Area Forecast Discussion
Issued by NWS Duluth, MN
FXUS63 KDLH 171015
Area Forecast Discussion
National Weather Service Duluth MN
415 AM CST Fri Feb 17 2017
.SHORT TERM...(Today through Saturday)
Issued at 410 AM CST Fri Feb 17 2017
A surface low over Saskatchewan this morning has extended a warm
front southeast across eastern North Dakota to southwestern
Minnesota as of early this morning. A cold front extends to the
southwest to western Montana. The surface low is expected to
gradually move east today and tonight, moving across northern
Manitoba before getting to Ontario Saturday. This low will stay
well north of the forecast area, and we will only be on the
southern fringes of the better dynamics. The warm front will
slowly ease across us today, before being followed by a cold front
tonight. This will produce a very warm day across the forecast
area today, with high temperatures rising into the 40s and even
low 50 for many locations. Have gone on the warm end of guidance
for today, but even so it is possible that our dark trees and the
south winds with dry warm air advection going on aloft that we
could get even warmer. We are going to be melting snow like mad
today, which is going to produce more low level moisture, which
may hold temperatures back. Have gone on the warm end of guidance
in our south, with near to just above where the snow is deeper
farther north. We are a few degrees shy in the current forecast,
but have included record highs and warm lows for the next couple
days for reference. See climate section below. The melting snow
and light winds expected tonight is going to make us very
vulnerable to fog tonight. Most of the models are depicting a
shallow inversion near the surface overnight tonight which does
indicate stratus formation, but they tend to over do it, and would
prefer to wait until conditions are more favorable, as the cold
front moving through should help keep it away. Have included fog
in the forecast for now, but we may need to add some stratus in
later. Saturday the cold front moves quickly off to the east, with
ridging building into the area from the west. This may aid
tonight`s fog into becoming stratus or having very slow clearing,
and we have some bust potential for high temperatures. Where we
break out into some sunshine we could be back into the 40s again,
but if not we`ll be in the 30s to low 40s. For now have gone
closer to the consensus, and we will have to monitor trends in low
clouds before breaking either way.
.LONG TERM...(Saturday night through Thursday)
Issued at 410 AM CST Fri Feb 17 2017
Upper level ridging will again take hold across the region by
Saturday night, as the upper level shortwave departs to the east. A
major longwave trough moving into the Desert Southwest and into the
Baja region will eventually attempt to phase with northern stream
energy by Monday, allowing a feed of moisture from the Gulf of
Mexico. Rain should become widespread by Monday afternoon, and
continue into Monday night, before moving into the Great Lakes
region. Rainfall amounts on the order of a quarter to half inch
should be common, with localized higher amounts. Previous shift
introduced the possibility of some thunder across mainly southern
portions of the region, and that appears reasonable given some
marginal instability along and in the vicinity of the upper level
trough and surface front. Will obviously have to watch this closely,
as we will have melting snow from warmer temperatures as well as
rainfall. This could lead to some water issues with time. The long
range models are in very good agreement concerning the timing and
amount of potential rainfall. The precipitation should be out of the
Northland on Tuesday. Another shortwave traveling along the
international border will bring a chance of rain/snow to the
northern quarter of MN from Tuesday into Wednesday. The weather will
then become fairly quiet, as high pressure SETTLES into the region
for the rest of the work week. The most interesting feature of the
long term forecast is the potential for a major storm system that
could arrive as early as next Friday. This is obviously an entire
week away, but we will be watching it closely. Highs from Sunday
into Wednesday will range from the 40s to lower 50s, but cool back
into the 30s by late week.
.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1128 PM CST Thu Feb 16 2017
VFR conditions were occurring across the Northland as of late
evening. There were some mid and high cloud moving through the
region but little in the way of fog and stratus has formed as of
05Z. The latest HRRR and RAP, and to a lesser extent the NAM,
have backed off on the development of stratus and fog overnight.
We have followed those trends as well. We still have some fog and
stratus forecast but are not as bullish on it`s development as
earlier forecasts. KBRD is down to a 4F temp/dewpoint depression
as of the 05Z observation, so some light fog will likely form
there over the next couple hours. Any fog and stratus that does
form tonight should lift on Friday with VFR conditions prevailing.
Surface winds will be southerly tonight for most areas then veer
gradually to west to southwest Friday night.
Issued at 506 PM CST Thu Feb 16 2017
Record Highs for February 17...
Duluth................ 52 in 1981
International Falls... 52 in 1907
Record Warmest Lows for February 18...
Duluth................ 35 in 1981
International Falls... 35 in 1981
Record Highs for February 18...
Duluth................ 53 in 1981
International Falls... 49 in 1954
Record Warmest Lows for February 19...
Duluth................ 35 in 1930
International Falls... 32 in 2016
Record Highs for February 19...
Duluth................ 51 in 1930
International Falls... 47 in 1994
Record Warmest Lows for February 20...
Duluth................ 33 in 1954
International Falls... 32 in 1915
Record Highs for February 20...
Duluth................ 54 in 1877
International Falls... 48 in 1990
Record Warmest Lows for February 21...
Duluth................ 33 in 1878
International Falls... 29 in 1981
Record Highs for February 21...
Duluth................ 57 in 1877
International Falls... 50 in 2000
.PRELIMINARY POINT TEMPS/POPS...
DLH 46 32 46 29 / 0 10 10 0
INL 47 31 42 25 / 0 10 10 0
BRD 51 31 48 30 / 0 0 0 0
HYR 48 31 48 28 / 0 0 0 0
ASX 48 32 49 30 / 0 0 0 0