HOW WELL CAN YOU PREDICT THE WEATHER?
CREATED BY CHARLES BURROWS
It is possible to make accurate 24-hour weather forecasts if you know the current SEA LEVEL PRESSURE, PRESSURE TREND, SURFACE WIND DIRECTION, and the SKY CONDITION. Give it a try!
Sea Level Pressure
(mb)
Pressure Trend Surface Wind Direction Sky Condition
AND THE 24-HOUR WEATHER FORECAST IS...
Instant Weather Forecast Chart

Sea Level Pressure

Pressure Tendency

Surface Wind Direction

Sky Condition

24-Hour Weather Forecast
*see codes below

1023 or higher

rising, steady, or falling

any direction

clear, high clouds

1,18

1022 to 1016

rising or steady

SW, W, NW, N

clear, high clouds

1,18

falling

SW, S, SE

clear, high clouds

1,3,17,5

SW, S, SE

middle or low clouds

6,17

E,NE

middle or low clouds

6,14

clear or high clouds

3,5,14

1015 to 1009

rising

SW, W, NW, N

clear

1,14

overcast

2,16

precipitation

11,2,16

falling

any direction

clear

3,17,or 1,15

SW, S, SE

high clouds

3,17,5

SW, S, SE

middle or low clouds

7

E,NE

middle or low clouds

7,12,14

SE, E, NE

overcast, precipitation

9

S,SW

overcast, precipitation

10,13

1008 or below

rising

SW, W, NW, N

clear

1,12

overcast

2,12,16

overcast, precipitation

11,12,16

NE

overcast

4,12,13,14

overcast, precipitation

11,12,13,14

falling

SW, S, SE

clear

3,6,8,12,15

overcast

7,8,12,13

overcast, precipitation

8,10,12,13,16

N

overcast

4,14

E,NE

overcast

7,12,14

overcast, precipitation

8,9,12,13

*24-Hour Weather Forecast Codes

1 = clear or scattered clouds

10 = precipitation ending within 12 hours

2 = clearing

11 = precipitation ending within 6 hours

3 = increasing clouds

12 = windy

4 = continued overcast

13 = possible wind shift to W,NW, or N

5 = precipitation possible within 24 hours

14 = continued cool or cold

6 = precipitation possible within 12 hours

15 = continued mild or warm

7 = precipitation possible within 8 hours

16 = turning colder

8 = possible period of heavy precipitation

17 = slowing rising temperatures

9 = precipitation continuing

18 = little temperature change

"Instant Weather Forecast Chart" from: http://www.geology.udel.edu/~jmadsen/113_lab_weather.html