Latest radar trends shortly after 1:30pm indicate that the area of showers and thunderstorms that has brought some heavy rainfall to portions of the Chicago Metro area is lifting out of the area to the north and east. Skies are brightening and there may even be some sunshine this afternoon.
Rain exiting the Chicago area
Here are the latest rainfall totals..
O'Hare Airport 1.56 inches
West Chicago 1.29 inches
Wheeling 1.29 inches
Aurora-Sugar Grove 0.81 inches
Midway Airport 0.65 inches
Reports from WeatherBug sites
Wilmette 1.93 inches
Niles 1.67 inches
Highland Park 1.42 inches
Morton Grove 1.41 inches
Palatine 1.05 inches
Wheaton 1.00 inch
Arlington Heights 0.95 inches
Showers and thunderstorms have been moving through the Chicago Metro area overnight and this morning and are continuing this afternoon. The National Weather Service has issued an areal flood advisory this afternoon for portions of northern Cook and northeast Du Page counties until 3:30 pm for possible flooding along streams and creeks and in low-lying areas. More than an inch of rain has fallen so far and another half inch to an inch may fall this afternoon.
Heavy rain hitting portions of the Chicago Metro area
Gene Blevins, Reuters, May 21, 2013
I've tried to sort through the myriad of resources with information regarding the Moore tornado and selected a few that stand out.
The most important link is how to help victims of the tornado.
http://twitter.com/WGNWeatherGuy
http://www.facebook.com/TimMcGillWeatherGuy
Our once chilly spring has wasted no time in playing catch-up! 2013, with nine 80s to its credit through May 21, is now well ahead of the long term average of 5 such days. And while, sharp cooling back to April-level temps is to hit Thursday with the arrival of gusty north to northeast winds, strong warming is to return 80s and higher humidities to the area next week.
Rainy spells and sporadic thundery downpours to bolster impressive late Monday/Tuesday precip totals
Waves of showers and thunderstorms greet area residents Wednesday and Wednesday night. It’s a development likely to add to the impressive rain tallies observed over a wide swath of the area Monday and Tuesday .
Grundy County's Braceville reported 3.44" during that period while 2.11" came down at Lisle, 2.05" Glen Ellyn; 2.04" Naperville and 1.99" at Villa Park.
Weather Service storm survey teams rate the Newcastle/Moore, Oklahoma twister an EF-5; only 59 comparably strong tornadoes on the books nationwide since 1950
It’s official. The deadly and devastating tornado which roared into Newcastle and Moore, Oklahoma has been rated EF-5 and joins the short list of 59 comparably devastating twisters on the books across the U.S. at the Storm Prediction Center since 1950.
Dear Tom,
Is the humidity always 100 percent when it is raining?
-- Janis Norm, Rockford?
Dear Janis,
No, it is not. Rain can occur in many different kinds of weather situations. For example, consider the situation that meteorologists refer to as “overrunning.” It’s an atmospheric event that occurs most frequently during the colder portion of the year.
Warm, moist air (with a humidity of 100 percent) from which rain (or snow) is falling spreads up and over a layer of cooler air at ground level. Typically, the cool layer is several hundred to a few thousand feet deep, and it is usually relatively dry in comparison with the warmer air above. Relative humidity at the surface, sometimes below 80 percent, reflects the moisture content of the surface air into which rain is falling from warmer, saturated air above.
Below is a copy of the actual tornado warning issued for what was to become the
deadly EF-5 Moore tornado. the warning was issued with a 36 minute lead time before
the twister struck the area and was issued 16 minutes before the twister first touched
down.
The warning contains verbiage of the new impact-based warnings being issued by
the National Weather Service which employs tougher language in the call to
action statements to urge people to take protective action NOW. The enhanced
wording is bolded in the text below.
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
301 PM CDT MON MAY 20 2013
THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A
* TORNADO WARNING FOR...
NORTHWESTERN MCCLAIN COUNTY IN CENTRAL OKLAHOMA...
SOUTHERN OKLAHOMA COUNTY IN CENTRAL OKLAHOMA...
NORTHERN CLEVELAND COUNTY IN CENTRAL OKLAHOMA...
* UNTIL 345 PM CDT
* AT 259 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS AND STORM
SPOTTERS WERE TRACKING A LARGE AND EXTREMELY DANGEROUS TORNADO NEAR
NEWCASTLE. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 20
MPH.
THIS IS A TORNADO EMERGENCY FOR MOORE AND SOUTH OKLAHOMA CITY.
IN ADDITION TO A TORNADO...LARGE DESTRUCTIVE HAIL UP TO TENNIS BALL
SIZE IS EXPECTED WITH THIS STORM.
* LOCATIONS IMPACTED INCLUDE...
MIDWEST CITY...MOORE...NEWCASTLE...STANLEY DRAPER LAKE...TINKER AIR
FORCE BASE AND VALLEY BROOK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. IF YOU
CANNOT GET UNDERGROUND GO TO A STORM SHELTER OR AN INTERIOR ROOM OF A
STURDY BUILDING NOW.
TAKE COVER NOW IN A STORM SHELTER OR AN INTERIOR ROOM OF A STURDY
BUILDING. STAY AWAY FROM DOORS AND WINDOWS.
&&
