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NWS Chicago Profile picture
@NWSChicago
Dec 21, 2022 • 5 tweets • 4 min read • Read on X
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.Wed AM update! 1) Key messages on the dangerous winter weather Thursday into the holiday wknd. A powerful storm system will bring strong winds, falling and blowing & drifting snow, & extreme cold. Worst conditions: Thu-Fri. Threat for flash freeze on Thursday! #ILwx #INwx (1/5) Headline: Significant Winter Storm Ahead. Key Messages: Sno
.2) Timeline graphic showing our latest thoughts on the upcoming dangerous winter weather. Travel conditions will likely rapidly deteriorate on Thursday AM through the afternoon from west to east. A flash freeze may cause icy roads during the accumulating snow! #ILwx #INwx (2/5) Headline: Significant Winter Storm Ahead. Sub Headline: Tim
.Impacts from the storm will be driven by combination of cold, wind & snow rather than snow alone. Don’t let your guard down from the moderate amounts of snow forecast; combined effects will lead to dangerous travel conditions which can become life threatening. #ILwx #INwx (3/5) Headline: Significant Winter Storm Ahead. Sub Headline: Sno
.Ground blizzard conditions: Even without major snowfall, strong winds lofting fresh snow can create treacherous travel due to near whiteout conditions, especially in open areas. Exposed north-south roads will be most susceptible to being drifted over with snow. #ILwx #INwx (4/5) Headline: Significant Winter Storm Ahead. Sub Headline: Wha
.In addition to falling and blowing snow, extreme cold will worsen the dangerous conditions Thu & Fri. Wind chills will drop to as low as 35 degrees below zero early Friday morning. Once the snow stops, dangerous cold will continue through the holiday weekend. #ILwx #INwx (5/5) Headline: Significant Winter Storm Ahead. Sub Headline: Dan

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More from @NWSChicago

NWS Chicago Profile picture
Jul 22
Good afternoon! We continue to work through hundreds of damage points from last week's severe weather. This thread will cover the latest information specific to the 7/15 (Monday) derecho. A summary map of all confirmed tornadoes from 7/15 is below. (1/10) Image
We have confirmed an additional 3 tornadoes, bringing the event total to 27. The new tornado
confirmations are: 1. Maple Park (EF-Unknown*), 2. O'Hare Airport (EF-0), and 3. Country Club Hills
(EF-0). The track maps for these 3 tornadoes are below. (2/10)

