An excessive heat watch is a notice issued by the National Weather Service of the United States when the heat index is expected to be greater than 105 °F (41 °C) across the northern states or 110 °F (43 °C) across the southern states during the day, and/or nighttime low temperature will be at least 75 °F (24 °C) or higher for two consecutive days. Note that even with the usual northern/southern criteria, local offices, particularly those with deserts or mountainous terrain, often have their own criteria. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke.[1]
^National Weather Service. "Excessive Heat Watch". Glossary - National Weather Service. Retrieved 18 May 2011.
and 27 Related for: Excessive heat watch information
An excessiveheatwatch is a notice issued by the National Weather Service of the United States when the heat index is expected to be greater than 105 °F...
An excessiveheat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two...
A heat advisory is a notice issued by the National Weather Service of the United States. Local offices often have their own criteria. High values of the...
A tornado watch (SAME code: TOA) is a statement issued by weather forecasting agencies to advise the public that atmospheric conditions in a given region...
A severe thunderstorm watch (SAME code: SVA) is a statement issued by weather forecasting agencies to advise the public that atmospheric conditions in...
“Fire Weather Watch” is headlined in the routine forecast and issued as a product, similar to the other primary fire warning terms. That watch then remains...
"Alerting parameters Environment Canada uses for issuing a Snow Squall Watch". Criteria for public weather alerts. 2019-04-12. Retrieved 2020-02-17....
flood conditions are a possibility. In the United States, a flash flood watch is issued by the National Weather Service (NWS) when weather conditions...
known in the United States. A warning should not be confused with a tornado watch, issued in the United States by the Storm Prediction Center (SPC) and in...
used by the National Weather Service to convey special urgency in some watch or warning messages for unusually extreme and life-threatening severe weather...
activities become difficult once winds reach tropical storm force, the hurricane watch and warnings are issued in advance of the anticipated onset of tropical-storm-force...
briefly reduce visibility, heavy rainfall not expected to cause flooding, heat index or wind chill values expected to approach "advisory" criteria for one...
mittens are available. && $$ Severe weather terminology (United States) Excessiveheat warning - the polar opposite of an Extreme cold warning Environment...
Service issues heat advisories and excessiveheat warnings when it expects unusual periods of hot weather. In Adelaide, South Australia, a heat wave is five...
Officer at the National Weather Service Weather Forecast Office in Norman watched as the large, destructive tornado approached Oklahoma City. This led to...
absorbing aerosols are present in a layer aloft in the atmosphere, they can heat surrounding air which inhibits the condensation of water vapour, resulting...
Discussion Area Weather Update Daily/Monthly Hydrometeorological Products Heat Index Forecast High Seas Forecast Hydro-Met Data Report Miscellaneous Hydrologic...
THIS SMALL CRAFT ADVISORY IS IN EFFECT UNTIL 9 AM PDT SATURDAY. THE GALE WATCH IS NO LONGER IN EFFECT. * WINDS...SOUTHWEST WINDS WILL INCREASE TO 10 TO...
which are issued by the National Weather Service. One is a flash flood watch, which means that conditions are favorable for flash flooding, and the other...
emergency management agency, law enforcement, or the general public. Unlike a watch, a warning is issued to areas in the direct path of active severe thunderstorms...
warning is issued. A freeze warning is issued several hours after a freeze watch if a freeze continues to be expected. 110 WWUS74 KMOB 081005 NPWMOB URGENT...