Tuesday, February 20, 2018

Rain totals Through Tuesday

Rain totals per NWS:

STERLING 4.3 NE * : 1.24
DE KALB 0.7 SW * : 1.23
 BYRON 3.2 N * : 1.15
MOUNT MORRIS 0.3 S * : 1.13
DIXON 3.0 NNW * : 1.0
ROCKFORD 1.5 ENE * : 1.02
WOODSTOCK 3.8 SW * : 0.97
BULL VALLEY 2.5 WNW * : 0.96
WONDER LAKE 0.8 WNW * : 0.95 
CAPRON 0.1 N * : 0.83
ROCKFORD 0.7 NW * : 0.80
 ROSCOE 1.6 ESE * : 0.70

 Green County
WSW Monroe 1.88 in
2 SE Monticello 1.52 in
 Brodhead 1.27 in
 New Glarus 1.10  im

...Rock County...
2 SW Janesville 2.80 in
 Milton-WWTP 1.75 in
 2 E Janesville 1.67 in
3 W Janesville 1.61 in
3 S Edgerton 1.48 in
 2 W Beloit 1.40 in
Argyle 1.34 in
Beloit 1.07 in
 2 NNW Clinton 0.63 in

...Walworth County...
East Troy 2.5 NNE 1.15 in
 Genoa City 0.97 in 
 Lake Geneva 0.88 in
 Pell Lake 0.86 in
 1 NNE Darien 0.76 in
2 SW Delavan Lake 0.71 in
 Lyons 0.66 in
Whitewater 0.64 in
 Elkhorn 0.58 in  

Tuesday Morning Update

Another round of rain and thunder moving northeast - heavy rain at times. Watch for ponding on roads and minor flooding.


(6:35 AM) nwsbot: Local Storm Report by NWS LOT: Rochelle [Ogle Co, IL] co-op observer reports HEAVY RAIN of M1.25 INCH at 06:00 AM CST -- 24 hour rainfall.

(8:19 AM) nwsbot: Local Storm Report by NWS DVN: 3 ENE Rock Falls [Whiteside Co, IL] trained spotter reports HEAVY RAIN of M1.25 INCH at 08:14 AM CST -- event total up to 7 am.

(8:04 AM) nwsbot: Local Storm Report by NWS DVN: 1 WNW Morrison [Whiteside Co, IL] trained spotter reports HEAVY RAIN of M1.00 INCH at 08:04 AM CST -- 

(8:33 AM) nwsbot: Local Storm Report by NWS DVN: 2 SSE Schapville [Jo Daviess Co, IL] trained spotter reports HEAVY RAIN of M1.84 INCH at 08:30 AM CST -- rainfall in the past 24 hours.

(5:29 AM) nwsbot: Local Storm Report by NWS LOT: Woodstock [Mchenry Co, IL] co-op observer reports HEAVY RAIN of M0.96 INCH at 05:00 AM CST -- 24 hour rainfall amount since 5 am monday.

Heavy  rain passing over Roscoe and Beloit this morning, adding to flooding concerns. Beloit Police saying "due to the extended rains causing flooding, McKinley is being closed between Burton and Newark. Remember turn around, don’t drown." Flood warnings are still in place across southern Wisconsin this morning. Be careful and watch for ponding and localized flooding!

Embedded heavy rain within general area of showers this morning as you head out the door. Rain will continue through the morning, with a break expected mid morning. With rain totals between .25" to 1" already this morning, from yesterday and overnight, you'll be running into standing water. As mentioned in the previous post, there has been water over some area roads in southern Wisconsin. With the frozen ground, there is a lot of localized flooding and ponding in yards and some roads this morning. With more waves of rain expected this afternoon ahead of our cold front, the ponding and local flooding will continue to be a concern.

Along with the rain, fog is still an issue this morning. Northern Illinois is no longer under a dense fog advisory, but there are still areas of locally dense and thick fog. Fog will linger through the afternoon, until the cold front passes through.

Monday, February 19, 2018

Flooding Already Occurring Monday Evening

(9:36:49 PM) nwsbot: Local Storm Report by NWS MKX: Monroe [Green Co, WI] emergency mngr reports FLOOD at 09:25 PM CST -- numerous roads with standing water across the county. barricades out. local creek at high level and spilling into floodplain.

(10:21:45 PM) nwsbot: Local Storm Report by NWS MKX: Janesville [Rock Co, WI] law enforcement reports FLOOD at 09:30 PM CST -- numerous roads closed due to flooding across the county.

Heavy rainfall earlier Monday evening has caused flooding over parts of Green and Rock counties in southern Wisconsin.  Emergency managers are reporting standing water over many roads in Monroe (Green County) with numerous barricades up and local creeks beginning to spill into the floodplain.

Areas over southern Wisconsin and northwest Illinois did experience periods of moderate to heavy rain late Monday afternoon with anywhere from a half an inch, up to three quarters of an inch coming down.

Another round of moderate to heavy rain is moving in from the southwest with the heaviest rainfall focused more over Lee and DeKalb counties.  Additional rainfall coming in from the southwest will move to the northeast through at least Midnight.  With the rainfall moving in this evening and early overnight, an additional half an inch, up to an inch of rain could fall.  The rain showers may lighten a little during the overnight, but a second round of heavy rain will move in before sunrise Tuesday.

