70s again; rain returns for Saturday

Our Sept-ober weather continues!

We saw official Twin Cities high temps of 73 degrees on Tuesday and Wednesday at Minneapolis-St. Paul International Airport.

Our average high temperature is only 57 degrees this time of year in the Twin Cities metro area.

73 would be a typical Twin Cities high temp in the second week of September.

Temperature trends

Thursday afternoon highs are expected to reach the 70s in much of southern and central Minnesota, with some 60s in the far north.

Most of Minnesota will see highs in the 70s on Friday, with a few spots in southern Minnesota and the Twin Cities metro area touching 80:

60s will be common on Saturday:

Sunday will bring highs in the 50s to the north, with 60s central and south:

Twin Cities metro area highs should stay in the lower 60s on Monday, followed by 50s next Tuesday and Wednesday.

Red flag warning

Forecasts of low relative humidity levels and gusty winds have prompted the National Weather Service to issue a red flag warning from noon to 7 p.m. this Thursday for parts of western, central and south-central Minnesota:

NWS Twin Cities

Any fires that start in the warning area could spread rapidly, so outdoor burning is not recommended.

Details of the warning:

URGENT – FIRE WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
538 AM CDT Thu Oct 19 2017

…RED FLAG WARNING THIS AFTERNOON FOR WESTERN MINNESOTA…

.A Red Flag Warning has been issued from noon to 7 PM CDT today
for western Minnesota. South winds of 15 to 20 mph with gusts to
around 30 mph are expected as humidity levels drop to less than 25
mph this afternoon. If gusty winds materialize further east where
RH values may fall into the teens, the warning may need to be
expanded.

MNZ041>043-047>049-054>058-064>067-073>075-082-083-091-092-191845-
/O.NEW.KMPX.FW.W.0002.171019T1700Z-171020T0000Z/
Douglas-Todd-Morrison-Stevens-Pope-Stearns-Lac Qui Parle-Swift-
Chippewa-Kandiyohi-Meeker-Yellow Medicine-Renville-McLeod-Sibley-
Redwood-Brown-Nicollet-Watonwan-Blue Earth-Martin-Faribault-
538 AM CDT Thu Oct 19 2017

…RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM CDT THIS
EVENING FOR LOW HUMIDITY AND STRONG WINDS FOR FIRE WEATHER ZONES
041, 042, 043, 047, 048, 049, 054, 055, 056, 057, 058, 064, 065,
066, 067, 073, 074, 075, 082, 083, 091, AND 092…

The National Weather Service in Twin Cities/Chanhassen has issued
a Red Flag Warning, which is in effect from noon today to 7 PM
CDT this evening.

* AFFECTED AREA…Fire weather zones 041, 042, 043, 047, 048,
049, 054, 055, 056, 057, 058, 064, 065, 066, 067, 073, 074,
075, 082, 083, 091, and 092.

* WIND…south 15 to 20 mph with gusts around 30 mph.

* HUMIDITY…less than 25 percent and perhaps as low as 20
percent.

* IMPACTS…any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A Red Flag Warning means that critical fire weather conditions
are either occurring now….or will shortly. A combination of
strong winds…low relative humidity…and warm temperatures can
contribute to extreme fire behavior.

Rain chances

Most of Minnesota will see some periods of rain Saturday and Saturday evening.

A thunderstorm is also possible.

The National Oceanic and Atmospheric Administration’s North American Mesoscale forecast model shows the potential rain pattern Saturday and Saturday evening:

NOAA NAM simulated radar Saturday and Saturday evening, via tropicaltidbits

The color chart to the right of the loop refers to the strength of the signal that returns to the radar, not to the amount of rain.

Winter outlook from NWS

The Climate Prediction Center of the National Weather Service has released its outlook for December through February.

That period is what we call “meteorological winter”, and it covers the coldest three month period of the year in the northern hemisphere.

CPC’s December through February temperature outlook shows a slight tendency for cooler than normal temps in northwestern and west-central Minnesota:

NOAA/NWS Climate Prediction Center

Equal chances of cooler or warmer than normal temps are shown for the remainder of Minnesota and also for Wisconsin.

The CPC precipitation outlook shows a slight tendency toward a wetter (snowier if it is cold enough) meteorological winter in much of Minnesota:

NOAA/NWS Climate Prediction Center

Seasonal outlooks are interesting, but tricky.

We saw a wetter than normal winter last year in the Twin Cities, but snowfall was much lower than normal.

Some of that precipitation fell as rain last winter, including almost one inch of rain in the Twin Cities on Christmas Day!

Programming note

You can hear my live weather updates on Minnesota Public Radio at 7:49 a.m. Thursdays and Fridays, and at 7:35 a.m., 9:35 a.m. and 4:35 p.m. each Saturday and Sunday.