A isolated thunderstorm moved through Johnson City, Tennessee, producing flash flooding in the area.
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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 MRX wrote it up.
A isolated thunderstorm moved through Johnson City, Tennessee, producing flash flooding in the area.
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 Morristown, TN wrote its last area forecast discussion before the first event at Aug 19, 2:39 PM EST, 3 hours 21 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 339 PM EDT THU AUG 19 2010 .SHORT TERM...(TONIGHT THROUGH SATURDAY)...BUSY SHIFT THIS AFTERNOON AS SHOWERS/TSRA HAVE LINGERED OVER NE TN AND SW VA ...ALONG THE FRONTAL BOUNDARY. MAINLY HYDROLOGY CONCERNS WITH SOME FLOODING OCCURRING AGAIN IN SCOTT COUNTY VA...SEE LATEST LSRMRX PRODUCT FOR DETAILS. A COUPLE OF FLOOD ADVISORIES AND ONE FFW STILL IN EFFECT FOR SW VA AND NE TN. ORGANIZED CONVECTION WILL END BEFORE 6PM EDT...SO I OPTED FOR A PRE FIRST PERIOD IN ZONE FORECAST. CLINCH RIVER NEAR SPEERS FERRY IN SCOTT COUNTY VA IS ON THE RISE THIS AFTERNOON AND BEING CLOSELY MONITORED. PLEASE SEE OUR LATEST FLSMRX PRODUCT FOR THE LATEST CREST FORECAST (STILL BELOW FLOOD STAGE OF 18.0 FEET). OTHERWISE...TIME IS SHORT...SO WILL JUST SAY THAT REST OF FORECAST PERIODS FOR THE SHORT TERM WERE JUST SLIGHTLY TWEAKED...AND GENERALLY WERE ON TRACK. .LONG TERM...(SATURDAY NIGHT THROUGH THURSDAY)...NO MAJOR DIFFERENCES IN MODELS DURING THE PERIOD BUT STAYED A LITTLE CLOSER TO ECMWF DEPICTION. SOME UNCERTAINTY IN SYSTEM/FRONTAL TIMING FOR SATURDAY NIGHT BUT MODELS ARE INDICATING A WEAK SHORT WAVE FEATURE BUILDING ACROSS THE SOUTHERN APPALACHIANS AROUND SATURDAY/SATURDAY NIGHT TIMEFRAME SO MAINTAINED A 50 PERCENT POP FOR THE FORECAST AREA AT THIS TIME. MAIN UPPER TROF WILL BE PROGRESSING EAST ACROSS THE GREAT LAKES AND MIDWEST SUNDAY INTO MONDAY DRIVING A COOL FRONTAL BOUNDARY THROUGH THE REGION. KEPT PROBABILITY AT 40 PERCENT ON SUNDAY FOR CONVECTIVE PRECIP WHILE DROPPING BACK TO SLIGHT CHANCE SUNDAY NIGHT AS BOUNDARY SLIPS FURTHER SOUTH AND EAST. BOUNDARY STARTS TO SLOW DOWN AND MAY BECOME STATIONARY OVER NORTHERN GEORGIA ON MONDAY SO STAYED WITH A SLIGHT CHANCE FOR SHOWERS AND THUNDERSTORMS ACROSS SOUTHEAST TENNESSEE AND SOUTHWEST NORTH CAROLINA ON MONDAY WHILE OPTING FOR A NICE DRY FORECAST REMAINDER OF THE FORECAST AREA. WAS ABLE TO KEEP TUESDAY DRY WITH HIGHER PRESSURE BUILDING IN BEHIND THIS EARLY WEEK SYSTEM. UNCERTAINTY INCREASES LATE IN THE LONG TERM FORECAST BUT MODELS WOULD LIKE TO BRING YET ANOTHER UPPER TROF ACROSS THE NORTHERN TIER WITH ASSOCIATED COLD FRONT AT MID WEEK. USED THE SLIGHT CHANCE PROBABILITY FOR CONVECTION WITH THIS FRONT WHILE DRYING IT OUT AGAIN ON THURSDAY WITH EXPECTATION OF FRONTAL PASSAGE FOLLOWED BY LOWER DEWPOINT AND HIGHER PRESSURE. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 73 93 74 91 73 / 20 40 30 50 50 KNOXVILLE MCGHEE TYSON AIRPORT, TN 71 91 73 89 71 / 20 30 30 50 50 OAK RIDGE, TN 70 91 72 89 70 / 10 30 30 50 50 TRI CITIES AIRPORT, TN 65 90 66 87 66 / 20 10 10 50 50 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && TG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 450 AM EDT THU AUG 19 2010 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-200900- CHEROKEE-CLAY-SCOTT TN-CAMPBELL-CLAIBORNE-HANCOCK-HAWKINS- SULLIVAN-JOHNSON-MORGAN-ANDERSON-UNION-GRAINGER-HAMBLEN- NORTHWEST COCKE-COCKE SMOKY MOUNTAINS-NORTHWEST GREENE- SOUTHEAST GREENE-WASHINGTON TN-UNICOI-NORTHWEST CARTER- SOUTHEAST CARTER-ROANE-LOUDON-KNOX-JEFFERSON-NW BLOUNT- BLOUNT SMOKY MOUNTAINS-NORTH SEVIER-SEVIER SMOKY MOUNTAINS- SEQUATCHIE-BLEDSOE-RHEA-MEIGS-MCMINN-NORTHWEST MONROE- SOUTHEAST MONROE-MARION-HAMILTON-BRADLEY-WEST POLK-EAST POLK-LEE- WISE-SCOTT-RUSSELL-WASHINGTON- 450 AM EDT THU AUG 19 2010 /350 AM CDT THU AUG 19 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE NORTHEAST ACROSS THE AREA THIS MORNING. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE...WITH SOME FLOODING IN A FEW AREAS. SINCE THERE HAS BEEN REPEATED AREAS OF HEAVY RAINFALL THAT HAS OCCURRED IN THE PAST 24 HOURS...A FLASH FLOOD WATCH IS IN EFFECT FOR ALL OF SOUTHWEST VIRGINIA...SOUTHWEST NORTH CAROLINA AND TENNESSEE COUNTIES UNTIL 11 AM THIS MORNING. RAINFALL AMOUNTS WILL RANGE FROM ONE TO TWO INCHES ACROSS THE AREA...WITH SOME ISOLATED AND LOCALIZED AMOUNTS OF THREE TO FOUR INCHES. FLOODING IS POSSIBLE IN SOME AREAS IN EAST TENNESSEE...SOUTHWEST VIRGINIA AND SOUTHWEST NORTH CAROLINA. IF YOU APPROACH A FLOODED ROAD...TURN AROUND...DON'T DROWN. DO NOT DRIVE THROUGH FLOODED ROADS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A MOIST AIR MASS WILL RETURN TO THE SOUTHERN APPALACHIAN REGION SATURDAY...WITH SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS PRODUCING A THREAT FOR LOCALLY HEAVY RAIN. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING DUE TO THE POTENTIAL FOR FLASH FLOODING. TD
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
327 PM EDT THU AUG 19 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0315 PM FLASH FLOOD FORT BLACKMORE 36.77N 82.59W
08/19/2010 SCOTT VA LAW ENFORCEMENT
NUMEROUS ROADS CLOSED COUNTY WIDE...MULTIPLE MUD
SLIDES...6 FAMALIES EVACUATED IN FORT BLACKMORE AREA NEAR
BIG STONY CREEK...REPORTED BY DISPATCH.
&&
SROBERTSThe Knoxville radar (KMRX), 94 km away, was scanning. The volume nearest the first event began at 23:01 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall resulted in flash flooding with several inches of water over the road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2010Every state in 2010This day in weather historyWarnings in Tennessee, August 2010
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: 262499.