5. On the 500-mb map, the plotted report for Great Falls shows that, at the 500-
ID: 116933 • Letter: 5
Question
5. On the 500-mb map, the plotted report for Great Falls shows that, at the 500-mb pressure level over the station, the temperature was ________ °C.
[] –14
[] –15
[] –19
[] –21
6. The dewpoint at 500 mb over Great Falls was ________ °C.
[] –14
[] –15
[] –19
[] –21
7. The wind at Great Falls was generally from the northwest at about________ knots. [Note: When winds of 50 knots or greater are reported, a pennant is used on the station’s wind shaft for a 50-kt increment along with the appropriate number of long and short “feathers.”]
[] 15
[] 25
[] 35
[] 55
The following data were from rawinsonde reports from different stations along the 500-mb level on 12Z 24 OCT 2017 (note that temperature, dewpoint, and wind speed values were rounded when plotted on the map).
Table 1. 500 millibar rawinsonde observations of height, temperature, dewpoint, wind direction and speed from selected U.S. stations for 1200Z 24 OCT 2017. Numeric wind directions are noted as degrees clockwise from North (0/360) (e.g., South wind is 180°, West is 270°, etc.).
8. From Table 1, consider stations A, B, and C located on the 500-mb map: One station in western New York, another in north-central New Mexico, and yet another in eastern Wisconsin. Examining those stations’ data on the map identifies Station A in Table 1 to be ________, Station B to be ________, and Station C to be ________.
[ ] Albuquerque, NM; Green Bay, WI; Buffalo, NY
[ ] Buffalo, NY; Green Bay, WI; Albuquerque, NM
[ ] Albuquerque, NM; Buffalo, NY; Green Bay, WI
[ ] Green Bay, WI; Buffalo, NY; Albuquerque, NM
9. The station identified in Table 1 with the highest height and warmest temperature was ________.
[ ] Albuquerque, NM
[ ] Buffalo, NY
[ ] Green Bay, WI
The pattern of 500-mb heights (heights above sea level where the air pressure is 500 mb as found by radiosondes at that time) can be shown by contour lines on Figure 2. To better visualize the contour pattern on the Figure 2 map, highlight/annotate the blue 5760-m contour by tracing your finger (or pencil) over it. [The 5760-m contour has labels starting in coastal British Columbia (Canada). The adjacent 5700 m and 5820 m contours to its north and south are clearly shown in Texas and Oklahoma.]
10. The contour pattern of the 500-mb map has ________.
[ ] a deep trough from the Great Lakes to the Gulf of Mexico
[ ] an amplified ridge across the eastern two-thirds of the country
[ ] generally straight west-east flow across the central U.S.
11. Compare the surface (Figure 1) and 500 mb (Figure 2) wind speeds in a general west-east band across the middle of the country at the same locations at 12Z 24 OCT 2017. The wind speed comparison shows that as altitude in the atmosphere increases, wind speeds generally ________. This relationship results in part from the absence of friction in the middle and upper atmosphere.
[ ] decrease
[ ] remain the same
[ ] increase
12. The 500-mb map (Figure 2) also shows that, where contour lines are relatively close, such as across the U.S. Plains States, wind speeds are relatively ________ compared to where contour lines are more widely spaced. This principle corresponds to the similar relationship between the spacing of isobars and wind speeds on surface maps.
[ ] faster
[ ] slower
13. At upper levels, the wind directions are also related to the contours. That is, especially where winds are relatively fast, the winds are generally ________.
[ ] “parallel” to the contours
[ ] directed across the contours at large angles
The absence of friction at upper levels means that flow is controlled mainly by the pressure gradient and Coriolis forces. Therefore, winds generally flow along the contours on upper level maps as opposed to the inward circulations within Lows and outward within Highs seen on surface maps. Compare these 500-mb flows to those seen on the Figure 1 surface map.
14. Using the 500-mb station values from Table 1 as well as the contour pattern, compare the reported station heights at Albuquerque, in north-central New Mexico, Buffalo in western New York, and Green Bay in eastern Wisconsin. The 500-mb height was lowest over ________.
[ ] Albuquerque
[ ] Buffalo
[ ] Green Bay
15. Compare the temperatures for Stations A, B, and C in Table 1. As you recall from Investigation 5B, the relation of column temperatures to heights of pressure surfaces was examined using conceptual “pressure blocks.” The 500-mb temperature, reflective of the temperature of the column beneath that level, was lowest at ________.
[ ] Albuquerque
[ ] Buffalo
[ ] Green Bay
16. The station identified in item #15 ________ coincide with the lowest height of the three stations identified in Table 1 at 500 mb.
[ ] did
[ ] did not
17. Upper air features result from cooler temperatures in the air column between the surface and 500 mb. The lowest 500-mb heights are generally associated with ________ latitude stations. However, when there is a highly amplified wave pattern, as in Figure 2, that latitude correlation may not hold true. Nashville, TN, Green Bay, WI, and International Falls, MN are located along a similar north-south axis, but in Figure 2 Green Bay has the lower height at 500-mb of pressure, despite being located south (lower latitude) of International Falls.
[ ] higher
[ ] lower
ONLINE-CWS 8B - 4 -FL17 579 -13 56 549 -10 59 -25 21 -35 -25 9 598 578 -8/598-44 -, 597 -12 58 29 5880 -6, 595 -51 -61 594 -31 -25 5320 7 592 10- 8 587. 590 590 59 NCEP/NWS/NOAA ue ntours of Height h) - Isotherms Figure 2. - Analyzed NCEP weather map with height contours (isohypses), isotherms in & 500 mb rawinsonde data for 12Z 24 October 2017.Explanation / Answer
5. On the map, the for that, at the over the , the temperature was -15°C.
6. The dewpoint at 500 mb over was -19 °C.
7. The wind at was generally from the northwest at about 55 knots. [Note: When winds of 50 knots or er are ed, a pennant is used on the ’s wind shaft for a 50-kt increment along with the appropriate number of long and short “feathers.”]
8. From Table 1, consider s A, B, and C located on the map: One in western New York, another in north-central New Mexico, and yet another in eastern Wisconsin. Examining those s’ data on the map identifies A in Table 1 to be Albuquerque, NM , B to be Buffalo, NY , and C to be Green Bay, WI.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.