Alert archive / Montana / Special Weather Statements in 2012

Special Weather Statement, NWS Missoula, MT

April 24, 2012Lincoln County, Montana

NWS Missoula, MT issued this special weather statement at Apr 24, 2012, 4:48 PM MDT for Lincoln County, Montana. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 24, 2012, 4:48 PM MDT (22:48 UTC)
Expired: Apr 24, 2012, 5:30 PM MDT
In force: 42 min
Issued by: NWS Missoula, MT

County Lincoln County, MT

The radar

The Spokane radar (KOTX), 157 km from the middle of the area, began a volume at 22:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.8 hours before the alert went out and 78 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 0 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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>

What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this special weather statement went out at Apr 24, 2:53 PM MDT, 1 hour 55 minutes earlier.

Area forecast discussion, Apr 24, 2:53 PM MDT, 1 hour 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
253 PM MDT TUE APR 24 2012

...MODERATE TO HEAVY RAINFALL AND COOLER TEMPERATURES EXPECTED
THURSDAY INTO FRIDAY...
...RIVERS AND STREAMS EXPECTED TO RISE AND RUN HIGH THROUGH THE
WEEK...

.DISCUSSION...SCATTERED SHOWERS AND THUNDERSTORMS THIS AFTERNOON
AND EVENING AND ONCE AGAIN WEDNESDAY AFTERNOON AND EVENING AS A
COUPLE OF WEATHER DISTURBANCES MOVE THROUGH THE REGION. IMPACTS
FROM STORMS WILL BE SMALL HAIL SOME BRIEF GUSTY WINDS AND BRIEF
HEAVY RAIN.

THE MAJOR WEATHER STORY THIS WEEK IS HEAVY RAIN LATE WEDNESDAY
NIGHT AND THUR DAY...COOLER TEMPERATURES AND FLOODING ISSUES ACROSS THE
NORTHERN ROCKIES. THE LONGWAVE TROF RESPONSIBLE FOR USHERING IN
ADDED MOISTURE AND WEATHER DISTURBANCE WILL MOVE ONSHORE WEDNESDAY
NIGHT AND THURSDAY. CONFIDENCE IS HIGH THIS SYSTEM WILL BRING
RAIN...HEAVY AT TIMES. CONFIDENCE IS ALSO HIGH THE LOCATION FOR
THE HEAVIEST RAIN WILL BE IN CENTRAL IDAHO AND NORTHWEST MONTANA
WHERE AN INCH OF RAIN...LOCALLY MORE ARE EXPECTED

MAJOR IMPACTS FROM THIS SYSTEM ARE:

...SMALL STREAM AND CREEK FLOODING.
...MAIN RIVER FLOODING AT THOMPSON FALLS...YAAK RIVER...FISHER RIVER
NEAR LIBBY

...MUCH COLDER TEMPERATURES FRIDAY WITH HIGHS ONLY IN THE 40S.
...WINDY CONDITIONS DURING COLD FRONTAL PASSAGE THURSDAY NIGHT/FRIDAY.

THIS SYSTEM WILL LEAVE THE REGION LATE FRIDAY. SCATTERED SHOWERS
WILL OCCUR BEHIND THIS SYSTEM. EXPECT AN UNSETTLED AND COOLER
WEEKEND COMPARED TO LAST WEEKEND'S RECORD WARM CONDITIONS.

&&

.AVIATION...SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE
EVENING HOURS FOR ALL THE TERMINALS. SEVERAL WEAK WAVES WILL
AFFECT BOTH KSMN AND KBTM LATER IN THE EVENING KEEPING THE CHANCE
FOR ACTIVITY THROUGH AT LEAST 25/0600Z. THE MAIN THREATS WITH THE
THUNDERSTORMS WILL BE SMALL HAIL...GUSTY WINDS...BRIEF HEAVY RAIN
AND LIGHTNING. WIND GUSTS TO 40 KTS ARE POSSIBLE FROM KSMN TO KBTM
ASSOCIATED WITH THE STORMS. GUSTY WINDS DUE TO THE WIND GRADIENT
AND GOOD MIXING WILL DIMINISH BY 25/0300Z BUT THE THREAT FOR
THUNDERSTORM GUSTS WILL BE POSSIBLE THROUGH 25/0600Z. THE
THUNDERSTORM ACTIVITY SHOULD DIMINISH OVERNIGHT BUT THERE IS STILL
A CHANCE FOR ISOLATED SHOWERS ESPECIALLY NEAR KMSO AND KSMN.
EXPECT MORE THUNDERSTORM ACTIVITY TO DEVELOP BY 25/1800Z ON
WEDNESDAY.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...NONE.
ID...NONE.
&&

SHORT TERM...RPN
LONG TERM....RPN
AVIATION...NOBLE/KITSMILLER

In the hours before

Special weather statement, Apr 24, 4:48 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
448 PM MDT TUE APR 24 2012

MTZ001-004-242330-
KOOTENAI/CABINET REGION-LOWER CLARK FORK REGION-
448 PM MDT TUE APR 24 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SANDERS AND SOUTHERN
LINCOLN COUNTIES UNTIL 530 PM MDT...

AT 442 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 9 MILES SOUTHEAST OF MULLAN...OR 15 MILES EAST OF
WALLACE.  THE STORM IS MOVING EAST AT 30 MILE PER HOUR.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...LIBBY AND HERON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4815 11533 4803 11606 4827 11607 4846 11561
TIME...MOT...LOC 2247Z 180DEG 0KT 4741 11561

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 24, 2:44 AM MDT	Areal Flood Warning	MSO	Lincoln	4 days
Apr 24, 6:07 AM MDT	Areal Flood Warning	MSO	Lincoln	4 days
Apr 24, 12:04 PM MDT	Areal Flood Warning	MSO	Mineral, Missoula, Ravalli	24 hr
Apr 24, 12:05 PM MDT	Areal Flood Warning	MSO	Mineral, Missoula, Ravalli	102 min
Apr 24, 1:58 PM MDT	Areal Flood Warning	MSO	Sanders	23 hr
Apr 24, 2:05 PM MDT	Areal Flood Advisory	MSO	Missoula, Ravalli	4 days
Apr 24, 5:27 PM MDT	Special Weather Statement	MSO	Clearwater	48 min

Nearby

Special Weather Statements in Montana, 2012 Every special weather statement in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.