An Areal Flood Warning continues for the following counties: Green, Rock and Walworth counties

Locally Dense Fog will Make Travel Difficult Monday Night and Early Tuesday

A Dense Fog Advisory has been issued for most of northern Illinois and southern Wisconsin through Tuesday morning.  Very dense fog brought visibility down to only a couple hundred feet Monday afternoon and evening.

There has been a little improvement with some of the rain showers and warm front lifting northward, but locally dense fog will continue for many into Tuesday morning.

A warm front currently lies just south of the Wisconsin state line Monday evening as winds in Monroe and Janesville are still from the east and northeast.  South of the front in Illinois winds have shifted around to the south, but there has been little improvement in the fog.

Please remain aware that dense fog will continue into Tuesday morning and will be impactful to the morning commute.  There could also be moderate rainfall occurring around sunrise Tuesday, with a few embedded thunderstorms.

Low Visibility Through the Afternoon

Along with it being a soggy couple of days, it will also be foggy. We've seen already this morning light scattered showers lifting north across the Stateline, but over the last few hours visibility has dropped as well. Visibility is generally around a mile for most, though will turn a bit more dense in localized places.

This happens as warm moist air is brought northward, moving over the snow pack we have across northern Illinois and southern Wisconsin. With already a lot of moisture already lifting north due to an incoming warm front, the melting snow is also adding to the moisture in the atmosphere.

This will keep fog around through the afternoon, but once we get a bit more widespread rain, it will help to get rid of the fog. Of course then we have to deal with periods of rain, some of which will be heavy. The heavier rain arrives later today and tonight, through Tuesday.

Temperatures at least will have a spring-like feel, as we climb into the upper 40's and low 50's both today and Tuesday.

Sunday, February 18, 2018

Flood Threat Monday Evening and Tuesday

A Flood Watch has been issued for most of northern Illinois and southern Wisconsin beginning Monday evening and lasting through Tuesday evening.  Heavy rainfall combined with rapid snow melt, along with a frozen ground could cause a rapid rise on some of the smaller rivers, creeks and streams.  Low lying areas that are also prone to flooding should be on the lookout as well.

South winds Sunday evening will remain gusty, but hold temperatures in the mid 30's overnight.  As a warm front slowly begins to approach from the south, rain showers will begin to develop over parts of southeast Iowa and west-central Illinois after Midnight, becoming a little more widespread after 3am.  Most of this activity should remain should of the immediate area but there could be some drizzle or light showers that move in south of Rockford prior to sunrise Monday.
As moisture continues to get pulled in from the south, fog will become a concern and could become dense through Monday morning.  Rain showers will then become more widespread through the morning Monday and into the afternoon with the arrival of the warm front.  You may even hear a few rumbles of thunder.

Temperatures will warm into the 40's during the afternoon, reaching close to 50 degrees late in the day.  Periods of heavy rain will occur through Monday evening, and then again during the first half of Tuesday before a cold front passes Tuesday evening.

Rainfall amounts between one and two inches will be very common over northern Illinois and southern Wisconsin, with higher amounts to the southeast. 

The current frost depth over northern Illinois and southern Wisconsin is anywhere between six and twelve inches (a little deeper north of Janesville).  This won't allow much opportunity for any rain that does fall, or snow that melts, to soak into the ground.

Further north travel could become very dangerous with ice accumulations likely over parts of central Wisconsin.  An Ice Storm Warning has been issued for a handful of counties north of Madison, while Winter Storm Watches and Winter Weather Advisories have been issued further to the north and northwest. 

Saturday, February 17, 2018

A Taste of Spring

This is what we were greeted with heading into the afternoon.  Isolated snow showers taking over the Stateline, with lighter snow elsewhere.  Luckily the moderate snow showers stayed isolated, so most of us more than likely saw around half an inch, with an inch of snow at most.  The snow is now gone, and fortunately we won't be seeing it again for a while.

As we head into Sunday a low pressure system will move in from the west.  However, the warm front will stay up north in Wisconsin, so all we have to deal with is warm temperatures and plenty of sunshine!  This warm end to the weekend is just the beginning for the spring-like warmth that's right around the corner.

That low pressure system will end up warming us into the low 50's by the time we reach Monday.  Spring will definitely make a presence that day, as heavy rain showers will be expected alongside those 50° temperatures.  Lingering instability will bring another round of showers on Tuesday, where temperatures will stay fairly warm in the upper 40's.

Even though the warmer weather will be nice next week, it does come with a consequence.....flooding concerns.  The abnormally warm air on Monday will quickly melt the remaining snow, adding a good amount of liquid to the ground. 

On top of that will be heavy rain showers, so these two factors could lead to some flooding Monday night, and with the extra round of rain on Tuesday, that'll only add to the ground liquid, so definitely be mindful of the flooding potential that'll be present as we head into the work week.

Afterwards, sunshine is expected mid-week, with temperatures slightly cooling off into the mid to upper 30's.  Another chance for light rain arrives Friday, with sunshine looking probable next Saturday.