Much Needed Weather Break Across the Nation
Monday, September 10th, 2012
Thanks to my good friend, Rich Koivisto, for this beautiful rainbow picture out of Arizona. Monsoon season continues (On average through the end of September). A slow moving low pressure system over Baja California is churning up Pacific moisture and dumping it in the Southwest.
The water vapor image below shows a few interesting features. The low over Baja California; The dry air in the wake of the cold front that brought severe weather to the eastern third of the country late last week and this weekend; and the new cold front approaching from the Northwest.
The National Weather Service out of San Diego, CA shared this picture on their Facebook page. Heavy rain led to flash flooding near Lake Elsinore, CA.
Flash Flood Potential
The National Weather Service continues Flash Flood Watches through AM Tuesday for all the areas shaded in green.
A SIGNIFICANT INCREASE IN MOISTURE OCCURRED OVERNIGHT AND IS NOW IN PLACE ACROSS MUCH OF THE MOJAVE DESERT AND SOUTHERN GREAT BASIN. AS AN AREA OF LOW PRESSURE SLOWLY APPROACHES FROM THE SOUTH TODAY THUNDERSTORM ACTIVITY WILL INCREASE. THESE THUNDERSTORMS WILL HAVE THE POTENTIAL TO PRODUCE VERY HEAVY RAIN AND FLASH FLOODING. THE THREAT OF FLASH FLOODING IS HIGH TODAY AND MUCH OF TONIGHT.
Heavy Southwest Rainfall
NOAA’s HPC 2 day rainfall forecast suggests the potential of 1″ to 2″ of rain in spots.
Quieter Weather Nationally
A huge bubble of high pressure has taken over across the eastern half of the nation in the wake of the cold front that brought severe weather to the Northeast on Saturday. This big bubble of high pressure will keep weather conditions quiet for the next several days!
Look at the high temperatures across the nation yesterday. Temperatures around the Great Lakes Region were nearly 5° to 15° cooler than average!
As the bubble of high pressure rolls east, a stiff southerly wind will develop on it’s backside. This will allow very warm conditions to settle into the central part of the country for the next few days. The image below shows the high temperature forecast for today. Pierre, SD could get up to 100°, which is almost 70° warmer than it was Sunday morning (36°).
The bubble of warmth will get kicked out in the central part of the country on Tuesday as a cool front slides out of Canada. Temperatures will be nearly 15° to 20° warmer than average in spots as temperatures soar into the 90s as far north as Minnesota.
Tuesday’s Approaching Cool Front
By Tuesday, the cool front from Canada will be across the High Plains/Upper Mississippi Valley. This front will also be responsible for a few showers and storms with locally heavy rain potential.
HPC 5 Day Rainfall
NOAA’s HPC 5 day rainfall forecast suggests the potential of 1″ to 2″ across parts of the central part of the country as the front shifts east through the end of the week.
Behind this cool front, temps will fall once again to near and below average readings by the end of the week/weekend.
Thanks for checking in on this Monday, have a great rest of your week
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