Image
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An EF-Unknown rating was assigned to the Maple Park tornado because it remained entirely in fields, for which no damage indicators/wind speed ratings currently exist. (3/10)
Read 10 tweets
NWS Chicago Profile picture
Feb 27
Check out this thread 🧵for our morning forecast graphics. Be sure to check these out this morning, we are in for an absolutely wild meteorological ride🎢with summer (record warmth), spring (severe storms?), and winter (snow/cold) weather all crammed into the next 24 hours!
Scattered t-storms are expected this evening (6PM til Midnight) with some of the storms potentially becoming severe. The primary threat is large hail, possibly up to 2” inches diameter. There is also a threat of locally damaging winds and a tornado or two. #ilwx #INwx Headline: Severe T-storms Possible This Evening. Sub Headline: Scattered severe thunderstorms possible after sunset. Scattered Severe T-Storms May Produce. ✔ Have multiple ways to get weather warnings. ✔ Stay tuned for the latest forecast updates. What You Should Do. What To Expect. Scattered t-storms. 6 PM - Midnight CST. All Thunderstorms Can Produce. Downpours. Will cause slowed driving. Lightning. Destructive Hail. (Up to 2”/diameter). Damaging Winds. Up to 60 mph. A Tornado Or Two. Graphic Created: Tuesday, February 27, 2024 5:39 AM CST
A powerful cold front will race quickly across the area this evening producing a 20-30°F temperature drop in just an hour or so and strong northwest winds gusting to 35-45 mph. A brief period of gusts over 50 mph are possible (30-40%) immediately behind the front. #ilwx #INwx Headline: Powerful Cold Front Tonight. Sub Headline: Rapidly falling temperatures and very strong and gusty winds behind the front. Approximate Cold Front Timing. What You Should Do. What To Expect. ✔ Secure loose objects outdoors. ✔ Prepare for MUCH colder temps Wed A.M. Strong Northwest Winds. Gusts 35-45 mph likely behind the front late tonight and continuing Wednesday. Rapid Temperature Drop. 20-30°F temperature drop in just an hour or so. Brief Period of Damaging Winds?. 30-40% chance of wind gusts over 50 mph immediately behind the cold front. Graphic Created: Tuesday,...
Read 6 tweets
NWS Chicago Profile picture
Dec 22, 2022
[3:20 PM CST 12/22] Here are key messages for the continued winter weather through tomorrow. Gusty winds and dangerously cold temperatures will become the norm tonight and especially Friday. Stay indoors, if you can! #ILwx #INwx Headline: Winter Weather Threats Continue. Key Messages: Sn
Although snow will taper from west to east overnight, increasingly gusty winds will lead to areas of blowing snow reducing visibility especially in open and rural areas. North to south-oriented roadways will be most susceptible to blowing snow. #ILwx #INwx Headline: Winter Weather Threats Continue. Sub Headline: Gu
Temperatures will continue falling through the overnight hours with gusty winds leading to dangerous wind chills as low as 30 to 35 degrees below zero! If you must venture outdoors, cover up from head to toe in multiple layers. #ILwx #INwx Headline: Winter Weather Threats Continue. Sub Headline: Ex
Read 4 tweets
NWS Chicago Profile picture
Dec 22, 2022
.Thu 12/22 AM Update! 1) Key Messages for the Dangerous Winter Weather Today-Early Saturday:
Conditions will deteriorate quickly late AM-aftn hours with snow, gusty winds & plummeting temperatures. The snow will taper on Friday though dangerous cold will remain. #ILwx #INwx (1/6) Headline: Dangerous Winter Weather Expected. Key Messages:
.Arrival time of hazardous travel conditions today: Arctic front will sweep across the area from late AM thru early aftn from west to east, with accumulating snow, plummeting temps & gusty winds. A flash freeze may cause ice covered roads, topped by the snow. #ILwx #INwx (2/6) Headline: Dangerous Winter Weather Expected. Sub Headline:
.Periods of whiteout (blizzard) conditions likely later today thru Fri. night, especially in open areas. North-south roads most susceptible to blizzard conditions & drifts due to strong west-NW winds. With -30 to -40 wind chills, getting stranded can be deadly! #ILwx #INwx (3/6) Headline: Dangerous Winter Weather Expected. Sub Headline:
Read 6 tweets
NWS Chicago Profile picture
Dec 20, 2022
[4:00 AM 12/20] Confidence in a major winter storm continues to increase for the Thursday to Saturday time frame. Blizzard conditions are possible, and travel looks to become severely impacted, particularly Thursday night through Friday afternoon. #ILwx #INwx Image
This is an updated timeline graphic showing our latest thoughts on the upcoming major winter storm. Travel conditions will likely rapidly deteriorate Thursday afternoon and evening. #ILwx #INwx. Image
Here is a look at areas expected to see the most dangerous travel conditions. Rapidly deteriorating travel conditions are expected across Illinois through Thursday afternoon. If possible, consider alternate travel plans! #ILwx #INwx Image
Read 5 tweets
NWS Chicago Profile picture
Dec 19, 2022
Major winter storm Thu thru Sat with heavy snow, strong winds, severe blowing/drifting snow & bitter cold. The worst conditions will develop Thu evening & continue into Fri evening when a full fledged blizzard is possible along with dangerously cold temp. #ilwx #inwx Headline: Significant Winte...
This is a look at impacts over space and time for the expected winter storm. Note the large footprint of this system, so travel will be impacted over much of the Upper Midwest and Great Lakes. Headline: Significant Winte...
A significant winter storm is going to impact the region later this week. While some accumulating snow is possible during the day Thu, the most dangerous conditions, including a potential blizzard, is expected to develop Thu night & continue through Friday and Friday night. Headline: Significant Winte...
Read 5 tweets

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