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Last modified
8/16/2009 2:43:21 PM
Creation date
2/16/2007 12:15:13 PM
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Board Meetings
Board Meeting Date
9/20/2006
Description
IWM & D Section - Western Governors Association - The National Integrated Drought Information System - Creating a Drought Early Warning System for the 21st Century
Board Meetings - Doc Type
Memo
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<br /> <br /> <br />It will require a network of scientists to maintain the physical observing system, <br />collect and analyze the data, and to collect and synthesize the infonnation on <br />drought impacts. These and related observations must meet data quality standards <br />for siting, performance and maintenance. <br />The necessary physical information includes observations of precipitation, soil <br />moisture, snow water content and snow depth, soil and air temperatures, humidity, <br />wind speed and direction, and solar radiation. Currently, the placement of soil tem- <br />perature and soil moisture measurements is too sparse, and nonexistent in many <br />areas, for effective use. <br />Drought revolves around the supply of and the demand for water. Integrating <br />data on stream now, lake and reservoir levels, and ground water status also is <br />required for NIDIS. With our increasing dependence on ground water, a cooperative <br />system of ground water monitoring wells is essential. <br />The greatest current data shortfalls are on the local (city/county) and state lev- <br />els. Physical infonnation and drought impact information at these levels is almost <br />impossible to obtain in a uniform manner across the nation. The National Weather <br />Service (NWS) has proposed in its mooernization of the Cooperative Observer <br />Network a minimum spatial density of one observing site for each 400 square miles <br />across the country, or in other words, sites would be about 15 to 20 miles apart. <br />Other placement strategies, such as using hydrologic units, may need to be <br />employed to optimize spatial coverage. <br />Drought infonnation needs also ditTer greatly by region. In the West, for exam- <br />ple, mountain snow pack is a critical component of waler supply. It is thus essential <br />to generate and distribute the best estimates possible of the water content of snow <br />on the ground, snowmelt, and snow-to-vapor sublimation. <br /> <br />. <br /> <br />. <br /> <br />Transmitting Climate Data <br /> <br />Weather and climate observations have limited value if they cannot become part <br />of a larger drought risk mosaic. A wide variety of data networks currently exist <br />throughout the U.S. Many of these networks transmit their observations with <br />telecommunications that balance frequency and reliability with operation and main- <br />tenance costs. A large number of hydroclimatic observations, including the USGS <br />streamflow network, are transmitted in near real-time by satellites (GOES). In the <br />mountainous West, where data transmissions are often blocked by mountains, <br />the meteor-burst technology used by the NRCS SNOTEL {SNOw TELemetryl net- <br />work provides a reliable and cost-effective real-time data transmission method. <br />In areas where terrain is not a constraint to data transmission, innovative <br />partnerships have been established to "piggy-back" climate data over existing <br />data networks. <br />In Oklahoma. the Oklahoma Climatological Survey (QCS) has a partnership <br />with the Oklahoma Law Enforcement Telecommunications System (OLETS) <br />allowing the transmission of its Mesonet data through police, fire and emergency <br />management offices throughout the state. This high quality, land-line network <br />eliminates the need for QCS to deploy and maintain an independent communica- <br />tions network solely for Mesonet data. The bandwidth required to transmit all <br />Mesonet observations and communications represents only a vcry small fraction of <br />thc total OLETS capacity. The cooperative arrangement represents a savings of . <br />over one million dollars annually for Mesonet operations. This model could be <br />replicated in other states, working with the National Enforcement <br />Telecommunications System (NLETS). <br />
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