"Climate Summary for August 2016"
No question, July and August were very wet months across the Midwest. Some spots across the state saw nearly a foot of water just during the month of August! Thanks to Mark Seeley from the MN Climate Office for this August Climate Summary below.
"Average temperatures for August from observers around the state were generally warmer than normal by 1 to 2 degrees F. The hottest periods during the month were over the first ten days, when daily Heat Index values soared above 100°F in several locations. Marshall (Lyon County) reported the highest temperature for the state on the 10th with a reading of 96°F. The lowest temperature for the month was just 37°F at International Falls on the 21st. For the first 8 months of 2016 temperatures have consistently been warmer than normal in Minnesota, placing this period as the 6th warmest in state history. The monthly total rainfall was above normal for most places in the state, except for a few isolated pockets of dryness. Many climate observers reported total monthly rainfall that was 2-3 times normal, and on a statewide basis it was the 3rd wettest August in history and wettest since 1980. For many communities it was a near-record or record wet August. Some examples include:"
11.85 inches at Red Wing
11.82 inches at Theilman (2nd wettest)
11.70 inches at Waseca (2nd wettest)
11.37 inches at Redwood Falls
9.70 inches at Chanhassen
8.96 inches at Twin Valley
8.74 inches at downtown St Paul
9.90 inches at University of Minnesota St Paul Campus
7.86 inches at Kabetogama
9.66 inches at Faribault (4th wettest)
10.21 inches at Milan (2nd wettest)
10.23 inches at Wabasha (2nd wettest)
8.36 inches at St Cloud (2nd wettest)
7.82 inches at MSP (6th wettest)
"Severe weather plagued the state during the month on several occasions: Over Augusst 10-11 severe thunderstorms moved across the west-central part of the state, bringing 4-7 inch rains to the Willmar-Olivia area, and later in the day to Wabasha County. Then over August 23-24 heavy rains fell across portions of southeastern Minnesota delivering 2-3 inch amounts, and nearly 8.5 inches south of the border in Decorah, Iowa. Then over August 27-28 heavy rains, strong winds, and some tornadoes were reported in Polk and Norman Counties of northwestern Minnesota. Some farm buildings were damaged in Norman County. With the added rainfall from August, following a wet July, this summer season (June-August) now ranks as the 4th wettest in state history, as the average 3-month rainfall for the state was just shy of 16 inches. For the Twin Cities this has been the 8th wettest summer in history with a total rainfall of 17.40 inches."
Rainfall Past 30 Days
Here's the radar estimated rainfall over the past 30 days, which suggests some fairly significant tallies across the southern half of the state and into western Wisconsin. Some spots saw nearly 12" of rain!
Rainfall Past 60 Days
The radar estimated rainfall over the past 60 days suggests several locations across the central and southern part of the state with some 12" to near 18" amounts.
Saturday started off a little cloudier than expected with numerous mid/upper level clouds drifting northeast through the region. Despite seeing a little more cloud cover than initially expected, temperatures and humidity values remained quite very enjoyable. Cloud cover also thinned a bit, which made for a very enjoyable sunset!
"Further Analysis from RMS on Hurricane Hermine"
"Hurricane Hermine made landfall over northwest Florida at approximately 06:00 UTC (02:00 local time) today, Friday September 2 as a Category 1 storm on the Saffir Simpson Hurricane Wind Scale, with maximum sustained wind speeds of 80 mph (130 km/hr). (1) RMS research has revealed measurable differences in vulnerability between northern Florida, where Hermine made landfall, and the rest of the state, with structures in northern Florida more vulnerable to wind. This is because there are significant differences in North Florida building stock, which is generally wooden-framed, compared with domestic properties in Central and South Florida where the use of masonry is more common. The buildings are also designed to sustain different wind speeds. Another possible reason for the higher vulnerability in northern Florida is that the area is more heavily wooded than highly developed Central Florida. Tree falls, especially from squalls in outer rainbands, can contribute to losses in areas that may not have received the highest winds from the core of the storm. For Hermine, this would be evident in the areas from Tampa northward to Perry. An analysis of wind-related claims from northern Florida related to Hurricane Ivan (2004) showed a higher severity of damage than wind-related claims from historical events which impacted central Florida."
HERMINE at Landfall Late Thursday Night
Here's a look at Hurricane Hermine just before landfall along the Florida coastline PM Thursday. Outer bands began whipping the state early Thursday, some of which produced severe weather with tornadoes and locally heavy rain. Interestingly, HERMINE was the first hurricane to affect the state since Hurricane Wilma in 2005, 11 years ago.
