Bit More Rain

View of Catalinas at 7:00 pm MST yesterday evening. 

A light shower built-in from the south about 8:30 pm, with some thunder and another 0.04" of rain, making total for the 1st of 0.24". I checked my records since 1999 and the wettest July was 6.90" in 2021, and the driest July was 0.49" in 2000.

The eastern Pacific remains quite active, with Gil becoming a Cat. 1 hurricane last evening. All activity is expected to remain well south of our region.

There were isolated showers around last evening, as per ALERT data (above, for 24-hours ending at 7:00 am this morning).

The 06 UTC GEFS plumes for QPF at airport (below) indicate a very quiet first week of August.

Rain on August 1st

Rain showers along the foothills last night just before midnight. Bottom shows bright CG flash about the same time.

Rain in the ALERT Network (through 8:00 am MST this morning - above) shows scattered reports north parts, with a heavy report of 0.63" south of Oro Valley. Gauge here caught 0.20" to start the month, with rain coming just after midnight.

July rainfall totals (above and below) show some heavy amounts in and near the Catalinas - we totaled 1.99" here at the house.

Isolated Showers Yesterday

View of Catalinas at 5:00 pm MST yesterday shows heavy clouds over the mountains.

Plot of detected CG flashes through 0733 UTC this early morning (above) indicates only a very few flashes in Arizona. Precipitation reports from the ALERT Network (below) show only 4 reports in and near the Catalinas. It was another rainless day here at the house.

The 06 UTC GEFS plumes for QPF are not promising for the coming week (above). The 12 UTC WRF-RR forecast through the last day of July (below) has only light showers over parts of eastern Pima County, with heaviest rain amounts staying in New Mexico.

Showers This Evening?

Pre-sunrise color at 5:30 am MST this morning, looking toward Redington Pass.

There were no detected CG flashes across Arizona yesterday, as shown by the 24-hour plot (above, from Atmo) ending at 1033 UTC (0333 am).

This morning's seven day outlook from the NHC (above) shows an active Pacific, including Cat. 1 Hurricane Iona over the Central Pacific. Off the southwestern coast of Mexico, there is a 90 percent chance that a depression or storm will develop by the end of the week.

Large anticyclone continues to dominate

much of eastern US (above, from SPC). There is a large, inverted trough over northern Mexico; however, the missing 500 mb data over New Mexico and Colorado keep us from knowing how far north this feature extends.

Forecast from the 15 UTC run of the WRF-HRRR at Atmo (above) shows just a bit of light shower activity over Pima County through midnight. The current morning forecast from the NWS Office is shown below. Forecast indicates 20 to 50 precent POPS for all periods through coming seven days.

Possible Showers At End Of Month

Sunrise, with a bit of contrail, looking toward Redington Pass at about 6:00 am MST.

Yesterday was a rare July day with no detected CG flashes across the entire state, as per plot above for 24-hours ending at 0703 UTC (a bit after midnight last night - from Atmo).

The QPF plumes from the 06 UTC GEFS runs (above, for airport) keep things dry until first part of next week.The total precipitation forecast from the 06 UTC run of the WRF-GFS at Atmo (below) shows no rainfall in Arizona through noon on Monday.

The 06 UTC GFS forecast for 500 mb (below, valid at 06 UTC on the 29th) shows a huge anticyclone dominating most of the country with an inverted trough approaching eastern Arizona, which will bring the showers indicated on the GEFS QPF plumes.

Light Showers Here

Some pre-dawn color this morning looking toward Redington Pass at 5:45 am MST. Down at bottom is view looking the same direction, showing a bright, partial rainbow at 6:40 pm yesterday.

Plot of detected CG flashes (for 24-hours ending at 0803 UTC - 0103 am - from Atmo) shows abundant lightning across eastern Pima County. There was frequent thunder here but only a light, late afternoon, shower. Plot of ALERT Network data (below - for 24-hours ending at 7:00 am this morning) indicates mostly light amounts of rainfall. Atmo reported 0.27"; we had 0.04"; TUS had 0.01" and DM reported thunder with gusts to 36 mph but only a Trace of rain. Note the heavy amounts around and south of Vail.

The 06 UTC plumes for QPF at the airport (above) indicate a long dry period into early next week. The plumes for temperature (below) indicate warming temperatures, until early next week. The GEFS POPs (second below) indicate 50 to 60 percent chances for showers early next week, toward the end of July.

Showers Across Area

Buildups over the Catalinas at 8:00 am MST this morning.

Plot of detected CG flashes (above from Atmo) shows almost no activity over eastern Pima County. However, precipitation was widspead across the ALERT Network (below and second below) for 24-hours ending at 8:00 am this morning. Amounts were mostly light, except in southern parts of the network. Here at the house there was 0.17" during a midafternoon shower; TUS had 0.13"; DM reported 0.08"; and Atmo had 0.19".

Forecast above (from the 12 UTC WRF-RR run at Atmo) indicates rainfall through midnight for much of eastern Pima County. Current forecast from the NWS Forecast Office is shown below. 

Showers In The Forecast

Clouds over the Catalinas at 7:20 am MST this morning.

The 06 UTC plumes for QPF at the airport (above) from the 06 UTC GEFS runs. Precipitaton peaks tonight and tomorrow. Plumes for temperature below indicate mild today and tomorrow and then heating up the rest of the week.

Precipitation forecast through midnight tonight (from the 12 UTC run of the WRF-RR at Atmo - above) indicates heavy precipitation for eastern Pima County - a bit earlier than the GEFS plumes, which indicate max POPs tomorrow (below).

NWS forecast graphic (above) and am details (below) also focus on best chances for rain being today.

Heavy Rains Across Region

View from campus at 0737 am MST this morning shows rain over north part of city, obscuring foothills and mountains.

Plot of detected CG flashes for 24-hours ending at 1433 UTC (0733 am - above from Atmo) this morning shows numerous flashes over our part of Pima County.

ALERT data for 24-hours ending at 7:50 am (above and below) shows numerous sites exceeding an inch and two very heavy amounts toward southwest end of the Catalinas. The airport reported  1.29"; DM had 1.25"; we had 1.10" here; and Atmo reported only 0.69". I estimate that about 0.60" fell here before midnight, with about 0.50" after midnight.

QPF plumes from SPC (above) keep the rain going at the airport through rest of day, and then shut things down for a couple of days. The morning 500 mb analysis (plagued by all the missing sites) indicates a broad, inverted trough across the south half of Arizona. Finally, a nice event breaks the dry spell that covered most of first half of July.