Search Results - "Ralph, F. M."

Impact of interannual variations in sources of insoluble aerosol species on orographic precipitation over California's central Sierra Nevada by Creamean, J M, Ault, A P, White, A B, Neiman, P J, Ralph, F M, Minnis, P, Prather, K A

“…Aerosols that serve as cloud condensation nuclei (CCN) and ice nuclei (IN) have the potential to profoundly influence precipitation processes. Furthermore,…”
Get full text

CALWATER FIELD STUDIES DESIGNED TO QUANTIFY THE ROLES OF ATMOSPHERIC RIVERS AND AEROSOLS IN MODULATING U.S. WEST COAST PRECIPITATION IN A CHANGING CLIMATE by Ralph, F. M., Prather, K. A., Cayan, D., Spackman, J. R., DeMott, P., Dettinger, M., Fairall, C., Leung, R., Rosenfeld, D., Rutledge, S., Waliser, D., White, A. B., Cordeira, J., Martin, A., Helly, J., Intrieri, J.

“…The variability of precipitation and water supply along the U.S. West Coast creates major challenges to the region’s economy and environment, as evidenced by…”
Get full text

Characterizing drought in California: new drought indices and scenario-testing in support of resource management by Flint, Lorraine E., Flint, Alan L., Mendoza, John, Kalansky, Julie, Ralph, F. M.

“…Introduction California’s recent drought (2012–2016) has implications throughout the state for natural resource management and adaptation planning and has…”
Get full text

Observations of an Extreme Atmospheric River Storm With a Diverse Sensor Network by Hatchett, B. J., Cao, Q., Dawson, P. B., Ellis, C. J., Hecht, C. W., Kawzenuk, B., Lancaster, J. T., Osborne, T. C., Wilson, A. M., Anderson, M. L., Dettinger, M. D., Kalansky, J. F., Kaplan, M. L., Lettenmaier, D. P., Oakley, N. S., Ralph, F. M., Reynolds, D. W., White, A. B., Sierks, M., Sumargo, E.

“…Observational networks enhance real‐time situational awareness for emergency and water resource management during extreme weather events. We present examples…”
Get full text

Hourly storm characteristics along the U.S. West Coast: Role of atmospheric rivers in extreme precipitation by Lamjiri, M. A., Dettinger, M. D., Ralph, F. M., Guan, Bin

“…Gridded hourly precipitation observations over the conterminous U.S., from 1948 to 2002, are analyzed to determine climatological characteristics of storm…”
Get full text

Improving Atmospheric River Forecasts With Machine Learning by Chapman, W. E., Subramanian, A. C., Delle Monache, L., Xie, S. P., Ralph, F. M.

“…This study tests the utility of convolutional neural networks as a postprocessing framework for improving the National Center for Environmental Prediction's…”
Get full text

Historical and National Perspectives on Extreme West Coast Precipitation Associated with Atmospheric Rivers during December 2010 by Ralph, F. M., Dettinger, M. D.

“…A common denominator among these events is that the synoptic weather patterns produced a series of strong atmospheric rivers (AR) that transported large…”
Get full text

Observed Impacts of Duration and Seasonality of Atmospheric-River Landfalls on Soil Moisture and Runoff in Coastal Northern California by Ralph, F. M., Coleman, T., Neiman, P. J., Zamora, R. J., Dettinger, M. D.

“…This study is motivated by diverse needs for better forecasts of extreme precipitation and floods. It is enabled by unique hourly observations collected over…”
Get full text

Characteristics, Origins, and Impacts of Summertime Extreme Precipitation in the Lake Mead Watershed by Sierks, Michael D., Kalansky, Julie, Cannon, Forest, Ralph, F. M.

“…The North American monsoon (NAM) is the main driver of summertime climate variability in the U.S. Southwest. Previous studies of the NAM have primarily focused…”
Get full text

Genesis, Pathways, and Terminations of Intense Global Water Vapor Transport in Association with Large‐Scale Climate Patterns by Sellars, S. L., Kawzenuk, B., Nguyen, P., Ralph, F. M., Sorooshian, S.

“…The CONNected objECT (CONNECT) algorithm is applied to global Integrated Water Vapor Transport data from the NASA's Modern‐Era Retrospective Analysis for…”
Get full text

Dropsonde Observations of Total Integrated Water Vapor Transport within North Pacific Atmospheric Rivers by Ralph, F. M., Iacobellis, S. F., Neiman, P. J., Cordeira, J. M., Spackman, J. R., Waliser, D. E., Wick, G. A., White, A. B., Fairall, C.

