A significant late-season winter storm will bring an expanding area of heavy snow, sleet, and freezing rain to the Northern Plains and Upper Midwest. Further south, severe thunderstorms are expected from the southern Plains into the southern Great Lakes. A multi-day excessive rain and flooding event will impact the Ozarks into the Ohio Valley through Saturday. Read More >
Regional Warning, Watch, and Advisory Criteria
The Grand Forks NWS Office will issue Advisories and Warnings for situations where the following is expected:
Winter PrecipitationStatements for these hazards will be issued under the header "WSWFGF (WWUS43 KFGF)." for situations when the following criteria are met: Central Region Winter Weather Products Specification For Snow & Ice Threats:
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Thunderstorm ThreatsSevere Thunderstorm RISK Terminology The level of categorical risk in the Day 1-3 Convective Outlooks is derived from probability forecasts of tornadoes, damaging winds, and large hail on Days 1 and 2, and a combined severe weather risk on Day 3.
SEVERE THUNDERSTORM or TORNADO WATCH Severe thunderstorms with large hail, damaging winds, and/or tornadoes are possible, but the exact time and location of storm development is still uncertain. A watch means be prepared for storms. SEVERE THUNDERSTORM WARNING A severe thunderstorm is imminent or occurring; it is either detected by weather radar or reported by storm spotters. A severe thunderstorm is one that produces winds 58 mph or stronger and/or hail 1 inch in diameter or larger. A warning means to take shelter. TORNADO WARNING A tornado is imminent or occurring; it is either detected by weather radar or reported by storm spotters. A warning means to take shelter. FLOOD WATCH Conditions are favorable for flash flooding. A watch means to get prepared for possible flooding. FLASH FLOOD WARNING Life-threatening flooding is imminent or occurring; it is either detected by weather radar, indicated by stream gauges, or reported by storm spotters. A flash flood is a flood that occurs very quickly; it is caused by heavy rainfall over a short period of time or from a dam break. A warning means to leave low-lying or flood prone areas. |
Non Precipitation Phenomena Warning TerminologyStatements for these hazards will be issued under the header "NPWFGF (WWUS73 KFGF)." for situations when the following criteria are met: Central Region Non-Precipitation Weather Products Specification For Winds NOT associated with a specific Thunderstorm:
For Widespread Frosts/Freezes, after the beginning and before the end of the "growing season":
For High Heat Indicies:
For Widespread Dense Fog:
For Extreme Cold:
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Fire Weather ProductsStatements for these hazards will be issued under the header "RFWFGF (WWUS83 KFGF)" for situations when the following criteria are met:
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