Jan 292010

At 5 am it wasn’t foggy. At 6 am, on the west side of town, you couldn’t over 100 yards with headllights or foglights. The humidity is effectively 100%. With cooling air, the fog forms. It should burn off after the sun gets up.

This weekend, and hopefully next week, appear to have most of the snow out of the forecasts. They are small chances scattered across this time frame.

Next weekend and the following week are looking pretty snowy. Maybe not as bad as the last storm, but persistent snow for a long while.

This weekend should provide a great opportunity to continue to get rid of roof snow and potential ice dams. Be careful. Roofs can be very slippery. If you don’t know what you are doing, get professional help!

A little delayed, but we will probably see 3-8 inches from today’s storm. There is another dry system to move through over the weekend.  Then again in the early to middle of next week. The next big system is looking to be around 9-10 February. The Climate Prediction Center shows this for the outlook at that time:

8-14 Day Precipitation Outlook - Climate Prediction Center

8-14 Day Precipitation Outlook - Climate Prediction Center

Computer models beyond 14 days show a fairly strong system capable of producing double digit (in inches)  snowfalls.

After looking at the heavy snow that showed up in the models for the last few weeks, the storm we are expecting on Tuesday and Wednesday looks rather small. But, it could bring 4-8 inches. The problem is that there is now place to put it.I am still hoping it will fall apart and we will get very little.

Another storm is due next weekend, but it looks poorly organized. In any case, below average temps are forecasted for the rest of the month.

In case you missed it, here is the Daily Sun’s article on the collapse of the Jay Lively Ice Rink roof.

Lots to cover. The Kachina Peaks Wilderness Area has been closed due to avalanche hazards. Thanks to Sergeant D at the Coconino County Sheriff’s office for forwarding these:

Kachina_Peaks_Wildnerness_Area_Closed

Order Closing Kachina Peaks Wilderness Area

The first is the press release and includes a map showing the closed areas, the second is the actual order closing the area. Even if you aren’t into backcountry skiing, it’s interesting reading. Unfortunately, while Arizona Snowbowl is exempted from this closure, they are dealing with power issues and cannot open at this time. They have a ton of snow.

Agassiz Lodge at Arizona Snowbowl

Agassiz Lodge at Arizona Snowbowl

Well, this was a huge snowfall week. A record breaker by more than one  measure. From the National Weather Service:

SNOW TOTALS FROM THE ENTIRE EVENT SINCE MONDAY EVENING ARE AMONG THE
 TOP 5 GREATEST NORTHERN ARIZONA SNOW STORMS OF ALL TIME. SNOWFALL
 TOTALS (MONDAY THROUGH FRIDAY) RANGE FROM 40 TO WELL OVER 60 INCHES
 AT ELEVATIONS ABOVE 7000 FEET ALONG THE MOGOLLON RIM AND WHITE
 MOUNTAINS. THIS STORM IN FLAGSTAFF...MONDAY THROUGH
 FRIDAY...CURRENTLY RANKS AS THE 3RD GREATEST SNOW STORM OF ALL
 TIME...AND ALSO RANKS AS THE 3RD WETTEST STORMS OF ALL TIME.

I can’t wait to see the whole pile of the white stuff when I finally make it home today.

Fortunately/unfortunately, the storm door will stay open with a few inches expected on Tuesday night and Wednesday.

Thanks to Kathy in Happy Jack for her email noting that they had 30-34 inches of snow, with drifts up to 4 feet by yesterday morning.

While it continues to snows, here is an update from the National Weather Service. The radar estimate that I had hoped to publish was so inaccurate, it isn’t worth it. Reports of chest deep snow abound. Still, another 10-20 inches is predicted for Flagstaff today. And, there is another storm, albeit nothing by comparison, due on Tuesday night…and next weekend. The storm door may be open for a while.

Month to date, Flagstaff has had over 4 and a half inches of precipitation, nearly 3 times normal, roughly 38 inches of snow, nearly 3 times normal. Yesterday was a record breaking 19.6 official inches of snow, for another record breaking 3.39 inches of water.

NOUS45 KFGZ 221629
 PNSFGZ

 PUBLIC INFORMATION STATEMENT
 NATIONAL WEATHER SERVICE FLAGSTAFF AZ
 925 AM MST FRI JAN 22 2010

 ...A MASSIVE STORM SYSTEM BROUGHT NEAR RECORD RAIN...SNOW...AND
 FLOODING TO MUCH OF NORTHERN ARIZONA WEDNESDAY NIGHT THROUGH
 FRIDAY...

