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FXUS66 KSGX [San Diego/WFO CA] 271030 AFDSGX ∨

FXUS66 KSGX 271030
AFDSGX [HEAD]

National Weather Service San Diego California 3:30am PDT Sat Jul 27 2024 ∨

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
330 AM PDT SAT JUL 27 2024 [HEAD]

Synopsis. A weather disturbance moving through Northern California will bring cooler and breezier weather for mountains and deserts today. Strongest winds will be this afternoon and evening. Dry air has moved in from the north and will continue to spread southward resulting in lower humidity and virtually no chance for afternoon thunderstorms. Greater coverage of morning low clouds is expected for coastal areas over the weekend with the low clouds becoming patchier again next week. There will be a gradual warming trend next week, along with a slow increase in humidity. There is uncertainty when the next threat for thunderstorms occurs but slight chance is in the forecast for late next week. ∨

.SYNOPSIS...
A WEATHER DISTURBANCE MOVING THROUGH NORTHERN CALIFORNIA WILL
BRING COOLER AND BREEZIER WEATHER FOR MOUNTAINS AND DESERTS TODAY.
STRONGEST WINDS WILL BE THIS AFTERNOON AND EVENING. DRY AIR HAS
MOVED IN FROM THE NORTH AND WILL CONTINUE TO SPREAD SOUTHWARD
RESULTING IN LOWER HUMIDITY AND VIRTUALLY NO CHANCE FOR AFTERNOON
THUNDERSTORMS. GREATER COVERAGE OF MORNING LOW CLOUDS IS EXPECTED
FOR COASTAL AREAS OVER THE WEEKEND WITH THE LOW CLOUDS BECOMING
PATCHIER AGAIN NEXT WEEK. THERE WILL BE A GRADUAL WARMING TREND
NEXT WEEK, ALONG WITH A SLOW INCREASE IN HUMIDITY. THERE IS
UNCERTAINTY WHEN THE NEXT THREAT FOR THUNDERSTORMS OCCURS BUT
SLIGHT CHANCE IS IN THE FORECAST FOR LATE NEXT WEEK. [DISC]

Discussion. For extreme southwestern California including Orange… San Diego… western Riverside and southwestern San Bernardino Counties. ∨

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES... [DISC]

This morning, diurnal drainage winds have pushed the marine layer low clouds offshore in San Diego County but they are slowly making a return to the coastal areas and will cover much of the coastal zones by about 8am. Yesterday afternoon was about as warm as Thursday in the lower deserts but cooler in and west of the mountains. ∨

THIS MORNING, DIURNAL DRAINAGE WINDS HAVE PUSHED THE MARINE LAYER
LOW CLOUDS OFFSHORE IN SAN DIEGO COUNTY BUT THEY ARE SLOWLY MAKING
A RETURN TO THE COASTAL AREAS AND WILL COVER MUCH OF THE COASTAL
ZONES BY ABOUT 8 AM. YESTERDAY AFTERNOON WAS ABOUT AS WARM AS
THURSDAY IN THE LOWER DESERTS BUT COOLER IN AND WEST OF THE MTNS. [DISC]

The relatively cooler conditions will continue through Tuesday in response to a trough of low pressure moving inland to our north and displacing the high pressure ridge to the south and east. The trough will bring cooler drier air in southwest flow aloft, effectively ending the threat of afternoon thunderstorms. It will also bring stronger onshore flow and increase the marine layer presence west of the mountains, with an increase in coastal low clouds during the nights and mornings. With the stronger onshore flow, we will see west winds gusting 25–40 mph in mtn passes and on desert slopes this afternoon and evening. ∨

THE RELATIVELY COOLER CONDITIONS WILL CONTINUE THROUGH TUESDAY IN
RESPONSE TO A TROUGH OF LOW PRESSURE MOVING INLAND TO OUR NORTH
AND DISPLACING THE HIGH PRESSURE RIDGE TO THE SOUTH AND EAST. THE
TROUGH WILL BRING COOLER DRIER AIR IN SOUTHWEST FLOW ALOFT,
EFFECTIVELY ENDING THE THREAT OF AFTERNOON THUNDERSTORMS. IT WILL
ALSO BRING STRONGER ONSHORE FLOW AND INCREASE THE MARINE LAYER
PRESENCE WEST OF THE MTNS, WITH AN INCREASE IN COASTAL LOW CLOUDS
DURING THE NIGHTS AND MORNINGS. WITH THE STRONGER ONSHORE FLOW, WE
WILL SEE WEST WINDS GUSTING 25-40 MPH IN MTN PASSES AND ON DESERT
SLOPES THIS AFTERNOON AND EVENING. [DISC]

