Monsoon moisture brougth strong to severe thunderstorms to parts of northern Arizona.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FGZ wrote it up.
Monsoon moisture brougth strong to severe thunderstorms to parts of northern Arizona.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Flagstaff, AZ wrote its last area forecast discussion before the first event at Jun 30, 10:48 AM MST, 2 hours 5 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 1048 AM MST Sun Jun 30 2024 .SYNOPSIS...An increase in shower and thunderstorm activity is expected for the newt few days, before decreasing again from about mid-week onward. Expect light winds and seasonable temperatures early in the week, before a strong warming trend develops for the holiday weekend. && .UPDATE...Precipitable water is increasing across northern Arizona this morning due to a combination of southerly flow drawing moisture rich air into the state from the Gulf of California, as well as from outflows associated with a decayed thunderstorm complex that collapsed south of Tucson last night. Precipitable water measured from the upper-air sounding taken here in Bellemont, AZ this morning showed a value of 0.78", which is up from 0.57" the morning before. High-resolution model guidance predicts that by this afternoon, precipitable water will range from 0.75" to 1.5" area-wide. Along with the increasing moisture comes an increase in instability for thunderstorms as well. Whereas yesterday's CAPE values were largely <= 500 J/kg along and south of the Mogollon Rim, today CAPE values are expected to range from around 200 J/kg near the Grand Canyon to 900 J/kg south of the Mogollon Rim and near the Four Corners. 0-6 km bulk shear collocated with the highest instability varies between 15-25 knots. These shear values mean the threat for organized, rotating storms is low, but cannot be completely ruled out. Storm motion is forecast to be toward the north between 10-20 knots, with the thunderstorm anvils moving in the same direction, potentially shading out downstream activity. With everything considered, expect an increase in storm activity today, with the greatest activity east of a line from Prescott to Flagstaff to the Four Corners. Severe weather potential for today can be characterized by a moderate threat for flooding, with a low to moderate threat of large hail and downburst winds. Given the active day expected across the entire state, some high resolution model guidance predicts additional rounds of showers and thunderstorms pushing into the area from the south overnight. && .PREV DISCUSSION /350 AM MST/...A strong outflow, emanating from a decayed thunderstorm complex south of Tucson earlier tonight, is moving northward to the Phoenix area this morning. We are already seeing some light rain shower development in the mid-levels ahead of this outflow, with more development likely by 4-5AM, as the boundary layer outflow enters southern Yavapai County. This is all set up from the southerly flow over eastern Arizona, due to a ridge to our east and the continued presence of a trough over the Pacific NW. We expect further development this afternoon, especially from the I-17 corridor north and northeast, as higher moisture values stream into the area. By tonight, the overall pattern remains the same, but MCS development shifts northward, setting up a potential for nocturnal activity in our CWA, as active outflows push north and west overnight. Due to the cloud cover and rain-cooled air that potentially may develop tonight and early Monday, it could actually be a down day for Monday afternoon, leaving Tuesday as the next active period. By Wednesday, the Pacific NW trough finally dislodges and move east. However, instead of the sub-tropical high reestablishing itself, it will retreat eastward and allow an even stronger Pacific high to take its place. This pattern may displace moisture southward as early as Wednesday, perhaps totally drying our CWA by Thursday and Friday. This could end up being a very hot pattern for the holiday weekend. But, there is some disagreement in high placement after Day 5 or so, we will have to wait and see. && .AVIATION...Sunday 30/18Z through Monday 01/18Z...Scattered to widespread showers and thunderstorms are expected from ~19Z-02Z with greatest chances along and east of a KPAN-KSEZ-KFLG-KGCN line. Brief periods of MVFR VIS and CIGS are likely during this time. After 03Z, expect widespread -SHRA and MVFR conditions to persist with heavier showers for KPRC-KSEZ-KFLG until ~12Z-14Z. Besides for gusty and erratic outflow winds from any storms, anticipate south-southwest winds, 10-20 kts, for this afternoon, becoming south-southeast, 5-15 kts, after 03Z. OUTLOOK...Monday 01/18Z through Wednesday 03/18Z...The active pattern continues with showers and storms expected each day, tapering each night. Afternoon winds, 10-20 kts, out of the southwest on Monday, followed by west-northwest winds for Tuesday and Wednesday. && .FIRE WEATHER...Today and Monday...Scattered showers and storms are expected across much of northern Arizona each day, some activity may continue into the overnight. Gusty, erratic winds possible in and around thunderstorms. Near-normal to below normal temperatures, along with southwest wind 10-25 mph. Tuesday through Thursday...Chances for showers and thunderstorms continue through Wednesday, with drier conditions returning for Thursday. Warming temperatures, along with west winds 5-10 mph through Wednesday, becoming northwest 10-15 mph on Thursday. && .FGZ WATCHES/WARNINGS/ADVISORIES...None. && PUBLIC...RR/Peterson AVIATION...LaGuardia FIRE WEATHER...Humphreys For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 61 km away, was scanning. The volume nearest the first event began at 19:50 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
A thunderstorm produced 64 MPH wind gusts at the ADOT sensor along Interstate 40 at Two Guns at 1253 PM MST.
Heavy rain from a thunderstorm caused a 2.3 foot rise on Oak Creek in Sedona.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2024Every state in 2024This day in weather historyWarnings in Arizona, June 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1194831, 1194832.