Alert archive / Wyoming / Special Weather Statements in 2019

Special Weather Statement, NWS Cheyenne, WY

July 1, 2019

NWS Cheyenne, WY issued this special weather statement at Jul 1, 2019, 2:01 PM MDT. It was in force for 44 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 1, 2019, 2:01 PM MDT (20:01 UTC)
Expired
Jul 1, 2019, 2:45 PM MDT
In force
44 min
Issued by
NWS Cheyenne, WY

The radar

The Riverton/Lander radar (KRIW), 209 km from the middle of the area, began a volume at 20:05 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

Riverton, WY (KRIW), launched 12:00Z, 8.0 hours before the alert went out and 203 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2019-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2019-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
22 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
98 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 Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Jul 1, 11:50 AM MDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 1, 11:50 AM MDT, 2 hours 11 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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Hazardous weather outlook, Jul 1, 10:27 AM MDT, 3 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
1027 AM MDT Mon Jul 1 2019

NEZ002-003-019>021-054-055-095-096-WYZ101>119-021000-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
1027 AM MDT Mon Jul 1 2019

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Isolated to scattered afternoon and evening thunderstorms are
expected. A few of the storms may become strong to marginally severe
over southeast Wyoming along and east of Interstate 25, and over the
southern Nebraska Panhandle. Strong wind gusts appear to be the main
threat though some hail is possible as well.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Scattered afternoon and evening thunderstorms will be possible
nearly every day through the weekend.

.Spotter information statement...

Spotter activation is not expected.

In the hours before

Special weather statement, Jul 1, 2:01 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
201 PM MDT Mon Jul 1 2019

WYZ101-012045-
Converse County Lower Elevations WY-
201 PM MDT Mon Jul 1 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CONVERSE COUNTY
UNTIL 245 PM MDT...

At 200 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Edgerton, or 28 miles southeast of Kaycee, moving
east at 20 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

This storm will remain over mainly rural areas of northwestern
Converse County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4349 10585 4338 10592 4341 10607 4349 10608
      4350 10607 4350 10585
TIME...MOT...LOC 2000Z 287DEG 17KT 4350 10615

Cox

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 6:22 PM MDTSevere Thunderstorm WarningCYSPlatte38 min
Jun 30, 6:23 PM MDTSpecial Weather StatementCYSNiobrara52 min
Jun 30, 6:33 PM MDTSpecial Weather StatementCYSGoshen42 min
Jun 30, 6:35 PM MDTSpecial Weather StatementCYSPlatte40 min
Jun 30, 6:36 PM MDTSpecial Weather StatementCYSLaramie39 min
Jun 30, 6:43 PM MDTSevere Thunderstorm WarningCYSGoshen32 min
Jun 30, 6:48 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie, Platte42 min
Jun 30, 6:53 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte52 min
Jun 30, 7:10 PM MDTSevere Thunderstorm WarningCYSGoshen35 min
Jun 30, 7:13 PM MDTSpecial Weather StatementCYSLaramie47 min
Jun 30, 7:22 PM MDTSpecial Weather StatementCYSGoshen38 min
Jun 30, 7:26 PM MDTSevere Thunderstorm WarningCYSConverse, Goshen, Niobrara, Platte34 min
Jun 30, 7:46 PM MDTSevere Thunderstorm WarningCYSGoshen29 min
Jun 30, 8:07 PM MDTSpecial Weather StatementCYSNiobrara53 min
Jul 1, 2:32 PM MDTSpecial Weather StatementCYSLaramie43 min
Jul 1, 2:37 PM MDTSpecial Weather StatementCYSConverse53 min
Jul 1, 2:52 PM MDTSevere Thunderstorm WarningCYSConverse38 min
Jul 1, 3:13 PM MDTSpecial Weather StatementCYSLaramie32 min
Jul 1, 3:18 PM MDTSevere Thunderstorm WarningCYSConverse42 min
Jul 1, 3:22 PM MDTSpecial Weather StatementCYSAlbany38 min
Jul 1, 3:40 PM MDTSevere Thunderstorm WarningCYSConverse50 min
Jul 1, 3:44 PM MDTSpecial Weather StatementCYSLaramie31 min
Jul 1, 3:49 PM MDTSpecial Weather StatementCYSLaramie26 min
Jul 1, 4:09 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara36 min
Jul 1, 4:13 PM MDTSpecial Weather StatementCYSLaramie47 min
Jul 1, 4:14 PM MDTSpecial Weather StatementCYSLaramie46 min
Jul 1, 4:30 PM MDTSpecial Weather StatementCYSPlatte45 min
Jul 1, 4:44 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara46 min
Jul 1, 5:12 PM MDTSpecial Weather StatementCYSPlatte33 min
Jul 1, 5:15 PM MDTSevere Thunderstorm WarningCYSGoshen, Niobrara, Platte45 min
Jul 1, 5:35 PM MDTSpecial Weather StatementCYSLaramie40 min
Jul 1, 5:40 PM MDTSevere Thunderstorm WarningCYSLaramie35 min
Jul 1, 5:44 PM MDTSpecial Weather StatementCYSPlatte46 min
Jul 1, 5:53 PM MDTSevere Thunderstorm WarningCYSGoshen, Niobrara37 min
Jun 30, 8:09 PM MDTSpecial Weather StatementCYSBanner51 min
Jun 30, 8:14 PM MDTSpecial Weather StatementCYSScotts Bluff46 min
Jun 30, 8:23 PM MDTSpecial Weather StatementCYSCheyenne52 min
Jun 30, 8:27 PM MDTSpecial Weather StatementCYSKimball48 min
Jun 30, 9:13 PM MDTSpecial Weather StatementCYSBanner, Cheyenne, Kimball47 min
Jun 30, 9:39 PM MDTSevere Thunderstorm WarningCYSBanner, Cheyenne, Kimball, Morrill36 min
Jun 30, 10:06 PM MDTSevere Thunderstorm WarningCYSBanner, Box Butte, Morrill, Scotts Bluff, Sioux54 min
Jun 30, 11:00 PM MDTSpecial Weather StatementCYSBox Butte45 min

Nearby

Special Weather Statements in Wyoming, 2019Every special weather statement in 2019

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.