Jun 222009
 

As we await the start of the monsoon, the water temperatures around us seem to be important. The Pacific is apparently undergoing a signficant shift to an El Nino. Here is the animation of the global sea surface temperatures and anomaly. This could supply plenty of moisture if the monsoon gets started and draws from here. The Gulf of Mexico and Caribbean are near normal temperatures. Not as strong a moisture source. Also, the cooler water temps in the Gulf and Caribbean, and the El Nino should hinder hurricane season in the east.

As we wait, perhaps this article on the North American Monsoon is helpful

Jun 222009
 

Dewpoints have remained fairly high all month. We broached 50F for the dewpoint on Saturday. The average dewpoint (from Tucson NWS Tracking site) for the day was in the low 40′s. The moisture is trying to stream up from the Gulf of Mexico and is saturating Northern Mexico. It hasn’t quite made it to Arizona in full force, yet. One of the components of the monsoon is the formation of a thermal low pressure system. We are probably missing some heat to cause the lifting of the are to form the low pressure system.

Dones’t it have to get hot before the monsoon starts?

Jun 072009
 

Well, after May being mostly much warmer than normal, June is following the same trend as the end of May. This week’s normal high temperature is 77-78F, but we will be lucky to see temperatures above the mid-60′s. Forecasts and models for Tuesday are calling for precipitation, most likely scattered thunderstorms.  Here is a graph of June weather to date from Wunderground:

Weather to date, 6-7-09

Weather to date, 6-7-09

Jun 032009
 

There are three(3) things below that bear reading. First is the NWS May summary for Flagstaff. It was quite warm…until the end. In the end we had record breaking rain and cold.   Quite an interesting month… a quandry!

Below are temperature graphs for the month. They are self-explanatory.

It appears the trend will continue into June. Maybe not as wet, but probably more clouds than usual. Phantom Ranch had a record low temperature, yesterday.

NOUS45 KFGZ 011742
PNSFGZ

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1042 AM MST MON JUN 1 2009

…A MAY THAT STARTED AS ONE OF THE WARMEST MAYS ON RECORD ALSO
TURNED INTO ONE OF THE WETTEST…

THE FIRST 15 DAYS OF MAY SET A PACE FOR THE MONTH TO BE ONE OF THE
WARMEST ON RECORD WITH AN AVERAGE TEMPERATURE OF 56.8 DEGREES. A
LARGE PLUME OF MOISTURE THEN MOVED OVER THE AREA AND THE RECORD
SETTING PACE WAS SLOWED DUE TO THE PASSAGE OF SEVERAL WEAK LOW
PRESSURE SYSTEMS AND INCREASED CLOUD COVER. STARTING ON THE
18TH…THE FLAGSTAFF AIRPORT RECORDED PRECIPITATION ON 12 OF THE 15
REMAINING DAYS OF THE MONTH. AT LEAST A TRACE OF RAIN FELL AT THE
FLAGSTAFF AIRPORT FROM THE 20TH THROUGH 30TH. THIS 11 DAY RUN RANKS
2ND IN MOST CONSECUTIVE DAYS OF PRECIPITATION IN THE MONTH OF
MAY…AND 40TH FOR MOST CONSECUTIVE DAYS OF PRECIPITATION OVERALL.
THE RESULT WAS AN UNUSUALLY WET MAY…WITH 2.08 INCHES OF
PRECIPITATION BEING RECORDED. MAY 2009 ENDED AS THE 5TH WETTEST ON
RECORD…1.28 INCHES ABOVE THE NORMAL 0.80 INCHES OF PRECIPITATION
FLAGSTAFF NORMALLY RECEIVES IN MAY.

THE ABNORMAL PRECIPITATION STILL WAS NOT THE ONLY STORY OF
MONTH…ABNORMALLY HIGH TEMPERATURES ALSO WORKED THEIR WAY INTO THE
MIX. MAY 2009 WAS THE FIRST MAY EVER…TO NOT RECORD A LOW
TEMPERATURE OF 32 DEGREES OR BELOW. THE MONTH ENDED AS THE 2ND
WARMEST MAY ON RECORD WITH A MONTHLY AVERAGE TEMPERATURE OF 56.0
DEGREES. BREAKING THAT DOWN INTO THE HIGHS AND LOWS…THE AVERAGE
MINIMUM TEMPERATURE WAS 39.6 DEGREES…THE WARMEST AVERAGE MAY
MINIMUM TEMPERATURE EVER RECORDED. THE AVERAGE MAY MAXIMUM
TEMPERATURE CAME IN AS THE 8TH WARMEST MAY MAXIMUM WITH A VALUE OF
72.3 DEGREES.

CLARK

May Temperatures

May Temperatures

may-2009-ave-temp

May 312009
 

It has been a wet month and the San Fancisco Peaks are white once again (Downtown Webcam can get you a picture). I recorded 0.66 inches of precipitation for a monthly total of 1.99 inches. This includes the snow-like hail that fell. The National Weather Service at the airport reported only 0.36 inches leaving them just short of the 0.46 inch record. This brought them to 2.08 inches for the month which is 1.29 inches, or more than double the normal for the month. The record for May is 4.14 inches. We’ll see what today brings, but we probably won’t be seeing a record month.

The last week’s precip looks like this from radar estimation(from Intellicast):

Radar estimation of precipitation, 5-24-09 to 5-31-09

Radar estimation of precipitation, 5-24-09 to 5-31-09

It should dry out from here forward. There is a chance again today, but not as significant as yesterday. It continues to decline through this week. We should be warming slightly as well.  It should be a great week for getting the scooter back out on the road. There is a chance for more rain around the middle of June.

Apr 302009
 

The Pacific Decadal Oscillation(PDO) is a cousin of El Nino Southern Oscillation(ENSO). It operates on a much longer, decadal, time scale. The temperatures of the Northern Pacific Ocean can be a big effect on Arizona’s Precipitation. It has been negative, or cool, for several years. Recently, it has moved more severely in that direction. Here is a recent article about it: The PDO’s influence on Climate Change: How low will it go? I think there is still a valuable question about how the sun’s current low output and activity will effect our precipitation in Northern Arizona. Could the combination of a cooling climate offset the cool phase PDO?

Well, for this weekend, it looks like we could get a little precip on Saturday and Sunday. Small amounts with a slight cooling trend.

Apr 222009
 

There is suddenly a slight chance of rain this afternoon. I bet we don’t get more than sprinkle, if that. But, we are going to see temperatures coll over the next few days to a normal or slightly below normal level.

There is an chance of some moisture showing up early next week. Again, I doubt it will be much as our dry trend will probably continue until the Monsoon Season. Sorry folks.

Apr 152009
 

It snowed all day, but the accumulation was minor. But, holy cow, it got cold by noon. It was 26F in my car at lunchtime. Tomorrow, we will see what the official precip was. Not a hefty amount, but it did snow most of the day.

There could be as much as another inch of snow tomorrow. This is only being forecasted by Accuweather, but they are pretty conservative about precip forecasts for Flagstaff.

The good news is that we should be warming up for a good while. Still, we may see another bout of winter weather by the end of the month.

Hopefully, I will get my weather station back on line by the weekend. It will be really nice to read my own graphs again. I will start posting about Lake Powell Weather after that.

Apr 132009
 

We are going to see strong winds again around Wednesday. Also, it is going to get cold and possibly rain and snow(not much). But, can this really be the end of winter?

The long range forecast from the Climate Prediction Center is pointing toward warmer weather ahead. I think we will see another snow episode or two before June. We will see.

8-14 Day Outlook April 13, 2009

8-14 Day Outlook April 13, 2009

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