An upper level ridge across the southwest and central US is allowing the heat dome to remain in place. Heat advisories are again in effect across the Southern Plains Today and parts of the Northern Plains for today and Sunday.
The stagnate upper level pattern is allowing for yet another day of warm and moist air to remain in place across much of the Central US. High temperatures today will range from upper 80’s to around 90 in the northern plains to the upper 90’s to lower 100’s in the southern Plains. Farther west into New Mexico and Arizona temperatures will top out between 105 to ~ 110 today. Combine these warm temperatures with the moist air and heat index values will range between the lower 90’s in northern Plains to the lower and middle 100’s in the Southern Plains.
As a result heat advisories are in effect for parts of Southern Minnesota, Iowa, South Dakota and far Northeast Nebraska. Another area of heat advisories extends across Oklahoma, Central Texas and into Louisiana, while a third area is in far Southwest Texas and New Mexico.
Due to the extreme heat and increased fire danger Red Flag warnings are in effect for parts of Arizona, Nevada and Southern California.
A little dryer air will work into the Southern Plains US on Sunday which keeps heat index conditions just below heat advisory criteria. Even so it will still be warm with high temperatures in the lower and Mid 90’s and heat index values in the upper 90’s.
Across the Northern and Central Plains temperatures will top out in the 90’s with a broad area of upper 90’s across South Dakota South into Western Kansas and Colorado. Heat index values will top out in the lower 100’s. For parts of Minnesota, South Dakota, Iowa and Nebraska the heat advisories in effect for today extend into Sunday.
The brutal heat will also remain in place in the Southwest with highs from the mid 100’s to the upper 110’s. An excessive heat watch is in effect for parts of Utah for highs on Sunday and into early next week.
Human Heat Impacts
If you must be outside today, drink plenty of fluids. Limit the intake of carbonated beverages and alcohol. Take frequent breaks and if you do start to feel the signs of heat stress or stroke which include heavy sweating, fatigue, low blood pressure, dizziness and muscle cramps, seek medical help. The Mayo clinic has more information on heat exhaustion.
Livestock Heat Impacts
Since we have already seen several days of excessive heat and some areas lows are only dropping into the 70’s, Livestock will be feeling the stress.
The Oklahoma Mesonet Cattle Stress index shows much of Oklahoma is in the Heat Danger Categories for today (Saturday).
With similar temperature and relative humidity conditions in Texas as well as north into Kansas and Nebraska and the Dakotas, livestock are likely experiencing similar stress levels. Thankfully some clouds and precipitation provided a break this morning, but latest trends as of noon on 6/18 shows that the showers and clouds are eroding. So moderate to full levels of solar radiation are expected this afternoon, during the warmest part of the day.
Livestock owners are encouraged to check on their cattle today and ensure that they have fresh and if possible cool water and ensure that they can find shade. If livestock are in pens/close proximity provide fans to increase circulation and for dairy operators ensure that your misting systems are working In addition, if possible delay feeding until this evening/tonight during the cooler part of the day.
The Missouri Extension office has more tips on how to help cattle manage the heat.
The team at WxIntegrations will continue to provide relevant information and resources to help you better understand and prepare by incorporating weather impacts into your planning and response.