Dr. Jeff Masters' WunderBlog |
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| Posted by: Dr. Jeff Masters, 13:28 GMT le 13 juin 2007 | +3 |
F5: Devastation, Survival, and the Most Violent Tornado Outbreak of the 20th Century tells a story from the world's most violent tornado outbreak on record--the April 4, 1974 Super Outbreak. The Super Outbreak featured the most tornadoes ever recorded in a single day, 148, and also had an unprecedented number of violent F4 and F5 tornadoes--six F5 tornadoes and 24 F4 tornadoes (for comparison, the past five years have had one F5 tornado and 15 F4 tornadoes.)| Permalink | A A A |
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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
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NORTH ATLANTIC IMAGERY
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New news on that today, they pushed gettting the replacement up there back to 2016.
Gotta agree with ya~ something should be done way sooner.
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A scatterometer is a microwave radar sensor used to measure the reflection or scattering effect produced while scanning the surface of the earth from an aircraft or a satellite.
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Data derived from ocean scatterometers is vital to scientists in the their studies of air-sea interaction and ocean circulation, and their effects on weather patterns and global climate. These data are also useful in the study of unusual weather phenomena such as El Niño, the long-term effects of deforestation on our rain forests, and changes in the sea-ice masses around the polar regions. These all play a central role in regulating global climate.
Computer modeling of global atmospheric dynamics for the purpose of weather forecasting has become an increasingly important tool to meteorologists. Scatterometer data, with wide swath coverage, have been shown to significantly improve the forecast accuracy of these models. By combining scatterometer data of ocean-surface wind speed and direction with measurements from other scientific instruments, scientists gather information to help us better understand the mechanisms of global climate change and weather patterns.
Iam not to sure what you guys are watching but its looks rather wet for florida the next few days with this rain coming up from the caribbean during this weekend.Windshear is fairly high across the NW Caribbean and the gulf and all this convection looks to be from a very weak wave in the vicinity interacting with an ULL over the eastern bay of campeche.Dont see anything developing right now but conditions might become more favorable in the next 7-10 days and looks to be an area to moniter which is quite normal for this time of the year.Adrian
we are just discssing the models. they have something spinning up in the Caribbean.
anybody see a trend here??
hopefully short term that is!
God we need rain...
guys i told you their will be no tropical activity to speak of for the rest of june"
Is that written in stone? LOL
What do the colors mean in the reflectivity products?
Clear Air dBZ Scale Precipitation dBZ Scale
The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. "Reflectivity" is the amount of transmitted power returned to the radar receiver. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used.
dBZ Rainrate
(in/hr)
65 16+
60 8.00
55 4.00
52 2.50
47 1.25
41 0.50
36 0.25
30 0.10
20 Trace
The dBZ values increase as the strength of the signal returned to the radar increases. Each reflectivity image you see includes one of two color scales. One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). Notice the color on each scale remains the same in both operational modes, only the values change. The value of the dBZ depends upon the mode the radar is in at the time the image was created.
The scale of dBZ values is also related to the intensity of rainfall. Typically, light rain is occurring when the dBZ value reaches 20. The higher the dBZ, the stronger the rainrate. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values.
These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Hail is a good reflector of energy and will return very high dBZ values. Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall.
lol, you can't forget that the GFDL sees something spinning up and moving into NW Fl.
God we need rain...
yea even though that model run was from yesterday the GFDL is a very good model.
Rain looks very likely for miami dade and broward counties through atleast saturday with 60 percent tommorow growing to a 70-80 percent by friday and saturday.
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