Sweating corn will intensify a heat wave this week
Like a person breathing, corn exhales water vapor through its leaves — a process called evapotranspiration — which exacerbates humidity in agricultural regions during the summer.
In the week ahead, some of the country's most oppressive heat and humidity will be found in the Corn Belt, an area of the United States that stretches from the Dakotas to Ohio, sending heat index values toward a dangerous 115 degrees. States such as Missouri, Minnesota, Iowa, Indiana, Illinois and the Dakotas are forecast to have humidity levels that rival or exceed Florida's.
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Washington Post
7 minutes ago
- Washington Post
CWG Live updates: Uncomfortably hot and humid through midweek, relief by Friday
Welcome to updated around-the-clock by Capital Weather Gang meteorologists. Happening now: Partly to mostly sunny this morning with temperatures quickly climbing into the 80s. Muggy and hot this afternoon, with highs in the 90s. What's next? Staying hot and humid through Wednesday. A cold front brings likely showers and storms on Thursday before drier and cooler air moves in Friday through the weekend. Today's daily digit — 4/10: It's still like a steam bath out there but at least we should stay storm-free. | 🤚 Your call? The digit is a somewhat subjective rating of the day's weather, on a 0-to-10 scale. Forecast in detail Today (Monday): Partly sunny skies early become mostly sunny for a good part of the day. As the sun beats down, it's hot and also rather humid (dew points in the low 70s). Highs range from 90 to 95 but it feels like 100 or so. Light winds are from the north at around 5 to 10 mph. Confidence: High Tonight: A mostly clear and muggy late July night. Lows range from near 70 in our cooler spots to the mid-to upper 70s downtown. Calm winds. Confidence: High Tomorrow (Tuesday): Sunny and very hot. Highs range from 93 to 98 but feel like 100 to 105 with the humidity (dew points in the low 70s). There's little breeze to take an edge off the heat. Confidence: High Tomorrow night: Mostly clear to partly cloudy and warm. Lows range from the low 70s in our cooler areas to the upper 70s downtown. Very light breezes are from the south. Confidence: High A look ahead Wednesday is a lot like Monday and Tuesday: mostly sunny, hot and sticky. Highs reach the mid- to upper 90s but feel like 100 to 105. Toward the evening and overnight, a few storms could pop up, especially in our western areas. Lows are in the 70s. Confidence: Medium-High Thursday marks the transition between the hot, humid weather pattern of the week's first half and the cooler, drier pattern on the way. The cool front sweeping through sets off showers and storms, some of which could be heavy. Highs should still climb to 90 or so before clouds and storms move in. Showers and storms should gradually move off overnight, with lows in the mid-60s to near 70. Confidence: Medium The weather from Friday through the weekend looks fantastic. Humidity levels and temperatures drop and sunshine emerges. Clouds and humidity could linger during the first half of Friday before the sunny, dry weather takes over. Highs on Friday are in the upper 70s and low 80s. Sunshine should dominate both weekend days with highs again in the upper 70s and low 80s. At night, lows dip into the 60s although there could be some upper 50s in our cooler areas. Confidence: Medium-High Today's daily digit — 4/10: It's still like a steam bath out there but at least we should stay storm-free. | 🤚 Your call? The digit is a somewhat subjective rating of the day's weather, on a 0-to-10 scale. Forecast in detail Today (Monday): Partly sunny skies early become mostly sunny for a good part of the day. As the sun beats down, it's hot and also rather humid (dew points in the low 70s). Highs range from 90 to 95 but it feels like 100 or so. Light winds are from the north at around 5 to 10 mph. Confidence: High Tonight: A mostly clear and muggy late July night. Lows range from near 70 in our cooler spots to the mid-to upper 70s downtown. Calm winds. Confidence: High Tomorrow (Tuesday): Sunny and very hot. Highs range from 93 to 98 but feel like 100 to 105 with the humidity (dew points in the low 70s). There's little breeze to take an edge off the heat. Confidence: High Tomorrow night: Mostly clear to partly cloudy and warm. Lows range from the low 70s in our cooler areas to the upper 70s downtown. Very light breezes are from the south. Confidence: High A look ahead Wednesday is a lot like Monday and Tuesday: mostly sunny, hot and sticky. Highs reach the mid- to upper 90s but feel like 100 to 105. Toward the evening and overnight, a few storms could pop up, especially in our western areas. Lows are in the 70s. Confidence: Medium-High Thursday marks the transition between the hot, humid weather pattern of the week's first half and the cooler, drier pattern on the way. The cool front sweeping through sets off showers and storms, some of which could be heavy. Highs should still climb to 90 or so before clouds and storms move in. Showers and storms should gradually move off overnight, with lows in the mid-60s to near 70. Confidence: Medium The weather from Friday through the weekend looks fantastic. Humidity levels and temperatures drop and sunshine emerges. Clouds and humidity could linger during the first half of Friday before the sunny, dry weather takes over. Highs on Friday are in the upper 70s and low 80s. Sunshine should dominate both weekend days with highs again in the upper 70s and low 80s. At night, lows dip into the 60s although there could be some upper 50s in our cooler areas. Confidence: Medium-High
CBS News
6 hours ago
- CBS News
Monday will be hot, humid in Philadelphia region amid another heat wave. Here's the weather forecast.
