Image 1 is the surface weather map for 00Z 17 APR 2017. At map time, one elongat
ID: 110383 • Letter: I
Question
Image 1 is the surface weather map for 00Z 17 APR 2017. At map time, one elongated frontal boundary stretched from Maine generally southwestward to Arizona being mostly a cold front until becoming stationary over the Southwest. A low-pressure system with a cold and stationary fronts was located along the northern tier of states from upper Michigan to Montana. A third occluded system with an occluded, a warm, and a cold front was reaching the California coast.
1. Note the temperature and dewpoint in the station model at Midland, in west-central Texas. Midland’s temperature at map time was 76 °F (somewhat obscured) and the dewpoint was ________ °F. Midland was just southeast of the nearby stationary front in west TX.
[ ] 68 [ ] 62 [ ] 57
2. Atmospheric conditions at El Paso, in extreme western TX, were representative of those behind a dry line (a line of orange, open semicircles in that region). The temperature and dewpoint at El Paso were 86 °F (also somewhat obscured) and ________ °F, respectively.
[ ] 41 [ ] 28 [ ] 10
3. The dewpoint at Midland indicated air with relatively ________ concentrations of water vapor preceding the dry line and southeast of the stationary front as compared to El Paso. (A guide is that an increase of 18 F° in dewpoint indicates about a doubling of water vapor CWS 11A - 2 concentration in the air.) Recall that drier air is more dense than humid air at comparable temperatures and pressures.
[ ] high [ ] low
4. Wind at Midland was generally from the ________ at about 10 knots.
[ ] north-northeast [ ] west-southwest [ ] south-southeast [ ] east-northeast
5. The wind direction at Midland showed air ________ approaching the frontal boundary. Also, the land near Midland is on a sharply rising north-south oriented plateau to the west along central Texas providing orographic lifting of westward-flowing air.
[ ] was [ ] was not
6. Based on your response to Item 5, winds near the surface near Midland ________ be bringing humid air toward boundaries producing lift (the frontal surface and plateau).
[ ] would [ ] would not
7. Radar reflectivity shadings of red splotches showed that some precipitation intensities associated with the precipitation area across western Texas were relatively ________.
[ ] weak [ ] strong
8. Such relatively small areas of those precipitation values would likely be associated with ________.
[ ] widespread light rainfall [ ] local strong thunderstorms
9. The partially obscured Midland station model reported the present weather condition to be . This indicated that ________ was/were in the area.
O0Z 17 APR 2017 Isobars, Fronts. Radar &Data; Fronts at 00Z 1016 1008 1029 0 004 1003 55 9620 24531014 197 1009 91 5 1002 2 36 69 15 1006 169 432 1019 1020 492 17 1012 63 1021 57 59 10163 1 2141 OUTFLOW BNDRYBNDRY 63 1006 OUTFLOW 203.69 727 53 20 1008 1024 1006 21 74 022 78 19 1005Explanation / Answer
1. 62: dewpoint of midland
2.41: dewpoint if elpaso
3.high: water vapour content
4. North - northeast: direction of wind at midland
5.was
6. Would