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ALT The Big Melt has begun; 2023 spring flows into Lake Tahoe compared to the historical record. Nine timeseries plots show daily streamflow (cubic feet per second) from March 2023 to present, highlighted in green, compared to historical record, shown in grey that date back to 1975. Streamgraphs show the 2023 snowmelt runoff in the basin trending upwards across all stream gauges, aiming to surpass previous years dating back to 1975.
ALT A tile map of the US showing streamgages by flow levels through the month of January 2023. For each state, an area chart shows the proportion of streamgages in wet, normal, or dry conditions. Streamflow conditions are quantified using percentiles comparing the past month’s flow levels to the historic record for each streamgage. During the month of January, Winter storms Jimenez and Kassandra brought wetter than normal conditions for much of the U.S. Concurrently, California saw wetter than normal conditions when a series of atmospheric rivers brought snow and rain. At the national scale, many sites experienced wetter than normal conditions as winter storms conditions persisted across much of the U.S., with a series of atmospheric rivers on the west coast.
ALT A targets flow diagram with many green circles and triangles on the left leading to fewer and fewer green circles and triangles in the middle to even fewer light blue squares and circles on the right.
ALT A photo of a river running through the trees. The text says “Join the party! Stories of the water cycle. Swipe to see the panelists.”
ALT A preview image of the new water cycle diagram, which is faded out in the background. The text says “Join the party. Stories of the Water Cycle. October 13, 2022. 6:30 pm ET/3:30 pm PT #WaterCycleStories” The USGS logo is in the top left corner.
ALT We are hiring (soon): supervisory team leads (GS-13). There will be 2 positions with the Data Science Branch. Each will be responsible for 2 of the following specializations: machine learning, web analytics, data visualization, and/or reproducible data assembly. In the Web Communications Branch there will be 2 positions with the product management & communications and software teams.
ALT Earlier peak surface temperatures in 5,875 out of 7,143 Midwest lakes when comparing the change between the average day of predicted peak surface temperature from 1980-1989 and the average from 2009-2018. A map of the Midwest uses a color scale to mark each lake’s average summer temperature from 15 degrees Celsius to 35 degrees Celsius. A chart on the side ranges from –20 days to 10 days to show whether the peak is earlier, later, or has no change. These charts indicate that southern midwest lakes in IL, IN, and IA have a higher average summer temperature, and the timing of peak surface temperatures has not changed consistently. The majority of northern lakes in MN, WI and MI are colder and going N to S the timing of peak surface temperatures is getting earlier.
ALT A chart compares basic access to safe drinking water in urban and rural areas around the world. Access, measured as the percent of the population meeting basic drinking water requirements, is shown for 155 countries. Urban areas tend to have higher access to drinking water compared to rural areas. Globally, approximately 95% of urban populations have basic drinking water access compared to around 0% of rural populations. In some countries, as low as 15% of rural populations have access to drinking water, while all urban areas have at least 50% access. The data come from OWID water, sanitation, and hygiene data explorer, WHO/UNICEF Joint Monitoring Program for Water Supply and Sanitation.
ALT The rise and fall of the Delaware River salt front. Over time, the location of the salt front moves in response to regional weather patterns, sea level rise, and human impacts. The precise location of the salt front in the Delaware River Basin is based on the location in the river where the average chloride concentration is 250 mg/L. Two polar charts show the location of the salt front along the Delaware River in 2016 and 2019. When there is lots of precipitation, as was the case in early 2019, increased flow in the Delaware River pushes the salt front downstream. When conditions are very dry, as was the case in fall 2016, the salt front gradually moves further and further upstream, passing Wilmington, Delaware, and nearing Philadelphia, Pennsylvania. During both years, the salt front is highest upstream, encroaching Philadelphia, during the months of September, October, and November, while located further downstream below Wilmington from Jan – June.
ALT A time series of streamflow drought events occurring across 122 stream gages in the Upper Colorado River basin from 1980 to present. Periods of streamflow drought are indicated for each of 122 gages in a beeswarm-like chart, with time on the x-axis. During time periods where many gages experienced drought, the swarm bulges due to many co-occurring events. Widespread drought events appear in 1982, 2002-2003, 2012-2013, and 2018. It appears that larger drought events are more common in the recent past, and that drought duration is generally increasing over time. The largest period of simultaneous drought across gages occurred in 2002. Across gages, the Recapture Creek sites near Blanding, UT has had some of the longest drought events, with 266 and 354 days of drought starting in 2002 and 2018, respectively.
ALT A map of USGS streamgages and population density shows the proximity of gages to people. In addition, a line chart is overlaid showing the total population within 3 distances from any gage in the US. These distances represent a normal walking distance, biking distance, and driving distance. 6,731,533 people are within walking (< 2km), 106,186,269 within biking (< 6 km) and 299,932,698 within driving (<20km)