Illinois, 2013

Hail in Illinois, August 31, 2013

August 31, 2013 · NWS LOT · 3 events in 3 counties and zones

A few strong to severe thunderstorms developed over northern Illinois during the late morning.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
3

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LOT wrote it up.

A few strong to severe thunderstorms developed over northern Illinois during the late morning.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before the first event at Aug 31, 8:17 AM CST, 1 hour 58 minutes earlier.

Area forecast discussion, Aug 31, 8:17 AM CST, 1 hour 58 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
917 AM CDT SAT AUG 31 2013

.DISCUSSION...
355 AM CDT

MAIN CONCERNS THIS FORECAST PERIOD ARE IN THE NEAR TERM WITH
THUNDERSTORM POTENTIAL EARLY THIS MORNING AS WELL AS ONCE AGAIN
LATER TODAY INTO THE AFTERNOON.

ALTHOUGH MOST OF THE CWA HAS REMAINED QUIET AFTER THE DEPARTURE OF
LAST NIGHTS STORMS...THERE HAS BEEN AN AREA OF THUNDERSTORMS THAT
HAS CONTINUED TO FESTER ACROSS EASTERN IOWA AND FAR NORTHWEST
ILLINOIS. WITH LIGHT STEERING FLOW ALOFT AND WITH PERSISTENT
FORCING OWING TO WAA IN THIS SAME AREA...THESE THUNDERSTORMS HAVE
MOVED VERY LITTLE. OVER THE LAST HOUR THIS AREA OF THUNDERSTORMS
HAVE STARTED TO MAKE SOME PROGRESS TO THE EAST...ALTHOUGH RATHER
SLOW. NONETHELESS...A STRONG THUNDERSTORM IS CURRENTLY CLIPPING
NORTHWEST WINNEBAGO COUNTY SLOWLY MOVING TO THE EAST SOUTHEAST.
ALTHOUGH THE SEVERE THREAT IS LOW AT THIS TIME...THE MAIN CONCERNS
WITH THIS STORM THIS MORNING WILL BE SMALL HAIL...HEAVY
DOWNPOURS...AS WELL AS LIGHTNING WITH LATEST LIGHTNING DATA
SHOWING ALMOST CONTINUOUS LIGHTNING. ALTHOUGH AS I WRITE...THIS
STORM IS ALREADY SHOWING SIGNS OF WEAKENING WITH IR SATELLITE ALSO
SHOWING THIS TREND WITH WARMING CLOUD TOPS. GUIDANCE AND EVEN
SHORT TERM GUIDANCE IS NOT HANDLING THIS COMPLEX VERY WELL...BUT
WOULD SUSPECT A CONTINUED DIMINISHING TREND AS THESE STORMS SLOWLY
DRIFT TO THE EAST. THIS IS IN RESPONSE TO WAA SHIFTING TO THE
SOUTH...AS A WEAK IMPULSE DRIFTS TO THE SOUTHEAST. SO OUTSIDE IF
THIS AREA ACROSS FAR NORTHWEST ILLINOIS...THE REMAINDER OF THE CWA
SHOULD REMAIN DRY OVER THE NEXT SEVERAL HOURS. WITH LINGERING LOW
LEVEL CLOUD COVER SPREAD ACROSS THE REGION THIS MORNING...MID/HIGH
CLOUDS FROM THIS COMPLEX OF STORMS WILL HELP FILL ANY GAPS WITH
SKIES EXPECTED TO START OFF MOSTLY CLOUDY THIS MORNING. BOTH
MID/HIGH AND LOW LEVEL CLOUD COVER SHOULD ALL DISSIPATE THROUGH
MID MORNING...WITH PARTLY CLOUDY/SUNNY SKIES THEN EXPECTED. WITH
RATHER WARM 925/850MB TEMPS STILL STRETCHED ACROSS THE CWA...DID
SLIGHTLY RAISE TEMPS. EXPECT TEMPS IN THE LOWER 80S FOR MOST
LOCATIONS TODAY...OUTSIDE OF UPPER 70S NEAR THE LAKE. THE WARMER
EXCEPTION WILL BE ACROSS THE FAR SOUTHERN CWA WHERE HIGH TEMPS
SHOULD WARM UP TO THE UPPER 80S OR AROUND 90. THIS AREA REMAINS
JUST SOUTH OF A LINGERING BOUNDARY...AND NEAR THERMAL AXIS.

