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September 2013 Observations And Discussions


sutherlandfan

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The roller coaster continues this weekend into early next week but should be followed by more sustained warmth for a period (9/18 - 9/22) a a strong trough digs into the west with ridging into the east.  Latest guidance has the next potential late season heat on/around 9/19....

 

test8.gif

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Now that's a lot more fall like, too bad it's unlikely we'll see -15 or lower departures. A -10 is considered a huge achievement with cool outbreaks while warm departures of +10 and higher are much more common and not unusual.

 

It'll be an achievement if urban/coastal areas stay in the 60s Saturday or have any overnight lows in the 40s. Both seem unlikely.

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Friday through at least Tuesday temps will average around 7-10 or more below normal EACH day. Some days it may not even touch 70.

I don't think next weeks "potential warmth" will negate much of this upcoming cool stretch.

It might not be as warm as you might be thinking or wishing later next week. We shall see.

 

 

my forecasted highs are 72 and 73 Sun-Tues with upper 40s for lows. my daily avg is 77/55 for that time period...that's 5-6 maybe 7 tops below normal. Meanwhile we racked up impressive departures today and sizable departures yesterday and tomorrow. Highs will push upward next week all the while the averages fall back to 76/53 by the 21st. It will only take an 81/60 for a couple of days to negate much of the cooldown and then you still have large departures to deal with. The last week in September would have to get really cool

 

anyho...last week I was laughing at people saying fall when temps were in the mid 70s...now if we had a 16 degree high temperature departure with temps in the mid 60s..then I would give it to you, that's fall

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The roller coaster continues this weekend into early next week but should be followed by more sustained warmth for a period (9/18 - 9/22) a a strong trough digs into the west with ridging into the east.  Latest guidance has the next potential late season heat on/around 9/19....

 

test8.gif

Right on schedule for the tropical mess that develops east of Florida in about ten days.

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How about this:

 

003 

WGUS75 KBOU 120757
FFSBOU
 
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
157 AM MDT THU SEP 12 2013
 
COC013-059-121015-
/O.CON.KBOU.FF.W.0034.000000T0000Z-130912T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON CO-BOULDER CO-
157 AM MDT THU SEP 12 2013
 
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM MDT FOR
NORTHERN JEFFERSON AND BOULDER COUNTIES...
 
...THIS IS A FLASH FLOOD EMERGENCY FOR BOULDER COUNTY...
 
AT 150 AM MDT...EMERGENCY MANAGEMENT REPORTED COLLAPSED HOUSES NEAR 
JAMESTOWN. MAJOR FLOODING IS OCCURRING ON SOUTH SAINT VRAIN CREEK IN 
NORTHERN BOULDER COUNTY. THERE IS MODERATE TO MAJOR FLOODING IN THE 
FOURMILE BURN AREA WEST OF THE CITY OF BOULDER. THERE IS MODERATE 
FLOODING ON BOULDER CREEK THROUGH THE CITY OF BOULDER AND IN 
LEFTHAND CANYON. MINOR FLOODING IS FORECAST OR OCCURRING ON SAINT 
VRAIN CREEK THROUGH LYONS. MINOR FLOODING HAS BEEN OCCURRING ON 
SOUTH BOULDER CREEK IN SOUTHERN BOULDER COUNTY.
 
SOME LOCATIONS EXPERIENCING FLOODING INCLUDE... NORTHWESTERN 
ARVADA...WESTERN WESTMINSTER...BOULDER...WESTERN 
BROOMFIELD...LAFAYETTE...LOUISVILLE...ERIE...SUPERIOR...LYONS... 
JAMESTOWN...SALINA...ELDORADO SPRINGS...CRISMAN...GOLD HILL... 
NIWOT...SUMMERVILLE...PEACEFUL VALLEY...ALLENSPARK...WALLSTREET... 
ROCKY FLATS...RAYMOND...MEEKER PARK...SUNSHINE AND WHITE RANCH OPEN 
SPACE.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...
 
MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE
THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE
FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER.
 
THIS IS A LIFE THREATENING SITUATION FOR PEOPLE ALONG BOULDER CREEK
IN THE CITY OF BOULDER...IN THE FOURMILE BURN AREA...AND IN BOULDER
CANYON.  HEAVY RAINFALL WILL CAUSE EXTENSIVE AND SEVERE FLASH
FLOODING OF CREEKS AND STREAMS FROM THE FOURMILE BURN AREA DOWNSTREAM
THROUGH THE CITY OF BOULDER.  SOME DRAINAGE BASINS IMPACTED INCLUDE
BOULDER CREEK...FOURMILE CREEK...GOLD RUN...FOURMILE CANYON CREEK...
AND WONDERLAND CREEK.  SEVERE DEBRIS FLOWS CAN ALSO BE ANTICIPATED
ACROSS ROADS.  ROADWAYS AND BRIDGES MAY BE WASHED AWAY IN PLACES.  IF
YOU ENCOUNTER FLOOD WATERS...CLIMB TO SAFETY.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
 
&&
 
LAT...LON 4011 10515 4010 10505 3996 10505 3994 10511
      3995 10513 3993 10515 3991 10510 3985 10509
      3978 10521 3977 10540 3992 10539 3994 10545
      4026 10555 4026 10524
 
$$
TLH
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Now that's a lot more fall like, too bad it's unlikely we'll see -15 or lower departures. A -10 is considered a huge achievement with cool outbreaks while warm departures of +10 and higher are much more common and not unusual.

