ATM 401/501 Status of Forecasting: Spring 2013
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Transcript of ATM 401/501 Status of Forecasting: Spring 2013
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ATM 401/501Status of Forecasting: Spring 2013
1. Forecasting at NCEP• Environmental Modeling Center
http://www.emc.ncep.noaa.gov/• Ocean Prediction Center
http://www.opc.ncep.noaa.gov/• National Hurricane Center
http://www.nhc.noaa.gov/• Hydrometeorological Prediction Center
http://www.hpc.ncep.noaa.gov/• Storm Prediction Center
http://www.spc.noaa.gov/
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Central Computer System (CCS)
• Transition to IBM Power 6 complete– Declared operational
August 12, 2009– 69.7 trillion calculations/sec– Factor of 4 increase over the
IBM Power5 – 4,992 processors– 20 terabytes of memory – 330 terabytes of disk space– 1.7 billion observations/day– 27.8 Million model fields/day
• Primary: Gaithersburg, MD• Backup: Fairmont, WV
– Guaranteed switchover in 15 minutes
– Web access to models as they run on the CCS
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GFS “Drop Outs”
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ECMWF “Drop Outs”
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Some FindingsStill Very Preliminary
• Data focus on satellite and aircraft• Could be bias issues
– Potential warm bias in aircraft data– Several bias issues in satellite– Potential impact from over sampling (aircraft and
satellite)
• Could have analysis issue with respect to how the observation biases are handled, especially in the tropics and the SH– Size of analysis window (2.5 hr vs 6 hr vs 12 hr)
could be an important issue
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Poor Forecasts or Skill Score “Dropouts” Lower GFS Performance
For this Dropoutsee IC on next slide...
October 26, 2008
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Trough in central Pacific shows differences between ECMWF(no dropout) and GFS (had dropout)
Ovrly “patch” boxECM in this area
but GSI elsewhere
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NCEP Climate Forecast System Reanalysis
• Complete as of November 2009
• A global, high resolution, coupled atmosphere-ocean-land surface-sea ice system for the period 1979-2009.
• Atmosphere resolution: 38 km (T382), 64 levels extending to 0.26 hPa
• Ocean resolution: 0.25 degree at the equator, 40 levels to 4737 m depth
• Products available at hourly time resolution, 0.5 degree horizontal resolution, and at 37 standard pressure levels
• CFSR products began being transmitted on December 7, 2009, to the NOAA National Climate Data Center (NCDC), the official dissemination outlet for the CFSR. NCAR will also host a copy of the CFSR.
• CPC is in the process of generating its operational climate diagnostics products from the CFSR data.
• An operational implementation of the entire CFSR system, including all hindcast model runs, is scheduled for Q1 of FY11.
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ATM 401/501Status of Forecasting: Spring 2013
1. Forecasting at NCEP• Environmental Modeling Center
http://www.emc.ncep.noaa.gov/• Ocean Prediction Center
http://www.opc.ncep.noaa.gov/• National Hurricane Center
http://www.nhc.noaa.gov/• Hydrometeorological Prediction Center
http://www.hpc.ncep.noaa.gov/• Storm Prediction Center
http://www.spc.noaa.gov/
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Extratropical Oceanic Cyclogenesis - Major Forecast Challenges Remain
• Under-prediction of most rapid intensification phase of extratropical cyclogenesis – hurricane force winds
(It is not just a tropical problem!!)
GFS 96 hr VT 1200 UTC 8 Nov 2008 Analysis 1200 UTC 8 Nov 2008
983 mbMax Wind 46 knotsGALE
974 mbMax Wind 70 knotsHURRICANE FORCE
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Hurricane Force Extratropical Cyclones Detection and Warning Trend using
QuikSCAT
WARNINGCATEGORIES
Pre- QSCAT1. GALE 34-47 kt1. GALE 34-47 kt2. STORM >48
QSCAT ERA1. GALE 34-47 kt1. GALE 34-47 kt
2. STORM 48 -63 kt3. HURCN FORCE
> 64 kt
QuikSCAT Launch Jun 99
Hurricane Force Wind WarningInitiated Dec 00
12.5 km QuikSCATavailable May 04
25 km QuikSCATAvailable in N-AWIPS
Oct 01
Improved wind algorithm and rain flag Oct 06
•Hurricane Force Warning Initiated Dec 2000 •Detection increased with:
-Forecaster familiarity-Data availability-Improved resolution -Improved algorithm
244235
Pre-QSCAT
QSCAT ERA
3. HURCN FORCE> 64 kt
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All Cyclones All Cyclones
Hurricane Force Hurricane Force
2 & 4 day cyclone forecast skill(Observed - Forecast)
(Observed - Forecast)
Intensity (hPa) Track (n mi)
Negative (underforecast)
Negative (underforecast)
ATLPAC
ATLPAC
ATLPAC
ATLPAC
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2 & 4 day warning skillPOD
FAR
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Minimum MSLP (CFSR, Jan 1979 - Mar 2011; courtesy Ryan Maue)
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Minimum MSLP (CFSR, Jan 1979 - Mar 2011; courtesy Ryan Maue)
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Minimum MSLP (CDASv2, 1 Jan – 4 Feb 2013; courtesy Ryan Maue)
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Geographic distribution of cyclones with winds of HF intensitySep-May 2000-2007 7 yr annual average number of extratropical cyclones observed (contoured)
with hurricane force winds for the years 2001 - 2008
Major Shipping RoutesNorth Atlantic4,000/yr container transits1,000/yr bulkers
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Geographic distribution of cyclones with winds of HF intensitySep-May 2000-2007
Major Shipping RoutesNorth Pacific6,000/yr container1,500/yr bulker
7 yr annual average number of extratropical cyclones observed (contoured) with hurricane force winds for the years 2001 - 2008
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