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July 15-20 Severe Weather


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Going by some of the hi res guidance and spc day 1, you have to feel pretty confident about an MCS traveling from southern Minnesota down towards Chicago.

The NAM has been consistently less intense than the GFS for the last couple days, although it gives ORD an MCS early tomorrow morning by the looks of it. It also shows no convection forming tomorrow night, so all the parameters would likely go to waste, and we'd heat up to our fullest potential.

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The NAM has been consistently less intense than the GFS for the last couple days, although it gives ORD an MCS early tomorrow morning by the looks of it. It also shows no convection forming tomorrow night, so all the parameters would likely go to waste, and we'd heat up to our fullest potential.

I wouldn't worry about the NAM too much, in fact i wouldn't worry about it at all.

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I wouldn't worry about the NAM too much, in fact i wouldn't worry about it at all.

I'm of the same opinion, but I've seen many times where the models have indicated some MCS action this summer within a day or two that never came to fruition. Therefore, I'm not as optimistic as you seem to be.

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I'm of the same opinion, but I've seen many times where the models have indicated some MCS action this summer within a day or two that never came to fruition. Therefore, I'm not as optimistic as you seem to be.

Good chance i get smoked and you get screw holed, so it's probably best to curtail expectations. And lol at using models to pin point MCS activity 2 days out.

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Good chance i get smoked and you get screw holed, so it's probably best to curtail expectations. And lol at using models to pin point MCS activity 2 days out.

What else can you use? Btw, I don't think one or the other of us is more or less likely to see the action. The NAM showed the MCS hitting Chicago, but the GFS has been showing most of Wisconsin getting copious MCS action, so it's still out on the table.

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I'm of the same opinion, but I've seen many times where the models have indicated some MCS action this summer within a day or two that never came to fruition. Therefore, I'm not as optimistic as you seem to be.

Chicago has made the most of their chances this yr it seems.. If Tony and Alek are honking I'm betting something goes down.. I'm just hoping for another July 11th and a inch of rain with destruction crapping out as usual in my location.

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Chicago has made the most of their chances this yr it seems.. If Tony and Alek are honking I'm betting something goes down.. I'm just hoping for another July 11th and a inch of rain with destruction crapping out as usual in my location.

Tony was big on the potential for tomorrow night, which is obviously still there if we get the favorable forcing and surface features at the heat of the day. Who knows at this point?

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Tony was big on the potential for tomorrow night, which is obviously still there if we get the favorable forcing and surface features at the heat of the day. Who knows at this point?

Sweet.. we're going to get smashed twice at least.

I'm more worried about suckville stealing my garden rain over ORD.

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Sweet.. we're going to get smashed twice at least.

I'm more worried about suckville stealing my garden rain over ORD.

Yeah, Suckville has stolen some rain in the last month or two. I don't think Cro will be too happy about missing out on a potential 90 degree day due to convection, though.

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Yeah, Suckville has stolen some rain in the last month or two. I don't think Cro will be too happy about missing out on a potential 90 degree day due to convection, though.

Yeah and his banana plants would take a beating :devilsmiley:

His tropical paradise is really looking amazing tho.. surprised he hasn't posted any pics.

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Sweet.. we're going to get smashed twice at least.

I'm more worried about suckville stealing my garden rain over ORD.

To early to tell for sure about tomorrow, but it is looking like Cromartie gets the rain this evening. I'm betting both Milwaukee and Chicago miss the good stuff with the better dynamics heading east (to your north) and some more rounding the bend of the upper ridge and missing you to the southwest. I'm liking your chances better than Aleking's though.

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This could be one mean derecho considering the copious amounts of CAPE.