It will be in the 60's on Saturday.

It was in the upper 60's during early afternoon back in late July with no rain just clouds.

Some in the east that were 10-20 above will be 10-20 below this weekend.

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my forecasted highs are 72 and 73 Sun-Tues with upper 40s for lows. my daily avg is 77/55 for that time period...that's 5-6 maybe 7 tops below normal. Meanwhile we racked up impressive departures today and sizable departures yesterday and tomorrow. Highs will push upward next week all the while the averages fall back to 76/53 by the 21st. It will only take an 81/60 for a couple of days to negate much of the cooldown and then you still have large departures to deal with. The last week in September would have to get really cool

anyho...last week I was laughing at people saying fall when temps were in the mid 70s...now if we had a 16 degree high temperature departure with temps in the mid 60s..then I would give it to you, that's fall

Some of those highs may come down a bit. But what's your forecasted high for Saturday?

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Instability looks decent for early in day. But shear is weak. Best shear and forcing for severe t-storms this afternoon, will be NW of NYC

 

15frnf4.jpg

 

New outlook at 13z expands the slight risk SE into NYC:

day1probotlk_1300_wind.gif

...NRN MID ATLANTIC/NEW ENGLAND TODAY INTO TNGT...
  RICH MOISTURE WILL REMAIN IN PLACE ALONG/AHEAD OF COLD FRONTS
   APPROACHING THE NERN STATES TODAY. THIS WILL CONTRIBUTE TO
   DIURNALLY-ENHANCED BUOYANCY ACROSS THE REGION. MID-LVL LAPSE RATES
   WILL...HOWEVER...BE WEAKER THAN THE PAST TWO DAYS AS RESIDUAL EML
   HAS MOVED OFFSHORE AND 700-500 MB FLOW SLIGHTLY BACKS AHEAD OF
   AMPLIFYING TROUGH. NEVERTHELESS...WITH EVEN MODEST SFC
   HEATING...AMPLE INSTABILITY SHOULD BE PRESENT TO SUPPORT STRONG
   UPDRAFTS. DESTABILIZATION SHOULD BE GREATEST ALONG LEE TROUGH FROM
   ERN MD NEWD INTO CNTRL NEW ENGLAND...WHERE MLCAPE MAY REACH 2000
   J/KG.

   WIND PROFILES ACROSS THE SLGT RISK REGION WILL BE CHARACTERIZED BY
   MODERATE...LARGELY UNIDIRECTIONAL WSWLY FLOW...WITH 700-500 MB WIND
   SPEEDS INCREASING FROM AROUND 30 KTS NEAR THE MD-PA BORDER TO ABOUT
   50 KTS IN ME. SETUP THEREFORE APPEARS FAVORABLE FOR
   ORGANIZED/SUSTAINED STORMS...ESPECIALLY FROM N OF NYC INTO NEW
   ENGLAND...WHERE A FEW SUPERCELLS MAY OCCUR.

   GIVEN 30-40 KT LLJ...DMGG WIND GUSTS...MARGINALLY SVR HAIL...AND
   POSSIBLY A TORNADO APPEAR MOST PROBABLE THIS AFTN OVER THOSE PARTS
   OF NEW ENGLAND THAT EXPERIENCE THE GREATEST HEATING AND ARE REMOVED
   FROM THE STABILIZING INFLUENCE OF LOW-LVL ONSHORE FLOW. LOCALLY DMGG
   GUSTS SHOULD BE THE MAIN HAZARD FARTHER S/SW INTO PA/MD. WHILE THE
   SVR THREAT SHOULD END BY EVE OVER MOST OF NEW ENGLAND...ISOLD SVR
   ACTIVITY MAY PERSIST INTO EARLY TNGT OVER THE MID ATLANTIC AS
   ADDITIONAL STORMS FORM ALONG STRENGTHENING COLD FRONT ADVANCING E
   FROM THE OH VLY.

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No real changes on the overnight guidance for the upcoming week to 10 days. The cooldown 9/13 - 9/17 is followed by an overall  warmer pattern 9/18 - 9/22 with higher heights into the east and a trough into the west coast.  The peak of the cooldown will be fri night and sat (9/13-14) with a chance for more late season heat 9/19-20.   

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Quick scan of NYC's progged temps over the next several days would yield about a -40 departure through Wed. After including today's positive departure, NYC should be right around 0 / normal by this coming Wednesday. The last 10 days will determine how far above normal we finish. Looks like back and forth biased warm right now.

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BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE MOUNT HOLLY NJ

1135 AM EDT THU SEP 12 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

NORTHEASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

SOUTHERN MORRIS COUNTY IN NORTHERN NEW JERSEY...

NORTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 1230 PM EDT

* AT 1133 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM. THE STORM WAS NEAR WHITE HOUSE STATION...

MOVING EAST AT 25 MPH. THIS STORM IS CAPABLE OF PRODUCING ONE INCH

DIAMETER HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

SOMERVILLE AROUND 1145 AM EDT...

FAR HILLS AND MARTINSVILLE AROUND 1150 AM EDT...

MENDHAM AROUND 1155 AM EDT...

MILLINGTON AND BASKING RIDGE AROUND NOON EDT...

MORRISTOWN AROUND 1210 PM EDT...

MADISON AROUND 1215 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE

INCH OR LARGER.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE

THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU

CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

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