Temperatures begin to rise again as the trough moves off to the north east into the northern Rockies and the high pressure ridge becomes centered over texan and expands into the desert southwest once again. The position and westward expansion of the high will not only raise temperatures generally and reduce the marine layer presence west of the mountains, it will also allow for monsoonal moisture to begin moving back into Southern California. It's still too soon to say with any confidence which day will be the one when we see a return of afternoon thunderstorms. ∨

TEMPERATURES BEGIN TO RISE AGAIN AS THE TROUGH MOVES OFF TO THE
NORTH EAST INTO THE NORTHERN ROCKIES AND THE HIGH PRESSURE RIDGE
BECOMES CENTERED OVER TEXAN AND EXPANDS INTO THE DESERT SOUTHWEST
ONCE AGAIN. THE POSITION AND WESTWARD EXPANSION OF THE HIGH WILL
NOT ONLY RAISE TEMPERATURES GENERALLY AND REDUCE THE MARINE LAYER
PRESENCE WEST OF THE MTNS, IT WILL ALSO ALLOW FOR MONSOONAL
MOISTURE TO BEGIN MOVING BACK INTO SOCAL. IT`S STILL TOO SOON TO
SAY WITH ANY CONFIDENCE WHICH DAY WILL BE THE ONE WHEN WE SEE A
RETURN OF AFTERNOON TSTMS. [DISC]

Aviation. 270945… coast… low clouds are expected to move onshore this morning with more uniform coverage than previous nights. Marine layer clouds are expected to cover coastal areas and parts of the western valleys overnight. Bases will be around 800–1200 feet MSL [(above) Mean Sea Level] with local visibility reduced 1–5 sm on higher coastal terrain and in western valleys. Low clouds scatter out Saturday by 15–18Z [8–11am PDT]. Cloud formation is expected to be limited across Orange County with patchy conditions in San Diego County. ∨

.AVIATION...
270945...COAST...LOW CLOUDS ARE EXPECTED TO MOVE ONSHORE THIS
MORNING WITH MORE UNIFORM COVERAGE THAN PREVIOUS NIGHTS. MARINE
LAYER CLOUDS ARE EXPECTED TO COVER COASTAL AREAS AND PARTS OF THE
WESTERN VALLEYS OVERNIGHT. BASES WILL BE AROUND 800-1200 FEET MSL
WITH LOCAL VIS REDUCED 1-5SM ON HIGHER COASTAL TERRAIN AND IN
WESTERN VALLEYS. LOW CLOUDS SCATTER OUT SATURDAY BY 15-18Z. CLOUD
FORMATION IS EXPECTED TO BE LIMITED ACROSS ORANGE COUNTY WITH PATCHY
CONDITIONS IN SAN DIEGO COUNTY. [AVIA]

Mountains/deserts… similar to yesterday, slightly stronger winds expected after 21Z [2pm PDT] Sat, gusting to 25–35 kt [29–40 mph] through Saturday evening. Moderate up/downdrafts in lee of mountains. ∨

MOUNTAINS/DESERTS... SIMILAR TO YESTERDAY, SLIGHTLY STRONGER WINDS
EXPECTED AFTER 21Z SAT, GUSTING TO 25-35 KT THROUGH SAT EVENING. MOD
UP/DOWNDRAFTS IN LEE OF MOUNTAINS. [AVI2]

Marine. No hazardous marine conditions are expected through Wednesday. ∨

.MARINE...
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY. [AVIA]

Skywarn… skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. ∨

.SKYWARN...
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. [DISC]

SGX [San Diego/WFO CA] Watches/Warnings/Advisories

California: none.
Pacific Ocean: none. ∨

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE. [WARN]

Public: PG; Aviation/Marine: SUK ∨

PUBLIC...PG
AVIATION/MARINE...SUK [CRED]

