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• <br />Anoka County Multi -- Jurisdictional <br />All Hazards Mitigation Plan <br />4.3.1.6 Severe Weather — Drought <br />Based on the map below Anoka County is depicted as moderately moist as such Drought has <br />not significantly impacted Anoka County and is not selected as a hazard for Anoka County. <br />Palmer Hydrological Drought Index <br />Long -Term (Hydrological) Conditions <br />July 2002 <br />National Climatic Data Center. NOAA <br />extreme severe <br />drought drought <br />•4.00 -3.00 <br />and to <br />below -199 <br />moderate <br />drought <br />-2.00 <br />to <br />-2 99 <br />mfd• <br />range <br />mmolsl <br />•1..99 +2.00 <br />10 to <br />.1 .99 .2.99 <br />very monist extreme* <br />.5400 .4.00 <br />to and <br />.3.99 above <br />4.2.1.7 Severe Weather - Extreme Temperature <br />According to the National Weather Service (NWS), extreme temperatures in Minnesota are <br />characterized by the issuance of Wind Chill Warnings or Advisories in the winter months, and by <br />the issuance of Excessive Heat Warnings or Heat Advisories in the summer months. <br />Excessive Cold: The NWS issues a Wind Chill Advisory for Minnesota when widespread wind <br />chills of 40 degrees below zero or lower with winds at least 10 miles per hour (mph) is expected. <br />In some parts of southern Minnesota, the threshold may be 35 degrees below zero. Wind Chill <br />Warnings are issued when widespread wind chills of 60 degrees below zero or lower with winds <br />greater than 10 mph are expected. In some parts of southern Minnesota, the threshold may be <br />50 degrees below zero. <br />Excessive Heat: The NWS issues a Heat Advisory for Minnesota when, during a 24 -hour period, <br />the Heat Index ranges from 105 to 114 degrees during the day, and remains at or above 80 <br />degrees at night. An Excessive Heat Warning is issued when, during a 24 -hour period, the Heat <br />Index reaches 115 degrees or more during the day, and remains at or above 80 degrees at <br />night. An Excessive Heat Watch may precede a Warning. <br />The table below as compiled by the National Weather Service depicts 12 extreme temperature <br />events for Minnesota since 1994. Extreme temperatures have not impacted Anoka County in <br />deaths, injuries or property damage and are not included in the plan at this time. <br />93 <br />