NWS Watch, Warning, Advisory Overlay

MesoWest has been designed for use by National Weather Service meteorologists and other professionals for protection of life and property. Comments and suggestions for improvement are encouraged and can be sent to atmos-mesowest@lists.utah.edu.

The NWS watches, warnings, and advisories for the continental U.S. can be displayed as a map overlay. The graphics are generated by the Iowa Environmental Mesonet and are updated every 5 minutes. The NWS significance levels are color coded as follows: warning (red), watch (orange), advisory (yellow), and statement (tan). The specific phenomena are defined by the VTEC Code as follows:

Code Phenonmenon Code Phenomenon Code Phenomenon
AF Ashfall AS Air Stagnation BS Blowing Snow
BW Brisk Wind BZ Blizzard CF Coastal Flood
DS Dust Storm DU Blowing Dust EC Extreme Cold
EH Excessive Heat EW Extreme Wind FA Areal Flood
FF Flash Flood FG Dense Fog FL Flood
FR Frost FW Fire Weather FZ Freeze
GL Gale HF Hurricane Force Wind HI Inland Hurricane
HS Heavy Snow HT Heat HU Hurricane
HW High Wind HY Hydrologic HZ Hard Freeze
IP Sleet IS Ice Storm LB Lake Effect Snow and Blowing Snow
LE Lake Effect Snow LO Low Water LS Lakeshore Flood
LW Lake Wind MA Marine RB Small Craft for Rough Bar
SB Snow and Blowing Snow SC Small Craft SE Hazordous Seas
SI Small Craft for Winds SM Dense Smoke SN Snow
SR Storm SU High Surf SV Severe Thunderstorm
SW Small Craft for Hazardous Seas TI Inland Tropical Storm TO Tornado
TR Tropical Storm TS Tsunami TY Typhoon
UP Ice Accretion WC Wind Chill WI Wind
WS Winter Storm WW Winter Weather ZF Freezing Fog
ZR Freezing Rain