Tropical Watches and Warnings have now been extended to parts of the Northeast, including New York City, in advance of Hermine as if lifts northeast along the coast.
...TROPICAL STORM WATCH REMAINS IN EFFECT...
* LOCATIONS AFFECTED - BATTERY PARK - HARLEM - CENTRAL PARK
* WIND - LATEST LOCAL FORECAST: BELOW TROPICAL STORM FORCE WIND - PEAK WIND FORECAST: 20-30 MPH WITH GUSTS TO 50 MPH
* STORM SURGE - LATEST LOCAL FORECAST: LIFE-THREATENING STORM SURGE POSSIBLE - PEAK STORM SURGE INUNDATION: THE POTENTIAL FOR 2-4 FEET ABOVE GROUND SOMEWHERE WITHIN SURGE PRONE AREAS - WINDOW OF CONCERN: BEGINS EARLY SUNDAY AFTERNOON
* FLOODING RAIN - LATEST LOCAL FORECAST: - PEAK RAINFALL AMOUNTS: AROUND 1 INCH
Keeping and Eye on the Atlantic
While it may not look like much yet, NOAA's NHC is keeping an eye on this particular wave of energy as it has a low chance of becoming a tropical cyclone over the next 5 days... Stay tuned!
Atlantic 5 Day Outlook
The National Hurricane Center will continue to watch the wave of energy in the Central Atlantic over the next few days. At this point, the forecast calls for less than a 40% chance of tropical formation within the next 5 days.
Dwindling Daylight and a Wet Week Ahead
I've been so used to an early sunrise over the past few months that it came as a shock to me when it was still dark in the 5 o'clock hour this weekend. Note that we've lost nearly 2.5 hours of daylight since the Summer Solstice on June 20th and it sure is noticeable!
Daylight dwindles at its most rapid pace around the Autumnal Equinox. Unfortunately, we are losing nearly 3 minutes of daylight per day and are on pace to lose an additional hour of daylight by the first official day of Fall on September 22nd. Also note that the time change occurs only 2 months from now!
Weather conditions close to home will begin souring slowly as Hermine creates a meteorological traffic jam on the East Coast. The forecast calls for Hermine to stall offshore and strengthen into a hurricane once again, making for an ugly week from Boston to New Jersey. Meanwhile, several shots of t-storms roll through the Midwest with some forecasts calling for an additional 1 to 3 inches of rain possible through Friday.
Get ready for more skeeter swatting!
Extended Weather Outlook
SUNDAY: Breezy with spotty storms late. Winds: SE 10-20. High: 80.
SUNDAY NIGHT: Mostly cloudy with scattered storms. Winds: SSE 10-15. Low: 66.
LABOR DAY: Warmer and muggier. AM puddles with storms developing late, some could be strong. Winds: S 7-12. High: 84
TUESDAY: Mostly cloudy. Scattered storms with locally heavy rainfall. Winds: WNW 7-12. Wake-up: 70. High: 80
WEDNESDAY: Unsettled. More pop-up t-showers. Winds: SE 5-10. Wake-up: 67. High: 79
THURSDAY: Lingering AM showers, more PM sun. Winds: NW 5-10. Wake-up: 65. High: 76.
FRIDAY: Sunny start, storms develop late. Winds: SSE 5. Wake-up: 60. High: 78.
SATURDAY: Slow clearing trend, cooler breeze. Winds: NW 5-10. Wake-up: 61. High: 73.
This Day in Weather History
1992: Early morning storms result in 3/4 to 1 3/4 inch hail in Hennepin, Dakota, Rice and Goodhue Counties.
1941: A batch of tornadoes hits Minneapolis, New Brighton, and White Bear Lake, killing six people.
1925: The third consecutive day of 95 degrees or above occurs in the Minneapolis area.
Average High/Low for Minneapolis
Average High: 76F (Record: 98F set in 1925)
Average Low: 58F (Record: 39F set in 1974)
Sunrise/Sunset Times for Minneapolis
*Daylight Lost Since Yesterday: ~3mins & 2sec
*Daylight Lost Since Summer Solstice: ~2hours and 30mins
Moon Phase for September 4th at Midnight
4.2 Days Before First Quarter
Weather Outlook Sunday
Temperatures and dewpoints will be a little higher on Sunday than they have been over the past few days. It won't be overly hot and humid, but you will certainly notice the increase in humidity through early next week.