HAVE INTRODUCED CHANCE POPS TO TODAYS FORECAST...MAINLY FOR THE
WESTERN AND SOUTHERN CWA TODAY. THIS PREVIOUSLY MENTIONED BOUNDARY
STEMS FROM AN AREA OF LOW PRESSURE OVER SOUTHEAST IOWA. WITH THESE
FEATURES IN PLACE AS WELL AS WEAK FORCING ALOFT SITUATED ACROSS
THE AREA...AM A LITTLE CONCERNED FOR THUNDERSTORM DEVELOPMENT ONCE
AGAIN WITH THE MAJORITY OF MY CONCERNS FOR AREAS ALONG AND SOUTH
OF A LINE FROM STREATOR IN ILLINOIS EAST TO HEBRON IN INDIANA. AS
THIS WEAK IMPULSE WEST OF THE CWA DRIFTS SOUTHEAST INTO CENTRAL
ILLINOIS TODAY...THIS SURFACE LOW AND BOUNDARY WILL SLOWLY SHIFT
EAST. THESE FORCING MECHANISMS...ALTHOUGH WEAK...COULD BE ENOUGH
TO IGNITE THUNDERSTORMS AS EARLY AS THIS MORNING FIRST ACROSS THE
WESTERN CWA BUT THEN SHIFTING SOUTHEAST LATER TODAY INTO THE
AFTERNOON. THIS WILL BE POSSIBLE AS MODERATE TO STRONG INSTABILITY
WILL ONCE AGAIN DEVELOP ALONG THIS FRONT...AS WELL AS MORE THAN
SUFFICIENT MOISTURE TO REMAIN IN PLACE. ALTHOUGH FLOW ALOFT WILL
BE WEAK AS WELL AS LOW BULK SHEAR VALUES...ITS THIS INSTABILITY
AND MOISTURE THAT I THINK COULD PROVIDE ENOUGH PUSH FOR A FEW
STORMS TO BECOME ON THE STRONGER SIDE. ALTHOUGH HAIL WOULD BE
POSSIBLE...I THINK THE GREATER THREAT COULD BE STRONG WIND GUSTS.
SO I DID ADD POPS AND EVEN MADE A LAST MINUTE INCREASE IN THESE
POPS...ESPECIALLY INTO THE AFTERNOON WHEN I THINK THE BEST
DEVELOPMENT WOULD OCCUR. DESPITE THE POSSIBILITY OF
THUNDERSTORMS...CONFIDENCE AS TO THE STRENGTH AND OVERALL COVERAGE
OF THESE STORMS IS LOW AT THIS TIME. SO WILL MAKE MENTION OF
STRONG WORDING FOR THESE THUNDERSTORMS IN THE HWO...BUT WILL NEED
TO CONTINUE TO MONITOR TRENDS FOR THE POSSIBILITY OF AN ISOLATED
SEVERE THREAT. EXPECT ANY DEVELOPMENT TO EXIT TO THE SOUTHEAST
LATER THIS EVENING...WITH DRY CONDITIONS THEN EXPECTED FOR THE
REMAINDER OF THE NIGHT.

RODRIGUEZ

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 14Z...

* CLUSTERS OF TSRA MOVING ACROSS THE TERMINALS LIKELY EXITING 16Z
  HOUR...DIRECT AIRPORT IMPACT POSSIBLE BRINGING BRIEF IFR VSBY.

* POSSIBLE MVFR STRATUS BUT TRENDS SHOW THIS FOCUSING NORTH OF THE
  TERMINALS...THOUGH PATCHY MVFR MAY AFFECT THE TERMINALS.

* VARIABLE NORTHEAST TO SOUTHEAST WINDS BECOMING STEADIER
  EAST/NORTHEAST INTO EARLY AFTERNOON. SPEEDS LIKELY COMING UP TO
  AROUND 10 KT.

MDB

//DISCUSSION...UPDATED 14Z...

