Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Cheyenne, WY

July 18, 2016Goshen County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 18, 2016, 2:49 PM MDT for Goshen County, Wyoming. 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 18, 2016, 2:49 PM MDT (20:49 UTC)
Expired
Jul 18, 2016, 3:30 PM MDT
In force
41 min
Issued by
NWS Cheyenne, WY

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 128 km from the middle of the area, began a volume at 20:50 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

Rapid City, SD (KRAP), launched 12:00Z, 8.8 hours before the alert went out and 234 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, Rapid City, SD at 12:00Z on 2016-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 330 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2016-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
330 J/kg
Mixed-layer CIN
-353 J/kg
Mixed-layer LCL
2100 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

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 18, 11:19 AM MDT, 3 hours 30 minutes earlier.

Area forecast discussion, Jul 18, 11:19 AM MDT, 3 hours 30 minutes before
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</head>
<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Jul 18, 4:19 AM MDT, 10 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
419 AM MDT MON JUL 18 2016

NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-117>119-
191030-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS-
NIOBRARA COUNTY-NORTH LARAMIE RANGE-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY-
EAST PLATTE COUNTY-GOSHEN COUNTY-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY-
419 AM MDT MON JUL 18 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PANHANDLE
NEBRASKA...EAST CENTRAL WYOMING AND SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED AFTERNOON THUNDERSTORMS ARE EXPECTED TO DEVELOP ONCE
AGAIN MAINLY ALONG AND EAST OF A LUSK TO LARAMIE LINE. SOME OF
THESE STORMS ARE EXPECTED COULD BECOME SEVERE WITH DAMAGING WINDS
AND LARGE HAIL. HOWEVER, THE BIGGER THREAT THIS AFTERNOON AND
EVENING COULD BE THE POTENTIAL FOR TORRENTIAL RAINFALL ESPECIALLY
IN THE SOUTHERN PANHANDLE WHERE THEY MAY RECEIVE SOME ISOLATED
FLASH FLOODING. THE STORMS WILL GENERALLY MOVE NORTHEAST AT 10 TO
20 MPH, BUT SOME OF THESE STORMS IN THE SOUTHERN PANHANDLE MAY
HAVE SLOWER MOVEMENT WITH A FEW OF THE STORMS TRAINING OVER THE
SAME LOCATION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

MORE AFTERNOON THUNDERSTORMS ARE POSSIBLE THROUGH THURSDAY WITH
THE BEST CHANCE ALONG THE I-80 CORRIDOR. SOME OF THESE STORMS MAY
BECOME STRONG, BUT THE SEVERE CHANCES LOOK TO BE RATHER LIMITED AT
THIS TIME. THE NEXT BEST CHANCE OF THUNDERSTORMS IS EXPECTED TO
OCCUR LATE THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...
STORM SPOTTER ACTIVATION MAY BE POSSIBLE THIS AFTERNOON MAINLY
ALONG AND EAST OF A LARAMIE TO LUSK LINE.

WYZ104-105-109>116-191030-
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN-
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-
419 AM MDT MON JUL 18 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
WYOMING AND SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT
A FEW THUNDERSTORMS MAY DEVELOP MAINLY ALONG THE SNOWY AND SIERRA
MADRE MOUNTAIN RANGES THIS AFTERNOON. A FEW OF THESE STORMS MAY
BECOME STRONG WITH SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
THE CHANCE OF THUNDERSTORMS WILL CONTINUE THROUGH THE REMAINDER OF
THE WEEK. SOME OF THESE STORMS MAY CONTAIN SMALL HAIL AND GUSTY
WINDS.
.SPOTTER INFORMATION STATEMENT...
SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED THIS WEEK.

In the hours before

Special weather statement, Jul 18, 1:29 PM MDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
129 PM MDT MON JUL 18 2016

WYZ106>108-182015-
GOSHEN COUNTY WY-EAST PLATTE COUNTY WY-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-
129 PM MDT MON JUL 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GOSHEN AND
SOUTHEASTERN PLATTE COUNTIES UNTIL 215 PM MDT...

AT 129 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
SLATER...OR 17 MILES SOUTHEAST OF WHEATLAND...MOVING NORTHEAST AT 20
MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
LINGLE...CHUGWATER...YODER...VETERAN AND SLATER.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 53 AND
69.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4173 10484 4191 10495 4220 10426 4183 10424
TIME...MOT...LOC 1929Z 244DEG 19KT 4186 10475

HAHN
Special weather statement, Jul 18, 2:49 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
249 PM MDT MON JUL 18 2016

NEZ096-WYZ108-182130-
SOUTH SIOUX NE-GOSHEN COUNTY WY-
249 PM MDT MON JUL 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SIOUX AND EAST
CENTRAL GOSHEN COUNTIES UNTIL 330 PM MDT...

AT 249 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
TORRINGTON...MOVING NORTHEAST AT 30 MPH.

HALF INCH HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHWESTERN SIOUX
AND EAST CENTRAL GOSHEN COUNTIES.

LAT...LON 4211 10377 4199 10427 4211 10436 4242 10403
TIME...MOT...LOC 2049Z 234DEG 26KT 4209 10424

RUBIN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 6:18 PM MDTSpecial Weather StatementCYSNiobrara57 min
Jul 17, 6:25 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara65 min
Jul 17, 7:44 PM MDTSpecial Weather StatementCYSNiobrara46 min
Jul 17, 10:22 PM MDTSpecial Weather StatementCYSLaramie38 min
Jul 18, 1:29 PM MDTSpecial Weather StatementCYSGoshen46 min
Jul 18, 3:07 PM MDTSpecial Weather StatementCYSNiobrara38 min
Jul 18, 3:43 PM MDTSpecial Weather StatementCYSNiobrara32 min
Jul 18, 3:53 PM MDTSpecial Weather StatementCYSNiobrara67 min
Jul 18, 3:58 PM MDTSevere Thunderstorm WarningCYSNiobrara43 min
Jul 18, 5:48 PM MDTAreal Flood AdvisoryCYSLaramie3 hr
Jul 17, 10:26 PM MDTSpecial Weather StatementCYSScotts Bluff34 min
Jul 17, 11:04 PM MDTSpecial Weather StatementCYSKimball26 min
Jul 18, 3:27 PM MDTSpecial Weather StatementCYSScotts Bluff33 min
Jul 18, 4:01 PM MDTSpecial Weather StatementCYSScotts Bluff29 min
Jul 18, 4:18 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill, Scotts Bluff, Sioux57 min
Jul 18, 4:56 PM MDTSpecial Weather StatementCYSKimball49 min
Jul 18, 5:42 PM MDTSpecial Weather StatementCYSBanner33 min
Jul 18, 5:44 PM MDTSpecial Weather StatementCYSKimball46 min

Nearby

Special Weather Statements in Wyoming, 2016Every 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.