A moderately unstable, but weakly sheared atmosphere was in place across the southern Great Lakes. Thunderstorms moved out of Illinois into Indiana, with a few of these storms becoming briefly severe.
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 IWX wrote it up.
A moderately unstable, but weakly sheared atmosphere was in place across the southern Great Lakes. Thunderstorms moved out of Illinois into Indiana, with a few of these storms becoming briefly severe.
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 Northern Indiana wrote its last area forecast discussion before the first event at Aug 25, 1:28 PM EST, 1 hour 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTHERN INDIANA 228 PM EDT MON AUG 25 2014 .SYNOPSIS... ISSUED AT 1056 AM EDT MON AUG 25 2014 HOT AND MUGGY CONDITIONS ACROSS THE REGION TODAY INTO TONIGHT. DEWPOINTS IN THE LOWER 70S WILL CREATE MUGGY CONDITIONS AS HIGH PRESSURE RETAINS ITS INFLUENCE OVER US. A FRONTAL SYSTEM TO THE WEST COULD INTRODUCE SOME RAIN TO THE NORTHERN PORTION OF THE REGION TONIGHT AS IT APPROACHES. HIGH TEMPERATURES TODAY WILL BE IN THE UPPER 80S TO AROUND 90 WITH THE HEAT INDEX IN THE 90S TO NEAR 100. LOW TEMPERATURES TONIGHT WILL RANGE FROM THE UPPER 60S NEAR THE OHIO RIVER TO THE LOWER 70S IN SOUTHERN MICHIGAN. && .UPDATE... ISSUED AT 1242 PM EDT MON AUG 25 2014 FOCUS FOR THE REMAINDER OF THE AFTERNOON WILL CENTER ON CONVECTIVE POTENTIAL AND HEAT. RESIDUAL OUTFLOW BOUNDARY FROM UPSTREAM CONVECTION HAS ALLOWED FOR RENEWED THUNDERSTORM DEVELOPMENT ACROSS NORTHEAST ILLINOIS. REMNANT OUTFLOW/CONVECTIVE VORT FROM UPSTREAM CONVECTION WILL HAVE PLENTY OF DOWNSTREAM INSTABILITY TO WORK THIS AFTERNOON WITH INDICATIONS IN RUC SHORT TERM PROGS OF 3-4K J/KG OF 100 HPA MLCAPES WORKING INTO WESTERN PORTIONS OF THE AREA. DEEP LAYER SHEAR IS WEAK...BUT GIVEN MAGNITUDE OF INSTABILITY WILL HAVE TO MONITOR FOR POSSIBILITY OF ISOLATED STRONG/SEVERE STORMS THIS AFTERNOON. WITH EARLY AFTERNOON UPDATE...WILL GO AHEAD AND MAKE SOME SOUTHEAST EXPANSION OF SLIGHT CHANCE AND PERHAPS RAISE POPS A BIT IN THE FAR NORTHWEST DUE TO APPROACH OF OUTFLOW BOUNDARY. TEMPERATURES/DEW POINTS APPEAR TO BE IN GOOD SHAPE WITH PEAK AFTERNOON HEAT INDICES STILL LIKELY TO REACH INTO THE UPPER 90S ACROSS THE WEST. WILL CONTINUE TO GO WITH CURRENT SPS FOR THIS AFTERNOON TO HIGHLIGHT HAZARDOUS CONDITIONS ASSOCIATED WITH THE HEAT/HUMIDITY. && .SHORT TERM...(TODAY AND TONIGHT) ISSUED AT 404 AM EDT MON AUG 25 2014 FOCUS OF PERIOD WILL BE TWO FOLD...TEMPERATURES/HEAT INDEX ISSUES AND CHANCES FOR STORMS. WARM AND MUGGY CONDITIONS WERE IN PLACE ACROSS THE AREA WITH TEMPERATURES IN THE 70S AND DEWPOINTS IN THE UPPER 60S NE TO LOWER 70S SW WITH MOST UNSTABLE CAPE VALUES IN THE 500 TO 1500 J/KG RANGE. WITH NO REAL TRIGGER ACROSS THE AREA NO SHOWERS/STORMS HAVE FORMED THUS FAR. MAIN FOCUS FOR STORMS HAS BEEN FROM NORTHERN WISCONSIN INTO PORTIONS OF CENTRAL IOWA WHERE 30 TO 35 KT LOW LEVEL JET WAS AIDING IN DEVELOPMENT AND MAINTENANCE OF A BROKEN LINE OF STRONG TO LOCALLY SEVERE STORMS. HI RES MODELS ALL SUGGEST THIS LINE WILL DROP SLOWLY SOUTHEAST BUT VARY