Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Cheyenne, WY

July 17, 2016Laramie County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jul 17, 2016, 10:22 PM MDT for Laramie County, Wyoming. It was in force for 38 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 17, 2016, 10:22 PM MDT (04:22 UTC)
Expired
Jul 17, 2016, 11:00 PM MDT
In force
38 min
Issued by
NWS Cheyenne, WY

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 37 km from the middle of the area, began a volume at 04:25 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

Denver, CO (KDEN), launched 00:00Z, 4.4 hours before the alert went out and 167 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, Denver, CO at 00:00Z on 2016-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 697 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, Denver, CO at 00:00Z on 2016-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
697 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
2716 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

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 17, 10:17 PM MDT, 5 minutes earlier.

Area forecast discussion, Jul 17, 10:17 PM MDT, 5 minutes before
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Hazardous weather outlook, Jul 17, 9:21 PM MDT, 1 hour 1 minute before
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In the hours before

Special weather statement, Jul 17, 5:23 PM MDT, 4 hours 59 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
523 PM MDT SUN JUL 17 2016

WYZ101-102-180015-
NIOBRARA COUNTY WY-CONVERSE COUNTY LOWER ELEVATIONS WY-
523 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CONVERSE AND
NORTHWESTERN NIOBRARA COUNTIES UNTIL 615 PM MDT...

AT 523 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12
MILES WEST OF DULL CENTER...OR 27 MILES SOUTHEAST OF WRIGHT...MOVING
EAST AT 25 MPH.

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

THIS STRONG THUNDERSTORM WILL BE NEAR...
  DULL CENTER AROUND 555 PM MDT.

LAT...LON 4326 10485 4330 10531 4348 10536 4350 10519
      4350 10486
TIME...MOT...LOC 2323Z 261DEG 22KT 4340 10521

RUBIN
Special weather statement, Jul 17, 5:40 PM MDT, 4 hours 42 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
540 PM MDT SUN JUL 17 2016

WYZ101-180030-
CONVERSE COUNTY LOWER ELEVATIONS WY-
540 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CONVERSE COUNTY
UNTIL 630 PM MDT...

AT 540 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12
MILES WEST OF BILL...OR 33 MILES NORTH OF DOUGLAS...MOVING EAST AT 30
MPH.

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

THIS STRONG THUNDERSTORM WILL BE NEAR...
  BILL AROUND 605 PM MDT.

LAT...LON 4319 10559 4328 10562 4338 10508 4314 10502
TIME...MOT...LOC 2340Z 261DEG 28KT 4323 10551

RUBIN
Special weather statement, Jul 17, 6:18 PM MDT, 4 hours 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
618 PM MDT SUN JUL 17 2016

WYZ101-102-180115-
NIOBRARA COUNTY WY-CONVERSE COUNTY LOWER ELEVATIONS WY-
618 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CONVERSE AND
NORTHWESTERN NIOBRARA COUNTIES UNTIL 715 PM MDT...

AT 618 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER DULL CENTER...OR 37 MILES SOUTHEAST OF WRIGHT...MOVING EAST AT
30 MPH.

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

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF NORTHEASTERN
CONVERSE AND NORTHWESTERN NIOBRARA COUNTIES.

LAT...LON 4323 10429 4327 10511 4349 10512 4350 10490
      4350 10431
TIME...MOT...LOC 0018Z 268DEG 28KT 4339 10493

RUBIN
Special weather statement, Jul 17, 7:44 PM MDT, 2 hours 38 minutes before
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Local storm report, Jul 17, 8:04 PM MDT, 2 hours 18 minutes before
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Special weather statement, Jul 17, 10:22 PM MDT, 0 minutes before
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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 18, 1:29 PM MDTSpecial Weather StatementCYSGoshen46 min
Jul 18, 2:49 PM MDTSpecial Weather StatementCYSGoshen41 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.