Three trees were blown down five miles northeast of Cedar Springs by high non thunderstorm wind gusts.
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The episode as NWS GRR wrote it up.
Three trees were blown down five miles northeast of Cedar Springs by high non thunderstorm wind gusts.
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 Grand Rapids, MI wrote its last area forecast discussion before the first event at Aug 20, 3:17 AM EST, 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 417 AM EDT MON AUG 20 2007 LATEST UPDATE...ALL SECTIONS EXCEPT AVIATION... .SYNOPSIS...(417 AM EDT MON AUG 20 2007) A STALLED OUT FRONTAL SYSTEM REMAINS IN PLACE WELL SOUTH OF LOWER MICHIGAN...STRETCHING FROM IOWA THROUGH OHIO. A WAVE OF SHOWERS AND EMBEDDED THUNDERSTORMS MOVING THROUGH THE AREA EARLY THIS MORNING WILL PASS EAST OF THE AREA BY MIDDAY TODAY. THE FRONT IS EXPECTED TO REMAIN IN THE REGION THROUGH THE END OF THE WORK WEEK. THIS WILL KEEP A POTENTIAL OF SHOWERS AND THUNDERSTORMS IN OVER THE AREA THROUGH THE WEEK. TEMPERATURES WILL WARM TOWARD MIDWEEK AS WARMER AIR IS ABLE TO SPREAD ACROSS THE AREA. && .SHORT TERM... (417 AM EDT MON AUG 20 2007) LATEST SFC ANALYSIS SHOWS THE STALLED OUT FRONT EXTENDING FROM ERN IA...THROUGH KIND...AND THEN EAST TO THE ATLANTIC COAST. SHOWERS AND THUDNERSTORMS CONTINUE TO DEVELOP ALONG IT...AND THE ELEVATED FRONT ROUGHLY ALONG A LINE FROM CHICAGO TO TOLEDO. A SHORT WAVE CAN BE SEEN IN RADAR IMAGERY APPROACHING THE KORD-KMKE CORRIDOR AS OF 0730Z. THIS WAVE IS ENHANCING THE COVERAGE AND INTENSITY OF THE PCPN OVER SRN LAKE MICHIGAN...NW IN..AND SW LOWER MI. EXTRAPOLATING THIS FEATURE TO THE EAST HAS IT EXITING THE FAR ERN SECTION OF THE CWFA BETWEEN 12Z AND 13Z. WE WILL CARRY CATEGORICAL POPS EVERYWHERE FOR THE FIRST FEW HOURS OF THE FORECAST TO ACCOUNT FOR THIS FEATURE. THUNDER REMAINS POSSIBLE ROUGHLY SOUTH OF A HOLLAND TO LANSING LINE WHERE THE BEST ELEVATED INSTABILITY RESIDES. LIGHTNING IS HAVING A SOMEWHAT DIFFICULT TIME MOVING NORTH WITH THE MORE STABLE AIR MASS IN PLACE. THERE WILL BE A DIMINISHING TREND IN THE PCPN FOR A PERIOD FROM MID MORNING THROUGH A PORTION OF THE AFTERNOON. LATER THIS AFTERNOON... THE REMNANTS OF ERIN AND ITS ASSOCIATED LLJ WILL BEGIN TO MERGE WITH THE SFC FRONT AND ALLOW FOR AN INCREASE IN PCPN ALONG AND JUST NORTH OF THE FRONT AS THE DEEP MOISTURE ASSOCIATED WITH IT ADVECTS NORTHEAST. THE TRENDS OF THE MODELS CONTINUE TO KEEP THE BULK OF THIS ACTIVITY JUST SOUTH OF THE CWFA OVER THE NRN PORTIONS OF IN. SOME PCPN IS LIKELY ALONG THE SRN ROW OF COUNTIES...WITH LESS POTENTIAL AS YOU HEAD NORTH. ONCE THE REMNANTS OF ERIN PASS WELL EAST OF THE AREA BY LATE MON NIGHT...THE FRONT LOOKS TO BECOME LESS ACTIVE NEAR THE IMMEDIATE AREA. CONVECTIVE ACTIVITY WILL INCREASE OVER THE PLAINS STATES ALONG THE FRONT AS A NRN STREAM WAVE DIVES IN THERE. THIS WILL PUT LOWER MI INTO A RELATIVE QUIET SPOT. WE HAVE NOT REMOVED POPS ALL TOGETHER AS THE MODELS HAVE NOT BEEN HANDLING THE PCPN NEAR THIS FRONT GREAT AND THERE IS THE POTENTIAL THAT SOMETHING COULD DEVELOP ALONG THE FRONT. THE FRONT IS