Jump to content
  • Member Statistics

    17,606
    Total Members
    7,904
    Most Online
    ArlyDude
    Newest Member
    ArlyDude
    Joined

May 2012 General Discussion


Chicago Storm

Recommended Posts

  • Replies 1.2k
  • Created
  • Last Reply

MESOSCALE DISCUSSION 0817

NWS STORM PREDICTION CENTER NORMAN OK

0251 PM CDT TUE MAY 15 2012

AREAS AFFECTED...ERN IA / NRN IL / SRN WI

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 151951Z - 152045Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...ISOLD-WIDELY SCTD STORMS EXPECTED TO DEVELOP 21-00Z. SOME

RISK FOR GUSTY WINDS MAY DEVELOP WITH THE STRONGER STORMS. OVERALL

SEVERE THREAT WILL SEEMINGLY BE LIMITED BY QUALITY OF MOISTURE /LACK

THEREOF/...RENDERING THE PROBABILITY OF WATCH ISSUANCE LOWER THAN

PERCEIVED EARLIER. THE SLIGHT RISK WILL BE DOWNGRADED TO A SEE TEXT

HIGHLIGHT FOR THE UPCOMING 20Z CONVECTIVE OUTLOOK ISSUANCE.

DISCUSSION...VISIBLE SATELLITE IMAGERY SHOWS A CLUMPING CU FIELD

ALONG THE FRONT EXTENDING FROM 30 MI N DSM INTO NERN IA. STRONG

SURFACE HEATING AHEAD OF THE FRONT HAS YIELDED TEMPS IN THE

MID-UPPER 80S AND 40-50 DEG TEMP/DEWPOINT SPREADS. OF

NOTE...VARIOUS MORNING MODEL SOLUTIONS HAVE BEEN OVERLY AGGRESSIVE

REGARDING THE QUALITY OF BOUNDARY LAYER MOISTURE ACROSS THE AREA.

OBSERVED GPS PW/S IN FAR ERN IA NEAR THE IL BORDER AND OVER NERN IA

/0.4 TO 0.5 INCH --RESPECTIVELY/...ARE 0.25-0.5 INCH LOWER THAN

VARIOUS OPERATIONAL MODELS. AS SUCH...UPDRAFTS WILL SEEMINGLY BE

INHIBITED TO A DEGREE BY DRY AIR ENTRAINMENT...DESPITE FRONTAL

FORCING AIDING IN CONVECTIVE DEVELOPMENT. WITH ONLY WEAK

INSTABILITY /A FEW HUNDRED J/KG SBCAPE/...STORM COVERAGE WILL LIKELY

REMAIN ISOLD TO WIDELY SCTD...YIELDING PERHAPS A FEW STRONG WIND

GUSTS.

..SMITH/HART.. 05/15/2012

Link to comment
Share on other sites

One pretty good cell just west of Turtle's place!

Those are taking off nicely!!

Skilling also thinks a solid chunk of the area will see some storms this evening..

T-storms with tops to 32,000 ft & building flashing cloud/ground lightning SW & S Cen WI. Gusts to 45 mph rptd Mineral Pt WI wi these strms. Gusty storms-sev possibly svr headed for northern IL, reaching city in 7 to 10PM time range. Areal storm coverage: 40-50% of area.

http://twitter.com/#!/SKILLING

Link to comment
Share on other sites

Those are taking off nicely!!

Skilling also thinks a solid chunk of the area will see some storms this evening..

http://twitter.com/#!/SKILLING

Well these storms aren't working off dewpoints, that's for sure! Cell in S Dodge county looking pretty good. Couple micro cells nearer to Milwaukee.

SWS:

SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

440 PM CDT TUE MAY 15 2012

WIZ057-058-063-064-152230-

COLUMBIA-DANE-DODGE-JEFFERSON-

440 PM CDT TUE MAY 15 2012

...STRONG THUNDERSTORM MOVING INTO FAR SOUTHEAST COLUMBIA...FAR

NORTHEAST DANE...SOUTHWEST DODGE AND NORTHWEST JEFFERSON COUNTIES...

AT 436 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

STRONG THUNDERSTORM 13 MILES NORTHWEST OF WATERLOO...MOVING EAST AT

30 MPH.

ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY

DOWNPOURS...ARE POSSIBLE WITH THIS STORM.

* THE THUNDERSTORM WILL BE NEAR...

WATERLOO BY 500 PM CDT...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE

OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS

STORM HAS PASSED.

Link to comment
Share on other sites

MESOSCALE DISCUSSION 0820

NWS STORM PREDICTION CENTER NORMAN OK

0458 PM CDT TUE MAY 15 2012

AREAS AFFECTED...ECNTRL IA...NRN IL...SERN WI

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 152158Z - 152300Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...GUSTY WINDS MAY BE NOTED WITH STRONGER TSTM CORES THIS

EVENING FROM SRN WI...ACROSS NRN IL INTO SERN IA.

DISCUSSION...STRONG SUNSHINE HAS CONTRIBUTED TO VERY STEEP LAPSE

RATES AHEAD OF COLD FRONT FROM SERN IA INTO SRN WI. SFC

TEMPERATURES HAVE WARMED INTO THE MID-UPPER 80S ACROSS THIS REGION

BUT DEW POINTS HAVE DROPPED AS BOUNDARY LAYER HAS DEEPENED. MODEL

FORECAST DEW POINTS ACROSS THIS REGION ARE AT LEAST 10 DEG F TOO

HIGH BUT NEAR DRY ADIABATIC LAPSE RATES ARE CONTRIBUTING TO HIGH

BASED CONVECTION WITH BASES LIKELY NEAR 700 MB. ALTHOUGH

INSTABILITY IS FAIRLY WEAK...GIVEN THE DRY SUB-CLOUD LAYER IT WOULD

SEEM PLAUSIBLE THAT GUSTY WINDS MAY BE NOTED WITH STRONGER CORES.

AT THIS TIME IT APPEARS DOWNBURST WINDS SHOULD REMAIN MOSTLY

SUB-SEVERE AND A WATCH IS NOT ANTICIPATED.

..DARROW/CORFIDI.. 05/15/2012

RAP_255_2012051521_F01_42.5000N_88.5000W.png

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...