Alert archive / Idaho / Special Weather Statements in 2015

Special Weather Statement, NWS Missoula, MT

July 23, 2015Lewis County, Idaho

NWS Missoula, MT issued this special weather statement at Jul 23, 2015, 12:49 PM PDT for Lewis County, Idaho. It was in force for 41 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: Jul 23, 2015, 12:49 PM PDT (19:49 UTC)
Expired: Jul 23, 2015, 1:30 PM PDT
In force: 41 min
Issued by: NWS Missoula, MT

County Lewis County, ID

The radar

The Pendleton radar (KPDT), 207 km from the middle of the area, began a volume at 19:51 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

Great_falls, MT (KTFX), launched 12:00Z, 7.8 hours before the alert went out and 461 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: 3046 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 35 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.

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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 Jul 23, 2:55 AM PDT, 9 hours 54 minutes earlier.

Area forecast discussion, Jul 23, 2:55 AM PDT, 9 hours 54 minutes before

<!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.
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In the hours before

Special weather statement, Jul 23, 12:12 PM PDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
112 PM MDT THU JUL 23 2015

MTZ004>006-043-232000-
MISSOULA/BITTERROOT VALLEYS MT-POTOMAC/SEELEY LAKE REGION MT-
LOWER CLARK FORK REGION MT-BITTERROOT/SAPPHIRE MOUNTAINS MT-
112 PM MDT THU JUL 23 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MISSOULA COUNTY
UNTIL 200 PM MDT...

AT 110 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
WYE...OR NEAR MISSOULA...MOVING NORTHEAST AT 25 MPH.

BRIEF HEAVY RAIN, FREQUENT LIGHTNING, AND WINDS IN EXCESS OF 30 MPH
WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
MISSOULA...LOLO...WYE...EAST MISSOULA...BONNER-WEST RIVERSIDE...
EVARO...POTOMAC...TURAH AND TWIN CREEKS.

LAT...LON 4678 11415 4697 11421 4718 11369 4684 11349
TIME...MOT...LOC 1910Z 242DEG 20KT 4693 11405

Special weather statement, Jul 23, 12:49 PM PDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1249 PM PDT THU JUL 23 2015

IDZ006>008-232030-
OROFINO/GRANGEVILLE REGION ID-SOUTHERN CLEARWATER MOUNTAINS ID-
LOWER HELLS CANYON/SALMON RIVER REGION ID-
1249 PM PDT THU JUL 23 2015

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL IDAHO COUNTY UNTIL
130 PM PDT...

AT 1248 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER GRANGEVILLE...MOVING NORTHEAST AT 35 MPH.

PEA SIZE HAIL WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GRANGEVILLE AND FENN.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. MUD AND ROCK SLIDES OVER ROADWAYS ARE POSSIBLE
DUE TO EXTREME RUNOFF. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4580 11619 4583 11637 4610 11626 4596 11596
TIME...MOT...LOC 1948Z 219DEG 29KT 4593 11617

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 12:12 PM PDT	Special Weather Statement	MSO	Missoula	48 min
Jul 23, 12:29 PM PDT	Areal Flood Advisory	MSO	Missoula	3 hr
Jul 23, 1:09 PM PDT	Special Weather Statement	MSO	Missoula	51 min
Jul 23, 2:45 PM PDT	Special Weather Statement	MSO	Silver Bow	45 min
Jul 23, 2:59 PM PDT	Severe Thunderstorm Warning	MSO	Silver Bow	17 min
Jul 23, 3:05 PM PDT	Areal Flood Advisory	MSO	Silver Bow	3 hr
Jul 23, 12:33 PM PDT	Areal Flood Advisory	MSO	Idaho	3 hr
Jul 23, 3:51 PM PDT	Special Weather Statement	MSO	Lewis	39 min

Nearby

Special Weather Statements in Idaho, 2015 Every special weather statement in 2015

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.