Weather Outlook Sunday
Sunday will be another fairly breezy day with sustained winds in the 10 to 20mph range with a few higher gusts possible across the southwestern part of the state.
Weather Outlook Sunday
After several days of dry and mostly sunny skies, Sunday's weather looks to sour a little with a few spotty showers and storms possible across the western and northern part of the state. The best chance of showers and storms looks to arrive overnight Sunday into early Monday morning.
The simulated radar from AM Sunday to PM Tuesday suggests that weather conditions will sour a bit as we head into the second half of the weekend/early next week. A few spotty showers and storms may be possible on Sunday, but the best chance arrives late Sunday into early Monday and again late Monday into early Tuesday. Some of the storms could be strong to severe with locally heavy rainfall.
Here's the rainfall potential through PM Tuesday, which suggests a fairly decent surge of moisture starting to move into the the state by late weekend/early next week Note that rainfall tallies look impressive with widespread 1" to 2"+ amounts possible.
Thunder Threat Sunday
Sunday sees a little better chance of storms late in the day across the eastern part of North and South Dakota, some of which could be a little on the strong to possibly severe side. Whatever develops there could slide into far western Minnesota late Sunday evening/early Monday morning.
Severe Threat Monday
As the unsettle weather nears, strong to severe storms may develop late Monday...
...EASTERN NEB/SD INTO MN AND NORTHWEST WI... SOME EARLY DAY SHOWERS AND THUNDERSTORMS MAY BE ONGOING ACROSS PARTS OF MN/WI AND ASSOCIATED CLOUD COVER COULD INITIALLY INHIBIT HEATING. FURTHERMORE...WEAK HEIGHT RISES AND WARMING IN THE 850-700 MB LAYER WILL INHIBIT CONVECTIVE DEVELOPMENT DURING MOST OF THE DAY. HOWEVER...SOUTHERLY LOW LEVEL FLOW WILL TRANSPORT RICH BOUNDARY LAYER MOISTURE NORTHWARD WITH MID/UPPER 60S DEWPOINTS FORECAST ACROSS PORTIONS OF THE MID-MO/UPPER MS VALLEYS. MOST GUIDANCE SUGGEST INHIBITION WILL DECREASE BY 00Z AS STRONGER FORCING FOR ASCENT BEGINS TO MOVE OVER THE REGION AND WEAK HEIGHT FALLS ENSUE. WHILE THIS WILL BE SLIGHTLY OUT OF PHASE WITH PEAK HEATING...AT LEAST A SHORT WINDOW OF SURFACE-BASED CONVECTION IS EXPECTED AFTER 00Z...MAINLY NEAR THE SURFACE BOUNDARY FROM FAR NORTHEAST NEB INTO FAR EASTERN SD AND THROUGH CENTRAL MN INTO NORTHWEST WI. STEEPENING MIDLEVEL LAPSE RATES AND BULK EFFECTIVE SHEAR GREATER THAN 40 KT WILL SUPPORT SOME SUPERCELLS CAPABLE OF LARGE HAIL AND DAMAGING WINDS. A TORNADO THREAT MAY EXIST...THOUGH THIS IS A BIT MORE UNCERTAIN AT THIS TIME GIVEN THE TIMING OF CONVECTION. AN INCREASING SOUTH/SOUTHWESTERLY LLJ OVERNIGHT WILL AID IN UPSCALE GROWTH A FEW LINES/BOWING SEGMENTS MAY TRACK NORTHEAST ACROSS THE SLIGHT RISK AREA.
Severe Threat Tuesday
The severe threat on Sunday appears to shift a little farther south on Tuesday. Here's the latest from NOAA's SPC:
...EASTERN NEB TO WI... GUIDANCE VARIES REGARDING THE AMOUNT AND LOCATION OF ANY ONGOING CONVECTION TUESDAY MORNING...AND THIS COULD IMPACT RISK AREAS AS THESE DETAILS BECOME MORE CERTAIN. HOWEVER...GUIDANCE HAS BEEN REASONABLY CONSISTENT IN DEPICTING FAVORABLE CONDITIONS FOR CONTINUED SEVERE THREAT ALONG THE AFOREMENTIONED SURFACE BOUNDARY TUESDAY AFTERNOON/EVENING FROM THE MID-MO TO UPPER-MS VALLEY. SURFACE DEWPOINTS IN THE MID TO UPPER 60S WILL BE MAINTAINED ON SOUTHERLY LOW LEVEL FLOW AND A MODERATELY UNSTABLE AND UNCAPPED ENVIRONMENT IS DEPICTED IN FORECAST SOUNDINGS ACROSS THE REGION BY LATE AFTERNOON. STRONGEST DEEP LAYER SHEAR MAY REMAIN A BIT NORTH OF BEST THERMODYNAMIC ENVIRONMENT...BUT WILL BE SUFFICIENT TO SUPPORT INITIAL SUPERCELL STORM MODES...WITH ALL SEVERE HAZARDS POSSIBLE. UPSCALE GROWTH IS POSSIBLE INTO THE EVENING/OVERNIGHT ONCE AGAIN WHEN STRONGER UPPER FORCING/HEIGHT FALLS ENSUE IN CONJUNCTION WITH BOUNDARY PARALLEL FLOW.