EARLIER SPOTTY THUNDERSTORMS HAVE CONGEALED INTO A CLUSTER FROM
DPA WESTWARD WHICH IS MOVING EASTWARD. CLUSTER CONTINUES TO EXPAND
IN COVERAGE WITH THE STRONGEST CORES JUST WEST OF DPA AT 1410Z. ORD/MDW
WILL LIKELY BE AFFECTED BUT IT IS POSSIBLE THE HEAVIEST PORTIONS
OF THE STORM MOVE BETWEEN THE TWO. NONETHELESS...WILL CARRY TEMPO
TSRA. WIND THREAT LOOKS VERY LIMITED WITH STORMS HIGH BASED BUT
THERE COULD BE SOME PEA SIZE HAIL IF THE CORE CAN PULSE UP.
OTHERWISE BRIEF PERIOD OF IFR VSBY IS EXPECTED.

STRATUS REMAINS A CHALLENGE. WITH CONVECTION IN THE AREA EARLIER
STRATUS SEEMS TO HAVE ERODED BUT IT HOLES IN HIGH CLOUD ON
SATELLITE SUGGEST THAT IT REMAINS OVER LAKE MICHIGAN OFFSHORE OF
CHICAGO/GARY...WITH MORE WIDESPREAD STRATUS NEAR AND NORTH OF THE
IL/WI STATE LINE. WILL KEEP SCATTERED MENTION FOR NOW WITH
UNCERTAINTY IN HOW IT WILL EVOLVE...ESPECIALLY AFTER THE STORMS
CLEAR. STRATUS TO THE NORTH MAY BE ABLE TO TRICKLE INTO RFD SO
WILL NEED TO MONITOR FOR AN INCREASE IN COVERAGE NEXT 1-2 HRS.

MDB

FROM 12Z...

FRONTAL BOUNDARY HAS STALLED ACROSS NORTHERN IL/NORTHWEST IN EARLY
THIS MORNING...AND RESULTED IN ABUNDANT LLVL MOISTURE LINGERING.
WITH THE WEAK NORTHEAST FLOW...AT TIMES PATCHES OF BKN/OVC CIGS
HAVE PUSHED SOUTHWEST ACROSS THE LAKE INTO NORTHEAST IL. THIS HAS
RESULTED IN A FEW PERIODS OF BKN CIGS. A CLUSTER OF SHOWERS AND
ISOLATED THUNDERSTORMS DEVELOPED EARLY THIS MORNING AND PUSHED
EAST AND WEAKENED. THIS AREA OF PRECIPITATION HAS ARRIVED OVER
ORD...AND HAS SINCE DIMINISHED IN COVERAGE. HOWEVER...ISOLATED
SHOWERS/THUNDER CONTINUES AND MAY PERSIST THRU 16Z. WILL NEED TO
KEEP AN EYE ON THIS AS GUIDANCE IS BEGINNING TO SUGGEST ADDITIONAL
ISOLATED SHRA/TSRA MAY DEVELOP LATER THIS MORNING. SOUTH OF THE
TAF SITES BETTER SHRA/TSRA COVERAGE AND CHANCES WILL EXIST...WITH
A FEW THUNDERSTORMS POSSIBLY BECOMING STRONG TO SEVERE.

WITH HIGH PRESSURE CENTERED JUST TO THE NORTH OF THE AREA...WINDS
HAVE BECOME LIGHT. WHILE GUIDANCE IS INDICATING A SLIGHT INCREASE
IN THE SPEEDS AND POSSIBLE GUSTS INTO THE 14-16KT RANGE LATER THIS
MORNING/EARLY AFTERNOON...FEEL THAT THIS WILL HINGE ON CLOUD
COVER. SO HAVE OPTED TO REMOVE MENTION OF GUSTS FOR THE TIME
BEING. THEN WINDS DIMINISH THIS AFTN/EVE AS HIGH PRESSURE WILL BE
IN CONTROL.

ABUNDANT LLVL MOISTURE LINGERS THROUGH TONIGHT AND WITH THE LACK
OF DRYING...IT IS POSSIBLE THAT PATCHY FOG WILL DEVELOP AFT 06Z
SUN. AT THIS TIME GUIDANCE WAS HITTING THIS HARD AND BRINGING
VSBYS DOWN TO ARND 1-3SM AT A FEW TAF SITES. HAVE OPTED TO BE
CONSERVATIVE AND HOLD VSBYS AROUND 5-6SM.

