Los Angeles County San Gabriel Valley Severe Watches & Warnings NOAA Weather Radio

Special Statement
Statement as of 7:48 AM PDT on July 28, 2015

...Hot and humid conditions with possible thunderstorms Wednesday through Sunday...

High pressure building aloft along with weak onshore flow will bring an extended period of hot weather to southwest California. The warm up will start today and continue through Thursday before leveling off Friday and Saturday. The hottest conditions are expected Thursday and Friday...when much of the area away from the coast will range from 95 to 103 degrees. Humidity will also increase Wednesday through Friday...which will make the air feel hotter than measured. The resultant heat index values will approach excessive heat criteria...creating dangerous conditions for those at risk of heat-related illness. This heat may impact participants and spectators for the special olympic world games...especially in valley venues.

The additional humidity caused by moist southeast flow will also bring a possibility of showers and thunderstorms to the region Wednesday through Sunday. The most favorable locations include the mountains and interior valleys in the afternoon and evening hours...but some coastal and valley areas could see showers and thunderstorms during the night and early morning hours. On Wednesday...the risk of flooding will be minimal but dry lightning will be a concern. By Wednesday night and Thursday however...deep moisture and very weak winds aloft will pose a heightened risk of flash flooding..which could continue through Friday. A Flash Flood Watch may be needed for mountains and interior valleys during this time.

Rk/asr

748 am PDT Tue Jul 28 2015

...Hot and humid conditions with possible thunderstorms Wednesday through Sunday...

High pressure building aloft along with weak onshore flow will bring an extended period of hot weather to southwest California. The warm up will start today and continue through Thursday before leveling off Friday and Saturday. The hottest conditions are expected Thursday and Friday...when much of the area away from the coast will range from 95 to 103 degrees. Humidity will also increase Wednesday through Friday...which will make the air feel hotter than measured. The resultant heat index values will approach excessive heat criteria...creating dangerous conditions for those at risk of heat-related illness. This heat may impact participants and spectators for the special olympic world games...especially in valley venues.

The additional humidity caused by moist southeast flow will also bring a possibility of showers and thunderstorms to the region Wednesday through Sunday. The most favorable locations include the mountains and interior valleys in the afternoon and evening hours...but some coastal and valley areas could see showers and thunderstorms during the night and early morning hours. On Wednesday...the risk of flooding will be minimal but dry lightning will be a concern. By Wednesday night and Thursday however...deep moisture and very weak winds aloft will pose a heightened risk of flash flooding..which could continue through Friday. A Flash Flood Watch may be needed for mountains and interior valleys during this time.

Rk/asr

748 am PDT Tue Jul 28 2015

...Hot and humid conditions with possible thunderstorms Wednesday through Sunday...

High pressure building aloft along with weak onshore flow will bring an extended period of hot weather to southwest California. The warm up will start today and continue through Thursday before leveling off Friday and Saturday. The hottest conditions are expected Thursday and Friday...when much of the area away from the coast will range from 95 to 103 degrees. Humidity will also increase Wednesday through Friday...which will make the air feel hotter than measured. The resultant heat index values will approach excessive heat criteria...creating dangerous conditions for those at risk of heat-related illness. This heat may impact participants and spectators for the special olympic world games...especially in valley venues.

The additional humidity caused by moist southeast flow will also bring a possibility of showers and thunderstorms to the region Wednesday through Sunday. The most favorable locations include the mountains and interior valleys in the afternoon and evening hours...but some coastal and valley areas could see showers and thunderstorms during the night and early morning hours. On Wednesday...the risk of flooding will be minimal but dry lightning will be a concern. By Wednesday night and Thursday however...deep moisture and very weak winds aloft will pose a heightened risk of flash flooding..which could continue through Friday. A Flash Flood Watch may be needed for mountains and interior valleys during this time.

Rk/asr

748 am PDT Tue Jul 28 2015

...Hot and humid conditions with possible thunderstorms Wednesday through Sunday...

High pressure building aloft along with weak onshore flow will bring an extended period of hot weather to southwest California. The warm up will start today and continue through Thursday before leveling off Friday and Saturday. The hottest conditions are expected Thursday and Friday...when much of the area away from the coast will range from 95 to 103 degrees. Humidity will also increase Wednesday through Friday...which will make the air feel hotter than measured. The resultant heat index values will approach excessive heat criteria...creating dangerous conditions for those at risk of heat-related illness. This heat may impact participants and spectators for the special olympic world games...especially in valley venues.

The additional humidity caused by moist southeast flow will also bring a possibility of showers and thunderstorms to the region Wednesday through Sunday. The most favorable locations include the mountains and interior valleys in the afternoon and evening hours...but some coastal and valley areas could see showers and thunderstorms during the night and early morning hours. On Wednesday...the risk of flooding will be minimal but dry lightning will be a concern. By Wednesday night and Thursday however...deep moisture and very weak winds aloft will pose a heightened risk of flash flooding..which could continue through Friday. A Flash Flood Watch may be needed for mountains and interior valleys during this time.

Rk/asr