hazardous weather flooding. ohio ema hazardous weather course most deadly severe weather... 146**...

Hazardous WeatherHazardous WeatherFloodingFlooding

Ohio EMA Hazardous Weather CourseOhio EMA Hazardous Weather Course

Most Deadly Severe Weather...Most Deadly Severe Weather...

146** deaths between 1955 and 2007 in Ohio 146** deaths between 1955 and 2007 in Ohio (Annual Average ~4)(Annual Average ~4)


Inland flooding from hurricane/tropical Inland flooding from hurricane/tropical cyclonescyclones

Not common in Ohio, but can happenNot common in Ohio, but can happen• Opal 1995Opal 1995• Fran/Dean 1995Fran/Dean 1995• Isador 2003Isador 2003• Frances/Ivan 2004Frances/Ivan 2004• August 2007 (Old TS Erin Remnants)August 2007 (Old TS Erin Remnants)


Northern Ohio Flood Northern Ohio Flood TragedyTragedy


Types of FloodingTypes of FloodingFlash Flooding Flash Flooding (Flash Flood Warning)(Flash Flood Warning)• RAPID rises on small streams and low areas RAPID rises on small streams and low areas

• Intense local rainfall overwhelms a small river basin or Intense local rainfall overwhelms a small river basin or storm sewer capabilitiesstorm sewer capabilities

• Requires immediate action in the warned locationRequires immediate action in the warned location

Small Stream Flooding Small Stream Flooding (Flood Warning)(Flood Warning)• Rises are not as rapid, usually lesser rainfall or rainfall over Rises are not as rapid, usually lesser rainfall or rainfall over

a long period of timea long period of time

• This flooding CAN still be deadly IF people make bad This flooding CAN still be deadly IF people make bad decisions!decisions!

River Flooding River Flooding (Flood Warning)(Flood Warning)• Flooding on larger rivers and streamsFlooding on larger rivers and streams

• Issued for specific forecast locationsIssued for specific forecast locations


Flood vs. Flash Flood Watch(?)Flood vs. Flash Flood Watch(?)OHZ003-006>009-017>019-027>031-036>038-047-180415-OHZ003-006>009-017>019-027>031-036>038-047-180415-/O.NEW.KCLE.FF.A.0003.080318T0600Z-080319T2000Z//O.NEW.KCLE.FF.A.0003.080318T0600Z-080319T2000Z//00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO//00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/LUCAS-WOOD-OTTAWA-SANDUSKY-ERIE OH-HANCOCK-SENECA-HURON-WYANDOT-LUCAS-WOOD-OTTAWA-SANDUSKY-ERIE OH-HANCOCK-SENECA-HURON-WYANDOT-CRAWFORD-RICHLAND-ASHLAND-WAYNE-MARION-MORROW-HOLMES-KNOX-CRAWFORD-RICHLAND-ASHLAND-WAYNE-MARION-MORROW-HOLMES-KNOX-INCLUDING THE CITIES OF...TOLEDO...BOWLING GREEN...PORT CLINTON...INCLUDING THE CITIES OF...TOLEDO...BOWLING GREEN...PORT CLINTON...FREMONT...SANDUSKY...FINDLAY...TIFFIN...NORWALK...FREMONT...SANDUSKY...FINDLAY...TIFFIN...NORWALK...UPPER SANDUSKY...CAREY...BUCYRUS...MANSFIELD...ASHLAND...UPPER SANDUSKY...CAREY...BUCYRUS...MANSFIELD...ASHLAND...WOOSTER...MARION...MOUNT GILEAD...MILLERSBURG...MOUNT VERNONWOOSTER...MARION...MOUNT GILEAD...MILLERSBURG...MOUNT VERNON409 PM EDT MON MAR 17 2008409 PM EDT MON MAR 17 2008

...FLASH FLOOD WATCH IN EFFECT FROM 2 AM EDT TUESDAY THROUGH TUESDAY...FLASH FLOOD WATCH IN EFFECT FROM 2 AM EDT TUESDAY THROUGH TUESDAYAFTERNOON...AFTERNOON...

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED ATHE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF NORTH CENTRAL OHIO...NORTHEAST * FLASH FLOOD WATCH FOR PORTIONS OF NORTH CENTRAL OHIO...NORTHEAST OHIO AND NORTHWEST OHIO...INCLUDING THE FOLLOWING AREAS...IN OHIO AND NORTHWEST OHIO...INCLUDING THE FOLLOWING AREAS...IN NORTH CENTRAL OHIO...ASHLAND...CRAWFORD...ERIE OH...HURON...NORTH CENTRAL OHIO...ASHLAND...CRAWFORD...ERIE OH...HURON... KNOX...MARION...MORROW AND RICHLAND. IN NORTHEAST OHIO...KNOX...MARION...MORROW AND RICHLAND. IN NORTHEAST OHIO... HOLMES AND WAYNE. IN NORTHWEST OHIO...HANCOCK...LUCAS...HOLMES AND WAYNE. IN NORTHWEST OHIO...HANCOCK...LUCAS... OTTAWA...SANDUSKY...SENECA...WOOD AND WYANDOT.OTTAWA...SANDUSKY...SENECA...WOOD AND WYANDOT.

* FROM 2 AM EDT TUESDAY THROUGH TUESDAY AFTERNOON* FROM 2 AM EDT TUESDAY THROUGH TUESDAY AFTERNOON

* SHOWERS AND THUNDERSTORMS ARE EXPECTED TO SPREAD ACROSS THE AREA* SHOWERS AND THUNDERSTORMS ARE EXPECTED TO SPREAD ACROSS THE AREA THIS EVENING AS A STRONG AREA OF LOW PRESSURE SLOWLY MOVES FROMTHIS EVENING AS A STRONG AREA OF LOW PRESSURE SLOWLY MOVES FROM THE SOUTHERN PLAINS TOWARD THE OHIO VALLEY. WIDESPREAD SHOWERSTHE SOUTHERN PLAINS TOWARD THE OHIO VALLEY. WIDESPREAD SHOWERS AND THUNDERSTORMS PRODUCING LOCALLY HEAVY RAINFALL WILL CONTINUEAND THUNDERSTORMS PRODUCING LOCALLY HEAVY RAINFALL WILL CONTINUE INTO TUESDAY AFTERNOON...WITH RAINFALL AMOUNTS OF 2 TO 4 INCHESINTO TUESDAY AFTERNOON...WITH RAINFALL AMOUNTS OF 2 TO 4 INCHES LIKELY ACROSS NORTHERN OHIO. ISOLATED RAINFALL AMOUNTS OF UP TOLIKELY ACROSS NORTHERN OHIO. ISOLATED RAINFALL AMOUNTS OF UP TO 6 INCHES POSSIBLE.6 INCHES POSSIBLE.

* THE GROUND REMAINS SATURATED ACROSS THE AREA DUE TO THE RECENT* THE GROUND REMAINS SATURATED ACROSS THE AREA DUE TO THE RECENT SNOWMELT. RIVERS AND STREAMS ARE EXPECTED TO QUICKLY RESPOND TOSNOWMELT. RIVERS AND STREAMS ARE EXPECTED TO QUICKLY RESPOND TO ADDITIONAL RAINFALL...AND SIGNIFICANT WIDESPREAD FLOODING ISADDITIONAL RAINFALL...AND SIGNIFICANT WIDESPREAD FLOODING IS POSSIBLE.POSSIBLE.

RAPID flooding possible, typically

shorter duration than ‘FLOOD’ Watch


Factors that Affect Flood Factors that Affect Flood PotentialPotential

Topography (southern/eastern)Topography (southern/eastern)– Steep slopes prone to flash flooding Steep slopes prone to flash flooding

Characteristics of the soil- clay, sand. Characteristics of the soil- clay, sand.

Vegetation- summer vs winter Vegetation- summer vs winter

Existing Snow PackExisting Snow Pack

Frozen soil Frozen soil

Soil wetness- how much rain has fallen Soil wetness- how much rain has fallen recently?recently?


Flash FloodsFlash Floods

Shadyside, OH (June Shadyside, OH (June 1990)1990)• Remains one of deadliest Remains one of deadliest

recent flash floods in the recent flash floods in the U.S.U.S.

• 4 inches of rain in under 2 4 inches of rain in under 2 hours hours

• 26 Deaths (Belmont county)26 Deaths (Belmont county)

• 80 Residences Destroyed80 Residences Destroyed

• >250 Buildings Damaged>250 Buildings Damaged

Source: NOAA/NWS


““Typical” Thunderstorm Typical” Thunderstorm Pattern for Flash FloodingPattern for Flash Flooding

Stationary Front across Stationary Front across OhioOhio

– Heaviest rainfall along and Heaviest rainfall along and just to the northjust to the north

Slow moving area of Slow moving area of High Pressure over the High Pressure over the southeast USsoutheast US

– This setup usually causes a This setup usually causes a very humid, “tropical” very humid, “tropical” airmass over Ohioairmass over Ohio

– Moisture travels up the Moisture travels up the Mississippi valley into OhioMississippi valley into Ohio

August 21, 2007 – Findlay / Mansfield Flash Flood


Common Causes of Summer Common Causes of Summer Ohio Ohio Flash Floods Floods

Slow-moving Thunderstorms Slow-moving Thunderstorms

Often nocturnal Often nocturnal (Mesoscale Convective Systems)(Mesoscale Convective Systems)

Most common from late May-early JulyMost common from late May-early July

More common in Northern plains More common in Northern plains – Shadyside – June 1990Shadyside – June 1990– Central and Southeast Ohio – June 1998Central and Southeast Ohio – June 1998– Cincinnati area – July 2001Cincinnati area – July 2001– Warren – July 2003Warren – July 2003– Columbus – Gahanna/Bexley – August 2003Columbus – Gahanna/Bexley – August 2003– Lake enhancement – Lorain county Summer 2005Lake enhancement – Lorain county Summer 2005– NE Ohio – July 2006NE Ohio – July 2006


Cincinnati Tri State Flash FloodCincinnati Tri State Flash FloodRainfall was in about 6 Rainfall was in about 6 hours timehours time

3 Deaths3 Deaths~300 homes and businesses ~300 homes and businesses damageddamaged$30 Million in damages$30 Million in damages


Additional Flash Flood Additional Flash Flood HazardsHazards

Sudden flooding Sudden flooding situationssituations• Dam breaksDam breaks

• Ice JamsIce Jams

Debris flowsDebris flows• Water carries rocks, logs, Water carries rocks, logs,

glass, and various other glass, and various other objectsobjects

MudslidesMudslides

Remains of Landslide that coveredRemains of Landslide that coveredSR 83 in Holmes CountySR 83 in Holmes County


Debris FlowDebris Flow


So What’s Changed since So What’s Changed since Shadyside?Shadyside?

Improved radar precipitation estimatesImproved radar precipitation estimates

Ability to compare surrounding radarsAbility to compare surrounding radars

Ground truth reports (STORMs gages in Ohio)Ground truth reports (STORMs gages in Ohio)

Improved forecaster tools to better determine basin Improved forecaster tools to better determine basin boundaries and impact of heavy rain.boundaries and impact of heavy rain.


““Typical” Widespread Flood Typical” Widespread Flood Event PatternEvent Pattern

Stationary front across Stationary front across Ohio Valley, usually just Ohio Valley, usually just south of Ohiosouth of Ohio

Low pressure moves from Low pressure moves from lower Mississippi Valley lower Mississippi Valley along frontalong front

Heaviest rainfall typically Heaviest rainfall typically falls just northwest of the falls just northwest of the low tracklow track• Similar to heavy snow in Similar to heavy snow in

winter – but colder!winter – but colder!

January 5-6, 2005


Flood Warning for Small Flood Warning for Small StreamsStreams

BULLETIN - IMMEDIATE BROADCAST REQUESTEDBULLETIN - IMMEDIATE BROADCAST REQUESTEDFLOOD WARNINGFLOOD WARNINGNATIONAL WEATHER SERVICE WILMINGTON OHNATIONAL WEATHER SERVICE WILMINGTON OH425 AM EDT WED MAR 19 2008425 AM EDT WED MAR 19 2008

OHC027-047-071-191430-OHC027-047-071-191430-/X.NEW.KILN.FA.W.0024.080319T0825Z-080319T1430Z//X.NEW.KILN.FA.W.0024.080319T0825Z-080319T1430Z//00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO//00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/425 AM EDT WED MAR 19 2008425 AM EDT WED MAR 19 2008

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED ATHE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLOOD WARNING FOR...* FLOOD WARNING FOR... FAYETTE COUNTY IN CENTRAL OHIO...FAYETTE COUNTY IN CENTRAL OHIO... CLINTON COUNTY IN SOUTHWEST OHIO...CLINTON COUNTY IN SOUTHWEST OHIO... HIGHLAND COUNTY IN SOUTHWEST OHIO...HIGHLAND COUNTY IN SOUTHWEST OHIO...

* UNTIL 1030 AM EDT.* UNTIL 1030 AM EDT.

* AT 424 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR HAS * AT 424 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR HAS ESTIMATED THAT 2 TO 3 INCHES OF RAIN HAS FALLEN ACROSS THE AREA ESTIMATED THAT 2 TO 3 INCHES OF RAIN HAS FALLEN ACROSS THE AREA SINCE YESTERDAY. THIS RAINFALL HAS CAUSED MANY CREEKS AND STREAMS SINCE YESTERDAY. THIS RAINFALL HAS CAUSED MANY CREEKS AND STREAMS TO OVERFLOW THEIR BANKS. TO OVERFLOW THEIR BANKS.

* MODERATE TO LOCALLY HEAVY RAIN WILL CONTINUE ACROSS THE WARNED * MODERATE TO LOCALLY HEAVY RAIN WILL CONTINUE ACROSS THE WARNED AREA THROUGH THIS MORNING. AN ADDITIONAL 1 TO 1.5 INCHES OF RAIN AREA THROUGH THIS MORNING. AN ADDITIONAL 1 TO 1.5 INCHES OF RAIN IS EXPECTED TO FALL THROUGH THE MORNING HOURS.IS EXPECTED TO FALL THROUGH THE MORNING HOURS.

SOME LOCATIONS THAT MAY EXPERIENCE FLOODING INCLUDE...BLANCHESTER...SOME LOCATIONS THAT MAY EXPERIENCE FLOODING INCLUDE...BLANCHESTER...GREENFIELD...HILLSBORO...WASHINGTON COURT GREENFIELD...HILLSBORO...WASHINGTON COURT HOUSE...WILMINGTON...CLARKSVILLE...AND JEFFERSONVILLE.HOUSE...WILMINGTON...CLARKSVILLE...AND JEFFERSONVILLE.

HEAVY RAINS FLOOD ROADS AND LOW LYING AREAS RAPIDLY. DO NOT DRIVEHEAVY RAINS FLOOD ROADS AND LOW LYING AREAS RAPIDLY. DO NOT DRIVEYOUR VEHICLE INTO WATER OF AN UNKNOWN DEPTH ON THE THE ROAD. IT ONLYYOUR VEHICLE INTO WATER OF AN UNKNOWN DEPTH ON THE THE ROAD. IT ONLYTAKES TWO FEET OF RUSHING WATER TO CARRY AWAY MOST SPORT UTILITYTAKES TWO FEET OF RUSHING WATER TO CARRY AWAY MOST SPORT UTILITYVEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO REACH YOURVEHICLES AND PICKUPS. TAKE A DIFFERENT ROUTE TO REACH YOURDESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...MOST FLOODDESTINATION OR WAIT UNTIL THE WATER RECEDES. REMEMBER...MOST FLOODRELATED DEATHS OCCUR IN AUTOMOBILES.RELATED DEATHS OCCUR IN AUTOMOBILES.


January 2005 FloodingJanuary 2005 Flooding

Ingredients:Ingredients:• Historic Snowfall Dec 22 – Dec 23Historic Snowfall Dec 22 – Dec 23

• Rapid Snowmelt Dec 31 – Jan 1Rapid Snowmelt Dec 31 – Jan 1

• 5-8” of Rainfall across Central and 5-8” of Rainfall across Central and Northern Ohio Jan 3 – Jan 14Northern Ohio Jan 3 – Jan 14

Impacted every major river basin Impacted every major river basin within Ohiowithin Ohio

Presidential Disaster Declaration Presidential Disaster Declaration issued in 32 countiesissued in 32 counties

11 COE Reservoirs in Ohio 11 COE Reservoirs in Ohio reached record pool levelsreached record pool levels

Maumee River at Grand RapidsMaumee River at Grand Rapids©© 2005 Toledo Blade 2005 Toledo Blade

Pemberville, OhioPemberville, Ohio©© 2005 Toledo Blade 2005 Toledo Blade


Major River FloodingMajor River Flooding((evacuations/widespread property loss)evacuations/widespread property loss)

Larger rivers take more Larger rivers take more than 6 hours to react than 6 hours to react

Often preceded by Often preceded by widespread flash floodingwidespread flash flooding• While Snowmelt can often be While Snowmelt can often be

a factor, most of the MAJOR a factor, most of the MAJOR Ohio River Floods were a Ohio River Floods were a result of primarily heavy rainresult of primarily heavy rain

Saturated or Frozen soilsSaturated or Frozen soils

MajorMajor Summer River Summer River Floods are less commonFloods are less common• Exception – June 1998, July Exception – June 1998, July

20032003Heavy Rainfall January 2004Heavy Rainfall January 2004Great Miami at Miamitown – Hamilton Co.Great Miami at Miamitown – Hamilton Co.


Snow’s over – No worries, Snow’s over – No worries, right?right?

Available from National Hydrological Remote Sensing Centerhttp://www.nohrsc.nws.gov

Snow Water Equivalent 12/30/2004

Snow Water Equivalent 12/31/2004


Flood Warning for Specific Flood Warning for Specific River PointRiver Point

WGUS41 KILN 191920WGUS41 KILN 191920FLWILNFLWILNBULLETIN - IMMEDIATE BROADCAST REQUESTEDBULLETIN - IMMEDIATE BROADCAST REQUESTEDFLOOD WARNINGFLOOD WARNINGNATIONAL WEATHER SERVICE WILMINGTON OHNATIONAL WEATHER SERVICE WILMINGTON OH320 PM EDT WED MAR 19 2008320 PM EDT WED MAR 19 2008

...THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A FLOOD ...THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A FLOOD WARNING FOR THE FOLLOWING RIVERS...WARNING FOR THE FOLLOWING RIVERS...

OHIO BRUSH CREEK ABOVE WEST UNIONOHIO BRUSH CREEK ABOVE WEST UNION

DO NOT DRIVE YOUR CAR THROUGH FLOODED ROADWAYS. THE WATER DEPTH MAY DO NOT DRIVE YOUR CAR THROUGH FLOODED ROADWAYS. THE WATER DEPTH MAY BE DEEPER THAN IT APPEARS. BE DEEPER THAN IT APPEARS.

STAY TUNED TO DEVELOPMENTS BY LISTENING TO NOAA WEATHER ALL HAZARDS STAY TUNED TO DEVELOPMENTS BY LISTENING TO NOAA WEATHER ALL HAZARDS RADIO.RADIO.

OHC001-200720-OHC001-200720-/O.NEW.KILN.FL.W.0045.080319T2048Z-080320T1002Z//O.NEW.KILN.FL.W.0045.080319T2048Z-080320T1002Z//WUNO1.1.ER.080319T2048Z.080320T0100Z.080320T0402Z.NO//WUNO1.1.ER.080319T2048Z.080320T0100Z.080320T0402Z.NO/320 PM EDT WED MAR 19 2008320 PM EDT WED MAR 19 2008

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLOOD WARNING FOR * FLOOD WARNING FOR THE OHIO BRUSH CREEK ABOVE WEST UNIONTHE OHIO BRUSH CREEK ABOVE WEST UNION* UNTIL THURSDAY MORNING.* UNTIL THURSDAY MORNING.* AT 3 PM THE STAGE WAS 13.6 FEET. * AT 3 PM THE STAGE WAS 13.6 FEET. * MINOR FLOODING IS FORECAST. * MINOR FLOODING IS FORECAST. * FLOOD STAGE IS 15 FEET. * FLOOD STAGE IS 15 FEET. * THE RIVER WILL RISE ABOVE FLOOD STAGE BY LATE THIS AFTERNOON AND * THE RIVER WILL RISE ABOVE FLOOD STAGE BY LATE THIS AFTERNOON AND CONTINUE TO RISE TO NEAR 17.3 FEET BY TONIGHT. THE RIVER WILL FALL CONTINUE TO RISE TO NEAR 17.3 FEET BY TONIGHT. THE RIVER WILL FALL BELOW FLOOD STAGE BY AFTER MIDNIGHT TONIGHT.BELOW FLOOD STAGE BY AFTER MIDNIGHT TONIGHT.* AT STAGES NEAR 18 FEET, WATER CONTINUES TO SPILL ONTO ROUTE * AT STAGES NEAR 18 FEET, WATER CONTINUES TO SPILL ONTO ROUTE 348...WHILE PORTIONS OF PEEBLES AND LOW AREAS EAST OF WEST UNION 348...WHILE PORTIONS OF PEEBLES AND LOW AREAS EAST OF WEST UNION BECOME FLOODED.BECOME FLOODED.


River Flood Product…River Flood Product…UPGRADE to higher flood UPGRADE to higher flood category

FLOOD WARNINGFLOOD WARNINGNATIONAL WEATHER SERVICE CLEVELAND OHNATIONAL WEATHER SERVICE CLEVELAND OH656 AM EDT SAT MAR 17 2007656 AM EDT SAT MAR 17 2007

...FORECAST FLOODING CHANGED FROM MINOR TO MODERATE SEVERITY FOR THE FOLLOWING RIVERS IN OHIO...FORECAST FLOODING CHANGED FROM MINOR TO MODERATE SEVERITY FOR THE FOLLOWING RIVERS IN OHIO

SCIOTO RIVER NEAR PROSPECTSCIOTO RIVER NEAR PROSPECT

REMEMBER...NEVER DRIVE YOUR CAR THROUGH FLOODED ROADWAYS. THE WATERREMEMBER...NEVER DRIVE YOUR CAR THROUGH FLOODED ROADWAYS. THE WATERMAY BE DEEPER THAN IT APPEARS. TURN AROUND AND FIND ANOTHER ROUTE.MAY BE DEEPER THAN IT APPEARS. TURN AROUND AND FIND ANOTHER ROUTE.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS AND UPDATES.STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER DETAILS AND UPDATES.

OHC101-171856-OHC101-171856-/X.EXT.KCLE.FL.W.0059.000000T0000Z-070319T0436Z//X.EXT.KCLE.FL.W.0059.000000T0000Z-070319T0436Z//PRGO1.2.ER.070316T1556Z.070317T1800Z.070318T2236Z.NO//PRGO1.2.ER.070316T1556Z.070317T1800Z.070318T2236Z.NO/656 AM EDT SAT MAR 17 2007656 AM EDT SAT MAR 17 2007

...FORECAST FLOODING INCREASED FROM MINOR TO MODERATE SEVERITY......FORECAST FLOODING INCREASED FROM MINOR TO MODERATE SEVERITY...

...THE FLOOD WARNING CONTINUES FOR...THE FLOOD WARNING CONTINUES FOR

THE SCIOTO RIVER NEAR PROSPECTTHE SCIOTO RIVER NEAR PROSPECT* UNTIL LATE SUNDAY NIGHT.* UNTIL LATE SUNDAY NIGHT.* AT 6 AM SATURDAY THE STAGE WAS...10.8 FEET.* AT 6 AM SATURDAY THE STAGE WAS...10.8 FEET.* MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST* MINOR FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST* FLOOD STAGE IS 9.0 FEET.* FLOOD STAGE IS 9.0 FEET.* THE RIVER WILL CONTINUE TO RISE AND CREST NEAR 11.0 FEET BY THIS MORNING.* THE RIVER WILL CONTINUE TO RISE AND CREST NEAR 11.0 FEET BY THIS MORNING.* AT 11.5 FEET...FLOODING BEGINS ALONG THE MAIN STREET CURVE. MANY * AT 11.5 FEET...FLOODING BEGINS ALONG THE MAIN STREET CURVE. MANY STREETS FLOODED NORTH OF MARKET STREET. STREETS FLOODED NORTH OF MARKET STREET.


Actions to TakeActions to TakeReadyReady,, SetSet - - Go!Go!

Ready (Hazardous Weather Outlook)Ready (Hazardous Weather Outlook)• Check each day for potential weather Hazards Check each day for potential weather Hazards

• Keep an eye out for Updates, Watches and WarningsKeep an eye out for Updates, Watches and Warnings

• Severe Weather Awareness Week is a GREAT time to Severe Weather Awareness Week is a GREAT time to practice your Plan!practice your Plan!

• When only isolated thunderstorms possible, a Flood or When only isolated thunderstorms possible, a Flood or Flash Flood Warning may NOT be preceded by a Watch Flash Flood Warning may NOT be preceded by a Watch (e.g, August 2003, Central OH)(e.g, August 2003, Central OH)


Isolated Slow Moving Summer Isolated Slow Moving Summer StormsStorms

May be highlighted in HWOMay be highlighted in HWO

Columbus - August 12 and 15, 2003Columbus - August 12 and 15, 2003

August 2003 dominated by high pressureAugust 2003 dominated by high pressure

• Not much instability, nor much chance for widespread Not much instability, nor much chance for widespread thunderstormsthunderstorms

• Precipitable Water values were high (1.5” – 1.9”)Precipitable Water values were high (1.5” – 1.9”)

• Storm Motion ~ 5 to 6 kts (slow movers!)Storm Motion ~ 5 to 6 kts (slow movers!)

Potential for ISOLATED torrential rain was highPotential for ISOLATED torrential rain was high

• Thunderstorm Coverage was expected to be sparseThunderstorm Coverage was expected to be sparse

Warnings issued for Franklin county, OH – but NOT Warnings issued for Franklin county, OH – but NOT preceded by a Flood Watch!preceded by a Flood Watch!


HAZARDOUS WEATHER OUTLOOKHAZARDOUS WEATHER OUTLOOKNATIONAL WEATHER SERVICE WILMINGTON OHNATIONAL WEATHER SERVICE WILMINGTON OH550 AM EDT TUE AUG 12 2003550 AM EDT TUE AUG 12 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN INDIANA…THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN INDIANA…NORTHERN KENTUCKY AND THE SOUTHWEST QUARTER OF OHIO.NORTHERN KENTUCKY AND THE SOUTHWEST QUARTER OF OHIO.

.DAY ONE...TODAY.DAY ONE...TODAY

SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND EVENING ACROSS THE OUTLOOK AREA. THE THREAT AND COVERAGE OF EVENING ACROSS THE OUTLOOK AREA. THE THREAT AND COVERAGE OF THUNDERSTORMS WILL BE A LITTLE BETTER NORTH OF I-70. THUNDERSTORMS WILL BE A LITTLE BETTER NORTH OF I-70. SOME SOME STORMS WILL PRODUCE HEAVY RAINFALL AND LOCALIZED FLOODING. STORMS WILL PRODUCE HEAVY RAINFALL AND LOCALIZED FLOODING. AN ISOLATED SEVERE STORM WILL ALSO BE POSSIBLE THIS AN ISOLATED SEVERE STORM WILL ALSO BE POSSIBLE THIS AFTERNOON AND EVENING. AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

AN ISOLATED AFTERNOON OR EVENING THUNDERSTORM WILL BE AN ISOLATED AFTERNOON OR EVENING THUNDERSTORM WILL BE POSSIBLE WEDNESDAY. IF THE THUNDERSTORM DEVELOPS THEN POSSIBLE WEDNESDAY. IF THE THUNDERSTORM DEVELOPS THEN TORRENTIAL RAINFALL AND LOCALIZED FLOODING WILL BE TORRENTIAL RAINFALL AND LOCALIZED FLOODING WILL BE POSSIBLE. POSSIBLE.

.SPOTTER INFORMATION STATEMENT....SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.SPOTTER ACTIVATION IS NOT ANTICIPATED.


Review of FloodingReview of Flooding

Can occur anytime of yearCan occur anytime of year• Winter/Spring- snowmelt and heavy rainWinter/Spring- snowmelt and heavy rain

• Spring/Summer-slow moving thunderstormsSpring/Summer-slow moving thunderstorms

• Summer/Fall- Dying Tropical Storms, ThunderstormsSummer/Fall- Dying Tropical Storms, Thunderstorms

Fatalities are most often due to poor choicesFatalities are most often due to poor choices• Driving/walking through flooded areaDriving/walking through flooded area

• Children playing near drainage ditchChildren playing near drainage ditch

• Flooding is #1 Severe Weather Killer, but is commonly Flooding is #1 Severe Weather Killer, but is commonly underestimated!underestimated!

• More education of public is neededMore education of public is needed

National Flood Safety Awareness WeekNational Flood Safety Awareness Week


Turn Around Don't DrownTurn Around Don't Drown

National flood safety public National flood safety public education campaign education campaign

Large Majority of flood Large Majority of flood deaths are preventabledeaths are preventable

• Driving into floodDriving into flood

• Walking too close to flooded Walking too close to flooded creek/rivercreek/river


National Flood Safety Awareness Week National Flood Safety Awareness Week Every MarchEvery March

Contact your NWS Contact your NWS Office for Assistance Office for Assistance

with PSAs, with PSAs, Education, ArticlesEducation, Articles

hazardous weather flooding. ohio ema hazardous weather course most deadly severe weather... 146**...

Documents

northwest ohio

northeast ohio

ohio valley

ohio annual average

portions of north central

flash flood watch

severe weather

small streams