Low pressure centered in southern California helped to bring moisture northward from Sonora, Mexico into Southeastern Arizona. Showers and thunderstorms occurred throughout the day over areas mainly to the south and east of Tucson, with one thunderstorm producing quarter size hail near Douglas.
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The episode as NWS TWC wrote it up.
Low pressure centered in southern California helped to bring moisture northward from Sonora, Mexico into Southeastern Arizona. Showers and thunderstorms occurred throughout the day over areas mainly to the south and east of Tucson, with one thunderstorm producing quarter size hail near Douglas.
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 Apr 19, 9:30 AM MST, 4 hours 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 930 AM MST SAT APR 19 2014 .SYNOPSIS...A LOW PRESSURE SYSTEM JUST EAST OF ROCKY POINT MEXICO THIS MORNING WILL MOVE ACROSS THE AREA TODAY INTO EARLY SUNDAY. THIS SYSTEM WILL BRING A CHANCE OF SHOWERS AND THUNDERSTORMS TO THE AREA. AFTER SEASONAL TEMPERATURES TODAY...A STRONG WARMING TREND WILL BEGIN SUNDAY AND CONTINUE INTO THE FIRST PART OF THE NEW WORK WEEK. && .DISCUSSION...RAN OUT A QUICK UP TO THE FORECAST AROUND 8 AM TO INCREASE POPS AND MADE SOME MODIFICATIONS TO THE QPF VALUES FOR TODAY. RADAR SHOWED SCATTERED SHOWERS/ISOLATED THUNDER FROM TUCSON WEST...WHICH IS CLOSER TO THE UPPER LOW..WITH ISOLATED COVERAGE ACROSS EASTERN ZONES. EXPECTED AREAL COVERAGE EAST TO INCREASE THIS AFTERNOON. ALL OF THIS IS ASSOCIATED WITH AN UPPER LOW THAT WAS CENTERED JUST E OF ROCKY POINT AS OF 9 AM. PRECIPITABLE WATER VALUES WERE IN 0.65"-0.80" RANGE WHICH IS 2 STANDARD DEVIATIONS ABOVE NORMAL FOR APRIL. SO THERE IS THE THREAT FOR BRIEF LOCALIZED MODERATE RAINERS WITH STRONGEST STORMS ALONG WITH WIND GUSTS UP TO 35-40 MPH. HIGHS TODAY WILL BE TRICKY DEPENDING ON IF AN AREA GETS RAIN VERSUS NOT. THE OFFICIAL FORECAST HIGHS FOR TODAY MAY BE A DEGREE OR TWO TOO WARM BUT FOR NOW WILL LEAVE THEM AS IS. UPPER LOW TO PULL OUT OF THE AREA LATE TONIGHT WITH SHOWERS ENDING FROM WEST TO EAST. HOWEVER...THERE WILL BE A FEW LINGERING SHOWERS NEAR AZ/NM BORDER AROUND SUNRISE. RESIDUAL MOISTURE ON EASTER SUNDAY COMBINED WITH DAYTIME HEATING WILL RESULT IN A SLIGHT CHANCE OF MAINLY MOUNTAIN SHOWERS. && .AVIATION...AN UPPER LEVEL LOW JUST E OF ROCKY POINT MEXICO WILL MOVE ACROSS SRN AZ/NRN SONORA MX TODAY INTO TONIGHT. THIS SYSTEM WILL PRODUCE SCTD -SHRA/ISOLD -TRSA WITH CLOUD DECKS MAINLY ABV 10KFT AGL. SOME OF THE STRONGEST STORMS MAY PRODUCE WIND GUSTS UP TO 35 KTS AND LCLZD NR MVFR CONDS. AWAY FROM STORMS...EXPECT NORMAL DIURNAL WIND PATTERNS WITH SPEEDS MOSTLY LESS THAN 10 KTS. AVIATION DISCUSSION NOT UPDATED FOR TAF AMENDMENTS. && .FIRE WEATHER...AN UPPER LEVEL LOW JUST EAST OF ROCKY POINT MEXICO WILL MOVE ACROSS SOUTHERN ARIZONA TODAY THROUGH EARLY SUNDAY. ENOUGH MOISTURE IS PRESENT WITH THIS SYSTEM FOR SCATTERED SHOWERS WITH ISOLATED THUNDERSTORMS...WITH THE BEST THREAT FOR THE MOUNTAINS. RAINFALL AMOUNTS ARE EXPECTED TO BE LIGHT FOR MOST VALLEY AND DESERT LOCATIONS. MOUNTAIN PRECIPITATION GENERALLY AROUND A QUARTER TO PERHAPS A THIRD OF AN INCH. THE MAIN CONCERN WILL BE THE POTENTIAL FOR GUSTY AND ERRATIC WINDS ASSOCIATED WITH THE SHOWERS AND THUNDERSTORMS. A FEW SHOWERS COULD LINGER NEAR THE NEW MEXICO BORDER ON SUNDAY WITH A RETURN TO DRY CONDITIONS EARLY NEXT WEEK. .TWC WATCHES/WARNINGS/ADVISORIES...NONE. && VISIT US ON FACEBOOK...TWITTER...YOUTUBE...AND AT WEATHER.GOV/TUCSON
The Tucson radar (KEMX), 121 km away, was scanning. The volume nearest the first event began at 21:15 UTC.
1 hail. Local standard time, as filed.
Trained spotter reported 1 inch hail which accompanied a thunderstorm moving through the Douglas area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2014Every state in 2014This day in weather historyWarnings in Arizona, April 2014
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: 512692.