THEN EXPECTED TO MAKE A SURGE TO THE NORTH LATE ON TUE AND TUE NIGHT AS YET ANOTHER NRN STREAM WAVE MOVES ACROSS THE PLAINS AND THEN UP INTO ONTARIO. THIS WAVE IS EXPECTED TO FIRE CONVECTION ALONG AND JUST NORTH OF THE FRONT...FROM THE CENTRAL PLAINS TO THE UPPER GREAT LAKES. THE BEST POTENTIAL OF PCPN LOOKS TO REMAIN NORTH OF THE CWFA. THE WARM FRONT MOVING NORTH OF THE AREA WILL ALLOW LOWER MI TO GET INTO THE WARM SECTOR. H850 TEMPS APPROACHING 20C WILL ALLOW SFC TEMPS TO MAX OUT AROUND 90 ON WED. PCPN POTENTIAL LOOKS RATHER LIMITED DOWN HERE WITH THE MAIN ACTIVITY NORTH OF THE AREA WITH THE SHORT WAVES AND SFC WAVES. WITH THE FRONT IN THE AREA HOWEVER...WE WILL KEEP A LOW CHC POP IN FOR THE TIME BEING. && .LONG TERM... (417 AM EDT MON AUG 20 2007) THE THURSDAY THROUGH SATURDAY PERIOD WILL FEATURE A BROAD LOW AMPLITUDE H5 LONGWAVE TROUGH OVER THE NRN ROCKIES AND NRN PLAINS... WHICH EVENTUALLY TRANSLATES EAST INTO THE GREAT LAKES REGION BY SATURDAY. THIS PLACES SW MI IN AN AREA OF PERSISTENT/FREQUENT PVA (I.E. ACTIVE WX)... UNTIL THE TROUGH PASSES LATE SATURDAY. IMPULSES/SHORTWAVES TRAVELING THROUGH THE SW FLOW ALOFT WILL INTERACT WITH BAROCLINIC ZONE WHICH WILL EXTEND FROM MI SW INTO THE CENTRAL PLAINS. ALTHOUGH ITS NOT EXPECTED TO RAIN ALL THE TIME... THIS SETUP WILL OFFER SEVERAL OPPORTUNITIES FOR ROUNDS OF SHOWERS AND TSTMS AS THE SURFACE BOUNDARY WAVERS OVER THE AREA. IT LOOKS AS THOUGH THE AIR MASS WILL BE SUFFICIENTLY MOIST AND UNSTABLE TO SUPPORT THE POSSIBILITY OF HEAVY RAIN AND PERHAPS SOME SEVERE WX. ATTM THE FRONTAL BOUNDARY IS EXPECTED TO FINALLY CLEAR THE AREA TO THE SOUTHEAST LATE SATURDAY AS A COLD FRONT...WITH HIGH PRESSURE AND DRY WEATHER BUILDING IN FOR NEXT SUNDAY AND MONDAY. && .AVIATION...(235 AM EDT MON AUG 20 2007) WIDESPREAD SHOWERS OVERNIGHT INTO MONDAY MORNING SHOULD BECOME LIGHTER AND MORE SCATTERED IN NATURE BY MONDAY AFTERNOON AS THE LOW LEVEL JET LEANS OVER INTO THE OHIO VALLEY. IFR CONDITIONS WILL PREVAIL THROUGH ABOUT 15Z WITH ONLY SOME SLIGHT IMPROVEMENT POSSIBLE THEREAFTER. SCTD TSTMS ON THE NOSE OF THE LOW LEVEL JET WILL AFFECT THE I-94 CORRIDOR INCLUDING AZO/BTL/JXN FROM ROUGHLY 08Z TO 12Z. && .MARINE... (417 AM EDT MON AUG 20 2007) WITH THE STALLED OUT FRONTAL SYSTEM LOCATED TO OUR SOUTH AND EXPECTED TO REMAIN THERE UNTIL LATE IN THE DAY ON TUESDAY...EAST TO SOUTHEAST WINDS CAN BE EXPECTED TO PERSIST. WIND SPEEDS OF GENERALLY 10 TO 20 KNOTS CAN ALSO BE EXPECTED TO PERSIST THROUGH TONIGHT WITH A DECENT PRESSURE GRADIENT IN PLACE NORTH OF THE FRONT. THE OFFSHORE FETCH WILL KEEP WAVES DOWN BELOW SMALL CRAFT ADVISORY CRITERIA. WINDS WILL THEN SHIFT TO THE SOUTH AS THE WARM FRONT MOVES THROUGH LATE TUESDAY. && .HYDROLOGY... (417 AM EDT MON AUG 20 2007) SHOWERS AND EMBEDDED THUNDERSTORMS WILL CONTINUE ACROSS THE AREA THROUGH MID MORNING...BEFORE DIMINISHING AS THE LOW LEVEL JET MOVES EAST OF THE AREA. PRECIPITABLE WATERS AROUND AND A TAD OVER 2 INCHES OVER THE AREA WILL ALLOW FOR A FEW HEAVY DOWNPOURS OUT OF ANY HEAVIER SHOWER OR EMBEDDED THUNDERSTORM. WE DO NOT ANTICIPATE THIS BEING A PROBLEM AS TRAINING OF ECHOES IS NOT REALLY OCCURRING AND THE RAINFALL SHOULD DIMINISH BY MID MORNING. THE HEAVIEST RAINFALL THEN FOR LATER TODAY AND TONIGHT SHOULD REMAIN SOUTH OF THE AREA. