A right moving supercell moved into northwestern Indiana producing primarily large hail and heavy rain.
Every event with a place to put it. Tap one for its entry below.
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.
The episode as NWS LOT wrote it up.
A right moving supercell moved into northwestern Indiana producing primarily large hail and heavy rain.
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 May 20, 7:32 PM CST, 1 hour earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 832 PM CDT TUE MAY 20 2014 .MESOSCALE DISCUSSION... 830 PM CDT ONE LARGE HP SUPERCELL CONTINUES TO MOVE EAST-SOUTHEAST ACROSS FAR NORTHERN WILL AND INTO CENTRAL/SOUTHERN COOK COUNTY AT 820 PM CDT. RADAR SHOWS A STRONG BUT BROAD CIRCULATION WITH AN IMPRESSIVE WIND MAX ON THE LOWEST SCANS. LOOP OF MDW TDWR SHOWS MULTIPLE OCCLUSIONS OF THE RFD WHILE MESO NET SITES SHOW THAT THE OUTFLOW IS RATHER COOL WHICH COMBINED WITH THE BROAD CIRCULATION SUPPORTS A LOW BUT NOT NECESSARILY ZERO TORNADO THREAT. THIS LOW THREAT WILL TRANSLATE DOWNSTREAM ACROSS SOUTHERN COOK COUNTY IN THE NEAR TERM...WITH LAKE COUNTY INDIANA CERTAINLY IN THE THREAT AREA DEPENDING ON EVOLUTION ACROSS COOK. DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL ARE STILL THE MAIN THREAT. OTHERWISE MOIST MID LEVEL WAA CONTINUES TO STREAM NORTHEASTWARD INTO THE FORECAST AREA WHICH WILL LIKELY RESULT IN AT LEAST CONTINUED SCATTERED CONVECTIVE DEVELOPMENT ACROSS NORTHEAST IL...WHILE THE BIGGER SUPERCELL AND ANY ASSOCIATED NEW DEVELOPMENT TRACK INTO NORTHWEST INDIANA. BEYOND THAT THE SYNOPTIC BOUNDARY REMAINS STRETCHED ACROSS CENTRAL IOWA WITH SEVERAL OTHER SUPERCELLS LINED UP ALONG IT. TRAJECTORY OF THESE WOULD TAKE THEM INTO THE NORTHERN CWA WITH THE NEAREST CELL NEARING LEE/OGLE COUNTY. EARLIER STORMS ALONG THE SAME TRACK MANAGED TO WEAKEN AS THEY MOVED EAST THANKS TO WORKED OVER AIR SO THIS MAY BE THE TREND. SEVERAL ADDITIONAL WAVES OF CONVECTION ARE POSSIBLE INTO THE OVERNIGHT HOURS AS WHAT APPEARS TO BE A MID LEVEL WAVE ACROSS CENTRAL IOWA TRACKS EASTWARD. MDB && .DISCUSSION... 318 PM CDT MAIN FORECAST ISSUES REVOLVE AROUND SHORT TERM...IN PARTICULAR THE INITIATION AND EVOLUTION OF POTENTIALLY SEVERE CONVECTION ACROSS THE AREA LATE THIS AFTERNOON INTO TONIGHT. FAIRLY HIGH PROBABILITY OF SEVERE WATCH BEING ISSUED FOR THE AREA IN THE NEXT COUPLE OF HOURS. AT 20Z...SURFACE OBS AND VISIBLE SATELLITE INDICATED A WEAK COLD FRONT STRETCHING FROM NEAR MILWAUKEE...TO JUST SOUTH OF DUBUQUE AND BACK ACROSS SOUTHWEST IOWA. SATELLITE OBSERVED CUMULUS CLOUD FIELD SUGGESTS CONVECTIVE INITIATION IS PERHAPS MOST LIKELY OVER SOUTHEAST WISCONSIN NEAR INTERSECTION OF FRONT AND WEAK LAKE BREEZE BOUNDARY AND ALSO BACK ALONG THE FRONT INTO EASTERN IA WHERE CU HAS DEVELOPED MORE RAPIDLY IN LAST HOUR OR SO. 12Z SOUNDINGS FROM ACROSS THE REGION AND UPSTREAM SITES DEPICTED VERY STEEP MID-LEVEL LAPSE RATES AND PRESENCE OF EML...WITH RATHER DRY MOISTURE PROFILES. BATTLE BETWEEN CAPPING EML AND MOIST CONVERGENCE ALONG AFOREMENTIONED BOUNDARIES APPEARS POISED TO PLAY OUT ACROSS THE AREA IN THE NEXT COUPLE OF HOURS...WITH CONVECTION-ALLOWING HIGH-RES MODEL GUIDANCE GENERALLY IN SUPPORT OF DEVELOPING THUNDERSTORMS ALONG THE FRONT LATE THIS