...SPECIAL WEATHER STATEMENT...
AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS ALONG A LINE EXTENDING FROM WADSWORTH TO WONDER
LAKE...MOVING SOUTHEAST AT 25 MPH.
WINDS GUSTING TO 50 MPH ARE POSSIBLE WITH SOME OF THESE STORMS.
CITIES AND TOWNS AFFECTED...
MCHENRY... LAKE VILLA... MCCULLOM LAKE...
SUNNYSIDE... PISTAKEE HIGHLANDS... FOX LAKE...
WONDER LAKE... ANTIOCH... LAKE CATHERINE...
OTHER LOCATIONS AFFECTED...
CHAIN O LAKES STATE PARK...COLLEGE OF LAKE COUNTY...GREAT LAKES NAVAL
TRAINING CENTER...IL BEACH STATE PARK...LAKE COUNTY FIELDERS
BASEBALL...LAKE COUNTY IL FAIRGROUNDS...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL
THESE STORMS HAVE PASSED.
&&
LAT...LON 4250 8790 4245 8779 4239 8780 4235 8782
4233 8782 4233 8781 4231 8781 4230 8782
4224 8782 4215 8809 4215 8813 4237 8841
4250 8812
TIME...MOT...LOC 0047Z 297DEG 20KT 4245 8794 4229 8844
John Jensen K9WXX of McHenry County Weather is an avid and passionate weather geek who post watches, warnings and advisories on our blog and Facebook
Established: 2013
Coverage Area:
McHenry County, IL
Sunday, September 1, 2013
Mesoscale Discussion 18:12:24.6488856
AREAS AFFECTED...WCNTRL THROUGH NERN IL AND EXTREME SERN WI
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 012311Z - 020115Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...A FEW STORMS MAY CONTINUE DEVELOPING FROM WCNTRL THROUGH
NERN IL AND EXTREME SERN WI INTO THE EARLY EVENING AND POSE A
MARGINAL THREAT FOR ISOLATED STRONG WIND GUSTS AND HAIL. WW ISSUANCE
IS UNLIKELY UNLESS CONVECTIVE TRENDS BEGIN TO SUGGEST DEVELOPMENT OF
A MORE ROBUST THREAT.
DISCUSSION...EARLY THIS EVENING A COLD FRONT EXTENDS FROM LAKE MI
SWWD THROUGH SERN WI...NWRN IL INTO NRN MO. CUMULUS HAS BEEN
INCREASING IN THE VICINITY OF THIS BOUNDARY...AND A FEW STORMS HAVE
DEVELOPED FROM NRN IL INTO SERN WI WHERE GLANCING INFLUENCE OF
ASCENT FROM THE SHORTWAVE TROUGH MOVING EWD THROUGH THE GREAT LAKES
MAY BE PRESENT. MULTILAYER CLOUDS FROM EARLIER TODAY WERE SLOW TO
DISSIPATE AND ALLOWED FOR ONLY PARTIAL RECOVERY OF THE BOUNDARY
LAYER. LATEST OBJECTIVE ANALYSIS INDICATES AROUND 1500-2000 J/KG
MLCAPE AND 6.5 C/KM MID-LEVEL LAPSE RATES WITH SFC TEMPERATURES
GENERALLY IN THE 80S. DEEP LAYER WLY SHEAR LESS THAN 30 KT EXISTS IN
WARMS SECTOR...AND WINDS HAVE SHIFTED WLY OR SWLY AHEAD OF THE FRONT
WITH LIMITED CONVERGENCE. MOREOVER...WV IMAGERY INDICATES DRYING
ALOFT IS SPREADING SEWD INTO NRN/CNTRL IL. THESE FACTORS ALONG WITH
DECREASING INSOLATION LOWERS OVERALL CONFIDENCE IN HOW MANY
ADDITIONAL STORMS CAN INITIATE...ESPECIALLY WITH SWD EXTENT INTO IL.
EVEN WHERE STORMS MANAGE TO DEVELOP...SHEAR/INSTABILITY PARAMETER
SPACE APPEARS TO SUPPORT MULTICELLS CAPABLE OF MODEST SEVERE
POTENTIAL.
..DIAL/CORFIDI.. 09/01/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...MKX...LSX...DVN...
LAT...LON 39379018 39949092 41588962 42928837 42238775 40858795
39878873 39379018
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 012311Z - 020115Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...A FEW STORMS MAY CONTINUE DEVELOPING FROM WCNTRL THROUGH
NERN IL AND EXTREME SERN WI INTO THE EARLY EVENING AND POSE A
MARGINAL THREAT FOR ISOLATED STRONG WIND GUSTS AND HAIL. WW ISSUANCE
IS UNLIKELY UNLESS CONVECTIVE TRENDS BEGIN TO SUGGEST DEVELOPMENT OF
A MORE ROBUST THREAT.