7 Day Rainfall Outlook
The sunny, dry, comfortable weather as of late certainly has been a treat. Enjoy it while you can because unsettled and wetter weather returns late weekend into next week. According to NOAA's WPC, the 7 day rainfall forecast suggests fairly widespread 1" to 3"+ rainfall through the end of next week.
Extended Weather Outlook
The extended temperature outlook through the first full week of September suggests a bit of a warm up by the end of the weekend and Monday with muggier dewpoints as well. However, it appears that it won't last too long as readings settle back to near normal levels by the middle and end of the week.
6 to 10 Day Temp Outlook
According to NOAA's CPC, the 6 to 10 day temperature outlook suggests a fairly decent chance of warmer than normal conditions settling in around the Great Lakes Region during the first full week of September. A bigger blob of cooler air will settle in across the Northwestern part of the country, which may drift our way as we approach the 2nd weekend of the month.
6 to 10 Day Temp Outlook
The national outlook suggests that much of the eastern part of the country will remain above average, however, there will be a fairly significant pocket of below average temps across the central and northern Rockies.
High Elevation Snow?
Take a look at this! The National Weather Service has issued a Winter Weather Advisory for parts of western Montana above 7000ft. for snowfall accumulations that could approach 2" to 5" from Sunday into Monday.
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM NOON SUNDAY TO NOON MDT MONDAY ABOVE 6000 FEET...
* IMPACTS/TIMING: AN EARLY SEASON STORM WILL DEVELOP SUNDAY MORNING IN SOUTHWESTERN MONTANA AND TRACK NORTH TOWARD CANADA MONDAY AFTERNOON. UNUSUALLY COLD TEMPERATURES WILL PRODUCE SNOW ABOVE 6000 FEET. AREAS OF CONCERN ARE MAINLY BACKCOUNTRY ROADS AND RECREATIONAL AREAS ABOVE 6000 FEET...SUCH AS GEORGETOWN LAKE AND SKALKAHO PASS. CAMPERS...HIKERS...AND HUNTERS SHOULD PLAN FOR RAW AND WINTRY BACKCOUNTRY CONDITIONS IN THESE AREAS STARTING SUNDAY AFTERNOON AND OVERNIGHT INTO MONDAY MORNING. LOST TRAIL PASS COULD SEE LIGHT SNOW ACCUMULATIONS FOR BRIEF PERIODS OF TIME WITH THE HEAVIER PRECIPITATION...THOUGH EXPECTED TO MELT FAIRLY QUICKLY.
* SNOW ACCUMULATIONS: 1 TO 2 INCHES AROUND 6000 FEET WITH 2 TO 5 INCHES ABOVE 7000 FEET.
National Weather Outlook
The national weather outlook shows Hermine off the East Coast, which in turn will have impacts across the rest of the nation. Tropical systems tend to have ripple effects on other weather systems, so things don't move along as quickly as they otherwise would. High pressure will linger a little longer across the Eastern Great Lakes and unsettled, wetter weather will linger across the Plains over the next few days as Hermine creates a traffic jam in the East.
According to NOAA's WPC, the 5 day forecast suggests heavier rain associated with Hermine will stay mainly offshore. Meanwhile, several rounds of showers and storms will keep the threat of locally heavy rainfall in place over the Midwest through much of the week.
Lester in the Pacific
Here's a view of a much weaker Lester in the Central Pacific Ocean as it neared the Hawaiian Islands on Saturday. As of AM Sunday, Lester was a Tropical Storm and was well north of the Islands and was headed quickly north.
After making a close encounter with the Hawaiian Islands, Lester will continue to drift north away from the Islands through the early week time frame.
Thanks for checking in and have a great end of your week and weekend ahead!
Don't forget to follow me on Twitter @TNelsonWX