IN HOW MUCH HOLD TOGETHER AS WE APPROACH 12Z MON AND POINTS BEYOND. WOULD SEEM REASONABLE THAT SOME SORT OF OUTFLOW BOUNDARY OR REMNANT SHOWERS/STORMS COULD APPROACH NW AREAS THIS AFTERNOON AND THEN STALL SOMEWHERE TONIGHT BEING REINFORCED SOMEWHAT BY SFC FRONT THAT WILL BE SINKING SOUTH. ONLY CHANGE TO GRIDS WILL BE REORIENTATION OF SLGT CHC POPS TO MORE OF A SW TO NE ORIENTATION. IF SUFFICIENT HEATING TAKES PLACE AND PROGGED INSTABILITY IS AVAILABLE (SURFACE BASED CAPES IN EXCESS OF 4000 J/KG IN A WEAKLY SHEAR ENVIRONMENT) THEN SOME STRONGER STORMS COULD BE A CONCERN. NOW FOR TEMPERATURES...THE WARM START TO THE MORNING SHOULD ALLOW TEMPERATURES TO QUICKLY CLIMB INTO THE 80S BY NOON TIME AND POSSIBLY CLOSE TO 90 IN WESTERN AREAS. DEWPOINTS IN WESTERN AREAS LOOK TO CLIMB INTO THE MIDDLE 70S IN SOME SPOTS WHICH IF TEMPS DO APPROACH 90 WILL EDGE REAL CLOSE TO HEAT ADVISORY LEVELS (EVEN BRIEFLY TOUCH IN FAR WEST). WILL HANDLE WITH HWO AND SPS FOR NOW AND LET DAY SHIFT ASSESS THINGS AFTER SUNRISE AS TO EXTENT OF CLOUD COVER AND POSSIBLE INFLUENCE FROM UPSTREAM CONVECTION. LOWS TONIGHT WILL DROP BACK INTO THE UPR 60S TO LOWER 70S. && .LONG TERM...(TUESDAY THROUGH SUNDAY) ISSUED AT 404 AM EDT MON AUG 25 2014 LOW OVER SRN MANITOBA THIS MORNING EXPECTED TO LIFT NE INTO QUEBEC TUESDAY WITH TRAILING CDFNT MOVG INTO OUR CWA. WK FORCING ALONG THE FRONT COMBINED WITH SOME CAPPING ASSOCIATED WITH UPR RIDGE OVER THE OH/MID MS VALLEY LIMITS TSTM POTENTIAL TO CHC DESPITE AT LEAST MODERATE INSTABILITY IN PLACE OVER THE AREA. TEMPS WILL REMAIN ABOVE NORMAL WITH HIGHS IN THE UPPER 80S AND PM HEAT INDEX READINGS IN THE 90S. CDFNT EXPECTED TO SAG SOUTH INTO CENTRAL OH/IN TUE NGT. POTENTIAL FOR TSTMS INCREASES A BIT IN THIS TIMEFRAME AS A SHRTWV CURRENTLY OVER WRN CANADA MOVES TO THE UPR GRTLKS RESULTING IN MINOR HEIGHT FALLS AS FAR SOUTH AS OUR CWA. WK CAA SHOULD ALLOW FOR LOWS TO FALL INTO THE M-U60S ACROSS THE AREA. RAIN CHANCES DIMINISH WED-WED NGT AS FRONT CONTS TO SAG SOUTH TO THE OH VALLEY AND SFC HIGH MOVES ESE INTO THE UPR GRTLKS. TEMPS SHOULD FALL BACK CLOSER TO NORMAL WITH HIGHS IN THE L80S AND LOWS IN THE L-M60S. FRONTAL SYSTEM EXPECTED TO LIFT BACK NORTH INTO OUR AREA THU-THU NGT AS SFC HIGH MOVES TO THE MID ATLANTIC/NORTHEAST U.S.. DVLPG SPLIT FLOW CUT-OFF LOW OVER THE WRN U.S. BY MID WEEK IS EXPECTED TO MOVE SLOWLY EAST TO THE CENTRAL PLAINS FRIDAY AND INTO THE MID MS VALLEY BY SUNDAY WHILE SFC BOUNDARY LINGERS OVER THE AREA... ENHANCING TSTM POTENTIAL ACROSS OUR AREA OVER THE LABOR DAY WEEKEND... WHILE TEMPS REMAIN CLOSE TO NORMAL. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 200 PM EDT MON AUG 25 2014 AN OUTFLOW BOUNDARY ASSOCIATED WITH OVERNIGHT UPSTREAM CONVECTION HAS BEEN A TRIGGER MECHANISM FOR SHOWERS AND THUNDERSTORMS ACROSS NORTHEAST ILLINOIS AND SOUTHERN LOWER MICHIGAN. THIS BOUNDARY SHOULD CONTINUE TO DROP INTO NORTH CENTRAL INDIANA BY 20Z. A STRONGLY UNSTABLE ENVIRONMENT EXISTS ACROSS THE AREA...WITH MAIN NEGATIVE FACTOR TO SOUTHEAST EXPANSION OF THE SHOWERS AND STORMS IS BACKGROUND WEAK UPPER FORCING AND PRESENCE OF MID/UPPER LEVEL RIDGING. HAVE