Mid level moisture increased over northern Arizona and isolated thunderstorm developed. A landspout formed along a gust front from a thunderstorm.
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The episode as NWS FGZ wrote it up.
Mid level moisture increased over northern Arizona and isolated thunderstorm developed. A landspout formed along a gust front from a thunderstorm.
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 17, 3:10 PM MST, 21 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 310 PM MST Thu Jun 17 2021 .SYNOPSIS...A strong high pressure system will continue to deliver record or near record high temperatures through Friday. Excessive Heat Warnings remain in effect for portions of Yavapai, Coconino, and Navajo counties below 5000 feet. The high is expected to weaken and move southward over the weekend and early next week providing gradual relief from the current heat wave. Isolated showers and thunderstorms are forecast each afternoon and evening through at least Saturday, especially over the high terrain. && .DISCUSSION...Strong high pressure is stationed near the Four Corners this afternoon continuing the heat wave across the southwest. The high makes very little movement through the early part of the weekend with high temperatures changing very little. We have gone ahead and extended the Excessive Heat Warnings for the lower elevations through Saturday evening. High temperatures in the lower valleys are forecast to range from 100 - 116F each day while temperates in the mountains will reach into the low 90s. Take heat precautions and check on the more vulnerable populations such as children, elderly, and pets. In addition, enough mid level moisture rotating westward around the high will continue to bring isolated thunderstorms each afternoon. Thunderstorm activity will favor the mountainous terrain but a few storms will likely drift into the lower elevations as well. Lightning, gusty winds up to 50 mph and brief moderate rain are likely from these storms. The chance for storms will continue through Saturday until drier air begins to move in from the west. A drier and breezy pattern develops Sunday through early next week while temperatures begin to decrease a couple degrees each day. A much needed relief from the heat is in store. By the middle of next week, a trough developing off the west coast will lead to a deeper southerly flow over the state which may draw moisture northward. A low chance for storms is in the forecast but stay tuned for how this pattern develops. && .AVIATION...For the 00Z package...Expect VFR conditions for the next 24 hours. Winds,south to southwest at 10-15 kts gusting 20 kts along and northeast of higher terrain, will become light after 03Z. Isolated showers and thunderstorms over the higher terrain will decrease through the early evening north of I-40, but continue south of I-40. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Very hot weather will continue through Saturday. Isolated showers and thunderstorms are possible over the higher terrain each afternoon through Saturday, with the primary threats being dry lightning and gusty outflow winds. Only very localized wetting rain is possible. Expect a Haines Index of 5-6 areawide. Sunday through Tuesday...Sunday will begin a drying trend along with decreasing temperatures through early next week. In addition, look for increasing westerly wind speeds. && .FGZ WATCHES/WARNINGS/ADVISORIES...Excessive Heat Warning until 6 PM MST Saturday FOR AZZ005-006-008-012-013-037-038. && PUBLIC...MCT AVIATION...ET FIRE WEATHER...MCT For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 193 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 tornado. Local standard time, as filed.
A land spout tornado was reported by the public on Highway 191. The land spout formed along a gust front produced by a thunderstorm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2021Every state in 2021This day in weather historyThe tornado archive for Arizona, 2021Warnings in Arizona, June 2021
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: 967999.