Weather Map…Without Data!

What data are necessary? Temperature Cloud Cover Wind Visibility Air Pressure Present Weather Precipitation Humidity How can all these be put in such a small spot?

The Weather Station Model

How to MAKE and READ a STATION MODEL TURN TO ESRT p 13 NOW!! Temperature… Simply read the temperature… Cloud Cover…75% cloud cover Visibility… ½ mile Humidity… Read the Dewpoint 27oF Precipitation… 0.25 inches in the last 6 hours

But any one of these symbols might be used! What was the present weather on the station model? But any one of these symbols might be used!

WIND 5 10 FROM the SW NE at 25 Knots E at 5 Knots SE at 10 Knots

Barometric Pressure or AIR PRESSURE Now we’ll crack the code! It is written in a secret code on the station model… Now we’ll crack the code!

196 19.6 1019.6 969 96.9 996.9 Decoding the Coded Pressure Example code… 196 Insert a decimal between last 2 digits 19.6 If 1st digit is between 0 and 5 put a 10 in front! 1019.6 The actual barometric pressure is 1019.6 millibars (mb) How many “inches” is that? Example Code: 969 Insert a decimal between last 2 digits 96.9 If 1st digit is between 6 and 9, put a 9 in front! 996.9 The actual barometric pressure is 996.9 millibars (mb) How many “inches” is that? 1000.2 999.3 Decode these Station 002 993 Model pressures: 280 000 It’s a SNAP! 1028.0 1000.0

19 means the pressure has changed by 1.9 mb The Barometric Pressure Trend + means Higher now than 3 hours ago - means Lower now than 3 hours ago 19 means the pressure has changed by 1.9 mb / means pressure is rising \ means pressure is falling “The pressure is 1.9 mb higher and rising”

What are the conditions shown by the model? Temperature= 45F Dewpoint= 32F Wind NE at 20 knots Overcast Rain Showers Pressure Now= 997.3 mb Pressure has fallen 2.9mb in the past 3 hours Precipitation in last 6 hrs.= .53 in.

Encoding the Pressure 1013.5 Remove the decimal point from the actual pressure 10135 The last 3 digits are the code to use for the station model! 135 Actual Pressure 1013.5 = 135 pressure code Encode these pressures: 1032.7 987.3 1012.2 1000.1 327 873 122 001 ©S. Kluge 2007