 A VERY SEVERE WINTER STORM MOVED INTO NORTHERN ARIZONA
 WEDNESDAY NIGHT AND CONTINUED THROUGH FRIDAY. THIS STORM FOLLOWED
 DIRECTLY AFTER TWO OTHER STRONG WINTER STORMS EARLIER IN THE WORK
 WEEK.

 HEAVY SNOW BEGAN WEDNESDAY EVENING OVER THE MOGOLLON RIM AND AT
 UNUSUALLY LOW ELEVATIONS SOUTH OF THE MOGOLLON RIM IN YAVAPAI AND
 GILA COUNTIES.

 SNOW LEVELS ROSE RAPIDLY THURSDAY AFTERNOON TO ABOVE 7000 FEET.
 DURING THIS TIME PERIOD...WIDESPREAD RAIN DEVELOPED FROM THE
 MOGOLLON RIM SOUTHWARD AND PRODUCED SEVERE FLOODING A FEW LOCATIONS.

 A POWERFUL COLD FRONT SWEPT ACROSS THE STATE THURSDAY
 NIGHT...LOWERING SNOW LEVELS BACK DOWN TO 4000 TO 4500 FEET. VERY
 STRONG WINDS OCCURRED WITH THE COLD FRONT CAUSING CONSIDERABLE
 BLOWING AND DRIFTING OF SNOW...AND COMPLICATING THE DIRECT
 MEASUREMENT OF SNOWFALL.

 BELOW ARE SOME RAIN...SNOW...AND WIND REPORTS FROM THIS STORM.

 WE ARE CONTINUING TO COLLECT SNOW AND RAIN TOTALS...AN UPDATED LIST
 WILL BE SENT SHORTLY. OVER MUCH OF THE HIGHER TERRAIN OF THE
 MOGOLLON RIM...CONSIDERABLE SNOW FELL ON THURSDAY FOLLOWED BY A
 PERIOD OF MODERATE RAIN DURING THE AFTERNOON. RAIN CHANGED BACK TO
 SNOW LATE IN THE EVENING WITH CONSIDERABLE BLOWING AND DRIFTING.

 FLAGSTAFF AREA SNOW REPORTS...SINCE WEDNESDAY NIGHT:

 DONEY PARK (EAST FLAG)    30 TO 35 INCHES (9 AM MST)
 BELLEMONT NWS OFFICE      27 INCHES (5 AM MST)
 FLAGSTAFF AIRPORT         28 INCHES (5 AM MST)
 FLAGSTAFF AREA SPOTTERS   25 TO 35 INCHES (9 AM MST)
 12 MILES N. PARKS         28 INCHES (7 AM MST)

 REPORTS FROM THURSDAY EVENING THROUGH FRIDAY MORNING:

 MCNARY 2N                 17 INCHES (7 AM MST)
 JACOB LAKE                12 TO 16 INCHES (9 AM MST)
 SHOW LOW                  15 INCHES (7 AM MST)
 HEBER                     12 TO 13 INCHES (9 AM MST)
 FLAGSTAFF AREA            10 TO 12 INCHES (8 AM MST)
 MUNDS PARK                9 INCHES (7 AM MST)
 CHINO VALLEY              6.5 INCHES (7 AM MST)
 CONCHO                    6 INCHES (7 AM MST)
 PAYSON                    3.0 TO 5.5 INCHES (7 AM MST)
 WEST PRESCOTT             4 INCHES (9 AM MST)
 BLACK MESA (WHITEGRASS)   3 INCHES (9 AM MST)

 STORM SYSTEM TOTALS SINCE MONDAY EVENING ON THE WESTERN MOGOLLON RIM
 CURRENTLY RANGE FROM 40 TO 60 INCHES. 

 STORM PRECIPITATION (RAIN OR MELTED SNOW) SINCE WEDNESDAY TOTALS:

 WET BOTTOM CREEK NEAR CHILDS 10.03 INCHES (500 AM MST)
 CHERRY CREEK NEAR GLOBE       8.06 INCHES (500 AM MST)
 CROWN KING                    7.63 INCHES (500 AM MST)
 SUNSET POINT                  7.61 INCHES (500 AM MST)
 TONTO CREEK FISH HATCHERY     6.01 INCHES (500 AM MST)
 OAK CREEK CANYON              5.62 INCHES (500 AM MST)
 PLEASANT VALLEY               4.17 INCHES (500 AM MST)
 SEDONA AIRPORT                4.11 INCHES (500 AM MST)
 PAYSON                        4.03 TO 5.3 INCHES (500 AM MST)
 MUNDS PARK                    3.70 INCHES (900 AM MST)
 BAGDAD                        3.50 INCHES (500 AM MST)
 HAPPY JACK                    3.59 TO 4.1 INCHES (500 AM MST)
 IRON SPRINGS                  3.31 INCHES (500 AM MST)
 FLAGSTAFF AIRPORT             2.89 INCHES (500 AM MST)
 MORMON LAKE                   2.41 INCHES (500 AM MST)
 SKULL VALLEY                  2.35 INCHES (500 AM MST)
 PRESCOTT                      2.27 INCHES (500 AM MST)
 WINDOW ROCK                   1.98 INCHES (500 AM MST)
 WINSLOW                       1.34 INCHES (500 AM MST)
 PAGE                          0.88 INCHES (500 AM MST)

