Definitions

storm warning

Winter storm warning

A Winter Storm Warning is a statement made by the National Weather Service of the United States which means a winter storm is occurring or is about to occur in the area, usually within 24 hours. Generally, a Winter Storm Warning is issued if at least 6 or more inches of snow or 3 or more inches of snow with a large accumulation of ice is forecast. Usually, a large accumulation of ice alone with no snow will result in either a Winter Weather Advisory, Ice Storm Warning, or in the case of light freezing rain, a Freezing Rain or Drizzle Advisory.

A similar warning is issued by Environment Canada's Meteorological Service of Canada from their offices.

Example of a Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ALBUQUERQUE NM
335 PM MST SUN DEC 9 2007

...ANOTHER WINTER STORM BEARING DOWN ON NEW MEXICO...

.A MIX OF WINTER WEATHER IS IN THE FORECAST AS AN UPPER LEVEL LOW PRESSURE SYSTEM CURRENTLY LOCATED OVER OFF THE NORTHERN BAJA CALIFORNIA COAST SLOWLY CROSSES NEW MEXICO LATE TONIGHT THROUGH TUESDAY. ALTHOUGH SNOW WILL BEGIN TO FALL IN THE NORTHERN MOUNTAINS AND NORTHEAST HIGHLANDS LATE TONIGHT...THE BULK OF THE HEAVY SNOW IS EXPECTED ON MONDAY AND MONDAY NIGHT. ON THE EASTERN PLAINS...WARM AND MOIST AIR ALOFT WILL GLIDE OVER A SHALLOW POOL OF SUBFREEZING AIR NEAR THE SURFACE.

LIGHT FREEZING DRIZZLE MAY BEGIN AS EARLY AS TONIGHT...THEN BECOME FREEZING RAIN ON MONDAY AND CONTINUE INTO MONDAY NIGHT. DENSE FOG IS ALSO POSSIBLE ON THE PLAINS. SOME UNCERTAINTY EXISTS ABOUT HOW DEEP THIS SHALLOW POOL OF COLD AIR WILL BECOME...AND THAT WILL INFLUENCE HOW FAR WEST THE LEADING EDGE OF THE FREEZING RAIN WILL DEVELOP. LOCATIONS ALONG THE TEXAS BORDER HAVE THE BEST CHANCE OF RECEIVING SIGNIFICANT ICE ACCUMULATION DUE TO FREEZING RAIN. THE WINTER PRECIPITATION COULD LINGER THROUGH TUESDAY AND TUESDAY NIGHT...POTENTIALLY REQUIRING AN EXTENSION OF ANY ADVISORIES OR WARNINGS IN EFFECT. CLOSELY MONITOR YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR FURTHER UPDATES ON THIS POTENTIALLY DANGEROUS WINTER WEATHER EVENT.

NMZ006-007-012-013-018>021-100445- /O.UPG.KABQ.WS.A.0012.071210T0700Z-071211T1300Z/ /O.NEW.KABQ.WS.W.0009.071210T0700Z-071211T1300Z/ HARDING COUNTY-FAR NORTHEAST PLAINS-CONCHAS LAKE/GUADALUPE COUNTY- QUAY COUNTY-DE BACA COUNTY-CHAVES COUNTY PLAINS-ROOSEVELT COUNTY- CURRY COUNTY- INCLUDING THE CITIES OF...ROY...CLAYTON...SANTA ROSA... TUCUMCARI...FORT SUMNER...ROSWELL...PORTALES...CLOVIS 335 PM MST SUN DEC 9 2007

...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM MST TUESDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WINTER STORM WARNING...WHICH IS IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM MST TUESDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

THE POTENTIAL EXISTS FOR FREEZING RAIN AND SLEET TO PRODUCE GREATER THAN OR EQUAL TO ONE QUARTER INCH OF ICE ACCUMULATION BY MONDAY NIGHT ACROSS NEW MEXICOS EASTERN PLAINS. AREAS OF DENSE FOG MAY ALSO DEVELOP AND REDUCE VISIBILITY BELOW ONE HALF MILE AT TIMES. NORTH OF I-40...THE FREEZING RAIN COULD CHANGE OVER TO SNOW WITH LIGHT SNOW ACCUMULATION ON TOP OF THE ICE BY TUESDAY MORNING. ICE ACCUMULATION COULD MAKE DRIVING HAZARDOUS AND MAY TOPPLE POWER LINES AND OTHER FRAGILE STRUCTURES.

REMEMBER...A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE IMMINENT OR HIGHLY LIKELY.

$$

See also

Severe weather terminology (United States)

External links

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