DISCUSSION...EARLY THIS EVENING A COLD FRONT EXTENDS FROM LAKE MI
SWWD THROUGH SERN WI...NWRN IL INTO NRN MO. CUMULUS HAS BEEN
INCREASING IN THE VICINITY OF THIS BOUNDARY...AND A FEW STORMS HAVE
DEVELOPED FROM NRN IL INTO SERN WI WHERE GLANCING INFLUENCE OF
ASCENT FROM THE SHORTWAVE TROUGH MOVING EWD THROUGH THE GREAT LAKES
MAY BE PRESENT. MULTILAYER CLOUDS FROM EARLIER TODAY WERE SLOW TO
DISSIPATE AND ALLOWED FOR ONLY PARTIAL RECOVERY OF THE BOUNDARY
LAYER. LATEST OBJECTIVE ANALYSIS INDICATES AROUND 1500-2000 J/KG
MLCAPE AND 6.5 C/KM MID-LEVEL LAPSE RATES WITH SFC TEMPERATURES
GENERALLY IN THE 80S. DEEP LAYER WLY SHEAR LESS THAN 30 KT EXISTS IN
WARMS SECTOR...AND WINDS HAVE SHIFTED WLY OR SWLY AHEAD OF THE FRONT
WITH LIMITED CONVERGENCE. MOREOVER...WV IMAGERY INDICATES DRYING
ALOFT IS SPREADING SEWD INTO NRN/CNTRL IL. THESE FACTORS ALONG WITH
DECREASING INSOLATION LOWERS OVERALL CONFIDENCE IN HOW MANY
ADDITIONAL STORMS CAN INITIATE...ESPECIALLY WITH SWD EXTENT INTO IL.
EVEN WHERE STORMS MANAGE TO DEVELOP...SHEAR/INSTABILITY PARAMETER
SPACE APPEARS TO SUPPORT MULTICELLS CAPABLE OF MODEST SEVERE
POTENTIAL.
..DIAL/CORFIDI.. 09/01/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...MKX...LSX...DVN...
LAT...LON 39379018 39949092 41588962 42928837 42238775 40858795
39878873 39379018
Non-Precipitation Watch, Warning, Advisory 08:57:43.3194037
...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 10 AM CDT /11 AM EDT/
THIS MORNING...
* VISIBILITY...PATCHY AREAS OF ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
THIS MORNING...
* VISIBILITY...PATCHY AREAS OF ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
Non-Precipitation Watch, Warning, Advisory 06:15:47.2232153
...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 9 AM CDT THIS MORNING...
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
Non-Precipitation Watch, Warning, Advisory 05:23:31.1921689
...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS
MORNING...
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
MORNING...
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
Non-Precipitation Watch, Warning, Advisory 04:27:58.1591721
...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM CDT THIS MORNING...
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A DENSE FOG
ADVISORY...WHICH IS IN EFFECT UNTIL 8 AM CDT THIS MORNING.
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A DENSE FOG
ADVISORY...WHICH IS IN EFFECT UNTIL 8 AM CDT THIS MORNING.
* VISIBILITY...ONE QUARTER MILE OR LESS.
* IMPACTS...GREATLY REDUCED VISIBILITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.
&&
Special Weather Statement 02:19:29.828530.2
AREAS OF FOG WITH PATCHY DENSE FOG IS LIKELY THIS MORNING ACROSS
NORTHERN ILLINOIS AND NORTHWEST INDIANA...RESULTING IN REDUCED
VISIBILITIES TO ONE MILE OR LESS IN SOME LOCATIONS. AREA MOTORISTS
SHOULD USE CAUTION AND BE PREPARED TO ENCOUNTER SUDDEN REDUCTIONS
IN VISIBILITY. THIS FOG SHOULD DISSIPATE JUST SHORTLY AFTER
SUNRISE THIS MORNING.
NORTHERN ILLINOIS AND NORTHWEST INDIANA...RESULTING IN REDUCED
VISIBILITIES TO ONE MILE OR LESS IN SOME LOCATIONS. AREA MOTORISTS
SHOULD USE CAUTION AND BE PREPARED TO ENCOUNTER SUDDEN REDUCTIONS
IN VISIBILITY. THIS FOG SHOULD DISSIPATE JUST SHORTLY AFTER
SUNRISE THIS MORNING.
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