Severe Thunderstorm Warning 146, NWS Chicago, IL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
252 PM CDT WED JUL 21 2004

.DISCUSSION...

CONVECTION HAVING A TOUGH TIME THIS AFTERNOON AND 18Z DVN SOUNDING
SHOWS WHY WITH RATHER STRONG CAP AT 850MB. DEWPOINTS REACHING INTO
THE UPPER 70S ACROSS THE SOUTHERN HALF OF THE FA WITH EVEN 80 ACROSS
CENTRAL IL. DESPITE RATHER THICK CLOUD COVER...EXPECTATIONS IS THAT
THUNDERSTORMS WILL FIRE ACROSS SOUTHERN WI/NW IL AND MOVE EAST
ACROSS NORTHERN IL INTO NORTHWEST IN. NEW WW JUST ISSUED AND WILL
MAINTAIN LIKELY POPS WITH HEAVY RAIN/DAMAGING WIND WORDING FOR THIS
EVENING...THEN DRY THINGS OUT ACROSS THE NORTH OVERNIGHT. SLOWER
MOVEMENT OF THE FRONT WORKING OUT WELL AND WILL MAINTAIN CHANCE POPS
THURS AND THURS EVENING ACROSS THE ENTIRE AREA THEN JUST THE
SOUTHERN PART OF THE FA FRIDAY MORNING. TEMPS TODAY INFLUENCED BY
MORNING CONVECTION AND CLOUD COVER. EXPECTING LESS CLOUD COVER ON
THURS AND WILL STAY WITH GUIDANCE HIGHS PUSHING NEAR 90. MUCH COOLER
BEHIND THE FRONT WITH ONLY LOW TO MID 70S FOR HIGHS FRI AND SAT.
HIGH PRESSURE MOVES EAST SUNDAY INTO MONDAY HELPING TO MODERATE
TEMPS SOME. NO MAJOR CHANGES BEYOND SATURDAY.

&&

.AVIATION DISCUSSION REGARDING 18Z TAFS...

WITH ONLY LINGERING SHOWERS REMAINING IN NERN IL TAFS START OUT DRY.
ATMOSPHERE REMAINED PRIMED FOR ANOTHER ROUND OF TSTMS THIS AFTERNOON
BUT TIMING IS THE QUESTION. BEST CHANCES SEEM TO BE LATER THIS
AFTERNOON AND INTO EVENING HOURS. COOL FRONT TO DROP ACROSS AREA
AFTER MIDNIGHT WITH WINDS VEERING TO WEST. TRUE FRONT ARRIVES
THURSDAY AS WINDS SWING AROUND TO NORTHWEST.

&&

.LOT...WATCHES/WARNINGS/ADVISORIES...
.IL...NONE.
.IN...NONE.
.LK MI...NONE.

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO IL
330 PM CDT WED JUL 21 2004

ILZ003>006-008-010>014-019>022-023-032-033-039-INZ001-002-010-011-019
-221100-
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DU PAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
LAKE IN-PORTER-NEWTON-JASPER-BENTON-
330 PM CDT WED JUL 21 2004

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL
AND NORTHEAST ILLINOIS...AND NORTHWEST INDIANA.

.DAY ONE... TONIGHT

THERE IS A MODERATE RISK FOR SEVERE WEATHER THIS EVENING. THE THREAT
OF SEVERE WEATHER IS EXPECTED TO END BY 9 PM ACROSS NORTHERN
ILLINOIS AND BY 10 PM ACROSS NORTHWEST INDIANA. THE MAIN SEVERE
WEATHER THREAT WILL BE DAMAGING WINDS AND HEAVY RAIN.

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

THURSDAY AFTERNOON SHOULD SEE MORE THUNDERSTORMS AHEAD OF A COLD
FRONT THAT WILL ARRIVE IN THE REGION THURSDAY EVENING. THUNDERSTORMS
ARE EXPECTED TO CONTINUE INTO THURSDAY NIGHT. SOME OF THESE STORMS
MAY BE SEVERE.

THERE IS A CHANCE OF THUNDERSTORMS FRIDAY MORNING SOUTH OF THE
KANKAKEE RIVER.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS WILL BE NEEDED THIS EVENING.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE)

LMZ740>746-766-221100-
WINTHROP HARBOR IL TO NEW BUFFALO MI-
LAKE MICHIGAN-
330 PM CDT WED JUL 21 2004

THIS PORTION OF THE HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS
AND INDIANA WATERS OF LAKE MICHIGAN.

.DAY ONE... TONIGHT

THERE IS A MODERATE RISK FOR SEVERE WEATHER ACROSS SOUTHERN LAKE
MICHIGAN BEFORE 10 PM CDT. THE MAIN SEVERE WEATHER THREAT WILL BE
DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

THURSDAY AFTERNOON SHOULD SEE MORE THUNDERSTORMS AHEAD OF A COLD
FRONT THAT WILL ARRIVE IN THE REGION THURSDAY EVENING. THUNDERSTORMS
ARE EXPECTED TO CONTINUE INTO THURSDAY NIGHT. SOME OF THESE STORMS
MAY BE SEVERE.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE
NWS CHICAGO WEBPAGE: WWW.CRH.NOAA.GOV/LOT (LOWER CASE)

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
448 PM CDT WED JUL 21 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0442 PM     TSTM WND DMG     WILLOWBROOK             41.76N 87.95W
07/21/2004                   DUPAGE             IL   AMATEUR RADIO

            ESTIMATED WIND GUSTS TO 65-70 MPH. LARGE TREE LIMBS DOWN.
            REPORTED NEAR INTERSTATE 55 AND ROUTE 83.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
454 PM CDT WED JUL 21 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0427 PM     HAIL             ROMEOVILLE              41.65N 88.09W
07/21/2004  0.75 INCH        WILL               IL   EMERGENCY MNGR

0425 PM     FLOOD            AURORA                  41.77N 88.29W
07/21/2004                   KANE               IL   TRAINED SPOTTER

            MINOR STREET FLOODING.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
503 PM CDT WED JUL 21 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0458 PM     TSTM WND DMG     CHICAGO RIDGE           41.70N 87.78W
07/21/2004                   COOK               IL   EMERGENCY MNGR

            TREE LIMBS DOWN.

0501 PM     NON-TSTM WND DMG BRIDGEVIEW              41.74N 87.81W
07/21/2004                   COOK               IL   AMATEUR RADIO

            SEVEN INCH DIAMETER TREE SNAPPED IN HALF AT 87TH AND
            ROBERTS.

&&