AFTERNOON AND EARLY THIS EVENING...WITH STORMS EVOLVING EAST AND SOUTHEAST ACROSS THE WFO LOT CWA. EFFECTIVE BULK SHEAR IN THE 35-45 KT RANGE MLCAPES AROUND 2000 J/KG SHOULD SUPPORT SUPERCELL STRUCTURES...WITH UNIDIRECTIONAL WIND PROFILES AND DRY MID-LEVEL AIR LIKELY TO SUPPORT DAMAGING WIND THREAT...AS WELL AS LARGE HAIL POTENTIAL WITH THE STEEP LAPSE RATES. WHILE SOUNDINGS FAIRLY DRY ABOVE THE BOUNDARY LAYER...WIDESPREAD HEAVY RAINFALL NOT LIKELY. HOWEVER...WEST-EAST BOUNDARY ORIENTATION (FUTURE OUTFLOW AND WEAK FRONT) COULD SUPPORT SOME TRAINING/BACK-BUILDING OF CONVECTION WHICH COULD POSE A LOCALLY HEAVY RAINFALL/FLOODING THREAT. CONVECTION SHOULD SHOW A GRADUAL DIURNAL DECREASE LATE TONIGHT...THOUGH WILL LIKELY CONTINUE AS IT EVOLVES OFF TO THE EAST/SOUTHEAST OF THE CWA THROUGH EARLY WEDNESDAY MORNING IN ASSOCIATION WITH MID-LEVEL SHORT WAVE APPROACHING LATER TONIGHT FROM NEBRASKA. ON WEDNESDAY...FRONT CONTINUES TO SAG ACROSS THE SOUTHERN HALF OF THE FORECAST AREA. FRONT AND RENEWED CONVECTIVE DEVELOPMENT WILL BE FOCUSED IN FAR SOUTH PORTION OF CWA AS DESTABILIZATION OCCURS DURING MIDDAY AND AFTERNOON HOURS. SHEAR/CAPE BALANCE AGAIN INDICATES SEVERE THREAT...THOUGH MAINLY OFF TO THE SOUTH/SOUTHEAST OF THE CWA AS STORMS MATURE IN THE AFTERNOON. ONCE FRONT CLEARS TO THE SOUTH BY WEDNESDAY EVENING...QUIET WEATHER APPEARS IN STORE THROUGH THE END OF THE WEEK AS HIGH PRESSURE BUILDS ACROSS THE UPPER MIDWEST. AFTER SUMMER-LIKE MID-80S TODAY...TEMPS WILL SETTLE BACK INTO THE 70S WITH 60S ALONG THE LAKE WITH NORTH-NORTHEAST WINDS THROUGH FRIDAY. GRADUAL WARMING INTO THE MEMORIAL DAY WEEKEND LOOKS ON TRACK WITH DIMINISHING LAKE INFLUENCE. 80S LOOK TO RETURN SUNDAY AND ESPECIALLY MONDAY...WITH SOME INDICATION WE COULD BE APPROACHING 90 DEGREES ESPECIALLY ACROSS OUR SOUTHEAST CWA. MAIN QUESTION IN LATER PERIODS WILL BE RETURN OF SHRA/TSRA THREAT AS UPPER RIDGE FORMS OVERHEAD AND EVENTUALLY SHIFTS EAST OF THE CWA. TSRA THREAT APPEARS TO GRADUALLY INCREASE ACROSS WEST/NORTHWEST PORTIONS OF CWA LATER SUNDAY INTO TUESDAY...THOUGH LIKELY TO BE A FEW PERIODS WITHIN OTHERWISE MANY DRY HOURS. MOST OF MEMORIAL DAY HOLIDAY WEEKEND SHOULD BE PRETTY DECENT FOR OUTDOOR PLANS. RATZER && .AVIATION... //ORD AND MDW CONCERNS...UPDATED 00Z... * THUNDERSTORMS THIS EVENING. * POTENTIAL FOR MVFR VSBY/CIGS OVERNIGHT. BMD //DISCUSSION...UPDATED 00Z... LINE OF THUNDERSTORMS HAS ALREADY FIRED FROM WESTERN IOWA EAST ALONG THE IL/WI STATE LINE. INDIVIDUAL CELLS ARE EXPECTED TO MOVE EAST THIS EVENING...HOWEVER THE LINE IS EXPECTED TO SLOWLY SAG SOUTHWARD WITH ADDITIONAL DEVELOPMENT OCCURRING NEAR THE OVER THE TERMINALS THIS EVENING. UNLESS THE LINE ACCELERATES...THERE COULD BE A 3-4 HOUR WINDOW OF TRAINING THUNDERSTORMS ACROSS THE TERMINALS. SOME OF THE STRONGEST THUNDERSTORMS COULD PRODUCE LARGE HAIL AND DAMAGING WINDS. SOME MODELS/GUIDANCE POINT TO A WINDOW OF POTENTIAL MVFR CIGS DEVELOPING OVERNIGHT...ROUGHLY 09Z TO 14Z GIVE OR TAKE AN HOUR OR TWO...HOWEVER CONFIDENCE REMAINS LOW ON WHETHER OR NOT THIS WILL MATERIALIZE SO WILL MAINTAIN A SCT015 IN THE MEANTIME. MIST/FOG REMAINS A POSSIBILITY THOUGH REDUCING VSBY TO MVFR. WINDS EXPECTED BECOME LIGHT AND VARIABLE FOR A PERIOD EARLY WEDNESDAY MORNING...THEN SHOULD BECOME WNW TO NW DURING THE DAY WEDNESDAY AS THE FRONT SINKS INTO CENTRAL ILLINOIS. BMD //ORD AND MDW CONFIDENCE...UPDATED 00Z... * MEDIUM HIGH-CONFIDENCE IN TSRA/TIMING. * LOW CONFIDENCE IN MVFR CIGS OVERNIGHT. BMD //OUTLOOK FOR ORD/MDW FOR 12Z THURSDAY-12Z TUESDAY...UPDATED 00Z... THURSDAY THROUGH SUNDAY...VFR. MONDAY...CHC TSRA. BMD && .MARINE... 