Alert archive / Montana / Special Weather Statements in 2016

Special Weather Statement, NWS Great Falls, MT

May 21, 2016Chouteau County, Montana

NWS Great Falls, MT issued this special weather statement at May 21, 2016, 11:49 AM MDT for Chouteau County, Montana. 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: May 21, 2016, 11:49 AM MDT (17:49 UTC)
Expired: May 21, 2016, 12:30 PM MDT
In force: 41 min
Issued by: NWS Great Falls, MT

County Chouteau County, MT

The radar

The Great Falls radar (KTFX), 73 km from the middle of the area, began a volume at 17:49 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, 5.8 hours before the alert went out and 54 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: 500 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at May 21, 10:54 AM MDT, 55 minutes earlier.

Area forecast discussion, May 21, 10:54 AM MDT, 55 minutes before

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<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>
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        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, May 21, 11:49 AM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1149 AM MDT SAT MAY 21 2016

MTZ013-045-211830-
CHOUTEAU MT-LIBERTY MT-
1149 AM MDT SAT MAY 21 2016

...SPECIAL WEATHER STATEMENT...

AT 1147 AM MDT...TRAINED WEATHER SPOTTERS REPORTED A STRONG
THUNDERSTORM NEAR FORT BENTON...MOVING NORTH AT 40 MPH. AT 1145
AM...TRAINED SPOTTERS REPORTED HALF INCH HAIL IN FORT BENTON.

HALF INCH HAIL IS LIKELY WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
FORT BENTON.

LAT...LON 4781 11059 4779 11073 4811 11096 4817 11067
TIME...MOT...LOC 1747Z 162DEG 34KT 4789 11068

MARTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 11:28 PM MDT	Special Weather Statement	TFX	Chouteau, Fergus	47 min
May 21, 12:32 AM MDT	Special Weather Statement	TFX	Blaine, Fergus	43 min
May 21, 1:22 AM MDT	Special Weather Statement	TFX	Blaine, Fergus, Hill	38 min
May 21, 10:03 AM MDT	River Flood Watch	TFX		38 hr
May 21, 3:39 PM MDT	Winter Weather Advisory	TFX		44 hr
May 21, 4:01 PM MDT	Special Weather Statement	TFX	Petroleum	14 min

Nearby

Special Weather Statements in Montana, 2016 Every special weather statement in 2016

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.