

Why do tethered aerostats have lower persistence than stratospheric balloons?

We have been thinking of using Aerostats/Balloons for an environmental monitoring project in our university. We have been considering 2 options: Tethered Aerostats (which fly upto 1 km) and ...
5
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1answer
56 views

Judging wind speed based on flags and inland-water observations

About a year ago, I took this video along the Hudson river in NY, and I'm trying to figure out the Beaufort number based on the water and the flags. https://www.youtube.com/watch?v=nqjvTALRWW8 The ...
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0answers
25 views

How to create Indonesian environmental conditions in India?

Need to create and maintain Biofloc for fish farming in India, it's really successful in Indonesia and I believe it's due to environmental conditions. Can we replicate the same in India?
4
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2answers
72 views

What's the default meaning of “Valid” in NOAA weather map?

NOAA weather forecast maps often include a valid time period, e.g: "valid from time1 thru time2." However, many maps only indicate a single time, e.g: "valid time1." In the absence of other ...
7
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1answer
76 views

Why don't tropical cyclones hit Hawaii?

Image by Wikipedia user Citynoise using NOAA data. If you look at this map of tropical cyclone tracks, you'll notice that there's a gap in the central northern Pacific where tropical cyclones ...
1
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1answer
99 views

If storms form above low pressure regions, why doesn't the eye of a hurricane, a low pressure region, have any storms?

If this is due to the Coriolis Effect, my other question would be how does the wind go upwards to form the storm clouds?
8
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1answer
177 views

Has a hurricane or cyclone ever reformed after passing over a large land mass?

Hurricane Michael recently hit Florida as a Category 4 storm, and after the remnants passed across a great deal of the east coast of the United States it appears to have re-emerged into the Atlantic ...
3
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1answer
45 views

On what basis are hurricanes,cyclones or typhoons named? [duplicate]

now its well known that common names are used to name weather storms but on what bases are they named ? is it the person who first notices them ? Is it the the most common name in the region where the ...
4
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0answers
76 views

How do the Madden Julian Oscillation (MJO) waves originate?

I was reading about tropical cyclones and tropical waves and there I saw a study mentioning its relationship with MJO activities. I saw several research papers which discuss about MJO waves. They only ...
2
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1answer
54 views

Deep sea pumps that work on wind power, can they control the weather?

If they used wind power to bring up cold water from far under the ocean in the day time and spray it on prevailing winds going into land, could they make it rain more in arid regions? What weather ...
3
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1answer
65 views

What kind of rock or stone is this? Where did it come from?

I found this on the side of the road in Oregon, i think it was left or forgoten about thats why it was left there but it has crystal pockets, multiple colors, some smooth sides, perfect circles and ...
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0answers
44 views

Are clouds more common at night?

Clouds obviously have a strong effect on surface temperatures. By blocking sunlight they can decrease the temperature by several degrees. At night they have a blanket effect that traps warm air and ...
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0answers
24 views

How to calculate water vapor budget for a selected region in GRADS or MAT Lab

I need to calculate water vapor budget for a selected region. Can anyone suggest a specific link or code for the above mentioned tools please. I have seen a link for NCL but i am not familiar with ...
0
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0answers
23 views

what changes in the weather prior to thuderstorms?

What changes in the weather prior to thunderstorms (day before, for example)? It seems humidity goes up and temperature but is there anything else?
3
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1answer
87 views

Why do hurricanes hitting the US East Coast seem to go north once hitting land?

Question says it all really. It appears that every hurricane hitting the US East Coast directs itself north once on land. Hurricane Florence is predicted to hit North Carolina then turn toward Canada ...
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0answers
41 views

What is the most powerful kind of extratropical cold core cyclone and why?

I want to understand what makes for a very strong extratropical cyclone. So which kind on Earth is the strongest in terms of windspeed or pressure? Southern ocean storms, nor'easter, European wind ...
4
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0answers
46 views

What colors can lightning be and what causes the different colors?

I've always thought of lightning as being either bright white or yellow in color. However, in the summer I've also seen lightning appear red as so called "heat lightning". What I'm wondering is what ...
1
vote
1answer
46 views

How would a particle travel in a hurricane?

How would a particle other then water travel in a hurricane? At what buoyancy or height would a small air born life preserver be safe from the ground in a hurricane? How fun would that be?
5
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3answers
139 views

Can weather radar be used to track swarms other than mayflies?

Along the Mississippi River swarms of emerging mayflies have been seen on radar. The radar and image below are from a July 11, 2017 emergence near LaCrosse, Wisconsin. On the radar you can see the ...
7
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1answer
95 views

Does the global temperature vary daily (hotter and colder days)?

Earth's current average global temperature (i.e. including hot deserts and cold polar caps) is reported be somewhere between 14°C and 16°C (depending on sources and methods). This temperature varies ...
7
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1answer
85 views

What are good metrics to compare climates?

I'm interested in visualizing climate data across the conterminous U.S. to determine regions that I would be interested in living in. So far, I've pulled in NOAA data, and I've: averaged the maximum ...
3
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1answer
45 views

Why can't the meteorologists predict for sure if the day would be rainy even on the beginning of the day sometimes?

Why do the meteorologists still cannot predict if a day would be rainy or cloudy or blizzardy even on the beginning of the day sometimes? My life circles around weather and an avid weather watcher. ...