216 PM CDT LOW PRESSURE ACROSS NORTHERN MINNESOTA IS LIFTING A WARM FRONTAL BOUNDARY NORTHWARD ACROSS THE LAKE THIS AFTERNOON. IN THE WAKE OF THIS BOUNDARY...A WARM AND MOIST AIRMASS IS LIFTING NORTHWARD ACROSS THE COOL LAKE WATERS. THIS WILL INCREASE THE THREAT FOR FOG ACROSS THE LAKE TONIGHT. OTHERWISE...THE MAIN THREAT TONIGHT...MAINLY ACROSS THE SOUTHERN PORTION OF THE LAKE WILL BE STRONG TO SEVERE THUNDERSTORMS. THE ATMOSPHERE WILL BE SUPPORTIVE OF STORMS CAPABLE OF PRODUCING WINDS IN EXCESS OF 50 KT AND LARGE HAIL. THE MAIN THREAT LOOKS TO BE THIS EVENING. HIGH PRESSURE WILL GRADUALLY BUILD SOUTHEASTWARD OVER THE LAKE BY FRIDAY. A PERIOD OF NORTHERLY WINDS ARE LIKELY PRIOR TO THE ARRIVAL OF THE SURFACE HIGH. HOWEVER...WINDS ARE EXPECTED TO SHIFT BACK OUT OF THE SOUTH AND WILL LIKELY INCREASE SOME LATER IN THE WEEKEND INTO EARLY NEXT WEEK AS THE SURFACE HIGH SHIFTS EASTWARD ACROSS THE OHIO VALLEY. KJB && .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 NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 549 PM CDT TUE MAY 20 2014 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 212300- 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- 549 PM CDT TUE MAY 20 2014 /649 PM EDT TUE MAY 20 2014/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME OF WHICH MAY BE SEVERE WITH: HAIL TO THE SIZE OF GOLF BALLS. DAMAGING WINDS. ISOLATED FLASH FLOODING. AN OUTSIDE CHANCE OF A TORNADO. AREAS AFFECTED AND TIMING: SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP BY EARLY THIS EVENING ACROSS FAR NORTHERN ILLINOIS AND EXPAND IN COVERAGE THROUGH THE EVENING ACROSS MUCH OF NORTH CENTRAL AND NORTHEAST ILLINOIS...AND INTO NORTHWEST INDIANA. STORMS WILL SLOWLY DIMINISH IN COVERAGE AND INTENSITY OVERNIGHT. THE SEVERE WEATHER THREAT LOOKS TO BE AT ITS PEAK ALONG...AND NORTH OF INTERSTATE 80...AND MAINLY BETWEEN 6 PM AND 1 AM. DISCUSSION: A WEAK COLD FRONT WILL MOVE SLOWLY SOUTHEAST INTO THE AREA THIS EVENING. SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP ALONG OR JUST AHEAD OF THE FRONT ACROSS FAR NORTHERN ILLINOIS LATE THIS AFTERNOON. THESE INITIAL STORMS WILL BE CAPABLE OF LARGE HAIL AND STRONG WINDS...ALONG WITH AN OUTSIDE CHANCE OF A TORNADO. AS WINDS ALOFT INCREASE THIS EVENING STORMS WILL LIKELY ORGANIZE AND HAVE THE GREATEST POTENTIAL OF PRODUCING STRONG WINDS AS THEY EVOLVE SOUTHEAST ACROSS THE REGION...INCLUDING ACROSS THE CHICAGO METRO AREA. THE STORMS WILL MAINTAIN A HAIL THREAT AS WELL AS AN ISOLATED FLASH FLOOD THREAT...AS IT IS POSSIBLE FOR A SEVERAL HOUR PERIOD OF STORMS IN SOME COMMUNITIES. STORMS SHOULD SLOWLY DIMINISH IN INTENSITY OVERNIGHT...WITH A SLOW PROGRESSION SOUTHWARD. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE OF THUNDERSTORMS SOUTH OF INTERSTATE 80 ON WEDNESDAY. SOME OF THESE STORMS COULD AGAIN BE STRONG TO SEVERE...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS FROM ANY SEVERE STORMS. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTH CENTRAL ILLINOIS SUNDAY AND SUNDAY NIGHT. THUNDERSTORMS ARE ALSO POSSIBLE NORTH OF INTERSTATE 80 ON MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THROUGH TONIGHT...ESPECIALLY IN AREAS NORTH OF INTERSTATE 80. && LMZ740>745-212300- 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- 549 PM CDT TUE MAY 20 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS. A FEW OF THESE THUNDERSTORMS COULD BE SEVERE...PRODUCING WINDS OVER 50 KNOTS AND LARGE HAIL. PATCHY DENSE FOG IS POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE OF THUNDERSTORMS MONDAY. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-212300- 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- 549 PM CDT TUE MAY 20 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS. A FEW OF THESE STORMS COULD BE SEVERE ACROSS THE SOUTHERN THIRD OF THE LAKE...PRODUCING WINDS IN EXCESS OF 50 KNOTS AND LARGE HAIL. AREAS OF DENSE FOG IS POSSIBLE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY. && BEACHLER 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
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
910 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0902 PM HEAVY RAIN WOODRIDGE 41.74N 88.04W
05/20/2014 M2.85 INCH DUPAGE IL TRAINED SPOTTER
TOTAL SO FAR.
&&
BNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
912 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 PM HAIL OAK FOREST 41.61N 87.75W
05/20/2014 E1.00 INCH COOK IL TRAINED SPOTTER
159TH ST AND CENTRAL AVE.
&&
BNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
913 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0912 PM HAIL HOMEWOOD 41.56N 87.66W
05/20/2014 E2.00 INCH COOK IL TRAINED SPOTTER
AT LEAST 2 INCH DIAMETER HAIL
&&
IZZIPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
916 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0905 PM HAIL HOMEWOOD 41.56N 87.66W
05/20/2014 E1.50 INCH COOK IL TRAINED SPOTTER
AT 186TH ST AND DIXIE HWY.
&&
BNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
917 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0910 PM HEAVY RAIN OAK LAWN 41.72N 87.75W
05/20/2014 M0.90 INCH COOK IL TRAINED SPOTTER
RAINFALL IN 45 MINUTES ALONG WITH PEA SIZE HAIL AND 40
MPH WINDS.
&&
BNPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
926 PM CDT TUE MAY 20 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM FLASH FLOOD 1 WSW BURR RIDGE 41.74N 87.94W
05/20/2014 DUPAGE IL BROADCAST MEDIA
FLASH FLOODING ON I-55 NEAR ROUTE 83 LANES IMPASSABLE
&&
IZZIThe Chicago radar (KLOT), 49 km away, was scanning. The volume nearest the first event began at 02:30 UTC.
2 hail, 1 flood, 1 thunderstorm wind. Local standard time, as filed.
Multiple reports of hail up to 1.75 inches in diameter came in from the Munster area.
Quarter size hail was reported near I-80 and Route 41.
Approximately 1.5 feet of standing water was reported in parking lots near 45th Street and Calumet Avenue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Indiana in 2014Every state in 2014This day in weather historyWarnings in Indiana, May 2014
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: 524144, 524145, 524146, 524159.