The assumptions have to change. At this point, yesterday’s trivia question is invalid. The flight was cancelled and replaced. The current assumption is that the driver will leave at 5pm from Phoenix, Sky Harbor Airport.

Things have calmed down this morning, but there is an on-going chance for more snow. Hopefully, just a few inches will fall so people can catch up. I’ll try to post a picture of radar estimated precipitation later this morning.

I seriously doubt it. One set of model runs on Thursday made it appear that all the precipitation was going to be to the south of Flagstaff. Not this morning.

48 hour precipitation total - NAM Model - Climate Prediction Center

48 hour precipitation total - NAM Model - Climate Prediction Center

I still think those deeper yellows and oranges are to the south, but, maybe not. Here are some numbers from various sources:

Accuweather.com            32.9 inches
Intellicast.com            13-20 inches
Wunderground.com           28-48 inches (with more hevy snow overnight Friday night - Saturday morning)
NOAA Graphical            ~31.6 inches
National Weather Service   25-41 inches

There is a chance for a break from snow to rain this afternoon or evening.

No matter how you slice it, there is going to be a lot of snow. It could be very heavy and wet. Please, take care and be safe.

Here is a trivia question. If someone leaves the Phoenix airport at 2pm on Friday, January 22, 2010 at 2pm, how long will it be until the arrive at the Pulliam Airport exit in Flagstaff? Assume the driver have 15 years experience driving in Arizona and is driving a red Jeep Wrangler.

Here is the WINTER STORM WARNING from the National Weather Service. Keep in mind they have been as close to perfect on their forecasts this winter

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
433 AM MST THU JAN 21 2010

AZZ015-211945-
/O.EXT.KFGZ.WS.W.0002.000000T0000Z-100123T1900Z/
WESTERN MOGOLLON RIM-
INCLUDING THE CITY OF...FLAGSTAFF
433 AM MST THU JAN 21 2010

...WINTER STORM WARNING NOW IN EFFECT UNTIL NOON MST SATURDAY
ABOVE 6500 FEET...

THE WINTER STORM WARNING IS NOW IN EFFECT UNTIL NOON MST
SATURDAY.

* TIMING: SNOW WILL CONTINUE...HEAVY AT TIMES...THROUGH AT LEAST
  FRIDAY EVENING. PRECIPITATION WILL BECOME MORE SHOWERY BY
  SATURDAY.

* SNOW LEVELS: SNOW LEVELS WILL SLOWLY RISE TO AROUND 7000 FEET BY
  LATE THIS AFTERNOON. RAIN MAY MIX WITH SNOW BELOW 7500 FEET IN
  THE EVENING...SNOW LEVELS WILL THEN FALL RAPIDLY BY LATE
  THURSDAY EVENING.

* SNOW ACCUMULATIONS: EXPECT 2 TO 4 FEET OF SNOW BY SATURDAY ABOVE
  6500 FEET...WITH 3 TO 5 FEET ABOVE 7000 FEET.

* OTHER IMPACTS: STRONG WINDS TONIGHT WILL BRING NEAR BLIZZARD
  CONDITIONS WITH WHITE-OUT VISIBILITIES AND DAMAGING WINDS
  POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING...DUE TO SIGNIFICANT AMOUNTS OF SNOW AND
STRONG WINDS PRODUCING LIMITED VISIBILITIES.

DRIVING WILL BE EXTREMELY DANGEROUS DURING THIS STORM. IF
POSSIBLE...POSTPONE TRAVELING IN THE WARNING AREA UNTIL THIS
STORM PASSES.

IF YOU MUST TRAVEL TAKE EMERGENCY SUPPLIES THAT INCLUDE WINTER
CLOTHING...FOOD...WATER AND A FLASHLIGHT. FOR THE LATEST ROAD
CONDITIONS AND CLOSURES...CALL THE ADOT FREEWAY MANAGEMENT SYSTEM
AT 1 888 411 7623 OR VISIT THEIR WEB SITE AT WWW.AZ511.COM.
ADDITIONAL WEATHER INFORMATION IS ON THE WEB AT
WWW.WEATHER.GOV/FLAGSTAFF.