CARRIED A VCTS MENTION AT KSBN FROM 20Z-22Z AND WILL BE MONITORING TRENDS OVER NEXT HOUR OR SO FOR POSSIBLE TSRA INCLUSION. SOUTH WINDS AT KSBN MAY BECOME NORTHWEST FOR A TIME IN THE 20Z-22Z TIMEFRAME DUE TO THE PASSAGE OF THE OUTFLOW BOUNDARY...OR VARIABLE IN NATURE. A SHEARED UPPER VORT MAX FROM CENTRAL WISCONSIN INTO EASTERN IOWA WILL TRACK INTO NORTHWEST INDIANA THIS EVENING WITH SOME POSSIBILITY OF ADDITIONAL ISOLATED THUNDERSTORMS. OTHER THAN PASSAGE OF THIS WEAK WAVE THIS EVENING...FORCING WILL BE SOMEWHAT WEAK WITH LOW CONFIDENCE IN TIMING AND WILL KEEP TAFS DRY THROUGH THE END OF THE PERIOD. CHANCES OF THUNDER MAY INCREASE LATE TONIGHT INTO TUESDAY MORNING AS LOW LEVEL FRONT BEGINS TO APPROACH THE AREA...BUT CONFIDENCE REMAINS LOW IN TIMING/COVERAGE. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...NONE. MI...NONE. OH...NONE. LM...NONE. && UPDATE...MARSILI SYNOPSIS...LOTHAMER SHORT TERM...FISHER LONG TERM...JT AVIATION...MARSILI VISIT US AT WWW.WEATHER.GOV/IWX (ALL LOWER CASE) FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT: WWW.FACEBOOK.COM/NWSNORTHERNINDIANA WWW.TWITTER.COM/NWSIWX WWW.YOUTUBE.COM/NWSNORTHERNINDIANA
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORTHERN INDIANA 501 AM EDT MON AUG 25 2014 INZ003>009-012>018-020-022>027-032>034-MIZ077>081-OHZ001-002-004-005- 015-016-024-025-260915- LA PORTE-ST. JOSEPH IN-ELKHART-LAGRANGE-STEUBEN-NOBLE-DE KALB-STARKE- PULASKI-MARSHALL-FULTON IN-KOSCIUSKO-WHITLEY-ALLEN IN-WHITE-CASS IN- MIAMI-WABASH-HUNTINGTON-WELLS-ADAMS-GRANT-BLACKFORD-JAY-BERRIEN- CASS MI-ST. JOSEPH MI-BRANCH-HILLSDALE-WILLIAMS-FULTON OH-DEFIANCE- HENRY-PAULDING-PUTNAM-VAN WERT-ALLEN OH- INCLUDING THE CITIES OF...MICHIGAN CITY...LA PORTE...SOUTH BEND... MISHAWAKA...ELKHART...GOSHEN...LAGRANGE...TOPEKA...ANGOLA... KENDALLVILLE...LIGONIER...AUBURN...GARRETT...KNOX...NORTH JUDSON... WINAMAC...FRANCESVILLE...PLYMOUTH...BREMEN...ROCHESTER...WARSAW... WINONA LAKE...COLUMBIA CITY...SOUTH WHITLEY...FORT WAYNE... MONTICELLO...BROOKSTON...LOGANSPORT...PERU...WABASH... NORTH MANCHESTER...HUNTINGTON...BLUFFTON...OSSIAN...DECATUR... BERNE...MARION...HARTFORD CITY...MONTPELIER...PORTLAND...NILES... BENTON HARBOR...ST. JOSEPH...BUCHANAN...DOWAGIAC...CASSOPOLIS... STURGIS...THREE RIVERS...COLDWATER...HILLSDALE...BRYAN...WAUSEON... ARCHBOLD...DEFIANCE...NAPOLEON...PAULDING...ANTWERP...OTTAWA... PANDORA...VAN WERT...DELPHOS...LIMA 501 AM EDT MON AUG 25 2014 /401 AM CDT MON AUG 25 2014/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OHIO... NORTHERN INDIANA AND SOUTHWEST LOWER MICHIGAN. .DAY ONE...TODAY AND TONIGHT HOT AND HUMID CONDITIONS ARE EXPECTED THIS AFTERNOON. PEAK AFTERNOON HEAT INDICES ARE EXPECTED TO RANGE FROM THE MIDDLE 90S TO NEAR 100 WITH THE HIGHEST VALUES GENERALLY SOUTHWEST OF A NEW BUFFALO TO ROCHESTER LINE. THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND TONIGHT. HEAVY RAINFALL WILL POSE THE GREATEST THREAT. AN ISOLATED STRONG TO LOCALLY SEVERE THUNDERSTORM CAPABLE OF GUSTY WINDS CANNOT BE RULED OUT ESPECIALLY NORTHWEST OF A MONTICELLO TO WARSAW TO STURGIS LINE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY HOT AND HUMID CONDITIONS ARE LIKELY TUESDAY. PEAK AFTERNOON HEAT INDICES ARE EXPECTED TO REACH INTO THE LOWER TO MIDDLE 90S...WITH UPPER 90S POSSIBLE ACROSS NORTHWEST INDIANA EXTENDING INTO PORTIONS OF NORTH CENTRAL INDIANA. THERE IS A CHANCE OF THUNDERSTORMS THROUGH MUCH OF THIS PERIOD. