An upper-level ridge moved into California behind the low, bringing a warming trend to the region. Temperatures warmed into the 90s on May 20th and 21st, and then fell into the 70s the next day as an upper-level low again brought a surge of marine air through the Sacramento Delta. This marine push, combined with synoptic cooling, caused temperature falls of nearly 20 degrees. High temperatures in the central and southern San Joaquin Valley remained in the 70s on the 23rd before warming into the lower 80s on the 24th.
The low deepened the marine layer, and marine air spilled into the San Joaquin Valley through the Sacramento Delta on May 22nd, with gusts to 38 mph at both the Merced Regional Airport and the Castle Airpark. Winds also gusted to 44 mph at NAS Lemoore. Strong winds also developed across the mountains and deserts of Kern County on the 22nd, with gusts to 56 mph recorded.
An upper-level low over the Pacific Northwest brought another dry trough into the northern half of California on May 24th. As the upper-level jet stream dove around the base of the trough, it brought gusty winds to the Cache Creek area where gusts to 49 mph were recorded. The trough also deepened the marine layer, and marine air spilling through Pacheco Pass caused gusts to 35 mph as far east as Los Banos during the night of May 24th-25th and into the morning of the 25th.
The upper-level trough lingered over the state through the 28th, and then moved east of the region the next day. The trough kept gusty winds over the mountains and deserts, and the central and southern San Joaquin Valley saw periods of gusts at 25-35 mph. Light showers developed across the region, but rainfall amounts were only from a trace to a few hundredths of an inch in most spots.
As the upper-level jet dove down the back of the trough, it triggered very strong winds through and below the passes and canyons of the Kern County mountains. Gusts to around 65 mph developed below the Tehachapi Pass and spread across the southeastern Kern County desert. Strong winds created areas of blowing dust south of Rosamond during the afternoon of May 28th. Visibilities fell to near zero, and multi-vehicle accidents on Highway 14 south of the Los Angeles County-Kern County line closed the highway from Rosamond south into northern Los Angeles County.
As the trough moved east of the region on May 29th, winds began subsiding although gusts to around 50 mph continued in the normally windiest parts of the Kern County mountains and deserts. An upper-level ridge began building into California behind the trough, and high temperatures across the central and southern San Joaquin Valley warmed to near normal on May 29th and 30th, and a few degrees above normal on May 31st.
The average temperature for May at Fresno was 73.0 degrees, tying the 7th warmest May on record. Bakersfield had an average temperature of 72.7 degrees, for its 23rd warmest May on record.

High Wind in SE KERN CTY DESERT, CALIFORNIA
From 27-MAY-13 00:00:00 to 28-MAY-13 21:00:00 (PST-8)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in KERN CTY MTNS, CALIFORNIA
From 27-MAY-13 01:00:00 to 28-MAY-13 21:00:00 (PST-8)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet