A heavy rain-producing thunderstorm moved across eastern Keokuk and Washington Counties during the early morning hours of June 27th resulting in some flash flooding.
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The episode as NWS DVN wrote it up.
A heavy rain-producing thunderstorm moved across eastern Keokuk and Washington Counties during the early morning hours of June 27th resulting in some flash flooding.
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 Quad Cities, IA wrote its last area forecast discussion before the first event at Jun 27, 2:40 AM CST, 1 hour 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 340 AM CDT FRI JUN 27 2008 .SYNOPSIS... THUNDERSTORMS HAVE BEGUN ERUPTING OVER PAST COUPLE HOURS ALONG ELEVATED WARM FRONT...AND AXIS OF WEAK PRESSURE FALLS...ROUGHLY FROM KUIN THROUGH KFFL TO KTNU. 07Z MSAS ANALYSIS INDICATED TWO MAIN SURFACE LOWS OVER THE REGION...ONE OVER NORTHEAST SD AND THE OTHER OVER SW KS. IN BETWEEN WAS THE SURFACE COLD FRONT THAT WILL ADVANCE EASTWARD THROUGH THE CWA THIS EVENING AS A VIGOROUS UPPER SHORTWAVE PUSHING INTO SOUTHERN SASK DEEPENS INTO A CLOSED LOW AS IT ADVANCES INTO THE UPPER MS VALLEY EARLY SAT. LIFT AHEAD OF THIS FEATURE...ALONG WITH INCREASING DEEP SHEER AND A HIGH PW AIRMASS WILL CONTINUE LIKELIHOOD OF SEVERAL THUNDERSTORM COMPLEXES WITH THREAT OF HEAVY RAINFALL SECONDARY SEVERE POTENTIAL. && .SHORT TERM...TODAY AND TONIGHT... CURRENT MCS DEVELOPING OVER SW CWA AND NEW CONVECTION DEVELOPING ALONG THE ELEVATED WARM FRONT AHEAD OF AN MCS MOVING INTO NW IA WILL ADVANCE ACROSS THE CWA THIS MORNING. HOW LONG THIS AND ASSOCIATED STABILIZING COOL POOL LINGERS THIS MORNING IN ITS WAKE WILL BE CRITICAL TO SEVERE STORM POTENTIAL AS STRONGER SYNOPTIC LIFT APPROACHES THIS AFTERNOON AND EVENING. OF MORE IMPORTANCE WILL BE HEAVY RAINFALL RATES IN THIS AIRMASS WITH PW VALUES IN EXCESS OF 1.8 INCHES AND H8 DEWPOINTS AROUND 18 DEG C. ALREADY HAVE FLASH FLOOD WATCH OUT FOR ENTIRE CWFA...WITH THE FAR SOUTH AND SW REMAINING MOST VULNERABLE IN NEAR TERM WHERE THUNDERSTORMS ON-GOING AND 6 HOUR FLASH FLOOD GUIDANCE VALUES WELL BELOW 2 INCHES DUE TO RECENT RAIN EVENTS. WITH POTENTIAL FOR AT LEAST ONE OR MORE MCS/S TO ADVANCE ACROSS THE AREA THIS AFTERNOON AND EVENING WITH LOW CONFIDENCE ON TRACK OR HEAVIEST QPF PLACEMENT...HAVE EXTENDED THIS WATCH OUT TO MIDNIGHT TONIGHT. BULK OF THUNDERSTORMS SHOULD SHIFT E AND S OF THE CWFA LATE TONIGHT WITH THE COLD FRONTAL PASSAGE AND PASSING OF THE SHORTWAVE OUT AHEAD OF THE MAIN LOW DROPPING INTO THE UPPER MS VALLEY. HAVE MAINTAINED PREVIOUS FORECAST WITH POPS TRAILING OFF TO SLIGHT CHANCES IN NW AFTER MIDNIGHT...WITH LIKELY CONTINUING IN FAR SE. ..SHEETS.. .LONG TERM...SATURDAY THROUGH NEXT THURSDAY... RETURN TO SEASONABLY MILD CONDITIONS AND MOSTLY DRY THIS WEEKEND INTO EARLY WEEK MAIN FORECAST ISSUE... IGNORING TYPICAL PROBLEMS ALL SOLUTIONS ROUTINELY HAVE WITH SUMMER CONVECTION IN WEAK SHEAR...FORCING WITH HIGH MOISTURE LEVELS. MODELS INITIALIZE AND VERIFY SEASONABLY WELL ON MOST LARGE SCALE FEATURES WITH HI-RES ECMWF AND UKMET USED FIRST 60 HRS WITH MODEST INPUTS FROM 80KM NAM-WRF WHICH IS A BIT TOO MOIST AND GFS WHICH IS A BIT TOO DRY. BEYOND 60 HRS...TRENDED TOWARD MORE CONSISTENT HI-RES ECMWF WITH SOME