“…Aircraft dropsonde observations provide the most comprehensive measurements to date of horizontal water vapor transport in atmospheric rivers (ARs). The…”
Get full text

Increases in Future AR Count and Size: Overview of the ARTMIP Tier 2 CMIP5/6 Experiment by O’Brien, T. A., Wehner, M. F., Payne, A. E., Shields, C. A., Rutz, J. J., Leung, L.‐R., Ralph, F. M., Collow, A., Gorodetskaya, I., Guan, B., Lora, J. M., McClenny, E., Nardi, K. M., Ramos, A. M., Tomé, R., Sarangi, C., Shearer, E. J., Ullrich, P. A., Zarzycki, C., Loring, B., Huang, H., Inda‐Díaz, H. A., Rhoades, A. M., Zhou, Y.

“…The Atmospheric River (AR) Tracking Method Intercomparison Project (ARTMIP) is a community effort to systematically assess how the uncertainties from AR…”
Get full text

An Overview of ARTMIP’s Tier 2 Reanalysis Intercomparison: Uncertainty in the Detection of Atmospheric Rivers and their Associated Precipitation by Collow, A. B. Marquardt, Shields, C. A., Guan, B., Kim, S., Lora, J. M., Nardi, K., Payne, A., Reid, K., Shearer, E. J., Tomé, R., Wille, J. D., Ramos, A. M., Gorodetskaya, I. V., Leung, L. R., O’Brien, T. A., Ralph, F. M., Rutz, J., Ullrich, P. A., Wehner, M.

“…Atmospheric rivers, or long but narrow regions of enhanced water vapor transport, are an important component of the hydrologic cycle as they are responsible…”
Get full text

Influence of Dust on Precipitation During Landfalling Atmospheric Rivers in an Idealized Framework by Mascioli, N. R., Evan, A. T., Ralph, F. M.

“…Atmospheric rivers (ARs) can provide as much as 50% of the total annual rainfall to the United States West Coast via orographic precipitation. Dust is thought…”
Get full text

Multi‐GNSS Airborne Radio Occultation Observations as a Complement to Dropsondes in Atmospheric River Reconnaissance by Haase, J. S., Murphy, M. J., Cao, B., Ralph, F. M., Zheng, M., Delle Monache, L.

“…Variations in the water vapor that atmospheric rivers (ARs) carry toward North America within Pacific storms strongly modulates the spatiotemporal distribution…”
Get full text

Assessment of Extreme Quantitative Precipitation Forecasts and Development of Regional Extreme Event Thresholds Using Data from HMT-2006 and COOP Observers by Ralph, F. M., Sukovich, E., Reynolds, D., Dettinger, M., Weagle, S., Clark, W., Neiman, P. J.

“…Extreme precipitation events, and the quantitative precipitation forecasts (QPFs) associated with them, are examined. The study uses data from the…”
Get full text

Using Spectral Moment Data from NOAA's 404-MHz Radar Wind Profilers to Observe Precipitation by Ralph, F. M., Neiman, P. J., van de Kamp, D. W., Law, D. C.

“…A brief description is given of NOAA's 404-MHz Wind Profiler Demonstration Network (WPDN), including the radar configuration, sampling strategy, site locations…”
Get full text

A Vision for Future Observations for Western U.S. Extreme Precipitation and Flooding by Ralph, F.M., Dettinger, M., White, A., Reynolds, D., Cayan, D., Schneider, T., Cifelli, R., Redmond, K., Anderson, M., Gherke, F., Jones, J., Mahoney, K., Johnson, L., Gutman, S., Chandrasekar, V., Lundquist, J., Molotch, N., Brekke, L., Pulwarty, R., Horel, J., Schick, L., Edman, A., Mote, P., Abatzoglou, J., Pierce, R., Wick, G.

“…Recent and historical events illustrate the vulnerabilities of the U.S. west to extremes in precipitation that result from a range of meteorological phenomena…”
Get full text

Coastally Trapped Wind Reversals: Progress toward Understanding by Nuss, Wendell A., Bane, John M., Thompson, William T., Holt, Teddy, Dorman, Clive E., Ralph, F. Martin, Rotunno, Richard, Klemp, Joseph B., Skamarock, William C., Samelson, Roger M., Rogerson, Audrey M., Reason, Chris, Jackson, Peter

“…Coastally trapped wind reversals along the U.S. west coast, which are often accompanied by a northward surge of fog or stratus, are an important warm-season…”
Get full text

Representation of Dropsonde‐Observed Atmospheric River Conditions in Reanalyses by Cobb, A., Delle Monache, L., Cannon, F., Ralph, F. M.

“…Atmospheric rivers (ARs) are the primary mechanism for mid‐latitude water vapor transport, and are identified by a key variable, integrated water vapor…”
Get full text