BEACHLER

//ORD AND MDW CONFIDENCE...UPDATED 14Z...

* HIGH CONFIDENCE IN TSRA IN THE TERMINAL AREA...MEDIUM-HIGH
  CONFIDENCE IN PASSAGE OVERHEAD OF THE TERMINALS...AT LEAST
  BRIEFLY. MEDIUM-HIGH CONFIDENCE ON ACTIVITY BEING TO THE EAST
  DURING THE 16Z HOUR.

* MEDIUM CONFIDENCE IN STRATUS REMAINING MAINLY TO THE NORTH.

* MEDIUM-HIGH CONFIDENCE IN WIND TRENDS.

MDB

//OUTLOOK FOR ORD/MDW FOR 00Z MONDAY-12Z SATURDAY...UPDATED 12Z...

SUNDAY NIGHT...VFR. CHANCE OF TSRA IN THE AFTN/EVE. LOCAL MVFR/IFR
CIGS.

MONDAY THROUGH FRIDAY...VFR.

BEACHLER

&&

.MARINE...
320 AM CDT

LOW PRESSURE HAS PUSHED EAST TO LAKE ONTARIO WITH A TRAILING COLD
FRONT STRETCHING WEST TO JUST SOUTH OF LAKE MICHIGAN. A WEAK LOW
PRESSURE WAS DEVELOPING ALONG THE WESTERN END OF THIS
FRONT...HOWEVER WITH THE BOUNDARY SLOWLY PUSHING SOUTH THIS LOW
PRESSURE WILL LIKELY NOT AFFECT LAKE MICHIGAN. MEANWHILE A RIDGE
OF HIGH PRESSURE WILL PUSH OVER THE LAKE TODAY...BRINGING
DIMINISHING WINDS. WINDS EARLY THIS MORNING ARE GENERALLY AROUND
10 TO 20 KT...HOWEVER AS HIGH PRESSURE PUSHES OVERHEAD EXPECT
WINDS TO SLOWLY DIMINISH TO AROUND 5 TO 10 KT BY THIS AFTERNOON.
THIS WILL ALLOW WAVES TO STEADILY SUBSIDE. SO WILL CONTINUE
WITHOUT A SMALL CRAFT HEADLINE...AS WAVES OF 3 TO 5 FT WILL
SUBSIDE TO 2 TO 4 FT BY MIDDAY IN THE NEARSHORE WATERS.

THEN THE FOCUS TURNS TOWARDS A STRONGER FRONTAL BOUNDARY AND PUSH
OF COOLDER AIR FOR SUNDAY NIGHT/MONDAY. CONDITIONS APPEAR
FAVORABLE FOR WINDS TO GUST UP TO 30 KT MONDAY FROM THE
NORTH...WHICH WILL AID IN QUICKLY BUILDING WAVES. THIS WILL
ESPECIALLY BE TRUE FOR THE SOUTHERN HALF OF THE LAKE. AT THIS TIME
IT APPEARS A SMALL CRAFT ADVISORY WILL BE NEEDED ALONG WITH BEACH
HAZARDS DUE TO A HIGH PROBABILITY OF RIP CURRENTS. WITH A
CONTINUED FEED OF COLD AIR ACROSS THE WARMER LAKE...DESPITE A
SLOW DIMINISHING WIND...WAVES WILL REMAIN ELEVATED FOR THE
SOUTHERN HALF OF LAKE MICHIGAN THROUGH TUESDAY.

BEACHLER

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO
Hazardous weather outlook, Aug 31, 4:15 AM CST, 6 hours before
HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
515 AM CDT SAT AUG 31 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
011015-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
515 AM CDT SAT AUG 31 2013 /615 AM EDT SAT AUG 31 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TODAY AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  CHANCE OF THUNDERSTORMS...THE STRONGER COULD PRODUCE:
    HEAVY DOWNPOURS.
    CLOUD TO GROUND LIGHTNING.
    SMALL HAIL.
    AND LOCALIZED WIND GUSTS TO 50 MPH.

