Chapter 13 Current Weather Studies

The change of temperature in the one-hour period between 15Z and 16Z was approximately ________ Fahrenheit degrees.

20

Between 14Z of the 4th and 00Z on the 5th, the dewpoint had decreased about ________ degrees.

38

Begin at the NWS Office's local forecast page. Click on a location marked by a (♦) in the mapped area. While the graphical depictions of the forecast extend out several days, the text forecasts extend out for most of ________ days into the future.

7

The upper map on the left is the National Forecast Chart for the current day's weather, showing positions of centers of Highs and Lows, fronts, and probable precipitation. Below the map, click on "Animated Forecast Maps" to see predicted positions of weather systems and features. Using the control bar to animate the map while keeping track of the information in the lower left of the map, it can be determined that forecast maps are presented out ________ days (listed as "Valid" date).

7

At 14Z on the 4th, the pressure was about ________ mb.

999

The air pressure in millibars is shown in the bottom graph panel of the meteogram. From 01Z on April 4th to 14Z on the 4th, the air pressure at Washington was generally ________. During this period a storm system with its trailing cold front was approaching Washington.

falling

During the one hour, from 15Z to 16Z, the temperature ________.

fell rapidly

Go back to the U.S. map. According to the U.S. map legend, any counties on the map colored green are currently under a ________.

flood-related alert

Scroll down the forecast page and click on the "Hourly Weather Forecast" graph. The graph that appears depicts predicted weather out two days (and can be extended twice in two-day steps). The top panel reports the temperature and dewpoint. The third panel from the top includes relative humidities in dark green. Comparisons of these values confirm that the closer the temperature and dewpoint values at the same time of observation, the ________ the relative humidity.

higher

From 16Z on the 4th to 00Z on the 5th, winds were generally from the ________. The shift in wind direction sometime during the hour after 15Z was dramatic.

northwest

In the third panel from the top in the meteogram, at 11Z and 14Z on the 4th, the weather symbols (dots) indicated ________ occurred at Washington.

rain

From 14Z until 00Z on April 5th, the air pressure generally ________. The total pressure change from 14Z to 00Z on the 5th (10 hours) was greater than the total downward change over the 13 hours prior to 14Z on the 4th, making change following 14Z more rapid compared to the previous several hours of the meteogram.

rose

The top panel of the meteogram shows temperatures (red) and dewpoints (green). From 10Z to 15Z, the temperatures ________.

rose

The second panel from the top in the meteogram displays sky cover and winds. From 04Z to 15Z on the 4th, the winds were generally from the ________.

south