3-11. How  do  pressure  changes  associated with  a  thunderstorm  influence aircraft  altimeter  readings? 1. The  altimeter  reading  decreases as  the  storm  approaches  and remains low until the storm moves  away 2. The  altimeter  reading  increases as the storm approaches, decreases while in the rain showers,    and returns to normal as the storm moves away 3. The  altimeter  reading  decreases in the cumulus stage of the thunderstorm,    increases in the mature stage of the thunderstorm,    and returns to normal  in  the  dissipation  stage 4. The  altimeter  reflects decreasing  altitudes  as  the aircraft  approaches  the thunderstorm,   increased altitude  as  the  aircraft  flies through the rain, and returns to normal as the aircraft flies away  from  the  storm 3-12. A  pilot  sets  the  altimeter immediately before the passage of a thunderstorm. Following  the passage  of  the  thunderstorm,  what should  the  altimeter  read? 1. High 2. Low 3. Accurate 3-13. When  the  parcel  method  is  analyzed on a Skew T log P diagram and used to  forecast  thunderstorms,  which  of the  following  statements  is  valid? 1. With a large positive area, thunderstorms  may  be  forecast with a high degree of confidence 2. When  thunderstorms  are  not indicated,  you  may  safely assume  that  no  thunderstorms will  occur 3. The  parcel  method  gives  little indication  of  stability  or instability when used alone as a  forecasting  aid 4. The size of the positive area is a good indication of instability, but other factors, such as the distribution of low tropospheric  moisture,  should be  considered 3-14. Which  parcel  method  condition,  when considered  alone,  would  NOT  be favorable  for  thunderstorm development? 1. The  negative  energy  area exceeds  the  positive  energy area 2. The  positive  energy  area exceeds  the  negative  energy area 3. An ample supply of moisture is uniformly   distributed throughout  the  lower troposphere 4. The parcel will rise to a temperature  level  of  -10°C IN  ANSWERING  QUESTION  3-15,  REFER  TO FIGURE 5-3 IN YOUR TRAMAN. 3-15. From an analysis of figure 5-3, you should draw which of the following conclusions? 1. The base of the inversion can be safely assumed to be the top of  cumulus  activity 2. Sufficient  heating  during  the day will dissipate the low- level  inversion;  therefore,  a forecast  of  thunderstorm activity may be made 3. In spite of favorable lapse rate  conditions,  there  is insufficient  moisture  for thunderstorm   development 4. Although the positive energy areas  exceed  the  negative energy areas, due to the intensity  of  the  low-level inversion, thunderstorms  would probably  not  form 3-16. When  the  parcel  method  for mechanical  lifting  is  used,  what level(s)  is/are  determined  on  the Skew T log P diagram? 1. LCL 2. LFC 3. Both 1 and 2 above 4.   LND 17