AREAS AFFECTED...PORTIONS ERN WI...NERN IL.
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 030023Z - 030230Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...GROWING CLUSTERS OF STG-SVR TSTMS OVER NERN AND E-CENTRAL
WI...INTERACTING WITH LM LAKE-BREEZE BOUNDARY -- APPEAR TO BE
GETTING BETTER ORGANIZED AND GROWING UPSCALE SUCH THAT THEIR
INITIALLY ISOLATED SVR THREAT MAY BECOME SOMEWHAT MORE WIDESPREAD.
DISCUSSION...BOUNDARY WAS ANALYZED AT 00Z FROM COOK/LAKE COUNTIES IL
NNWWD TO SRN CLUSTER OVER WINNEBAGO COUNTY WI...THEN NWD TO
CONVECTION COVERING PORTIONS OCONTO/FOREST/LANGLADE COUNTIES.
ALTHOUGH DEEP-LAYER SHEAR IS RELATIVELY WEAK...LACK OF MORE ROBUST
DEEP-LAYER WINDS ACTUALLY WILL AID IN THE SORT OF
REARWARD/DISCRETELY PROPAGATIONAL STORM-SCALE PROCESSES NECESSARY TO
KEEP THIS ACTIVITY GOING...WITHOUT NECESSARILY MOVING OVER
RELATIVELY STABLE AIR ON E SIDE OF LAKE BREEZE. ULTIMATELY...MIX OF
FORWARD- AND REARWARD-PROPAGATIONAL PROCESSES IS POSSIBLE WITH THIS
ACTIVITY...IF COLD POOL AND RELATED ISALLOBARIC PERTURBATIONS BUILD
ENOUGH ON STORM SCALE. AS SUCH...THREAT FOR DAMAGING GUSTS AND OCNL
LARGE HAIL MAY EXPAND LATERALLY E-W...AS WELL AS TRANSLATE SWD
TOWARD SERN WI AND NERN IL. AIR MASS ON W SIDE OF BOUNDARY IS
CHARACTERIZED BY SFC TEMPS MID-UPPER 90S F...FCST TO COOL TO LOW 90S
IN NEXT 2-3 HOURS...AS WELL AS DEW POINTS RANGING FROM 70S OVER NRN
WI TO LOW-MID 60S NEAR WI/IL BORDER. WELL-MIXED BOUNDARY LAYERS
WITH HIGHER DEWPOINT DEPRESSIONS OVER SRN WI/NRN WILL WILL BE MORE
SUITABLE FOR EVAPORATIONALLY DRIVEN OUTFLOW ACCELERATION...WHILE
PRECIP-LOADING PROCESSES ON STORM SCALE WILL DRIVE MOST
DAMAGING-WIND POTENTIAL WITH NERN WI ACTIVITY. BUOYANCY...THOUGH
LARGER FARTHER N...IS AND WILL REMAIN SUFFICIENT FOR A FEW MORE
HOURS TO SUPPORT STG-SVR TSTMS INTO SERN WI/NERN IL AS WELL...WITH
MLCAPE STILL AROUND 2000 J/KG SW MKE.
..EDWARDS/HART.. 07/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MQT...GRB...LOT...MKX...ARX...
LAT...LON 42698951 45138975 45888919 45918848 45868811 44608791
42858791 41898784 41628842 42418935 42698951
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
Monday, July 2, 2012
Special Weather Statement 16:27:28.5865552
...EXTENDED PERIOD OF HOT WEATHER TO CONTINUE...
HOT AND HUMID CONDITIONS ARE FORECAST TO CONTINUE THROUGH SATURDAY
WITH HIGHS IN THE 90S...AND POSSIBLY NEARING 100 DEGREES AT
TIMES. HEAT INDEX READINGS OF 105 DEGREES OR HIGHER ARE POSSIBLE
DURING THE HOTTEST AFTERNOONS.
