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by wxteam4 from Kansas City, MO.

Last Post 5 hours Ago


Good Morning...did you know...as we wonder when we'll hit the 90 degree mark for the first time of the year...how many times LAST year we hit 90 degrees through June 30th? The answer coming up at the end of the blog...

We we had a few showers move through earlier this AM...rainfall amounts are rather skimpy...and many on the MO side had fewer drops, if any. So if you wake up in the mid AM hours...you probably didn't even know about the rain. There were a few rumbles of thunder and some slightly heavier t/showers well west of the metro...but that was about it...so where do we go from here for the rest of the day? An analysis of the surface data shows a light chaotic flow across the midwest...tough to make out exactly where the front is this AM...probably still lurking to our NW...latest RUC data is not too encouraging for more t/storms around these parts this afternoon...CAPES are meager at best and while we're uncapped...I'm not seeing much for a focusing mechanism for additional t/storm development...however with maybe a strange outflow lurking or perhaps the actual front around later this afternoon I'll keep that chance alive...probably down to 30% for later today...it's tough to find much if any convergence through any layer of the atmosphere...so the activity may be very spotty, if any at all...

From tomorrow on...just very muddled with the rain chances...I'll keep the chance of storms around on TUE...but in reality any weak little disturbance caught in  the flow can give us some moisture...early this week a "dirty" ridge is going to control the weather around here...now it's not what you think...this is when a ridge in the atmosphere has weak little ripples in it or moving through it...so we refer to it as "dirty." It's not like a typical summer time ridge which cleanly pokes up through the central plains to the northern plains (paint a mental image)...this one is messier...it want to be there...and certainly is farther west into the Rockies and the SW...but for us...we're still not there yet. Eventually the ridge will firm up a bit more on it's eastern side...and stretch somewhat into the plains states towards the end of the week...

The ridge though is anything but "dirty" out west...where there were quite a few record highs yesterday (broken or tied) including Phoenix at 115 (t) Yuma @ 116 (t), Imperial, CA @ 116 and Los Angeles @ 92 (LAX)...California by far had the most in terms of the numbers of record highs...and that ridge will persist there for the next few days...latest EURO data is not too optimistic about pushing any extreme heat our way...as a matter of fact...taken as gospel we stay in quasi NW flow through early July...however as we gradually dry out...we'll start pressing those highs closer and closer to 90 over the next 5-10 days (if not slightly above)...

While we've talked extensively about the flooding...there are several parts of the country that are insanely dry...one area in particular is a small area of the OK Panhandle/Extreme SW KS/SE CO...here is the latest from the folks who monitor the drought...it's rated as "exceptionally" dry there which is technically as bad as it gets concerning the "dryness". Data that I looked at this AM show good parts of the OK Panhandle 4-10" below average for the last 6 months...for an area that doesn't get that much to begin with...that's not good.

So that's about it...may have an update later this PM if weather warrants..Chris is still churning away at the numbers for his research project...if he finishes today we'll try to get something posted on his data this evening...but he's got excel sheets open all over and I have no clue how that stuff works...

The answer by the way to the question I posed at the beginning is exact 1 day with temps 90 or above through 6/30/2007 (June 15th)...we didn't start to sizzle till after 7/4 but man was it hot after that!

Joe
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wxteam4 read my blog view my photos
Jun 22, 2008 | 8:40 AM

The following was written by Mike Brennan, HPC SOO

Some WFO forecasters in central region have noticed rather large errors
in model forecast 2-m dewpoints over portions of the upper Midwest,
particularly in cases of westerly flow. This is due to the fact that the
corn crop is severely underdeveloped in southern Iowa and northern
Minnesota due to cool spring temperatures and the recent flooding.

This underdevelopment/non-existence of the corn means that the models
think the land surface is significantly "greener" than it is in reality.
Therefore the model thinks that vegetation is transpiring into the lower
atmosphere (corn especially is a *very* efficient transpire-er).

This *could* impact model forecasts in a few ways:

-erroneously high 2-m dewpoint temperatures

-a diminished diurnal temperature range in the models due to:

-model Tmax values that are too *low* (due to phantom latent heat flux
in the model from non-existent corn)

-model Tmin values that are too *high* due to excess moisture in the low
levels

-model forecast CAPE values that could be too *high*, since CAPE is very
sensitive to low-level moisture - this could also impact model
convective initiation

These impacts will likely continue for the short term, particularly
after the flood waters recede. There could also be a longer term impact
if the corn crop is unable to be replanted for this season.

Here are a couple of snippets from Bill Bua at COMET on the possible
effects, as well as some links to info on the impacts vegetative cover
on model forecasts.

"For the v

wxteam4 read my blog view my photos
Jun 22, 2008 | 8:41 AM

More...

"For the vegetation alone, late greenup (and smaller leaf area index
coverage than usual if the crop is late in growing) usually means less
evapotranspiration than the model is showing, so it's less likely we'll
be seeing any of those 80F dewpoints we can see in the high summer, at
least until the corn is replanted and can catch up. Now if they cannot
replant, and I've heard that they may not have enough time to get a crop
in, that'll have a more profound effect all summer long..."

wxteam4 read my blog view my photos
Jun 22, 2008 | 9:39 PM

Fascinating...

IN ADDITION...ALTHOUGH ISOLATED LIGHT SHOWERS AND THUNDERSTORMS
TRAVERSED THE CENTRAL SAN JOAQUIN VALLEY DURING THE AFTERNOON OF
JUNE 21ST...THEY STAYED NORTH OF THE FRESNO-YOSEMITE INTERNATIONAL
AIRPORT. AS A RESULT...JUNE 21ST REMAINS THE ONLY DATE THAT RAIN HAS
NOT FALLEN ON AN OFFICIAL RAIN GAGE IN FRESNO. THIS 131-YEAR PERIOD
OF RECORD INCLUDES RAIN GAGES OPERATED BY THE SOUTHERN PACIFIC
RAILROAD /COOPERATIVE OBSERVER 1878-1887/...THE U.S. ARMY SIGNAL
CORPS...THE U.S. WEATHER BUREAU AND THE NATIONAL WEATHER SERVICE.

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wxteam4

Mike Thompson, Don Harman, Karli Ritter and Joe Lauria make up the 4 Warn Weather Team at FOX 4. We've been blogging now for two years, as a matter of fact we were the first ever weather blog serving this region, and we're excited to continue to be able to get feedback from our viewers right here on our blog. Look here for extra information, trivia, and severe weather updates.

Member Since: 9/1/2006