Station Models How Meteorologist can look at a
- Slides: 37
Station Models How Meteorologist can look at a lot of cities’ data at once!
Temperature information in degrees Fahrenheit. Temp No LABEL: ex 70 degrees Fahrenheit 70
Dew Point Temperature in degrees Fahrenheit. Temp dewpt No LABEL: ex 70 degrees Fahrenheit with a Dp of 60 degrees Fahrenheit 70 60
Total amount of cloud graphic depiction of percentage of the sky covered by clouds
no clouds about 60% about 10% about 75% about 25% about 80% about 40% completely overcast about 50% sky obscured
What is the present weather? Found here! The current weather is very important. A detailed set of symbols provides weather descriptions.
100 different symbols provide details about the PRESENT WEATHER.
Samples of present weather symbols. fog haze , thunderst orm drizzle lightnin g rain * snow slight rain showers. ice or snow pellets cloud development not observed
Intensity of Weather Conditions Sometimes to show higher/lower intensity more/less of the same symbol is used
Wind direction A staff is rotated around the station. Remember, winds are identified as the direction FROM which they come. This would be a (WNW) west northwest wind or about 290º.
Wind Speed Attached to the staff are symbols for speed.
The coding for the wind speed symbols can be generalized as: half staff about 5 knots note, it is not on the end of the wind direction staff full staff about 10 knots these are additive for the total amounts three full staffs=30 knots
Current Barometric Pressure pressure Always is shown as a 3 digit number. They represent the tens, ones and tenths place. Ex. 1013. 4 mb = 134
Barometric Pressure is VERY important! average barometric pressure at sea level is 1013. 25 mb. current barometric pressure is reported to the nearest TENTH BUT, they don’t want to waste space
average barometric pressure at sea level is 1013. 25 mb. barometric pressure varies around this value + about 30 = 1043 somewhat higher 1013. 3 somewhat lower - about 30 = 983
average barometric pressure at sea level is 1013. 25 mb. barometric pressure varies around this value they do not PRINT the beginning number or numbers ---1013. 3 x 133 they, also, do not PRINT the decimal point, but report to the nearest TENTH
How would each of these pressures be recorded on a station model? 1014. 9 mb 1010. 5 mb 1000. 3 mb 987. 6 mb 1010 mb 1000 mb
How would each of these pressures be recorded on a station model? 1014. 9 1010. 5 1000. 3 987. 6 1010 0 1000 0 mb mb mb 149 105 003 879 100 000
From the three numbers, you must INTERPRET whether the preceding value is 10 or 9 Which would make the value most realistic?
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 999 GREATER than 5, place a 9 before it. and add a decimal between the last two digits 999. 9 mb
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 842 GREATER than 5, place a 9 before it. and add a decimal between the last two digits 984. 2 mb
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 731 GREATER than 5, place a 9 before it. and add a decimal between the last two digits 973. 1 mb
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 600 GREATER than 5, place a 9 before it. and add a decimal between the last two digits 960. 0 mb
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 599 1059. 9 mb LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 406 1040. 6 mb LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 024 1002. 4 mb LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits
What the value on the station model represents: GREATER than 5, place a 9 before it. LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits 000 1000. 0 mb LESS THAN or EQUAL to 5, place a 10 before it and add a decimal between the last two digits
Therefore, the LARGEST barometric pressure represented on a station model is 1059. 9 mb and is recorded on a station model as 599
And the SMALLEST barometric pressure represented on a station model is 960. 0 mb and is recorded as 600
Pressure Summary Shown on a station Model: 600 700 900 Think like a video game or 999 odometer that gets too 000 large and starts back at 0! 100 599 Equals: 960. 0 mb 970. 0 mb 999. 9 mb 1000. 0 mb 1010. 0 mb 1059. 9 mb
Not only is the pressure itself important, but so is the way the pressure has been changing. So, more information may be given and must be coded.
How much the pressure has changed Pressure trend change The pattern and amount of change in the past three hours Again, reported in TENTHS without the decimal or label + it is higher now than in the past - it is lower now than in the past
How would the following barometric trends be recorded on a station model? Over the past 3 hours, the pressure has been steadily increasing at a rate of 1. 2 mb 1 mb 0. 9 mb
steadily increasing means a “+” symbol followed by the ones and tenths place (no decimal or label) then the symbol 1. 2 mb = +12/ 1 mb = +10/ 0. 9 mb = +09/
Other info: Visibility is given in miles and fractions Amount of precipitation is plotted in inches to the nearest hundredth of an inch.
Draw a Station Model for These Conditions: Temperature= 45 F Dewpoint= 32 F Wind NE at 20 knots Overcast Visibility= 1. 5 miles Rain Showers Pressure Now= 997. 3 mb Pressure 3 hrs. ago= 1000. 2 mb Barometer Falling Precipitation in last 6 hrs. =. 53 in. Back to the Station Model ©S. Kluge 2007
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