A WARM FRONT ACROSS THE AREA THIS AFTERNOON WILL LIFT NORTH ON
TUESDAY. THIS WILL LIKELY ALLOW HUMIDITY LEVELS TO DECREASE
SOMEWHAT DURING THE PEAK OF THE AFTERNOON HEAT ON TUESDAY WITH
HEAT INDEX VALUES TOPPING OUT AROUND 100. THE FRONT WILL SAG BACK
SOUTH ACROSS THE AREA WEDNESDAY...WITH MOISTURE POOLING NEAR ALONG
THE FRONT PRODUCING HIGHER HUMIDITY LEVELS AND RESULTING IN HIGHER
HEAT INDEX READINGS WEDNESDAY AFTERNOON. THE COMBINED EFFECT OF
HEAT AND HUMIDITY WILL LIKELY BE GREATEST WEDNESDAY...THURSDAY AND
FRIDAY AFTERNOONS...WITH HEAT INDEX VALUES BETWEEN 100 AND 110.
RELIEF IS NOT EXPECTED UNTIL SUNDAY...AFTER ANOTHER COLD FRONT
MOVES THROUGH.
THE LONG DURATION OF THIS HEAT WAVE WILL TAKE A TOLL ON THOSE
MOST SUSCEPTIBLE TO HEAT. HOSPITALS... EMERGENCY MANAGERS...AND
THOSE RESPONSIBLE FOR HANDLING HEAT RELATED ILLNESS SHOULD PREPARE
NOW FOR THE POTENTIAL OF AN EXTENDED HEAT WAVE.
HOT AND HUMID CONDITIONS ARE FORECAST TO CONTINUE THROUGH SATURDAY
WITH HIGHS IN THE 90S...AND POSSIBLY NEARING 100 DEGREES AT
TIMES. HEAT INDEX READINGS OF 105 DEGREES OR HIGHER ARE POSSIBLE
DURING THE HOTTEST AFTERNOONS.
A WARM FRONT ACROSS THE AREA THIS AFTERNOON WILL LIFT NORTH ON
TUESDAY. THIS WILL LIKELY ALLOW HUMIDITY LEVELS TO DECREASE
SOMEWHAT DURING THE PEAK OF THE AFTERNOON HEAT ON TUESDAY WITH
HEAT INDEX VALUES TOPPING OUT AROUND 100. THE FRONT WILL SAG BACK
SOUTH ACROSS THE AREA WEDNESDAY...WITH MOISTURE POOLING NEAR ALONG
THE FRONT PRODUCING HIGHER HUMIDITY LEVELS AND RESULTING IN HIGHER
HEAT INDEX READINGS WEDNESDAY AFTERNOON. THE COMBINED EFFECT OF
HEAT AND HUMIDITY WILL LIKELY BE GREATEST WEDNESDAY...THURSDAY AND
FRIDAY AFTERNOONS...WITH HEAT INDEX VALUES BETWEEN 100 AND 110.
RELIEF IS NOT EXPECTED UNTIL SUNDAY...AFTER ANOTHER COLD FRONT
MOVES THROUGH.
THE LONG DURATION OF THIS HEAT WAVE WILL TAKE A TOLL ON THOSE
MOST SUSCEPTIBLE TO HEAT. HOSPITALS... EMERGENCY MANAGERS...AND
THOSE RESPONSIBLE FOR HANDLING HEAT RELATED ILLNESS SHOULD PREPARE
NOW FOR THE POTENTIAL OF AN EXTENDED HEAT WAVE.
Special Weather Statement 04:11:54.1496286
...EXTENDED HEAT WAVE EXPECTED...
HOT AND HUMID CONDITIONS ARE FORECAST THROUGH SATURDAY WITH HIGHS
IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT TIMES. DURING THE
HOTTEST AFTERNOONS HEAT INDEX READINGS OVER 105 DEGREES ARE
POSSIBLE.
A WARM FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA
TODAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION MUCH OF
THIS WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF THUNDERSTORMS
COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF FROM THE HEAT AT
TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE THE HEAT WAVE COULD
BE RATHER UNRELENTING. THE LONG DURATION OF THIS HEAT WAVE WILL
TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT. HOSPITALS...
EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR HANDLING HEAT
RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL OF AN
EXTENDED HEAT WAVE.
HOT AND HUMID CONDITIONS ARE FORECAST THROUGH SATURDAY WITH HIGHS
IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT TIMES. DURING THE
HOTTEST AFTERNOONS HEAT INDEX READINGS OVER 105 DEGREES ARE
POSSIBLE.
A WARM FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA
TODAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION MUCH OF
THIS WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF THUNDERSTORMS
COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF FROM THE HEAT AT
TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE THE HEAT WAVE COULD
BE RATHER UNRELENTING. THE LONG DURATION OF THIS HEAT WAVE WILL
TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT. HOSPITALS...
EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR HANDLING HEAT
RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL OF AN
EXTENDED HEAT WAVE.
Sunday, July 1, 2012
Special Weather Statement 16:43:16.5959404
...EXTENDED HEAT WAVE EXPECTED...
HOT AND HUMID CONDITIONS ARE FORECAST THROUGH MUCH OF THE UPCOMING
WEEK WITH HIGHS IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT
TIMES. DURING THE HOTTEST AFTERNOONS HEAT INDEX READINGS OVER 105
DEGREES ARE POSSIBLE.
A WARM FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA
THROUGH MONDAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION
MUCH OF THE WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF
THUNDERSTORMS COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF
FROM THE HEAT AT TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE THE
HEAT WAVE COULD BE RATHER UNRELENTING. THE LONG DURATION OF THIS
HEAT WAVE WILL TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT.
HOSPITALS...EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR
HANDLING HEAT RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL
OF AN EXTENDED HEAT WAVE.
HOT AND HUMID CONDITIONS ARE FORECAST THROUGH MUCH OF THE UPCOMING
WEEK WITH HIGHS IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT
TIMES. DURING THE HOTTEST AFTERNOONS HEAT INDEX READINGS OVER 105
DEGREES ARE POSSIBLE.
A WARM FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA
THROUGH MONDAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION
MUCH OF THE WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF
THUNDERSTORMS COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF
FROM THE HEAT AT TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE THE
HEAT WAVE COULD BE RATHER UNRELENTING. THE LONG DURATION OF THIS
HEAT WAVE WILL TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT.
HOSPITALS...EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR
HANDLING HEAT RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL
OF AN EXTENDED HEAT WAVE.
Mesoscale Discussion 11:33:47.4121073
AREAS AFFECTED...PORTIONS OF NERN IL / CNTRL-NRN IND
CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY
VALID 011633Z - 011730Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...THE RISK FOR ISOLD LARGE HAIL AND SEVERE MICROBURSTS WILL
INCREASE AS STORM COVERAGE INCREASES THIS AFTERNOON. SHORT TERM
TRENDS WILL BE MONITORED.
DISCUSSION...VISIBLE SATELLITE/RADAR MOSAIC OVER THE PAST FEW HOURS
HAS SHOWN A COLLAPSING TSTM COMPLEX INVOF THE IA/IL/MO BORDER. A
GROWING AREA OF TSTMS OVER NERN IL MAY BE THE RESULT OF AN ARCING
GRAVITY WAVE INTERACTING WITH A FRONTAL ZONE DRAPED ACROSS THE
REGION. 12Z DVN/ILX RAOBS FEATURED STEEP MID LEVEL LAPSE RATES
AROUND 8 DEG C/KM. AS THE BOUNDARY LAYER CONTINUES TO HEAT AND
DESTABILIZES FURTHER...UPWARDS OF 3000-4000 J/KG MLCAPE PER NAM
FORECAST SOUNDINGS WITHIN A BELT OF MODEST WLY-NWLY FLOW...ON THE
FRINGE OF A SRN MICH MID LEVEL SPEED MAX...WILL ACT TO SUPPORT
ORGANIZED SEVERE MULTICELLS CAPABLE OF ISOLD LARGE HAIL/SEVERE WIND
GUSTS.
..SMITH/THOMPSON.. 07/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILN...IWX...IND...LOT...ILX...DVN...
LAT...LON 39568647 41328918 41988935 42028795 40788485 40028462
39408541 39568647
CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY
VALID 011633Z - 011730Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...THE RISK FOR ISOLD LARGE HAIL AND SEVERE MICROBURSTS WILL
INCREASE AS STORM COVERAGE INCREASES THIS AFTERNOON. SHORT TERM
TRENDS WILL BE MONITORED.
