SCAN Homework #4 Answers

1. Aviation routine Weather report for KSBN recorded on the 24th at 2054Z, wind 100° at 7kts, visibility 7sm, light thunderstorms and rain, few clouds at 4,400ft., overcast at 8,500ft., temp 19°C, dewpoint 18°C, altimeter 29.96", Remarks: Automated station with precipitation descriminator, thunderstorms began 31 minutes after the hour, rain began 00 minutes after the hour, pressure falling rapidly, sea level pressure 1090.4mb, frequent lightning (1-6 flashes per minute) In Cloud, Cloud to Cloud, and Cloud to Air, Southwest to Northwest within 5nm of the field and Southwest to Northwest moving Northeast, 0.06 inches of rain in last hour, 0.06 inches of rain in last 6 hours, temperature 19.4°C, dewpoint 17.8°C, 3-hour pressure tendancy: decreasing then decreasing rapidly by 05.6hp. 2. The Thunderstorm moved overhead reducing visibility to 1 1/2sm, increasing winds to 28kts gusting to 50kts and a squall. 3. Radar summary for IND recorded at 2135Z. Area of echoes covering 2/10ths of the area consisting of thunderstorms and snow showers of extreme intensity, centered on a line from the IND 017° radial at 87nm to the IND 212° radial at 102nm which is 83nm wide. Maximum top of precipitation is 41,000ft MSL located at the IND 006° radial at 111nm. The cell is moving from 210° at 37kts. 4. From the KDTW TAF: - visibility greater than 6sm, scattered clouds at 2,500ft, overcast at 4,000ft - temporarily (for less than 1 hour for less than 1/2 the time period) from 2100Z to 0400Z variable wind at 35kts gusting to 50kts, 1sm visibility in heavy thunderstorms and rain, overcast 1,000ft cumulonimbus clouds. 5. From the FA (area forecast): - VFR conditions can be expected (visibility > 5sm, ceiling > 3,000ft) - Wind in excess of 20kts either sustained or gusty 6. Using the information from AIRMET Zulu, you can expect to encouter icing at around 10,000ft MSL 7. GS = 9kts 8. FWA UA/OV FWA/TM 2300/FL 075/TPD328/WX+SN/TB INTRMTLGT (NOTE: this PIREP can be made several different ways, this is simply one example) 9. There are two reporting stations in NW NM: - scattered clouds, temp 41°C, dewpoint 37°C, wind NE at 5kts - scattered clouds, temp 43°C, dewpoint 30°C, Sea level pressure 1010.1mb, steadily increasing by .3mb in last 3 hours 10. Cell is moving east at 25kts, light to moderate snow showers increasing in intensity with highest precipitation at 20,000ft MSL 11. Severe Thunderstorm watch number 036 12. The top two charts show forecast significant WX for 12 and 24 hours including IFR, MVFR, turbulence and icing. The bottom two charts show forecast surface conditions for 12 and 24 hours. 13. (Use the Southern Section of GA): - The cause is Tropical Storm Jerry - The WX in Georgia will include a Tropical Storm with thunderstorms and rain showers, moderate to severe turbulence up to 24,000ft. 14. 260° at 50kts. Temp -41°C
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