Weather NWS glossary About NWS point forecasts Hourly Weather Graph Long-range forecast Radar Satellite Max Temps Graphical Forecast	Area Forecast Discussion FXUS66 KSGX [San Diego/WFO CA] 271030 AFDSGX ∨ FXUS66 KSGX 271030 AFDSGX [HEAD] National Weather Service San Diego California 3:30am PDT Sat Jul 27 2024 ∨ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 330 AM PDT SAT JUL 27 2024 [HEAD] Synopsis. A weather disturbance moving through Northern California will bring cooler and breezier weather for mountains and deserts today. Strongest winds will be this afternoon and evening. Dry air has moved in from the north and will continue to spread southward resulting in lower humidity and virtually no chance for afternoon thunderstorms. Greater coverage of morning low clouds is expected for coastal areas over the weekend with the low clouds becoming patchier again next week. There will be a gradual warming trend next week, along with a slow increase in humidity. There is uncertainty when the next threat for thunderstorms occurs but slight chance is in the forecast for late next week. ∨ .SYNOPSIS... A WEATHER DISTURBANCE MOVING THROUGH NORTHERN CALIFORNIA WILL BRING COOLER AND BREEZIER WEATHER FOR MOUNTAINS AND DESERTS TODAY. STRONGEST WINDS WILL BE THIS AFTERNOON AND EVENING. DRY AIR HAS MOVED IN FROM THE NORTH AND WILL CONTINUE TO SPREAD SOUTHWARD RESULTING IN LOWER HUMIDITY AND VIRTUALLY NO CHANCE FOR AFTERNOON THUNDERSTORMS. GREATER COVERAGE OF MORNING LOW CLOUDS IS EXPECTED FOR COASTAL AREAS OVER THE WEEKEND WITH THE LOW CLOUDS BECOMING PATCHIER AGAIN NEXT WEEK. THERE WILL BE A GRADUAL WARMING TREND NEXT WEEK, ALONG WITH A SLOW INCREASE IN HUMIDITY. THERE IS UNCERTAINTY WHEN THE NEXT THREAT FOR THUNDERSTORMS OCCURS BUT SLIGHT CHANCE IS IN THE FORECAST FOR LATE NEXT WEEK. [DISC] Discussion. For extreme southwestern California including Orange… San Diego… western Riverside and southwestern San Bernardino Counties. ∨ .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... [DISC] This morning, diurnal drainage winds have pushed the marine layer low clouds offshore in San Diego County but they are slowly making a return to the coastal areas and will cover much of the coastal zones by about 8am. Yesterday afternoon was about as warm as Thursday in the lower deserts but cooler in and west of the mountains. ∨ THIS MORNING, DIURNAL DRAINAGE WINDS HAVE PUSHED THE MARINE LAYER LOW CLOUDS OFFSHORE IN SAN DIEGO COUNTY BUT THEY ARE SLOWLY MAKING A RETURN TO THE COASTAL AREAS AND WILL COVER MUCH OF THE COASTAL ZONES BY ABOUT 8 AM. YESTERDAY AFTERNOON WAS ABOUT AS WARM AS THURSDAY IN THE LOWER DESERTS BUT COOLER IN AND WEST OF THE MTNS. [DISC] The relatively cooler conditions will continue through Tuesday in response to a trough of low pressure moving inland to our north and displacing the high pressure ridge to the south and east. The trough will bring cooler drier air in southwest flow aloft, effectively ending the threat of afternoon thunderstorms. It will also bring stronger onshore flow and increase the marine layer presence west of the mountains, with an increase in coastal low clouds during the nights and mornings. With the stronger onshore flow, we will see west winds gusting 25–40 mph in mtn passes and on desert slopes this afternoon and evening. ∨ THE RELATIVELY COOLER CONDITIONS WILL CONTINUE THROUGH TUESDAY IN RESPONSE TO A TROUGH OF LOW PRESSURE MOVING INLAND TO OUR NORTH AND DISPLACING THE HIGH PRESSURE RIDGE TO THE SOUTH AND EAST. THE TROUGH WILL BRING COOLER DRIER AIR IN SOUTHWEST FLOW ALOFT, EFFECTIVELY ENDING THE THREAT OF AFTERNOON THUNDERSTORMS. IT WILL ALSO BRING STRONGER ONSHORE FLOW AND INCREASE THE MARINE LAYER PRESENCE WEST OF THE MTNS, WITH AN INCREASE IN COASTAL LOW CLOUDS DURING THE NIGHTS AND MORNINGS. WITH THE STRONGER ONSHORE FLOW, WE WILL SEE WEST WINDS GUSTING 25-40 MPH IN MTN PASSES AND ON DESERT SLOPES THIS AFTERNOON AND EVENING. [DISC] Temperatures begin to rise again as the trough moves off to the north east into the northern Rockies and the high pressure ridge becomes centered over texan and expands into the desert southwest once again. The position and westward expansion of the high will not only raise temperatures generally and reduce the marine layer presence west of the mountains, it will also allow for monsoonal moisture to begin moving back into Southern California. It's still too soon to say with any confidence which day will be the one when we see a return of afternoon thunderstorms. ∨ TEMPERATURES BEGIN TO RISE AGAIN AS THE TROUGH MOVES OFF TO THE NORTH EAST INTO THE NORTHERN ROCKIES AND THE HIGH PRESSURE RIDGE BECOMES CENTERED OVER TEXAN AND EXPANDS INTO THE DESERT SOUTHWEST ONCE AGAIN. THE POSITION AND WESTWARD EXPANSION OF THE HIGH WILL NOT ONLY RAISE TEMPERATURES GENERALLY AND REDUCE THE MARINE LAYER PRESENCE WEST OF THE MTNS, IT WILL ALSO ALLOW FOR MONSOONAL MOISTURE TO BEGIN MOVING BACK INTO SOCAL. IT`S STILL TOO SOON TO SAY WITH ANY CONFIDENCE WHICH DAY WILL BE THE ONE WHEN WE SEE A RETURN OF AFTERNOON TSTMS. [DISC] Aviation. 