Topographic Dependency of Rainfall Characteristics from the Sierra Madre Occidental in Northwest Mexico NERN Project Team: NCAR, U. Arizona, U. Sonora,

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Presentation transcript:

Topographic Dependency of Rainfall Characteristics from the Sierra Madre Occidental in Northwest Mexico NERN Project Team: NCAR, U. Arizona, U. Sonora, IMADES, ITSON, NOAA-CPC, Hampton U. 29 th Annual Climate Diagnostics and Prediction Workshop October 20, 2004

Outline of Presentation: Brief overview of the precipitation event monitoring network in Mexico for the 2004 NAME-EOP Recent findings from the NERN with emphasis on the diurnal cycle Complimentary activities

NEXRAD Yuma NCAR SPOL SMN Guasabe SMN El Palmito SMN Cd. Obregon SMN Los Cabos NEXRAD Tucson NEXRAD El Paso Radar Umbrella Radius: Approx. 150 km NEXRAD San Angelo NEXRAD Midland

NERN-Spol Radar Network:

NAME Simple Rain Gauge Network 141 Gauges Daily Reporting

NERN Configuration: 87 Event logging, tipping bucket raingages 6 major W-E transects traversing SMO Major improvement in topographic and temporal sampling of precipitation Installed , in operation through spring of 2006 Not available in real-time Contacts:

NAME Physiographic Relationships

Precipitation Analyses: Diurnal Cycle of Precipitation Frequency

Precipitation Analyses: Diurnal Cycle of Precip. Frequency Jul-Aug ’03 Transect Mean Diurnal Cycle

Precipitation Analyses: Diurnal Cycle of Intensity

Precipitation Analyses: Extreme Precipitation, Maximum Hourly Intensity Popular theme: Jones et al. Extreme precip and MJO Popular theme: Jones et al. Extreme precip and MJO Saha CFS extreme precip validation Saha CFS extreme precip validation Kunkel Extreme precip Kunkel Extreme precip What is an extreme? S. Saha “Large departure from What is an extreme? S. Saha “Large departure from normal” (>= 2 , 1.5  ) normal” (>= 2 , 1.5  )

Precipitation Analyses: Extreme Precipitation, Maximum Hourly Intensity Jul-Aug Elevation BandsNetworkB1B2B3B4B5B6 Elevation Band Interval (m) Number of Gages Avg. Max. Intensity Std. Dev. Max. Intensity Abs. Max. Intensity

1-Day5-Min

Gulf Surges During 2003 – NERN Analysis

CPC-NERN Jul-Aug 03 Total Precipitation CPC-NERN Aug 02 Total Precipitation Quantifying Uncertainty in QPE Products Difference in monthly and seasonal precipitation in CPC daily gridded analyses and NERN Appear to be regions of persistently high uncertainty Useful a value-analysis of NERN gauges in formation of a long-term observing network

Complimentary Activities: Isotopic Analysis Evaporation of falling rain appears to be significant only in the desert climate of the three northwestern stations (Tucson, Mazocahui and Huasabas). Trend in  O18 values from northwest to southeast is mainly a function of station altitude. The samples generally plot close to the Global Meteoric Water Line (GMWL) but do show evidence of some interannual variability (Courtesy of Chris Estoe, U. Arizona) GMWL: dD=8.13*d18O+10.8 NERN-03: dD=5.97*d18O-5.65

NAME Community Archives Hydrological Data (NHWG-Action Plan) –Daily Reports from the CNA from Sonora (and Sinaloa) –Streamflow, reservoir levels, precipitation, pan evaporation –Currently in Excel Spreadsheets –Will be distributed via JOSS NAME Data Catalog WRF Modeling Archive –Jul 1 – Sep 1, 2004 –2x Daily 48-hr Forecasts –GFS Initialization and Boundary Forcing –12 km horizontal resolution, 31 vertical layers –Available to community via NCAR Mass Store (1.22 Gb) Photo Archive –UCAR Digital Image Library ( –NOAA Photo Library (

Precipitation Analyses: Topographic Dependence of the Diurnal Cycle of Wet Day Rain Rate