High freezing levels combined with moderate rain in the Susitna Valley resulted in the Yentna River rising above flood stage August 5th. 5 inches prior to the rising water.
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 AFC wrote it up.
High freezing levels combined with moderate rain in the Susitna Valley resulted in the Yentna River rising above flood stage August 5th. Rainfall in the Susitna Valley were 1 to 1.5 inches prior to the rising water.
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 Anchorage, AK wrote its last area forecast discussion before the first event at Aug 5, 1:00 PM AKST, 2 hours earlier.
AREA FORECAST DISCUSSION SOUTHCENTRAL AND SOUTHWEST ALASKA 200 PM AKDT THU AUG 5 2010 .MODEL DISCUSSION...MODEL INITIALIZATIONS AND FORECAST TRENDS IN MSLP/500MB FIELDS ARE REASONABLE AND SIMILAR. THE AERIAL EXTENT OF THE NAM QPF WITH FRONT IMPACTING SW ALASKA THIS MORNING APPEARS TO UNDERDONE. THE EC/GFS HANDLE THIS BETTER THROUGH THE EASTWARD PROGRESSION OF THE FRONT. .UPPER LEVELS... 500MB...LOW OVER THE WESTERN COPPER RIVER BASIN THIS AFTERNOON MOVES OVER THE YUKON FRIDAY EVENING. LOW AMPLITUDE RIDGE EXTENDING FROM THE WESTERN GULF TO OVER THE SUSITNA VALLEY IS DAMPENED AS IT MOVES EAST. SHORT WAVE OVER THE SW COAST THIS MORNING MOVES INTO THE WESTERN GULF/W COOK INLET LATE TONIGHT AND TO THE EASTERN GULF/EAST COPPER RIVER BASIN FRI EVENING. DEVELOPING WAVE MOVING ACROSS KAMCHATKA PEN DEVELOPS INTO A CLOSED CENTER AS IT MOVES INTO THE CENTRAL BERING SEA SAT NIGHT. THIS CENTER CONTINUES TO DEVELOP IT MOVES TO THE EASTERN BERING SEA SUN AND SETS UP MOIST SOUTHWESTERLY FLOW OVER SW ALASKA. .SHORT TERM FORECAST... .SOUTHCENTRAL...COLD UPPER LOW IS KICKING OFF A FEW THUNDERSTORMS OVER THE COPPER RIVER BASIN THIS AFTERNOON. CONDITIONS SHOULD STABILIZE OVERNIGHT WITH AREAS OF LOW CLOUDS AND FOG DEVELOP AS UPPER LOW KICKS NORTH AND RIDGE BUILDS IN. NEXT SHORT WAVE TO IMPACT THE WESTERN GULF AND WESTERN SOUTHCENTRAL APPEARS TO BE A LITTLE AHEAD OF SCHEDULE AND WILL PROBABLY BRING RAIN TO THESE AREAS LATE TONIGHT/EARLY FRI. MAIN AREA OF RAIN WILL BE ASSOCIATED WITH THIS WAVE AS IT MOVES ACROSS SOUTHCENTRAL FRI. CONDITIONS IMPROVING SOME SAT WITH SURFACE RIDGING AND WEAK WESTERLY FLOW ALOFT. NEXT BATCH OF RAIN MOVES IN SUN AS A WEATHER FRONT MOVES IN FROM THE WEST AND WINDS ALOFT SHIFT SOUTHWESTERLY. ALSO WILL SEE GUSTY GAP WINDS ACROSS SOUTHCENTRAL/COPPER RIVER BASIN SUN. .SOUTHWEST ALASKA...FRONTAL TROUGH OVER THE SOUTHWEST COAST THIS AFTERNOON IS SPREADING RAIN ACROSS THE AREA. FRONT MOVES THROUGH OVERNIGHT...GENERALLY CLOUDY CONDITIONS WITH SOME LIGHT RAIN/SHOWERS WILL CONTINUE ON THE BACKSIDE WITH MINOR SHORT WAVES ALOFT. ALSO GENERALLY WESTERLY FLOW ACROSS THE BERING SEA WILL CONTINUE STATUS AND AREAS OF FOG ACROSS COASTAL LOCATIONS. NEXT SURGE OF SIGNIFICANT MOISTURE AND STRONG WINDS WILL OCCUR AHEAD OF A DEVELOPING LOW AND WEATHER FRONT AS THEY MOVES TO THE EASTERN BERING SAT NIGHT/SUN. DEEP SOUTHWESTERLY FLOW ALOFT WILL LIKELY BRING AREAS OF MODERATE RAIN TO SW ALASKA. .ALEUTIANS/BERING SEA...AREAS OF LOW CLOUDS AND FOG CONTINUE THROUGH TONIGHT AND FRI. DEVELOPING LOW APPROACHING THE WESTERN ALEUTIANS INTENSIFIES AS IT MOVES TO 230 NM WEST OF SAINT PAUL ISLAND AT 979 MB LATE SAT NIGHT. ASSOCIATED FRONT MOVES EAST OF SAINT PAUL AND STRETCHES TO THE EASTERN ALEUTIANS EARLY SUN MORNING. EXPECT GALES TO IMPACT THE WEST ALEUTIANS LATE FRI NIGHT AND SPREAD TO THE EASTERN BERING SEA SAT NIGHT. .AER/ALU...WATCH/WARNING SUMMARY PUBLIC...FLOOD WARNING ZONE 145. MARINE...GALE 176N. FIRE WEATHER...NONE. RMC AUG 10
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alaska in 2010Every state in 2010This day in weather historyWarnings in Alaska, 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: 242385.