Skip Navigation Links weather.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center

 
 

 

Follow the Weather Prediction Center on Facebook Follow the Weather Prediction Center on Twitter
NCEP Quarterly Newsletter
WPC Home
Analyses and Forecasts
   National High & Low
   WPC Discussions
   Surface Analysis
   Days ½-2½ CONUS
   Days 3-7 CONUS
   Days 4-8 Alaska
   QPF
   PQPF
   Flood Outlook
   Winter Weather
   Storm Summaries
   Heat Index
   Air Quality
   Tropical Products
   Daily Weather Map
   GIS Products
Current Watches/
Warnings

Satellite and Radar Imagery
   Satellite Images
   National Radar
Product Archive
WPC Verification
   QPF
   Medium Range
   Model Diagnostics
   Event Reviews
International Desks
Development and Training
   Development
WPC Overview
   About the WPC
   Staff
   WPC History
   Accomplishments
   Other Sites
   FAQs
Meteorological Calculators
Contact Us
   About Our Site
 
USA.gov is the U.S. Government's official web portal to all federal, state, and local government web resources and services.
 
NAM Air Quality Diagnostic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1438Z Aug 20, 2012)
 
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
 
Abbreviations and acronyms used in this product
 
Geographic Boundaries -  Map 1: Color  Black/White       Map 2: Color  Black/White


NAM AIR QUALITY DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER COLLEGE PARK MD
1038 AM EDT MON AUG 20 2012


*** The following information pertains to initialization errors
noted on the 12Z NAM that may negatively impact the performance of
the 12Z CMAQ output as used for air quality forecasting.
Specifically, errors that apply to temperature, winds, relative
humidity and precipitation are included. This discussion only
applies to geographical regions of the CONUS where air quality is
currently forecast to be degraded (i.e. CODES:
YELLOW/ORANGE/RED/PURPLE/MAROON). ***


...NORTHERN UTAH/SOUTHERN IDAHO/CENTRAL COLORADO...
THE NAM WAS 5F TOO WARM NEAR LOGAN UTAH AND ACROSS SOUTHERN IDAHO.
 THE NAM DID A POOR JOB DEPICTING THE SNAKE RIVER VALLEY TROUGH,
SHOWING WINDS WHICH WERE 5 KNOTS TOO WEAK AND NOT NORTHWESTERLY
ENOUGH IN BELLEVUE IDAHO.  WINDS WERE 5-10 KNOTS STRONGER THAN THE
NAM DEPICTION ACROSS EASTERN COLORADO.  NONE OF THE PRECIPITATION
THE NAM ADVERTISED NEAR THE CENTRAL MONTANA/IDAHO BORDER HAS COME
TO PASS. THE ACTIVITY ADVERTISED NEAR SPENCER IDAHO HAS OCCURRED,
THOUGH IT IS 70 MILES EAST-SOUTHEAST OF WHERE THE NAM WANTED IT.

...CALIFORNIA/SOUTHERN NEVADA/ARIZONA...
THE NAM WAS 5F-15F TOO WARM IN THE SOUTHEAST AND CENTRAL
CALIFORNIA, SOUTHERN ARIZONA, AND CENTRAL NEVADA.  WINDS BETWEEN
MOJAVE AND BARSTOW CALIFORNIA WERE 5 KNOTS TOO LIGHT ON THE NAM. 
THE NAM MISSED THE SHOWERS ACROSS SOUTHERN NEVADA AND NORTHERN
ARIZONA, WITH NONE OF ITS LIGHT PRECIPITATION ACROSS SOUTHERN
CALIFORNIA AND SOUTHERN ARIZONA VERIFYING.

...TEXAS/OKLAHOMA/KANSAS CITY...
THE NAM WAS 5F TOO COOL NEAR BROWNWOOD TEXAS.  THE NAM WAS TOO
EXTENSIVE WITH ITS PRECIPITATION SHIELD ACROSS SOUTHERN TEXAS,
WITH VERY LITTLE OF IT VERIFYING.

...SOUTHERN FLORIDA/SAVANNAH RIVER VALLEY/PENNSYLVANIA...
THE NAM DID A POOR JOB DEPICTING THE LAND BREEZE IN SOUTHERN
FLORIDA...SHOWING A WIND WHICH WAS TOO SOUTHERLY.  EXTREMELY
LITTLE OF THE NAM'S ADVERTISED PRECIPITATION NEAR THE
GEORGIA/SOUTH CAROLINA BORDER HAS OCCURRED.

...OHIO VALLEY/TENNESSEE VALLEY/PENNSYLVANIA...
THE NAM WAS MUCH TOO EXTENSIVE WITH ITS RAIN AREA OVER
PENNSYLVANIA, WITH LITTLE OF WHAT IT ADVERTISED IN SOUTHERN
SECTIONS OF THE STATE VERIFYING.

ROTH