A few showers and isolated thunderstorms moved north across southeast Arizona. A very short-lived landspout occurred northwest of Tucson.
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The episode as NWS TWC wrote it up.
A few showers and isolated thunderstorms moved north across southeast Arizona. A very short-lived landspout occurred northwest of Tucson.
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 Tucson, AZ wrote its last area forecast discussion before the first event at Aug 13, 1:44 PM MST, 4 hours 25 minutes earlier.
Area Forecast Discussion National Weather Service Tucson AZ 144 PM MST Sun Aug 13 2023 .SYNOPSIS...Isolated to scattered showers and thunderstorms then an increase in chances and coverage Monday as more moisture moves in. Tuesday into Thursday expect mainly isolated storms as we begin to lose a little moisture. Temperatures will be on a warming trend this week running 2-7 degrees above normal with Thursday looking to be the warmest day. && .DISCUSSION...The eastern half of the CWA is dominated by showers and cloud cover with the western half having been mostly clear through the morning. A few isolated thunderstorms have already formed west and just north of Tucson. The cloud cover to the east will likely make any storms that do form struggle but can't rule out an embedded thunderstorm or two. For areas west of Cochise and Graham County expect isolated to scattered showers and thunderstorms this afternoon and evening. Best chances will likely be on the Tohono O'Odham Nation. The main threats will be strong outflow winds and locally heavy rainfall. Monday looks to be more active as southeast Arizona receives an increase in moisture thanks to mid-level flow turning more southeasterly. By Monday afternoon models show PWAT values across the CWA ranging from 1.4"-1.6". CAMs show scattered convection from central Pima County eastward starting early afternoon and continuing through the evening. The threat will be there for wet microbursts with the 13/12Z HREF showing a 70 percent chance for wind speeds greater than 30 kts from Tucson eastward. With the extra moisture heavy rainfall and possible flash flooding will also be a threat. Tuesday, high pressure currently over a large area from Texas to Florida, will begin moving east and decrease moisture some especially along the AZ/NM border. As this happens the closed low off California's southern coast moves northward. This will lead to a slight downturn in storm chances and coverage Tuesday through Thursday. Temperatures will also increase from around normal today and Monday to 2-7 degrees above normal Tuesday through Thursday. Thursday looks to be the hottest day with small pockets of high heat risk possible, but not a large enough area to warrant an EHW at this time. Friday the ridge begins to move further east with the closed low off California's coast moving south. The tropics will need to be watched next weekend as Arizona could see an influx of moisture from a potential tropical storm. At this time the GEFS shows a tropical system moving up the coast of Baja and the EPS showing the same system moving west out into the Pacific. The GEFS solution would lead to a strong influx of moisture and the EPS solution would leave Arizona drier. The NBM seems to be favoring the wetter solution with temperatures much below normal and PoPs 40-70 percent. && .AVIATION...valid through 15/00z. FEW-SCT 10-14k ft MSL through 14/19Z and then SCT-BKN 10-14k ft MSL with SCT-BKN layers above 20k MSL through the rest of the forecast period. Isold to SCT -SHRA/- TSRA after 14/20Z favoring west of KTUS. Erratic wind gusts of 35-45 kts with any TSRA. Otherwise light SFC winds overnight with daytime SFC winds of NW- WLY 8-12 kts gusting up to 25 kts at times. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Daily rounds of showers and thunderstorms each afternoon and evening this week, with the best coverage on Monday. Any storms that do form are capable of producing strong, erratic, and gusty outflows. Otherwise, expect normal diurnal 20-foot winds except for east-southeast winds 10-20 mph Monday through Wednesday. Strongest winds will be in Graham County. Daytime temperatures will be around normal through Monday then increase to above normal midweek. Minimum RH in the lower elevations will generally range from 15-25% and 25-40% in the higher elevations except 45-55% Monday and Tuesday. && .TWC WATCHES/WARNINGS/ADVISORIES... None. && Public...Hardin Aviation...Malarkey Fire Weather....Hardin Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The Tucson radar (KEMX), 83 km away, was scanning. The volume nearest the first event began at 01:08 UTC.
1 tornado. Local standard time, as filed.
Trained spotters submitted a video of a landspout tornado. Location estimated to be in an open area near Orange Grove Road and Blanco Wash Trail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2023Every state in 2023This day in weather historyThe tornado archive for Arizona, 2023Warnings in Arizona, August 2023
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: 1129601.