Las Vegas residents and visitors should brace for another round of thunderstorms today, bringing a mix of strong winds, frequent lightning, and potential heavy rainfall. According to the National Weather Service Las Vegas NV, these weather conditions are expected due to high pressure over the Four Corners and low pressure off the Pacific Coast, which has been drawing moist air into the area. The storms are predicted to start in the late morning and continue into the evening.
Today's thunderstorms may have the potential to quickly go to produce gusts exceeding 50 mph, especially in the Sierra, Owens Valley, and southern Great Basin. This has prompted the issuance of a Red Flag Warning through the evening due to the increased risk of fire from dry lightning strikes. "Little or no precipitation may reach the surface with some storms," said the NWS report, highlighting concerns in areas with fire weather conditions.
In terms of rainfall, the forecast suggests variability across the region. Northwest Arizona may see localized rainfall, with the possibility of a few tenths of an inch. The Weather Prediction Center has assigned a Marginal risk of excessive rainfall and flash flooding for northwest Arizona. On the flip side, some thunderstorms might produce minimal rain due to dry air at mid-levels, though they could still produce damaging outflow winds and frequent lightning.
As we look tomorrow, a shift in the weather pattern is expected, with the NWS predicting a more southwesterly direction of flow that will draw drier air into the region. This should reduce precipitation chances and confine the thunderstorm activity to high terrain areas, mostly affecting northwest Arizona. However, the remaining concern will largely be the gusty winds and lightning that may accompany any storms that develop.
The long-term forecast for the week suggests a period of drier conditions with limited precipitation initially, but with moisture gradually returning later in the week. Meanwhile, temperatures are set to remain above seasonal averages, with "Pockets of Major (Level 3) HeatRisk" appearing by Wednesday, particularly in low elevations along the Colorado River.
Aviation impacts are also significant given the weather situation. "There is a 50% to 60% chance of storms moving off the terrain and directly impacting the field," states the NWS report. Pilots are advised to anticipate potential disruptions due to storms and outflow winds, particularly around Harry Reid International Airport. The storm activity should, however, diminish post-sunset with winds calming down across the region overnight. Pilots and travelers should still prepare for isolated convection tomorrow, with lower coverage expected.
Spotter information issued by the NWS calls for reporting of significant weather impacts following standard operating procedures, emphasizing community involvement in tracking the weather events as they unfold.
