29. A warm-up is beginning. Weak low pressure tonight and a stronger one on Monday.
A high pressure centered over the Ohio Valley at 1040 mb (30.72 "Hg) will continue sliding east, allowing southerly winds to bring warmth northward from the southern States.
Broad low pressure has begun to organize in the central and northern plains that will also march eastward. The NWS discussion from Duluth mentions the system deepening as it moves east, but I've looked at the models and just don't see it.
Last night was the last of the deep cold... for now.
Some of the cooler reports from last night across northern Wisconsin:
The map (to the left) shows a generalization of low temperatures last night.The map is from Qwikcast.com.
Light snow tonight and tomorrow. The map (to the right) is NWS Duluth's Weather Story for today. As the first low pressure system passes through the area tonight it could give most of the Upper Mississippi Valley an inch of snow. A few locations could see two inches.
Highs today should reach into the 20s, though I'm doubtful it will happen here, I currently have 16.9 degrees at 13:05. The last time I recorded a high temperature in the 20s was on the 16th, nine days ago.
The forecast calls for temperatures to stay above 0 for the entire region tonight, mid 20s for tomorrow's highs, and just above 30 degrees on Sunday.
Then attention turns to Monday as a possible system has been showing up on the models.
GFS Model at 84 hours from now.
Models are starting to agree on location and strength of the low pressure system. The map(to the left) shows the GFS model at 18:00 on Monday (28th).
The most recent discussion from NWS Duluth indicates:
"GFS INDICATING MUCH MORE PRECIPITATION AHEAD OF THE SYSTEM... WITH SOME SNOW AND FREEZING RAIN POSSIBLE. WILL DEFINITELY HAVE TO KEEP AN EYE ON THIS INTENSE SYSTEM."
The tight pressure gradient still makes me think that strong winds will be a problem, as well as the type of precipitation... rain or ice or sleet or snow?