Here's the meso disc. for that upgrade.

mcd1639.gif

MESOSCALE DISCUSSION 1639

NWS STORM PREDICTION CENTER NORMAN OK

1024 AM CDT SUN JUL 17 2011

AREAS AFFECTED...PARTS OF ERN ND...NW MN

CONCERNING...OUTLOOK UPGRADE

VALID 171524Z - 171630Z

GIVEN THE PRESENCE OF STRONG TO EXTREME POTENTIAL INSTABILITY... AND

MODEST TO STRONG DEEP LAYER VERTICAL SHEAR...PROBABILITIES FOR THE

EVOLUTION OF AN ORGANIZED SEVERE MESOSCALE CONVECTIVE SYSTEM APPEAR

TO BE INCREASING...EITHER FROM ONGOING ACTIVITY OR NEW DEVELOPMENT

LATER THIS AFTERNOON. THIS WILL BE REFLECTED IN A CATEGORICAL

UPGRADE TO A MODERATE RISK FOR SEVERE STORMS ACROSS PARTS OF EASTERN

NORTH DAKOTA AND NORTHWEST MINNESOTA IN THE 1630Z OUTLOOK UPDATE.

..KERR.. 07/17/2011

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To early to tell for sure about tomorrow, but it is looking like Cromartie gets the rain this evening. I'm betting both Milwaukee and Chicago miss the good stuff with the better dynamics heading east (to your north) and some more rounding the bend of the upper ridge and missing you to the southwest. I'm liking your chances better than Aleking's though.

Pretty much my worries also... Just hopping for the alek south trend a bit but then it would probably go to far south and hit that lucky bastard.

To be honest tho I hope I do get missed south or any direction. I want as close to a zero percent chance of losing my power.

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Have you been over to his house?

Nope.. He just sends pictures like it's their newborn baby.. Haven't been up there yet but i offered to trim and chainsaw his stuff down in the fall. I do have to get up there tho.. check out his motorized mountain bike so he can now keep up with the wife and kid.. lol I want one.

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Pretty much my worries also... Just hopping for the alex south trend but then it would probably go to far south and hit that lucky bastard.

To be honest tho I hope I do get missed south.. I want as close to a zero percent chance of losing my power.

Parents finally had power restored on Friday morning around 5:30 a.m. to make it just shy of a 96 hour outage for them (on well and septic). All in all they made out okay. My fridge/freezer certainly became more than a bit full after we were unable to get a generator hooked up to their goods. I believe there may still be some very small pockets around here without power.

Pretty incredible to consider that 850k+ customers were out in northeastern IL after last Monday. Wonder if a hypothetical identical storm a week later after their repairs/new lines,poles, etc. would yield the same power losses. I think that would be a tough storm to match, but perhaps we'll find out.

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To early to tell for sure about tomorrow, but it is looking like Cromartie gets the rain this evening. I'm betting both Milwaukee and Chicago miss the good stuff with the better dynamics heading east (to your north) and some more rounding the bend of the upper ridge and missing you to the southwest. I'm liking your chances better than Aleking's though.

Once you get far enough downstream the mid levels look favorable for a pretty hard right turn and some of the previous hi-res guidance was showing turns hard enough to miss me to the west. Never safe to be too confident with MCS paths, but I like the potential and won't be shocked to see whatever forms this evening be moving nearly due south by dawn tomorrow. Check the propogation vectors.

prop.gif?1310919663223

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nice tornado warned SUP in ND at this time also

415

ACUS01 KWNS 171631

SWODY1

SPC AC 171629

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

1129 AM CDT SUN JUL 17 2011

VALID 171630Z - 181200Z

...THERE IS A MDT RISK OF SVR TSTMS THIS AFTERNOON FOR ERN ND AND NW

MN...

...THERE IS A SLGT RISK OF SVR TSTMS THROUGH TONIGHT FOR THE NRN

PLAINS/UPPER MS VALLEY/UPPER GREAT LAKES...

...THERE IS A SLGT RISK OF SVR TSTMS TONIGHT FOR NRN NEW

ENGLAND/NY...

..NRN PLAINS/UPPER MS VALLEY THROUGH TONIGHT

A REMNANT CLUSTER OF STORMS FROM EARLY THIS MORNING HAS RECENTLY

SHOWN SIGNS OF INTENSIFICATION NEAR MINOT ND. THIS CLUSTER IS

ASSOCIATED WITH A SHORTWAVE TROUGH MOVING ACROSS NE MT/NW

ND...AROUND THE NW PERIPHERY OF THE CENTRAL PLAINS MIDLEVEL HIGH.

