Question

The forecasts are issued on Monday, March 21, at 1200z, which...The forecasts are issued on Monday, March 21, at 1200z, which corresponds to what local, Central Daylight Time (CDT)?Complete Table 11-1 by filling in the blanks indicating local time.Why is it appropriate in this example to report the predicted daily minimum and maximum temperatures (the row labeled N/X) at 1200z and 0000z respectively?Output variables are closely related to one another. Why do you think that the NAM model predicts higher temperatures than the GFS model in the first nine hours after the forecast is issued?Each row in the tables indicates a different variable. Can you decode their abbreviations?DT ________________HR(z) ________________N/X ________________TMP ________________DPT ________________CLD ________________WDR ________________WSP ________________

Answer 1

The local time corresponding to 1200z in Central Daylight Time (CDT) can vary depending on the time zone. The predicted daily minimum temperature (row labeled N) is reported at 1200z, while the predicted daily maximum temperature (row labeled X) is reported at 0000z. The NAM and GFS models may predict different temperatures due to differences in their algorithms, data sources, and initialization processes.

Step-by-step explanation:

The local time corresponding to 1200z in Central Daylight Time (CDT) can vary depending on the time zone. To determine the local time, you need to know the time offset of the specific location from the UTC time zone. For example, if the location is in the Central Time Zone of the United States, which is UTC-6, then 1200z would correspond to 6:00 AM CDT.

The predicted daily minimum temperature (row labeled N) is reported at 1200z because it corresponds to the coldest part of the day, which is typically around sunrise. On the other hand, the predicted daily maximum temperature (row labeled X) is reported at 0000z because it corresponds to the warmest part of the day, which is typically around mid-afternoon.

The NAM (North American Mesoscale Model) and GFS (Global Forecast System) models use different algorithms and data sources to make their temperature predictions. The NAM model may predict higher temperatures than the GFS model in the first nine hours after the forecast is issued due to differences in their initialization processes, model physics, and resolution.

Here are the abbreviations related to the output variables in the table:

• DT: Date and time
• HR(z): Hour in UTC time
• N/X: Predicted daily minimum/maximum temperatures
• TMP: Temperature
• DPT: Dew point temperature
• CLD: Cloud cover
• WDR: Wind direction
• WSP: Wind speed