1. WEEK 3: 10 SEP 2019 Reminder: Class notes
UTC Time (suppl. Lecture notes)
Weather review – Hurricane Florence, TS Olivia;
Weather observations (suppl. Lecture notes)
Weather Station model
Weather Station Model; (in class assignment)
Weather Maps
Introduction to Tornadoes (suppl. Lecture notes)

3. Weather Symbols and Maps

4. Station model 80
021
-23 63

5. Weather Symbols

6. Sky Symbols

7. Wind Symbols

8. Pressure Tendency

9. Station model 80
021
-23 63

10. Station model 80
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Temperature
Surface: ºF
Upper air: ºC

11. Station model 80 021 -23 63 Dew point temperature Surface: ºF
Upper air: ºC

12. Station model 80 021 -23 63 Total sky cover ** Depicted by shading
in circle

13. Station model 80 021 -23 63 Current weather conditions
** If blank, “no weather”

14. Station model 80
021
-23 63
Wind direction – of wind toward center

15. Station model 80 021 -23 63 Wind speed Long barb = 10 knots
Short barb = 5 knots
Flag = 50 knots
** Notice range of wind speeds (i.e., knots)

16. Station model 80 021 -23 63 Sea level pressure
**If first number is 5 or greater, then place 9 in front
--Otherwise, place 10 in front
**Place decimal point between last two numbers
Example above: hPa

17. Station model 80
021
-23 63
Change in surface pressure during last 3 hours
** In tenths of mb
** Line describes how pressure changes over time from left to right

18. 76 953 +16 65 Example 1 Temperature: 76 ºF Dew point: 65 ºF
Sky cover: Completely overcast
Current weather: Light rain
Wind direction and speed: Southwest at 15 knots
Sea level pressure: mb
Pressure tendency: Increase of 1.6 mb; rising steadily 76
953
+16 65

19. Example 2 Temperature: 10ºF Dew point: 8ºF Sky cover: 7/10 or 8/10
Current weather: Snow shower
Wind direction and speed: North at 3-7 knots
Sea level pressure: mb
Pressure tendency: Decrease of 0.4 mb; falling, then steady

20. Weather Station Model
In-class assignment

21. WEATHER MAPS

22. High & Low Pressure Systems
Air pressure Patterns are main organizing feature
Circulation in Northern Hemisphere
Clockwise around Highs (H)
CCW around Lows (L)
Clouds & Precip around Lows
Temperature patterns result from latitude, wind flow and cloud cover

23. Boundary between Different Air Masses
Plotting Fronts
Boundary between Different Air Masses
Types of Fronts

24. Weather Maps

25. ISOPLETHS

26. Contour Maps

27. Contour Maps

28. Contour Maps

29. Weather Maps

30. Weather Maps

31. Weather Maps

32. Weather Maps

33. ISOTACHS

34. ISOTACHS

35. ISOHYET

36. Isallobar = pressure change per time Isotherm = temperature*
ISOPLETHS
Connects all points that have the same value
Iso = equal (Greek)
Also called “Isolines”
Types
Isobar = pressure*
Isallobar = pressure change per time
Isotherm = temperature*
Isohyet = rainfall*
Isonif = snowfall
isotach = wind speed*

38. READING ASSIGNMENT For weeks 3 & 4: TUE, SEP. 10th ,17th
Pielke and Pielke; Up through Chp 1 (Point of view: societal impacts should partially dictate the direction of scientific research and governmental response)
Simmons and Sutter: Foreward and Chp 1(Point of view: societal impacts should partially dictate the direction of scientific research and governmental response)
Williams: Chp 2; Chapter 3 (up through p. 36); Chapter 5, 63-72; Chapter 9 (Hurricanes)
Zebrowski: Chapter 2 (Point of view; how the scientists do research--the scientific method)