AT THE SURFACE...A REMNANT BOUNDARY PERSISTS FROM CENTRAL/ERN ND

INTO NRN MN...WHILE A REINFORCING FRONTAL SURGE IS MOVING SEWD INTO

NE ND/NW MN IN ASSOCIATION WITH A SEPARATE SHORTWAVE TROUGH

APPROACHING NW ONTARIO. VERY RICH MOISTURE /BOUNDARY LAYER

DEWPOINTS OF 75-80 F/ IS PRESENT ALONG AND S OF THIS

BOUNDARY...WHERE ADDITIONAL DAYTIME HEATING WILL COMBINE WITH STEEP

MIDLEVEL LAPSE RATES TO RESULT IN EXTREME INSTABILITY THIS AFTERNOON

/MLCAPE OF 5000-6000 J PER KG/ AND A WEAKENING CAP.

THE THERMODYNAMIC ENVIRONMENT SUPPORTS INTENSIFICATION OF THE

ONGOING STORMS IN ND...WITH THE EXTREME INSTABILITY AND 50+ KT

EFFECTIVE BULK SHEAR FAVORABLE FOR EMBEDDED SUPERCELLS WITH VERY

LARGE HAIL. UPSCALE GROWTH OF THE CLUSTER APPEARS PROBABLE INTO THE

AFTERNOON...WHEN COLD POOL DEVELOPMENT AND FORWARD PROPAGATION ALONG

THE SURFACE BOUNDARY COULD LEAD TO BOW ECHO FORMATION WITH AN

ATTENDANT RISK FOR WIDESPREAD/SIGNIFICANT WIND DAMAGE. THERE WILL

ALSO BE SOME RISK FOR TORNADOES WITH THE MORE DISCRETE SUPERCELLS IN

THE CLUSTER BY EARLY AFTERNOON...AS THE BOUNDARY LAYER DESTABILIZES

AND THE CONVECTION BECOMES SOLIDLY ROOTED AT THE SURFACE. IF THE

SCENARIO EVOLVES AS EXPECTED INTO THE AFTERNOON...THE MDT RISK AREA

MAY NEED TO BE EXPANDED FARTHER SE INTO MORE OF MN...AND POSSIBLY

EVEN NW WI FOR LATE THIS AFTERNOON/EVENING.

..NRN MT THROUGH EARLY TONIGHT

LOW-LEVEL MOISTURE LINGERS ACROSS MT IN THE POST-FRONTAL

ENVIRONMENT...WITH THE RICHER MOISTURE CONFINED TO E/SE MT IN A WEAK

NELY UPSLOPE REGIME. ALOFT...GRADUAL WARMING AND HEIGHT RISES ARE

EXPECTED OVER MT TODAY AS THE CENTRAL PLAINS UPPER HIGH

EXPANDS...AND THERE ARE NO CLEAR EMBEDDED SPEED MAXIMA TO ENHANCE

THUNDERSTORM DEVELOPMENT IN THE WAKE OF THE SPEED MAX EXITING NE MT.

STILL...IF STORMS DO FORM ACROSS NE MT NEAR THE INSTABILITY

AXIS...OR ACROSS NW MT INVOF THE HIGHER TERRAIN...THERE WILL BE A

RISK FOR SUPERCELLS WITH ISOLATED LARGE HAIL/DAMAGING WINDS.

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Doesn't this seem eerily similar to exactly a week ago? Same potential location, same timing, MSP looks to get hit again, with the potential for MKE and ORD to get in on the action early tomorrow morning.

I also agree--plus we're still stuck in the heat dome in downstate Illinois (as with the rest of the Midwest too) like we were early last week with little to no hope of getting in on some of the rain here. And the slight risk for tomorrow has just been pulled away from the I-74 corridor (Peoria, Bloomington, Champaign) for now.

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