DISCUSSION...VISIBLE SATELLITE/RADAR MOSAIC OVER THE PAST FEW HOURS
HAS SHOWN A COLLAPSING TSTM COMPLEX INVOF THE IA/IL/MO BORDER. A
GROWING AREA OF TSTMS OVER NERN IL MAY BE THE RESULT OF AN ARCING
GRAVITY WAVE INTERACTING WITH A FRONTAL ZONE DRAPED ACROSS THE
REGION. 12Z DVN/ILX RAOBS FEATURED STEEP MID LEVEL LAPSE RATES
AROUND 8 DEG C/KM. AS THE BOUNDARY LAYER CONTINUES TO HEAT AND
DESTABILIZES FURTHER...UPWARDS OF 3000-4000 J/KG MLCAPE PER NAM
FORECAST SOUNDINGS WITHIN A BELT OF MODEST WLY-NWLY FLOW...ON THE
FRINGE OF A SRN MICH MID LEVEL SPEED MAX...WILL ACT TO SUPPORT
ORGANIZED SEVERE MULTICELLS CAPABLE OF ISOLD LARGE HAIL/SEVERE WIND
GUSTS.
..SMITH/THOMPSON.. 07/01/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILN...IWX...IND...LOT...ILX...DVN...
LAT...LON 39568647 41328918 41988935 42028795 40788485 40028462
39408541 39568647
Radar Outage Notification 09:12:02.3279077
NOUS63 KLOT 011410
FTMLOT
Message Date: Jul 01 2012 14:10:23KLOT WSR-88D RADAR HAS FAILED. TECHS WILL BE INVESTIGATING THE PROBLEM. NO ETA YET ON RETURN TO SERVICE.
FTMLOT
Message Date: Jul 01 2012 14:10:23KLOT WSR-88D RADAR HAS FAILED. TECHS WILL BE INVESTIGATING THE PROBLEM. NO ETA YET ON RETURN TO SERVICE.
Special Weather Statement 04:39:40.1661220
...EXTENDED HEAT WAVE EXPECTED...
HOT AND HUMID CONDITIONS ARE FORECAST TODAY THROUGH MUCH OF THE
UPCOMING WEEK. HEAT INDICES TODAY ARE FORECAST TO TOP OUT IN THE
UPPER 90S TO NEARLY 105...WITH THE HIGHEST READINGS EXPECTED WELL
SOUTH OF INTERSTATE 80. THE HEAT IS FORECAST TO PERSIST THROUGH
THE WEEK WITH HIGHS IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT
TIMES...THROUGH THE UPCOMING WEEK. DURING THE HOTTEST AFTERNOONS
HEAT INDEX READINGS OVER 105 DEGREES ARE POSSIBLE.
A FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA TODAY
THROUGH MONDAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION
MUCH OF THE WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF
THUNDERSTORMS COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF
FROM THE HEAT AT TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE
THE HEAT WAVE COULD BE RATHER UNRELENTING. THE LONG DURATION OF
THIS HEAT WAVE WILL TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT.
HOSPITALS...EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR
HANDLING HEAT RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL
OF AN EXTENDED HEAT WAVE.
HOT AND HUMID CONDITIONS ARE FORECAST TODAY THROUGH MUCH OF THE
UPCOMING WEEK. HEAT INDICES TODAY ARE FORECAST TO TOP OUT IN THE
UPPER 90S TO NEARLY 105...WITH THE HIGHEST READINGS EXPECTED WELL
SOUTH OF INTERSTATE 80. THE HEAT IS FORECAST TO PERSIST THROUGH
THE WEEK WITH HIGHS IN THE 90S...AND POSSIBLY EVEN NEARING 100 AT
TIMES...THROUGH THE UPCOMING WEEK. DURING THE HOTTEST AFTERNOONS
HEAT INDEX READINGS OVER 105 DEGREES ARE POSSIBLE.
A FRONT IS FORECAST TO MOVE SLOWLY NORTH ACROSS THE AREA TODAY
THROUGH MONDAY...THEN STALL OUT NEAR OR JUST NORTH OF THE REGION
MUCH OF THE WEEK. ITS NOT OUT OF THE QUESTION THAT BOUTS OF
THUNDERSTORMS COULD PUSH THIS FRONT SOUTH AND BRING SOME RELIEF
FROM THE HEAT AT TIMES THIS WEEK...BUT CURRENT INDICATIONS ARE
THE HEAT WAVE COULD BE RATHER UNRELENTING. THE LONG DURATION OF
THIS HEAT WAVE WILL TAKE A TOLL ON THOSE MOST SUSCEPTIBLE TO HEAT.
HOSPITALS...EMERGENCY MANAGERS...AND THOSE RESPONSIBLE FOR
HANDLING HEAT RELATED ILLNESS SHOULD PREPARE NOW FOR THE POTENTIAL
OF AN EXTENDED HEAT WAVE.
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