  AREAS AFFECTED AND TIMING:

  ALTHOUGH THERE IS A CHANCE OF THUNDERSTORMS THIS
  MORNING...EXPECT BETTER DEVELOPMENT AND COVERAGE TO BE LATER
  THIS AFTERNOON FOR AREAS ALONG AND SOUTH OF A LINE FROM STREATOR
  IN ILLINOIS EAST TO HEBRON IN INDIANA.

  DISCUSSION:

  WITH AN AREA OF LOW PRESSURE AND ASSOCIATED BOUNDARY REMAINING
  SITUATED ACROSS ILLINOIS...THUNDERSTORMS ARE EXPECTED TO ONCE
  AGAIN DEVELOP TODAY. DESPITE AN INCREASE IN INSTABILITY
  ANTICIPATED...OVERALL COVERAGE AND STRENGTH OF THESE
  THUNDERSTORMS SHOULD REMAIN LIMITED. NONETHELESS...A FEW
  THUNDERSTORMS COULD BECOME STRONG WITH THE POSSIBILITY FOR
  LOCALIZED STRONG WIND GUSTS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY AND SUNDAY NIGHT ACROSS
THE ENTIRE OUTLOOK AREA....AND A SLIGHT CHANCE OF THUNDERSTORMS
ONCE AGAIN WEDNESDAY NIGHT THROUGH THURSDAY ACROSS NORTHERN
ILLINOIS.

LARGE WAVES COULD PRODUCE STRONG CURRENTS AND HAZARDOUS SWIMMING
CONDITIONS AT LAKE MICHIGAN BEACHES ON MONDAY...LABOR
DAY...THROUGH TUESDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY LATER TODAY.

&&

LMZ740>745-011015-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
515 AM CDT SAT AUG 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY AND SUNDAY EVENING...AND
A SLIGHT CHANCE OF THUNDERSTORMS ONCE AGAIN WEDNESDAY NIGHT
THROUGH THURSDAY.

STRONG WINDS AND HIGH WAVES MAY LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT MONDAY THROUGH TUESDAY MORNING ALONG BOTH THE ILLINOIS
AND INDIANA SHORES.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-011015-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
515 AM CDT SAT AUG 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE NORTHERN HALF
OF THE LAKE TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY THROUGH SUNDAY EVENING.

&&

RODRIGUEZ

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

In the hours before

Local storm report, Aug 31, 9:05 AM CST, 1 hour 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1005 AM CDT SAT AUG 31 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 AM     HEAVY RAIN       ST. CHARLES             41.92N 88.30W
08/31/2013  E0.93 INCH       KANE               IL   TRAINED SPOTTER

            RAINFALL SINCE 0730 AM CDT THIS MORNING.

&&

BN
Local storm report, Aug 31, 10:05 AM CST, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1105 AM CDT SAT AUG 31 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1104 AM     HAIL             BATAVIA                 41.85N 88.30W
08/31/2013  E0.25 INCH       KANE               IL   CO-OP OBSERVER

&&

The radar

The Chicago radar (KLOT), 31 km away, was scanning. The volume nearest the first event began at 16:13 UTC.

Open the radar archive at this moment

Event by event

3 hail. Local standard time, as filed.

Hail, Kane

When
August 31, 10:15 AM CST to 10:17 AM CST
Where
Kane County, 1.66 mi ESE of Batavia
Measured
0.88 in hail
Reported by
Public
Coordinates
41.842, -88.289

Penny to nickel size hail was reported near Pine Street and Raddant Road.

Hail, De Kalb

When
August 31, 10:22 AM CST to 10:26 AM CST
Where
De Kalb County, Sandwich to 1.22 mi SE of Sandwich
Measured
1.5 in hail
Reported by
Trained Spotter
Coordinates
41.650, -88.620

Quarter to ping pong ball size hail was reported for three to four minutes.

Hail, Du Page

When
August 31, 10:32 AM CST to 10:34 AM CST
Where
Du Page County, 0.69 mi S of Brandywine
Measured
0.75 in hail
Reported by
COOP Observer
Coordinates
41.840, -87.950

What these are

Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Illinois in 2013Every state in 2013This day in weather historyWarnings in Illinois, August 2013

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 474973, 474974, 474975.