Tornado Warning 1, NWS Glasgow, MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
335 PM MDT TUE JUN 30 2009

.SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH THURSDAY...
WEAK SHORTWAVE MOVING ENE ACROSS OUR AREA TODAY HAS BEEN SETTING
OFF ISOLATED...CONVECTON...WHICH EASILY STARTED EARLY IN THE VERY
UNSTABLE AIR. THIS CAN BE A SIGNIFICANT NEGATIVE FACTOR FOR SEVERE
TSTORMS THOUGH...AS IN BLOWING ITSELF OUT EARLY WHEN THE AIRMASS
IS TOO UNSTABLE AND NO CAP. THIS HAS SLOWED THINGS DOWN TODAY AS
SHOWN BY THE MORNING INVERSION YET ON SPECIAL 18Z KGGW
SOUNDING...ALSO SHOWING NOT AS UNSTABLE OF AIR AS THE 12Z SOUNDING
HAD INDICATED. CONDITIONS STILL FAVORABLE THOUGH FOR ISOLATED
SEVERE TSTORMS IN AT LEAST THE E HALF OF CWA YET...AND NOW GETTING
CLOSE TO BECOMING SEVERE ON A FEW STORMS. ALTHOUGH SHORTWAVES ARE
WEAK...FAVORABLE AREA REMAINS AHEAD OF SURFACE LOW AND
ACCOMPANYING DRY LINE. THE AIR OVER OUR SE IS VERY UNSTABLE WITH
PRECIP WATER UP TO 1.2 INCHES...AND INCREASING 0-6KM
SHEAR...LIFTED INDEXES TO -8 AND CAPES TO 3000 J/KG.

LATER TONIGHT...A COLD FRONT WILL MOVE SE ACROSS THE AREA
STARTING TO BRING IN COOLER AND LESS UNSTABLE AIR. COOL ADVECTION
CONTINUES WED...WITH AROUND 20 KT WIND AT 850 MB AT MID-DAY...SO
WIND SPEEDS MAY APPROACH LAKE WIND ADVISORY CRITERIA. THE LARGE
SCALE PATTERN HAS THE UPPER LOW OVER W CANADA SLOWLY MOVING E WITH
MAIN UPPER DYNAMICS REMAINING N IN CANADA AS WELL...JUST A FEW
ISOLATED TSTORMS INTO NE MT WED. LOOKS A LITTLE COOL FOR THE
PATTERN...WENT CLOSER TO MAV HIGHS.

A PIECE OF SURFACE PACIFIC HIGH MOVES E ACROSS S CANADA THU WITH
MINOR RIDGING ALOFT. THIS WILL GIVE SUNNY WEATHER AND WINDS ON
THE LIGHT SIDES AS MOVES E ACROSS E CANADA. SIMONSEN

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...
NO MAJOR CHANGES MADE TO THE EXTENDED FORECAST THIS PERIOD AS
LATEST ROUND OF COMPUTER MODELS HAVE MORE OR LESS HELD COURSE FROM
PREVIOUS. ZONAL FLOW ALOFT THURSDAY NIGHT BEGINS TO VEER MORE
NORTHWEST FRIDAY IN RESPONSE TO A BUILDING UPPER RIDGE OVER THE
WEST COAST. THIS UPPER RIDGE THEN MAKES ITS WAY EAST INTO WESTERN
MONTANA BY SATURDAY NIGHT AND EASTERN MONTANA BY SUNDAY AFTERNOON.
AS THE RIDGE MOVES EAST ACROSS MONTANA IT CONTINUES TO SHARPEN IN
RESPONSE TO ANOTHER TROF DIGGING SOUTH ALONG THE WEST COAST. THIS
DIGGING OF THE TROF AND SHARPENING OF THE RIDGE SLOWS THE PATTERN
AS AN OMEGA BLOCK TAKES SHAPE OVER NORTH AMERICA. THUS IT STILL
APPEARS EASTERN MONTANA SHOULD BE MORE OR LESS STILL UNDER THIS
UPPER RIDGING FOR MONDAY...AND PERHAPS EVEN TUESDAY DEPENDING ON
HOW AMPLIFIED THE PATTERN GETS. FOR NOW WILL KEEP THINGS DRY THRU
THE EXTENDED PERIOD AND ALLOW SUBSEQUENT SHIFTS TO MONITOR THE
POTENTIAL FOR STORMS NEXT TUESDAY OR WEDNESDAY AS WE WILL AT SOME
POINT AROUND THAT TIME SEE THE RIDGE AXIS MOVE INTO THE DAKOTAS
BRINGING A RETURN TO SOUTHWEST FLOW ALOFT ACROSS THE AREA. SURFACE
PATTERN FOR MOST OF THE EXTENDED LOOKS PRETTY UNREMARKABLE EXCEPT
FOR SUNDAY AND MONDAY WHERE IT APPEARS HIGH PRESSURE OVER THE
DAKOTAS AND LOW PRESSURE OVER CENTRAL MONTANA WILL SET UP A NICE
EASTERLY GRADIENT ACROSS THE AREA.

&&

.AVIATION...
VFR CONDITIONS MAINLY. HOWEVER...ISOLATED THUNDERSTORMS THIS EVENING
ARE POSSIBLE. SOME OF THESE STORMS MAY BECOME VERY STRONG TO
SEVERE. THUS SHOULD A STORM COME CLOSE TO OR DIRECTLY AFFECT A TAF
SITE...CONDITIONS AS LOW AS IFR COULD BE HAD FOR A TIME.
ADDITIONALLY...VARIABLE AND GUSTY WINDS CAN BE EXPECTED AWAY FROM
STORMS DUE TO POTENTIAL OUTFLOW BOUNDARIES. AN EAST SOUTHEAST
WIND GENERALLY AT 10-15 KT SHOULD PREVAIL TONIGHT GDV AND SDY WITH
LIGHT AND VARIABLE WINDS FOR OLF AND GGW. GAH

&&

.FIRE WEATHER...
UNUSUALLY DRY WEATHER FOR THE PAST FEW WEEKS...PARTICULARLY IN
ZONES 119...120...121...AND THE WARMER THAN NORMAL THE PAST FEW
DAYS...HAS CAUSED INCREASED CONCERN FOR FIRE WEATHER CONDITIONS.
FOR THE MOST PART...WINDS AND RELATIVE HUMIDITIES WILL NOT QUITE COMBINE
TO REACH CRITICAL FIRE WEATHER CONDITIONS THE REST OF THIS
AFTERNOON AND TONIGHT. ISOLATED STRONG TO SEVERE THUNDERSTORMS
ARE EXPECTED THOUGH. THE STRONG WINDS POSSIBLE WITH SOME OF THESE
STORMS WILL BE A CONCERN THOUGH...WITH ANY LIGHTNING FIRES THAT
THEY MAY START...OR ANY OTHER FIRES THAT EXIST. SIMONSEN

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...SEVERE THUNDERSTORM WATCH
535 FOR PORTIONS OF NORTHEAST MONTANA INCLUDING
DAWSON...ROOSEVELT...PRAIRIE...SHERIDAN...RICHLAND AND WIBAUX.

&&

WEATHER.GOV/GLASGOW

<!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>