Western U.S. Anomaly Page

The rankings shown on this page are based on the original methodology set forth by Hart and Grumm in their 2001 Monthly Weather Review article "Using normalized climatological anomalies to objectively rank extreme synoptic-scale events". The events listed and documented in this page represent anomalies across the western U.S. and the adjacent coastal waters. Special thanks go to Rich Grumm for all of his efforts regarding the operational use of tropospheric anomalies! Page maintained by Randy Graham.

Reference Material	Forecast Information	M Value Info	Case Studies and Presentations
Study Domain	Forecast Anomalies - Western U.S.Domain	Top 20 MTotal	Investigating Specific Event Types in the Western U.S Utilizing Standardized Anomalies - AMS WAF Poster 2007 - Graham and Grumm
Utilizing Normalized Anomalies to Assess Synoptic Scale Weather Events in the Western United States - Graham and Grumm early online-release	Anomaly Situational Awareness Table - Western U.S. NW Domain SW Domain SC Domain SE Domain NC Domain NE Domain Alaska Domain	Top 10 MHeight	Utilizing Standardized Anomalies to Assess Synoptic Scale Weather Events in the Western U.S - AMS WAF Presentation 2007 - Graham and Grumm
2007 AMS WAF Pre-print	Return Intervals - Western U.S.	Top 10 MTemp	Sierra Slam: The Historic 1952 Blizzard in the Sierra-Nevada Mountains - Chris Smallcomb
Utilizing Normalized Climatological Anomalies to Rank Synoptic-Scale Events Objectively - Hart and Grumm (the original work!)	Archived Anomaly Forecasts (internal NWS use only: Anomaly Looper Situational Awareness Tables	Top 10 MWind	Case study of the January 2008 Western U.S. Winter Storm - Presentation from the 2008 NWA Annual Meeting - Graham, Grumm, and Smallcomb
Eastern U.S. Anomaly Page - Hart and Grumm	HPC Anomaly Page	Top 10 MShum	NWA EJOM 2009-EJ9 - Analysis of the Western U.S. Winter Storm 3-7 January 2008: Part 1 - Correlating Normalized Anomalies with High Impact Weather and Event Rarity - Graham, Smallcomb, and Grumm
	PSU Ensemble/Anomaly Page	Top MTOTALS by Month	NWA EJOM 2009-EJ10 - Analysis of the Western U.S. Winter Storm 3-7 January 2008- Part II - a Forecasting Perspective using Ensemble Datasets - Smallcomb and Graham

Hart, R. and R.H. Grumm, 2001: Using normalized climatological anomalies to objectively rank extreme synoptic-scale events. Mon. Wea. Rev., 129, 2426-2442.