Where to begin today? I will probably make a couple posts today.

The Main Event is still on track for tomorrow. The biggest worry seems to be around the possibility of some rain in the middle of the heavy snow.

First, earlier this week, I asked the Kachina Peaks Avalanche Center if they could provide a comment on avalanche concerns after such a heavy snow this week. They have some great education materials on their site. They put me in touch with the Search and Rescue Unit at the Coconino County Sheriff’s Office. Here is a link to their statement about avalanche hazards that they released on Tuesday:

Avalanche Hazard January 19, 2010

If you go into the back country, or if you are just curious, take look.

3-4 Inches of water is on tap for Flagstaff for Thursday and Friday. How is comes is tricky. A band of warm air is going to try to move through on Thursday afternoon-evening. Still, I think we are looking at 3-4 feet of snow for Friday. More on this tonight and tomorrow morning.

Hopefully, the weekend will allow for a good dig-out. I’ve got my snow rake ready to go for my roof. Again, please let me know about your snow reports.

Here’s how it shapes up:

Tonight            Heavy Snow
Tuesday            Snow
Tuesday Night      Heavy Snow
Wednesday          Heavy Snow
Wednesday Night    Heavy Snow

The National Weather Service defines heavy snow as:

  • snowfall accumulating to 4″ or more in depth in 12 hours or less; or
  • snowfall accumulating to 6″ or more in depth in 24 hours or less

That’s a lot of snow for that many days. I don’t know how they will define Thursday and Friday. Maybe Monster Snow. Here is the GFS model from the Navy’s NOGAPS site. They use reds and yellows to show heavy amounts. Isn’t it pretty?

GFS Precipitation Model from US Navu NOGAPS site. For Thursday night to Friday morning.

GFS Precipitation Model from US Navu NOGAPS site. For Thursday night to Friday morning.

That is the 12 hours ending Friday morning about 5am. The 12 hours before and after are just as pretty. If it comes as snow, we are looking at 2 feet in less than 24 hours.

I hope you are ready. Here is a great mesage from the Coconino County: Prepare for Extended Snow

Please, let me (stu-in-flag@stu-in-flag.net) and the National Weather Service hear your snow reports.

The National Weather Service in Flagstaff needs your snow reports. Here is a pdf that tells you how to report:

snowreports.pdf (mirrored on my site)

snowreports.pdf (on the NWS site)

In case you missed it: WINTER STORM WATCH from the National Weather Service. It will probably be upgraded to a warning.

SEE UPDATE AT BOTTOM OF POST:

Here is a look at the GFS precipitation model through midday Tuesday.

Precipitation through midday Tuesday - GFS Model

Precipitation through midday Tuesday - GFS Model

Flagstaff looks to be in the 1 – 1.5 inch range here. Using the rough estimate of 1 inch of water equals 10 inches of snow, this would be 10-15 inches.

Here is the same graph for the NAM Model.

Precipitation through midday Tuesday - NAM Model

Precipitation through midday Tuesday - NAM Model

This seems to have Flagstaff in the 0.75-1.0 inch range, or 8-10 inches of snow. Keep in mind that heavy wet snow and light dry snow will have different volumes. In either case, this is a fairly good sized storm.

The real story is that it doesn’t stop there. Tuesday night and Wednesday night are going to be similar to Monday night. Thursday holds a little shift to the game. The storm that hits then will be warmer when it starts. We could see rain up to 8000 feet for the start of the storm before snow levels drop. This last storm could bring several inches of water. What a mess that will be.

The Shark Oil Barometer was still clear at noon today. Bet it won’t be tomorrow at noon.

The National Weather Service in Flagstaff needs your snow reports. Here is a pdf that tells you how to report:

snowreports.pdf (mirrored on my site)

snowreports.pdf (on the NWS site)

UPDATE Monday, January 18 from the National Weather Service:

FOR THE MOUNTAIN LOCATIONS (ON THURSDAY AND FRIDAY)
YAVAPAI COUNTY MOUNTAINS...MOGOLLON RIM AND WHITE MOUNTAINS...IF
SCENARIO ONE (WARM AND WET)...THEN THERE WOULD BE THE POSSIBILITY OF
1 TO 3 FEET OF WET HEAVY SNOW...SCENARIO TWO (COLDER AND WET) THEN
THERE WOULD BE THE POSSIBILITY OF 2 TO 5 FEET OF SNOW.
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