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME... HOWEVER... LOCALLY HEAVY RAINFALL IS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX LMZ043-046-260915- NEW BUFFALO MI TO ST JOSEPH MI-MICHIGAN CITY IN TO NEW BUFFALO MI- 501 AM EDT MON AUG 25 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF SOUTHEASTERN LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND TONIGHT. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME... HOWEVER... HIGHER WINDS AND WAVES ARE POSSIBLE IN AND NEAR THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE OF THUNDERSTORMS THROUGH MUCH OF THIS PERIOD. SEVERE STORMS ARE NOT EXPECTED AT THIS TIME... HOWEVER... HIGHER WINDS AND WAVES ARE POSSIBLE IN AND NEAR THUNDERSTORMS. && STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER DETAILS OR UPDATES...OR CHECK OUR WEB SITE AT WEATHER.GOV/IWX/?N=MARINE
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
323 PM EDT MON AUG 25 2014
INZ003>005-012-014-MIZ077-078-252015-
BERRIEN MI-CASS MI-ELKHART IN-LA PORTE IN-MARSHALL IN-ST. JOSEPH
IN-STARKE IN-
323 PM EDT MON AUG 25 2014
...STRONG THUNDERSTORMS MOVING TOWARD CASS...EXTREME NORTHWESTERN ST.
JOSEPH...SOUTHERN BERRIEN...NORTHWESTERN MARSHALL...LA PORTE...ST.
JOSEPH...NORTHWESTERN ELKHART AND NORTHERN STARKE COUNTIES...
AT 320 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS FROM NEAR DOWAGIAC MICHIGAN TO LAPORTE
INDIANA...MOVING EAST AT 20 MPH.
ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO
GROUND LIGHTNING AND BRIEF HEAVY DOWNPOURS ARE POSSIBLE WITH THESE
STORMS. ISOLATED SEVERE THUNDERSTORMS WITH BRIEF DOWNBURST WINDS ARE
POSSIBLE THIS AFTERNOON SO LISTEN FOR POSSIBLE WARNINGS.
LOCATIONS IN THE PATH OF THIS STORM INCLUDE...
BUCHANAN...
PLYMOUTH...
SOUTH BEND...GEORGETOWN AND PLYMOUTH...
HAMLET...
NEW CARLISLE...
WALKERTON AND KOONTZ LAKE...
THIS INCLUDES INTERSTATE 80 90 IN INDIANA BETWEEN MILE MARKERS 46 AND
91.
GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES.
SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
LAT...LON 4178 8673 4181 8656 4207 8608 4207 8576
4133 8622 4126 8693
TIME...MOT...LOC 1920Z 274DEG 18KT 4173 8663
SLLThe Northern Indiana radar (KIWX), 47 km away, was scanning. The volume nearest the first event began at 20:11 UTC.
3 thunderstorm wind. Local standard time, as filed.
Local media reported large tree limbs were blown down in the town of Osceola.
Emergency management officials reported a two foot diameter tree was snapped off at the ground by strong winds.
Emergency management officials reported several trees down across the town. The entire town was without power. Local officials measured a 66 mph wind gusts.
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, August 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: 540429, 540428, 540430.