Storm To Deliver Snow, Record Cold, Record Heat, Flooding Rain, Severe Wx, Tornadoes!

Written by on April 13, 2014 in United States of America with 0 Comments

A text book spring storm is winding upright now over the Plains and is drawing on all resources from summer-like warmth and tropical humidity to arctic cold. The next 24 to 36 hours will see upper 80s to low 90s reach Oklahoma while western Kansas struggles to get out of the low 40s. After enjoying 70s and 80s just yesterday, Denver, Colorado will be stuck in the 30s with snow, wind and wind chill today into tomorrow with temperatures dropping into the 10s.

Warm highs yesterday across the US. First 80 for Chicago!

Source: weather.com

Source: weather.com

Current view from Casper, Wyoming…

Source/Credit: wyroads.com/camscape

Source/Credit: wyroads.com/camscape

Severe weather will develop as all the ingredients come together over the Southern Plains (see video for explanation).

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SEE TODAY’S VIDEO!

TOP IMAGE: Courtesy/Credit of NASA

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As for the Lower Mississippi Valley into the Tennessee and Ohio Valleys, rainfall will be in the 1-3, locally 6 inch range over the next 36 hours which is sure to cause road closures due to flash flooding. It’s another day of 80s throughout the Mid-Atlantic including DC, Baltimore and Philadelphia. The first 70s are expected today and tomorrow up into Boston.

Here’s the GFS surface/850mb temps/2 metre temp charts f0r late this afternoon showing everything coming together.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Close-up of late afternoon 2 metre temperatures over the Southern Plains. Note the tongue of mid to upper 90s push into central and eastern Oklahoma but the sub-50 line drops into northwest Oklahoma. So, upper 40s in the NW, potentially near 90 in S-cent areas. Quite the contrast!

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

We’re talking about a strong northwest wind in the upper levels or at the 500mb level, then a screaming low level jet (mid levels or at 850mb) and a southeast flow which will transport the warmth and humidity north from the Gulf of Mexico. All these winds blowing from different directions and at different altitude, this drives the ‘turning’ with the atmosphere.

Here’s the forecasted low level jet wind speeds. 60 to 70kts out of the SW.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Closer look.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

So, we have the necessary turning within the atmosphere and the tight thermal gradient but there’s also a HIGH LAPSE RATE which is the temperature difference with height. The greater the vertical temperature difference, the greater the upward motion and thunderstorm development potential.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Here’s today’s severe weather/tornado threat area according to weather.com

Source: weather.com

Source: weather.com

Tomorrow.

Source: weather.com

Source: weather.com

This system will be a big snow maker for the Rockies with 3-6 inches widely over Wyoming and Colorado below 8,000ft, above that level and your talking 8-14, locally 2ft of snow.

Denver, Cheyenne and Casper is likely to pick up between 4-8 inches. Major cold follows.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

GFS lows tomorrow morning.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Note the -15 in northwest Wyoming. Expect 10s for Denver and Cheyenne after daytime readings in the mid-30s today following 72 in Denver yesterday, 81 on Friday.

Snow is possible across the central Plains into the Lower Midwest where Des Moines, Chicago and Madison which have been in the 70s and 80s, could see measurable snow as colder air sweeps in on the backside.

Monday into Tuesday, the system pushes through the Appalachians and coastal plain bringing heavy, localised flooding rains and locally severe weather. Note the chill diving all the way to Arkansas on the backside.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

GFS has 20s deep into Arkansas Tuesday morning.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

Another Snow Potential Late Week For Denver!

Another system pushes across the Rockies through the second half of the work week.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

As well as snow, that looks like a COLD air mass for this time of year, check out those thicknesses!

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

850mb temps.

Courtesy/Owned by AccuWeather Pro

Courtesy/Owned by AccuWeather Pro

CFSv2 shows chill week 1-2 but warmer air takes charge week 3 and 4, better hope so given that we’re into MAY by then…

wk1_wk2_20140412_NAsfcT

wk3_wk4_20140412_NAsfcT

See today’s video for more.

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