Sarah RoseATOC 1070: Lab 9 Boulder WindstormsSection 8Group: Ana, Ian, MikeACTIVITY AFoothills MesaElevation (m) 1625 1885 Peak Wind Gust (m/s) 45 44Time 6:00 am 10:00 amWind Direction 270 W 270 WPressure 815 mb 769 mbTemperature 7 deg C 7 deg CDew Pt. Temp. -7 dec C -6 deg CACTIVITY BFoothills MesaElevation (m) 1625 1885 Peak Wind Gust (m/s) 25 32Time 8:00 am 4:00 amWind Direction 300 W 240 WPressure 838 mb 808 mbTemperature 6 deg C 0 deg CDew Pt. Temp. -8 dec C -15 deg CQuestion 1At peak times the wind direction was west for both the Foothills and Mesa lab locations. The pressure was relatively low and it was warm and dry. The foothills lab location had the highest recorded gusts (45 m/s). Overall Mesa was more windy because of the variation in wind speeds and had higher average top wind speeds. If you look at the data collected at the Mesa lab around 11:00 there is a dramatic change. This change is due to the hydraulic jump. This hydraulic jump affect also occurs at the Foothills location at 24:00 when all pressure and wind speeds and direction begin to change rapidly. This is happening because the Chinook windstorm is ending and the atmosphere is returning to pre-storm pressures and wind speeds. The air-cools and becomes more humid signaling the end of the wind storms.Question 2At the time of the peak wind gusts for both locations the wind was blowing form the west. The pressures were relatively high at both locations and the weather was relatively warm and dry. Mesa has the strongest peak gust. Mesa was also the windier of the two locations, the data showed a lot more fluctuation and higheraverage top winds then the Foothills. Looking at the data at the time of 19:00 there’s a very clear change in humidity, both locations experience a rise in humidity as their temperature and dew point temperatures become closer together. Looking at that information we know that the Chinook is ending, the rise in humidity means the cooldry air that constitute a Chinook windstorm is gone. We can also look to the pressure to determine when the storm has ended, when the pressure returns to normal pre-storm levels we know that that storm is ending. Question 3The temperature at the house could be decreased by 5 degrees F by moving the boundary more upslope so that the cold air layer shifts towards the house on the diagram. Summary And ConclusionChinook windstorms are characterized by increasing warm, dry air coming from the west and decreased pressure. To determine when the Chinook from 10/29/1996 has ended we will look for that data that shows when the humidity rises and regular pressure levels as well as calmer winds perhaps ones that aren’t strictly coming from the west. On 10/29/1996 these indicators being at 24:00 and on 11/07/1996 this occurs at 19:00. The goal of this lab was to be able to look at data and identify key components of Chinook windstorms like slightly lower pressure and dry winds from west. Once we understood the conditions of a windstorm in action we then could identify when the storms ended by looking for increased humidity, decreased wind speeds and varied wind direction.Potential errors in this lab could come from the subjective ‘eye-ball’ guesstimating of exact data points. We didn’t use a straight edge or rule when we were recording key data points so we used our best judgment or rounded to the nearest notch on the graphs. Because I live in Boulder its good to understand this phenomenon specific to here, knowing what a Chinook is and how to identify them is important because theyare potentially