12th Symposium on Meteorological Observations and Instrumentation


A National Temperature Record at Loma, Montana

Andrew H. Horvitz, NOAA/NWS, Silver Spring, MD; and S. Stephens, M. Helfert, G. Goodge, K. T. Redmond, K. Pomeroy, and E. Kurdy

On January 14th-15th, 1972, a National Weather Service cooperative observer site located in Loma, Montana recorded a 103F temperature rise (-54F to 49F) within twenty-four hours, thereby breaking the previous national record of 100F fall set on January 23-24th, 1916 in Browning, Montana. The record is discussed at this time for the following two reasons. First, neither the NWS Forecast Office in Great Falls, MT. (WFO-GTF) nor the cooperative observer were aware a national record had occured. Secondly, until recent years, there was no official mechanism in place to determine the validity of the Loma record. The National Climate Extremes Committee, established by the NWS Office of Meteorology (Uccellini, Director) prior to the onset of the El Nino in 1997-98 and chaired by NOAA's National Climatic Data Center, was requested by the Great Falls, Montana office in April, 2002 to evaluate this event and recommend if a new national twenty-four hour record had been established. This paper will present the synoptic conditions which resulted in the extreme temperature rise, describe the siting, instrument, and observer standards at the site as well as discuss the evaluation process the National Climate Extremes Committee utilizes to determine a potential national record.

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Session 15, Surface Measurements
Thursday, 13 February 2003, 3:30 PM-4:30 PM

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