Presentation on theme: "What is a Synoptic Weather Map?"— Presentation transcript:
1What is a Synoptic Weather Map? Station Models andConverting Station Pressure into Millibars
2Synoptic Weather MapsSynoptic weather maps: Show atmospheric quantities like temp, air pressure and precip. at a particular time and over a large geographic area- used to make weather predictions
3Why?- Do Not WriteStation models and pressure are key components for making an accurate forecast-For example, if you are making a forecast for the New York Yankees and you say, “There is a 20% chance of rain” but it is already raining, you probably won’t be forecasting for the New York Yankees for much longer!At least 1 question on the Regents is about station models and at least one question on the Regents asks you to convert station model data to millibars
4Station ModelsUsed on weather maps to show the current weather conditions for a particular location
7Cloud Cover and WindsThe circle at the center shows the amount of cloud coverThe “flag pole” coming out of the circle shows the direction that the wind is coming from
8Each “feather” shows approximate wind speed Each “feather” shows approximate wind speed. A half feather shows an approx. 5 knot wind, and a whole feather shows an approx. 10 knot wind*Add up the amount for each flag for the total wind speed
10Determining Air Pressure Air pressure is shown by using the last 3 digits of the pressure in millibars (coded)Ex mb = 186 on the station model
11To determine the air pressure from the numbers on the station model, use the following rule: If the first number is 5 or less, put a 10 in front of it
12If the first number is 6 or higher, put a 9 in front of it Put the decimal point between the last two numbersAdd “mb” at the end for units
13ExampleThe air pressure on a station model is 892. What is the pressure in millibars?ASK YOURSELF….Is the first number 5 or less?After you add the number in front of 892, where does the decimal go?
14**Remember, surface air pressure is usually between 960mb – 1050mb If your answer is not in this range, then it is wrong. Check your work!
15Another ExampleWhat is the pressure of this station in millibars?
16Practice with Station Models Take two minutes to use your Reference Tables and the information below, draw the station model of Slate Hill. Compare your answer with your neighbor.
17Slate Hill Observations: Cloudy, 61. F, 58. DP, 8 Slate Hill Observations: Cloudy, 61*F, 58* DP, 8.0 mile visibility, pressure is mb, wind speed 9 mph, from SW.
18Your station model should look something like this…
19How about decoding station models? Take the next few minutes to write down the weather information that is given by the station model.
20You should be able to answer the following questions: What is the temperature? What is the dewpoint? What is the pressure in millibars? How much precipitation fell in the past 6 hours? What is the visibility? What is the present weather?
21Example Regents Questions 1. A weather station model is shown below.What is the barometric pressure indicated by this station model?(1) mb (2) mb (3) mb (4) mb
222. Which station model shows the correct form for indicating a northwest wind at 25 knots and an air pressure of mb?
24RADARRadar: reflects radio electromagnetic energy off the aerosols of precipitation and clouds.Radar provides a tool accurate short-range prediction, showing precipitation intensity, precipitation type, and where it is heading.
26Review of How to Interpret Weather Station Data What is the temperature of each station?What is the dew point of each station?What is the wind direction of the stations?Which station model has higher pressure and why?