ATDTDCSAutomated Tone Dial Telephone Data Collection System - Data collection system where cooperative observers collect precipitation, stage, and temperature data then transmit the data to the NWS ATDTDCS computer through the telephone lines. The ATDTDCS computer transmits the data to AFOS. EXTDExtend/ExtendedLMTDlimitedLTDLimitedPTDYOn a buoy report, Pressure Tendency is the sign (plus or minus) and the amount of pressure change (hPa) for a three hour period ending at the time of observation.TDTropical DepressionTDATodayTDWRTerminal Doppler Weather Radar
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