270945… coast… low clouds are expected to move onshore this morning with more uniform coverage than previous nights. Marine layer clouds are expected to cover coastal areas and parts of the western valleys overnight. Bases will be around 800–1200 feet MSL [(above) Mean Sea Level] with local visibility reduced 1–5 sm on higher coastal terrain and in western valleys. Low clouds scatter out Saturday by 15–18Z [8–11am PDT]. Cloud formation is expected to be limited across Orange County with patchy conditions in San Diego County. ∨ .AVIATION... 270945...COAST...LOW CLOUDS ARE EXPECTED TO MOVE ONSHORE THIS MORNING WITH MORE UNIFORM COVERAGE THAN PREVIOUS NIGHTS. MARINE LAYER CLOUDS ARE EXPECTED TO COVER COASTAL AREAS AND PARTS OF THE WESTERN VALLEYS OVERNIGHT. BASES WILL BE AROUND 800-1200 FEET MSL WITH LOCAL VIS REDUCED 1-5SM ON HIGHER COASTAL TERRAIN AND IN WESTERN VALLEYS. LOW CLOUDS SCATTER OUT SATURDAY BY 15-18Z. CLOUD FORMATION IS EXPECTED TO BE LIMITED ACROSS ORANGE COUNTY WITH PATCHY CONDITIONS IN SAN DIEGO COUNTY. [AVIA] Mountains/deserts… similar to yesterday, slightly stronger winds expected after 21Z [2pm PDT] Sat, gusting to 25–35 kt [29–40 mph] through Saturday evening. Moderate up/downdrafts in lee of mountains. ∨ MOUNTAINS/DESERTS... SIMILAR TO YESTERDAY, SLIGHTLY STRONGER WINDS EXPECTED AFTER 21Z SAT, GUSTING TO 25-35 KT THROUGH SAT EVENING. MOD UP/DOWNDRAFTS IN LEE OF MOUNTAINS. [AVI2] Marine. No hazardous marine conditions are expected through Wednesday. ∨ .MARINE... NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH WEDNESDAY. [AVIA] Skywarn… skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. ∨ .SKYWARN... SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. [DISC] SGX [San Diego/WFO CA] Watches/Warnings/Advisories California: none. Pacific Ocean: none. ∨ .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. [WARN] Public: PG; Aviation/Marine: SUK ∨ PUBLIC...PG AVIATION/MARINE...SUK [CRED]	Point Forecast Poway CA 27 Jul 03:23am PDT Overnight Partly cloudy, with a low around 62°. Calm wind. Saturday Sunny, with a high near 85°. Light SW wind becoming west 5 to 10 mph in the afternoon. Saturday Night Mostly clear, with a low around 59°. West wind around 5 mph becoming calm in the evening. Sunday Patchy fog before 11am. Otherwise, sunny, with a high near 83°. Light and variable wind becoming west 5 to 10 mph in the afternoon. Sunday Night Mostly clear, with a low around 58°. West wind around 5 mph becoming calm in the evening. Monday Patchy fog before 11am. Otherwise, sunny, with a high near 83°. Monday Night Mostly clear, with a low around 58°. Tuesday Patchy fog before 11am. Otherwise, sunny, with a high near 83°. Tuesday Night Mostly clear, with a low around 60°. Wednesday Patchy fog before 11am. Otherwise, sunny, with a high near 85°. Wednesday Night Partly cloudy, with a low around 61°. Thursday Patchy fog. Otherwise, mostly sunny, with a high near 86°. Thursday Night Mostly clear, with a low around 62°. Friday Patchy fog. Otherwise, sunny, with a high near 89°. Overnight Partly cloudy, with a low around 62. Calm wind. Saturday Sunny, with a high near 85. Light southwest wind becoming west 5 to 10 mph in the afternoon. Saturday Night Mostly clear, with a low around 59. West wind around 5 mph becoming calm in the evening. Sunday Patchy fog before 11am. Otherwise, sunny, with a high near 83. Light and variable wind becoming west 5 to 10 mph in the afternoon. Sunday Night Mostly clear, with a low around 58. West wind around 5 mph becoming calm in the evening. Monday Patchy fog before 11am. Otherwise, sunny, with a high near 83. Monday Night Mostly clear, with a low around 58. Tuesday Patchy fog before 11am. Otherwise, sunny, with a high near 83. Tuesday Night Mostly clear, with a low around 60. Wednesday Patchy fog before 11am. Otherwise, sunny, with a high near 85. Wednesday Night Partly cloudy, with a low around 61. Thursday Patchy fog. Otherwise, mostly sunny, with a high near 86. Thursday Night Mostly clear, with a low around 62. Friday Patchy fog. Otherwise, sunny, with a high near 89.
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