Upper-level divergence from an Upper-level trough off the southern CA coast led to the development of a southwest to northeast oriented rain band across the eastern half of Imperial County. 8 supported pockets of heavier rainfall rates with areas across southeastern Imperial County observing total rainfall accumulations of 1-2 inches, including across Ogliby Road where flash flooding was observed.
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 PSR wrote it up.
Upper-level divergence from an Upper-level trough off the southern CA coast led to the development of a southwest to northeast oriented rain band across the eastern half of Imperial County. Although rainfall intensity for the most part was light to moderate, precipitable water values ranging between 1.5-1.8 supported pockets of heavier rainfall rates with areas across southeastern Imperial County observing total rainfall accumulations of 1-2 inches, including across Ogliby Road where flash flooding was observed.
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 Phoenix, AZ wrote its last area forecast discussion before the first event at Sep 22, 3:20 AM PST, 10 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Phoenix AZ 420 AM MST Mon Sep 22 2025 .KEY MESSAGES... - Showers with embedded thunderstorms will continue through this morning, mainly across the western deserts, before conditions dry out area-wide by this afternoon. - Mainly dry conditions will prevail through the middle of the week before a low pressure system brings increased shower and thunderstorm chances once again by the end of the week. - Near to slightly below normal temperatures today will warm to above normal levels by the middle of the week, then likely cool below normal by the end of the week and next weekend. && .SHORT TERM /Today through Wednesday/... Early morning water vapor satellite imagery depicts an upper-level low situated more than 400 miles west of San Diego. Downstream of this upper-level low, a northeast to southwest oriented jet streak located over the southern Great Basin is aiding in sustaining an expansive band of showers with embedded thunderstorms between Imperial, Yuma, La Paz, and northwest Maricopa Counties. With the assistance from the jet-forced ascent, hi-res models are in good agreement in showing the shower activity continuing into the morning hours. Rainfall intensity for the most part should remain on the light to moderate side with very localized heavier pockets where there are embedded thunderstorms. The activity should end by later this morning into this afternoon as the jet-forced ascent lifts to the east northeast. Afternoon high temperatures today will be near to slightly below normal with readings in the mid 90s across the western deserts where there will be more persistent cloud cover with slightly warmer readings in the upper 90s to around 100 degrees across the south-central AZ lower deserts. Heading through the middle of the week, the upper-level low will remain cutoff from the main jet stream energy and meander off the CA coast. The positioning of the cut-off low off the CA coast in conjunction with another upper-level low that will dive through the central CONUS will cause the subtropical ridge to amplify over the Desert Southwest, forming an omega blocking pattern. With the region under the influence of the subtropical ridge, increasing subsidence aloft and decreasing moisture levels will lead to near zero rain chances across the lower deserts with only slight chances across the higher terrain areas of eastern AZ where there will be enough low- level moisture available to spark a few afternoon isolated storms. Under the influence of the ridge, 500 mb height fields will steadily rise, peaking at around 590-592dm during the Wednesday- Thursday timeframe. As a result, temperatures will be on the rise starting Tuesday with highs above 100 degrees, peaking on Wednesday close to 105 degrees for many areas with the latest NBM deterministic showing central Phoenix approaching 107 degrees. With temperatures in the low to mid 100s, widespread areas of moderate HeatRisk will materialize with localized areas of Major HeatRisk appearing on Wednesday, particularly across the Phoenix metro area. && .LONG TERM /Thursday through Sunday/... Heading towards the end of the week, the cut-off low is forecast to migrate inland through central/southern CA and then into AZ. However, disagreements continue amongst the model guidance in terms of the overall track and speed of the low as it migrates inland, which makes for a low confidence forecast by the end of the week into next weekend as the overall track and speed will determine the degree of moisture return and placement of upper- level dynamics. At this time, rain chances start to increase as early as Thursday afternoon/evening, mainly across the eastern third of AZ, before chances extend into the lower deserts heading into Friday due to a further increase in moisture and upper- level dynamics. Depending on the speed of the low, rain chances may linger into next weekend. Given the upper-level dynamics that will be involved with the low, if enough moisture and instability are present, then there is the potential for strong thunderstorms and areas of heavy rainfall to materialize, particularly on Friday. Please stay tuned to the latest forecast throughout the week for updates. Temperatures will still remain above normal on Thursday, in the low to mid 100s, with the subtropical high lingering over the region. Thereafter, by Friday and into the upcoming weekend with the approaching low, temperatures are expected to trend downward to below normal levels with the latest NBM showing highs topping out in the low to mid 90s and overnight lows in the low to mid 70s across the lowest deserts. && .AVIATION...Updated at 1120Z. South Central Arizona including KPHX, KIWA, KSDL, and KDVT: Expect a few showers within the Phoenix metro through 15Z with quite a bit of wind variability. Winds should settle out of the east during the latter half of the morning, but confidence is a bit low if the showers continue to persist. Winds will eventually fully switch back out of the west by around noon with mid level cloud decks aoa 10kt clearing up. Generally clear skies are expected for this evening with winds switching back to the east by 06Z. Southeast California/Southwest Arizona including KIPL and KBLH: Periods of mostly light showers will continue through the rest of this morning before diminishing during the afternoon hours. Winds will be quite variable this morning, but with a tendency to be out of the southeast at KBLH. Winds should eventually settle back out of the west at both terminals during the afternoon hours as showers diminish and skies gradually clear out. && .FIRE WEATHER... Shower activity will linger through this morning, particularly across the western districts, before conditions dry out areawide heading into this afternoon. Dry conditions with near zero rain chances will then prevail through midweek. A slow moving weather system is likely to impact the region by the end of the week leading to increasing moisture once again and potentially additional rain chances. MinRH values will remain elevated in the 25-35% range today before dropping into the 15-25% range through midweek with good to excellent overnight recoveries. Winds will generally remain light with limited afternoon upslope gusts through the next several days. && .PSR WATCHES/WARNINGS/ADVISORIES... AZ...None. CA...None. && SHORT TERM...Lojero LONG TERM...Lojero AVIATION...Kuhlman FIRE WEATHER...Lojero
The Yuma radar (KYUX), 64 km away, was scanning. The volume nearest the first event began at 11:27 UTC.
1 flash flood. Local standard time, as filed.
Ogliby Road closed due to flooding. No damages or injuries reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2025Every state in 2025This day in weather historyWarnings in California, September 2025
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: 1293203.