Get ready for another heat wave! In fact, the high temperature of 91 degrees at the Philadelphia International Airport Sunday afternoon kicked off the fifth heat wave of the summer as temperatures are expected to peak in the mid-upper 90s through Wednesday afternoon. In addition to the heat and humidity on Sunday, the scattered showers and thunderstorms eventually cleared out to give way to mostly clear skies to start things off Monday morning. Temperatures will begin in the mid-70s across the region before warming into the low-middle 90s Monday afternoon. Just like on Sunday, the humidity on Monday afternoon will make it feel much warmer with feels-like temperatures soaring to near 100 degrees. While it will be unseasonably hot, it won't quite reach record territory with Monday's record high at 100 degrees. By Tuesday, the heat turns up even more with high temperatures across the region likely in the mid-upper 90s. The forecast for Tuesday and Wednesday in Philadelphia is for a high of 98 degrees, which would tie the record for both days. But what will it feel like? Along with the increasing temperatures, the humidity will also be on the rise, which will make it feel like anywhere between 100-105 degrees. When temperatures climb this high, it can be dangerous for anyone without adequate ways to stay cool and hydrated. As a result, the NEXT Weather Team has issued a NEXT Weather Alert for Tuesday and Wednesday to keep you aware of this dangerous heat. By Thursday, showers and storms will develop ahead of an approaching cold front that will put an end to this heat wave and usher in much cooler air by Friday. Friday is the start of August, and the start of an extended cooler stretch of air bringing relief from the heat through the first week of August. Highs Friday and into the weekend will be in the upper 70s to low 80s. Monday: Heat turns up. High 95, Low 74. Tuesday: NEXT Weather Alert for heat. High 98, Low 75. Wednesday: NEXT Weather Alert for heat. High 98, Low 77. Thursday: Storms end the heat. High 83, Low 77. Friday: Much cooler. High 79, Low 67. Saturday: Partly cloudy. High 81, Low 64. Sunday: Sunny skies. High 83, Low 62. NEXT Weather Radars Hourly Forecast
Yahoo
8 hours ago
- Yahoo
Smoke set to return as hazardous heat settles over Ontario
Summertime remains firmly in control for the closing days of July as muggy heat blankets portions of Ontario for the next several days. Heat warnings are in effect as the dangerous combination of high heat and excess humidity could lead to heat-related illnesses in short order. Forecasters are also monitoring the potential return of smoky conditions across parts of southern Ontario to start the new workweek. DON'T MISS: Dangerous heat persists for several days in spots We're in the midst of Ontario's fifth multi-day heat event of the season. Daytime high temperatures will hover between 30 and 34 degrees on Monday, with feels-like values ticking toward 40 when you factor in the excessive mugginess. The humidity will prevent nighttime temperatures from dropping below 20 degrees in many locations, preventing any meaningful heat relief after sunset. Smoke and haze may keep daytime temperatures a tad lower in some locations, depending on their concentration. Heat affects everyone. Vulnerable people are especially susceptible to heat-related illnesses, including those with chronic health conditions and folks living without air conditioning. Be sure to check on your elderly family, friends, and neighbours. A cold front pushing into Ontario will lower temperatures in a hurry as the week progresses. Central Ontario could see temperatures fall by Monday night, while the heat will persist until Wednesday across southern Ontario until the boundary slides south across the region. Warmest July since 2020 This is shaping up to be the warmest July in five years for many cities in southern Ontario. Toronto-Pearson has seen an average high temperature this month of 29.2°C, with Ottawa clocking in with an average of 27.9°C. RELATED: Mean temperatures—averaging together the day's high and low—above 24°C have become more common in recent decades for Toronto. Since 1999, the city has seen six Julys with temperatures above that threshold. Before that, the city only experienced that level of heat once in 1955. Smoke set to return to portions of Ontario Wildfires continue to burn on the Prairies and in the western United States. Various smoke models indicate that thick smoke and haze will spread across eastern Ontario, including Ottawa, by Monday morning. Folks across northwestern Ontario will experience increased smoke concentrations on Monday, and fine particulate matter is expected to cover most of the province and linger into Tuesday. If you're sensitive to smoke, plan ahead for any disruptions to outdoor activities to start the week. Header image created using graphics and imagery from Canva. Stay with The Weather Network for all the latest on conditions across Ontario. WATCH: Are heat waves becoming more likely in Canada? Click here to view the video