THERMAL INPUTS FROM GFS/GEFS. SATURDAY...A WARM AND BREEZY DAY AS MOST OF AREA TO BE IN DRY SLOT AFTER FRIDAY NIGHT FRONT SWEEPS THOUGH. THIS WITH HEATING TO ALLOW DEEP MIXING BY MID DAY...RESULTING IN SUPERADIABATIC LAPSE RATES AND LOTS OF MOMENTUM TRANSFER TO SURFACE. BECAUSE OF THIS...HAVE UPPED MAX TEMPERATURES ALL BUT FAR NW. ANALYSIS OF MIXING POTENTIAL SUGGESTS SE 1/2 TO 2/3 OF AREA STILL MAY BE A DEGREE OR TWO TOO COOL AS MIXING TO AOA 800 MB WITH SUGGESTION TO NEAR 700 MB POSSIBLE. SOME WRAP AROUND MOISTURE TO ARRIVE LATE PM IN FAR NW WITH SOME POTENTIAL FOR BRIEF STORMS/SHOWERS IN MID TO LATE PM WITH PEA SIZED HAIL RISK SUGGESTED FROM CAPE AOB 400 J/KG AND LOW WBZ 7-8,000 AGL. PASS FOR LATER SHIFTS TO ASSESS WITH ALSO POTENTIAL FOR SOME GUSTS IN PM IN DRY SLOT TO REACH 30+ MPH. SATURDAY NIGHT AND SUNDAY...LOTS OF LOW LEVEL MOISTURE AND CYCLONIC CONVERGENCE SUPPORTING SHRA AND ISOLATED TSRA SUNDAY PM AS COOLER AIR MOVES IN. MINS TO STAY MAINLY IN LOWER 60S WITH SOME UPPER 50S DUE TO CLOUDS AND PRECIPITATION OVERNIGHT. HIGHS UNDER A MOSTLY CLOUDY SKY UNTIL LATE PM TO STAY MAINLY IN MID TO UPPER 70S WITH A BREEZY NW WIND OF 10 TO 20+ MPH FOR A COOL TO MILD SUMMER DAY. ANY PRECIPITATION THAT DOES FALL TO BE SPOTTY AND LIGHT WITH POPS AOB 30 AS DECENT UPPER LEVEL DEFORMATION ZONE SLIDES EAST. SPRINKLES MAY BE MORE COMMON AND WILL LEAVE FOR LATER SHIFTS TO RECONSIDER. SUNDAY NIGHT THROUGH TUESDAY...MOSTLY FAIR AND QUIET WITH HIGH PRESSURE OVERHEAD TO KEEP REGION DRY WITH SLIGHTLY BELOW NORMAL TEMPERATURES WARMING TO NEAR NORMAL ON TUESDAY. MIN TEMPERATURES MONDAY AM WITH GOOD RADIATIONAL COOLING MAY NEED FURTHER TRIMMING AND ALSO AGAIN TUESDAY AM. HUMIDITIES TO STAY RELATIVELY LOW AS SOUTH WINDS NOT TO KICK IN UNTIL LATE TUESDAY AS SURFACE HIGH MOVES SLOWLY EAST. WEDNESDAY INTO THURSDAY...ANOTHER DECENT UPPER LEVEL TROUGH AND SURFACE FRONT TO PASS WITH ONE OR MORE EPISODES OF STORMS AND SHOWERS. PROGGED SEASONABLE MOISTURE LEVELS...MODERATE INSTABILITY SUGGEST SOME SEVERE AND HEAVY RAINS RISK FOR LATER SHIFTS TO ASSESS. WILL MENTION IN UPCOMING HAZARDOUS WEATHER OUTLOOK. ..NICHOLS.. && .AVIATION... SEVERAL THUNDERSTORM CLUSTERS WILL IMPACT THE REGION IN A VERY MOIST AND UNSTABLE AIRMASS. INITIAL ROUND OF THUNDERSTORMS WILL IMPACT BRL...CID AND MLI BEFORE SUNRISE...AND POSSIBLY REACH DBQ AROUND SUNRISE. THESE WILL DROP CONDITIONS INTO MVFR AND BRIEFLY IFR PRIMELY DUE TO VISIBILITY REDUCTIONS IN HEAVY RAIN. ADDITIONAL THUNDERSTORMS WILL DEVELOP THIS AFTERNOON WITH A POTENTIAL FOR DAMAGING WIND GUSTS AND LARGE HAIL. THUNDERSTORM PROBABILITIES WILL BE KEPT IN 30 PERCENT RANGE WHERE POSSIBLE IN TERMINAL FORECASTS...WITH BETTER COVERAGE THIS EVENING POSSIBLY WARRANTING UPDATE TO TEMPO GROUPS IN NEW FORECASTS. THUNDERSTORMS WILL SHIFT EAST OF THE AREA WITH THE PASSAGE OF THE SURFACE COLD FRONT AFTER MIDNIGHT WITH CONDITIONS PRIMARILY VFR INTO SAT MORNING. ..SHEETS.. && .HYDROLOGY... MODERATE TO MAJOR FLOODING CONTINUES ON MOST AREA RIVERS WITH RIVER LEVELS GENERALLY FALLING FROM LAST COUPLE WEEK RECORD CRESTS. A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING THAT MAY ALLOW FOR SOME HIGHER CRESTS AT LOCATIONS THAT RECEIVE MORE THAN A COUPLE INCHES. SEE LOCAL RIVER FLOOD PRODUCTS AND EXISTING FLASH FLOOD WATCH FOR FURTHER INFORMATION. ..NICHOLS.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...FLASH FLOOD WATCH THROUGH THIS EVENING. IL...FLASH FLOOD WATCH THROUGH THIS EVENING. MO...FLASH FLOOD WATCH THROUGH THIS EVENING. && SHEETS/NICHOLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 500 AM CDT THU JUN 26 2008 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-271100- BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO- CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL- HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA- JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA- MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL- SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL- WASHINGTON IA-WHITESIDE IL- 500 AM CDT THU JUN 26 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST MISSOURI. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WILL END THIS MORNING FOLLOWED BY A PERIOD OF QUIET WEATHER THROUGH EARLY AFTERNOON. LATER THIS AFTERNOON AND TONIGHT...THUNDERSTORMS WILL DEVELOP RAPIDLY AND QUICKLY EVOLVE INTO A LARGE THUNDERSTORM COMPLEX. THE POTENTIAL EXISTS FOR A SIGNIFICANT SEVERE WEATHER OUTBREAK LATE THIS AFTERNOON AND EVENING DUE TO THE EXTREME INSTABILITY THAT DEVELOPS DURING THE DAY. THE PRIMARY THREAT WILL BE DAMAGING WINDS BUT LARGE HAIL WILL ALSO BE POSSIBLE. AFTER SUNSET...THE SEVERE THREAT WILL EVOLVE INTO A HEAVY RAIN THREAT. HOWEVER...ISOLATED SEVERE STORMS WILL STILL BE POSSIBLE LATE TONIGHT. THE AREA MOST AT RISK FOR HEAVY RAINFALL IS ALONG AND NORTH OF INTERSTATE 80. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORMS WITH HEAVY RAIN WILL CONTINUE FRIDAY MORNING BEFORE ENDING. A STRONG COLD FRONT WILL SWEEP THROUGH THE AREA FRIDAY AFTERNOON AND NIGHT ALLOWING A NEW ROUND OF THUNDERSTORMS TO DEVELOP. MULTIPLE THREATS WILL BE POSSIBLE WITH THIS ROUND OF STORMS AND THE POTENTIAL EXISTS FOR ANOTHER SIGNIFICANT SEVERE WEATHER OUTBREAK. SEVERE STORMS WITH DAMAGING WIND AND HAIL ARE EXPECTED FRIDAY AFTERNOON AND EVENING. THE HIGH MOISTURE LEVELS IN THE ATMOSPHERE ALSO INDICATE A THREAT OF HEAVY RAINFALL. ON SATURDAY...LINGERING THUNDERSTORMS WILL BE POSSIBLE DURING THE MORNING WITH ADDITIONAL DEVELOPMENT DURING THE AFTERNOON. CURRENT INFORMATION SUGGESTS THAT THIS ROUND OF STORMS SHOULD NOT BE SEVERE. ON SUNDAY...THERE IS A CHANCE OF THUNDERSTORMS DURING THE AFTERNOON. TUESDAY NIGHT INTO WEDNESDAY...THERE IS A CHANCE OF THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED SEVERAL TIMES FROM THIS AFTERNOON THROUGH FRIDAY EVENING.
The Quad Cities radar (KDVN), 118 km away, was scanning. The volume nearest the first event began at 09:46 UTC.
2 flash flood. Local standard time, as filed.
Truck drivers reported flash flooding of Highway 92 just east of the Washington-Keokuk county line at 4:46 am and 5:08 am June 27. This report was relayed by law enforcement dispatch officials.
Heavy rains resulted in flash flooding in Keota, IA during the early morning hours of June 27. Some homes in Keota reported flooded basements.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2008Every state in 2008This day in weather historyWarnings in Iowa, June 2008
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: 114897, 114902.