15 Aug 2023 | 07:56 AM UTC
Mexico: Adverse weather conditions forecast across much of the country through at least Aug. 18 /update 1
Severe weather forecast across much of Mexico through at least Aug. 18. Possible flooding and associated disruptions.
Event
Severe weather is forecast across much of Mexico through at least Aug. 18. The North American monsoon will continue to bring showers and storms to northwestern regions over the coming days. A tropical wave and a low-pressure area with the potential for cyclonic development moving up the western Pacific coast will bring heavy rainfall, strong winds, and rough seas to southern and western regions. Isolated storms and showers are possible across much of the rest of the country over the coming days. Strong winds, lightning, and possible hail may accompany storms. Strong winds may generate dust storms in central and northern regions.
Rainfall totals of 7.5-15 cm (3-6 inches) are possible in parts of Chiapas, Oaxaca, Tabasco, and Veracruz states Aug. 15, Guerrero Aug. 16, Colima and Michoacan Aug. 17-18, and Jalisco, Sinaloa, and Sonora Aug. 18. Totals of 2.5-7.5 cm (1-3 inches) are expected across parts of central, northwestern, southeastern, southern, and western Mexico Aug. 15-18. The heavy downpours could trigger flooding in low-lying areas and landslides on unstable slopes. Winds gusting up to 120 kph (75 mph) and waves of up to 6 meters (20 feet) are possible in western coastal areas.
High temperatures will likely persist in northern regions over the coming days. Temperatures of over 40 C (104 F) are forecast in affected areas and may exceed 45 C (113 F) in parts of Baja California and Sonora Aug. 15-18, Sinaloa Aug. 15 and 17, and Baja California Sur Aug. 17.
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.
In areas where there is an extended period of oppressive heat, conditions may produce ideal circumstances for wildfire growth. Heatwaves also threaten vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to some passengers' hospitalization.
The severe weather could contribute to transport disruptions throughout affected regions. Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather may also trigger flight delays and cancellations at airports across the affected region. Authorities may temporarily suspend port operations along the Pacific coast if strong winds trigger hazardous sea conditions, impacting freight and passenger maritime traffic. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas with heavy rainfall and potential track inundation.
Very high temperatures may damage road surfaces, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at regional airports, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.
Advice
Monitor local media for updated emergency and weather information. Seek updated information on weather and road conditions before driving or routing shipments through areas where severe weather is forecast. Plan accordingly for potential delivery delays if routing shipments by truck through the affected area. Do not attempt to drive through flooded areas. Confirm flights.
During heatwaves, remain indoors in air conditioning when possible. If outdoor activities are necessary, frequently rest in shaded areas; avoid activity during the hottest times of the day. Stay well hydrated by drinking plenty of fluids. Avoid alcoholic beverages, which are dehydrating; drink bottled or boiled water. Wear loose-fitting, light-colored clothing. Cotton fabrics are more cooling than synthetics. Promptly seek medical attention if signs of heat exhaustion or heat stroke develop. Charge battery-powered devices in the case of prolonged electricity outages.
