1 / 9

Hazards Assessment Issued December 28, 2009

January 3-7, 2008 West Coast Rain/Snow Event. 00Z 5 January, 2008. Snowfall in CA mountains of up to 10 feet. Many locations with multiple feet of snow. Localized flooding caused by heavy rains at lower elevations Rainfall amounts 2-10 inches. 3 Weeks Prior to Event.

amity
Download Presentation

Hazards Assessment Issued December 28, 2009

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. January 3-7, 2008 West Coast Rain/Snow Event 00Z 5 January, 2008 • Snowfall in CA mountains of up to 10 feet. • Many locations with multiple feet of snow. • Localized flooding caused by heavy rains at lower elevations • Rainfall amounts 2-10 inches. 3 Weeks Prior to Event 6 Days Prior to Event Hazards Assessment Issued December 28, 2009 MJO Update: issued by Climate Prediction Center December 24, 2007 “Some potential exists for a heavy precipitation event tied to tropical convection by week 3 … along the west coast of the US”

  2. 4-5 Day Forecast Verifying Analysis 48-h QPE ending 00Z 6 Jan x 8.78 HPC 48-h QPF ending 00Z 6 JanIssued 00Z 1 JanDay 4-5 Forecast

  3. 4-5 Day Forecast Proposed Action: 9:00 am January 1, 2008 HPC medium range desk (Day 4-7) provides “heads up” to FEMA national HQ of possible extraordinary weather event (very large snowfall/blizzard or rains leading to significant river flooding) Provided only for hazards impacting several states/multiple WFOs/RFCs Event description with attached graphic depiction of hazard including links to NCEP and WFO/RFC products sent via email Followed by telecon or VTC, at FEMA request only 9:00 am January 2 and 3, 2008 Similar contact as forecaster confidence of widespread extraordinary weather event increases Verifying Analysis 48-h QPE ending 00Z 6 Jan x 8.78 HPC 48-h QPF ending 00Z 6 JanIssued 00Z January 1, 2008Day 4-5 Forecast

  4. 1-3 Day Forecast Verifying Analysis 72-h QPE ending 00Z 7 Jan x 10.24 HPC 72-h QPF ending 00Z 7 JanIssued 00Z January 4, 2008Day 1-3 forecast

  5. 1-3 Day Forecast Verifying Analysis 72-h QPE ending 00Z 7 Jan x 10.24 Proposed Action: 9:00 am January 4, 2008 HPC Winter Weather Desk initiates contact to FEMA on a major winter storm. [Possible daily telecon/ VTC on large events (not daily briefings through the winter)] HPC 72-h QPF ending 00Z 7 JanIssued 00Z January 4, 2008Day 1-3 forecast

  6. 3 Day Total Snowfall Forecast 00Z Jan 4 – 00Z Jan 7 Verifying Analysis HPC 72-h PRISM adjusted snow accumulation forecast ending 00Z 7 JanIssued 00Z January 4, 2008 HPC analysis of storm-total snowfall (in.) 3–7 Jan

  7. 3 Day Total Snowfall Forecast 00Z Jan 4 – 00Z Jan 7 Verifying Analysis Proposed Action: 9:00 am January 4,5,6, 2008 HPC provides support to FEMA via information on changes to storm track and intensity (i.e., impacts) via phone or VTC and summary of existing watches/warnings [as preferred by FEMA]. HPC 72-h PRISM adjusted snow accumulation forecast ending 00Z 7 JanIssued 00Z January 4, 2008 HPC analysis of storm-total snowfall (in.) 3–7 Jan

  8. 1 Day Forecast Verifying Analysis 24 h QPE ending 00Z 6 Jan HPC 24-h QPF ending 00Z 6 Jan Issued 00Z January 5, 2008 Day 1 Forecast

  9. January 3-7, 2008 West Coast Rain/Snow Event 00Z 5 January, 2008 Storm-total snowfall (in.) 3–7 Jan

More Related