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...NONE. LM...NONE. && SYNOPSIS: NJJ SHORT TERM: NJJ LONG TERM: MEADE AVIATION: MEADE MARINE: NJJ HYDROLOGY: NJJ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1212 PM EDT SUN AUG 19 2007 MIZ037>040-043>046-050>052-056>059-064>067-071>074-201045- MASON-LAKE-OSCEOLA-CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON- MONTCALM-GRATIOT-OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON- INGHAM-VAN BUREN-KALAMAZOO-CALHOUN-JACKSON- 1212 PM EDT SUN AUG 19 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT THE THREAT FOR HEAVY RAINFALL HAS DIMINISHED OVER THE GRAND RAPIDS COUNTY WARNING AREA. THE BAND OF HEAVY RAIN AND THUNDERSTORMS HAS SLIPPED SOUTH OF LOWER MICHIGAN AS OF NOON. HOWEVER WE STILL DO EXPECT OCCASIONAL RAIN SHOWERS ACROSS MOST OF THE GRAND RAPIDS COUNTY WARNING AREA THROUGH THE AFTERNOON. THERE IS A RISK OF A THUNDERSTORM NEAR AND SOUTH OF INTERSTATE 94 THIS AFTERNOON BUT IT IS A LIMITED RISK AT BEST. FOR THE MOST PART THE THUNDERSTORMS AND HEAVY RAIN SHOWERS WILL STAY SOUTH OF INTERSTATE 94 THROUGH TONIGHT. THE HEAVY RAIN BAND SHOULD SLIP EVER FARTHER SOUTH TONIGHT... SO ONLY AREAS SOUTH OF INTERSTATE 96 SHOULD SEE ANY SIGNIFICANT RAINFALL TONIGHT. EVEN THERE...THE GREATEST RAINFALL WILL BE WELL SOUTH OF INTESTATE 94. AGAIN THE THUNDERSTORM THREAT WILL BE FOR THE MOST PART SOUTH OF INTERSTATE 94. WHILE THE HEAVY RAINFALL HAS ENDED THERE STILL WAS HEAVY RAINFALL SOUTH OF A LINE FROM SOUTH HAVEN TO ALBION EARLY THIS MORNING. IN THOSE AREAS WATER IS STILL RUNNING OFF INTO SMALL STREAMS AND RIVERS. SOME OF THE SMALLER STREAMS MAY BE CLOSE TO BANK FULL INTO MID AFTERNOON. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE EACH DAY FROM TUESDAY THROUGH SATURDAY AS AN ACTIVE FRONTAL BOUNDARY REMAINS IN THE AREA. LOCALLY HEAVY RAINFALL WILL CONTINUE TO BE A THREAT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. LMZ844>849-201045- ST JOSEPH TO SOUTH HAVEN-SOUTH HAVEN TO HOLLAND- HOLLAND TO GRAND HAVEN-GRAND HAVEN TO WHITEHALL- WHITEHALL TO PENTWATER-PENTWATER TO MANISTEE- 1212 PM EDT SUN AUG 19 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT A FEW THUNDERSTORMS ARE POSSIBLE SOUTH OF SOUTH HAVEN THROUGH TONIGHT. SEVERE WEATHER IS NOT EXPECTED... ALTHOUGH VISIBILITIES MAY BE GREATLY REDUCED IN AREAS OF HEAVY RAIN. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ARE POSSIBLE EACH DAY FROM TUESDAY THROUGH SATURDAY AS AN ACTIVE FRONTAL BOUNDARY REMAINS IN THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. MEADE WDM
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
A trained spotter reported that three trees were blown down five miles northeast of Cedar Springs by high non thunderstorm wind gusts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2007Every state in 2007This day in weather historyWarnings in Michigan, August 2007
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: 56653.