Alert archive / Wyoming / Special Weather Statements in 2014

Special Weather Statement, NWS Cheyenne, WY

June 22, 2014Converse County, Wyoming

NWS Cheyenne, WY issued this special weather statement at Jun 22, 2014, 5:49 PM MDT for Converse County, Wyoming. It was in force for 26 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: Jun 22, 2014, 5:49 PM MDT (23:49 UTC)
Expired: Jun 22, 2014, 6:15 PM MDT
In force: 26 min
Issued by: NWS Cheyenne, WY

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 177 km from the middle of the area, began a volume at 23:50 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

Riverton, WY (KRIW), launched 12:00Z, 11.8 hours before the alert went out and 252 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: 30 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1160 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 73 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 Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Jun 22, 3:22 PM MDT, 2 hours 27 minutes earlier.

Area forecast discussion, Jun 22, 3:22 PM MDT, 2 hours 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
322 PM MDT SUN JUN 22 2014

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 300 PM MDT SUN JUN 22 2014

AN ACTIVE PERIOD AHEAD AS THE PATTERN OVER THE CWFA CHANGES VERY
LITTLE THRU TUESDAY. A SERIES OF SHORTWAVES EMBEDDED WITHIN
WEST/NORTHWEST FLOW WILL INTERACT WITH MOIST NORTHEASTERLY UPSLOPE
FLOW AT THE SFC TO PRODUCE PERIODIC THUNDERSTORM CHANCES. TWO
DISTINCT SHORTWAVES EVIDENT ON SATELLITE PIX EARLY THIS AFTERNOON.
THE FIRST IS AN MCV SPINNING INTO WRN SOUTH DAKOTA. MUCH OF THE
IMPACT FROM THIS FTR HAS SHIFTED EAST OF THE AREA. THE SECOND
SHORTWAVE IS SEEN MOVING VERY CLOSE TO THE WY/CO STATELINE.
CONVECTION HAS ALREADY GOT ITS START IN THIS AREA EARLY THIS
AFTERNOON. THE AIR MASS THAT THIS CONVECTION WILL BE MOVING INTO
WILL OFFER SFC DEW POINTS IN THE 50S AND A PERSISTENT NORTHEASTERLY
LLVL UPSLOPE FLOW. DEEP LAYER SHEAR OF 30-40 KNOTS WILL BE COMMON
ACROSS THE AREA THIS AFTERNOON...ALONG WITH PROGD SBCAPES OF
1000-1500 J/KG. BEST POTENTIAL FOR STRONG/SEVERE ACTIVITY WILL BE
FROM KCYS TO KSNY WHERE BEST INSTABILITY AXIS IS JUXTAPOSED WITH THE
SHORTWAVE AND LLVL UPSLOPE. MAY SEE SOME DISCRETE ACTIVITY
INITIALLY...BUT WOULD EXPECT CONVECTION TO MERGE INTO A MULTI-CELL
CLUSTER BY LATE AFTERNOON AS IT PUSHES EAST TOWARDS THE SRN NEBRASKA
PANHANDLE.

FOR TONIGHT...A THIRD SHORTWAVE EVIDENT SPINNING ACROSS IDAHO WILL
TRANSLATE ACROSS WYOMING AND LIKELY SUSTAIN CONVECTION ESPECIALLY
OVER EAST CENTRAL WYOMING AND THE NORTHERN NEBRASKA PANHANDLE
THROUGH SUNRISE TUESDAY. TONIGHTS ACTIVITY WILL BE MORE GARDEN
VARIETY WITH NO SEVERE WEATHER CONCERNS. THE OTHER CONCERN TONIGHT
WILL BE FOR FOG DEVELOPMENT ALONG THE CHEYENNE RIDGE AND INTO THE
SRN LARAMIE RANGE. MOIST LLVL NORTHEASTERLY UPSLOPE WILL BE A
FAVORABLE PATTERN FOR THIS DEVELOPMENT...WHICH WILL MAINLY IMPACT
LARAMIE COUNTY.

A REPEAT AHEAD FOR MONDAY...WITH ANOTHER DAY OF EMBEDDED SHORTWAVES
TRANSLATING THRU THE FLOW OVERRIDING THE MOIST LLVL NORTHEASTERLY
UPSLOPE FLOW. ALTHOUGH INSTABILITY WILL BE A BIT LIGHTER COMPARED TO
TODAYS WITH PROGD SBCAPES OF GENERALLY 500-1000 J/KG DURING THE
AFTERNOON HOURS. 40-50 KNOTS OF 0-6 KM SHEAR MAY BE ENOUGH TO GET A
FEW STRONGER THUNDERSTORMS ESPECIALLY WHERE INSTABILITY WILL BE
GREATEST...WHICH WILL BE NR THE COLORADO STATELINE. ANOTHER
SHORTWAVE WILL PUSH THRU MONDAY NIGHT...LIKELY SUSTAINING
THUNDERSTORM ACTIVITY INTO THE OVERNIGHT HOURS. THE POTENTIAL FOR
FOG CAN AGAIN BE EXPECTED MAINLY ACROSS LARAMIE COUNTY MONDAY NIGHT.

TEMPERATURES WILL BE WARMER FOR TUESDAY AND WITH THE PATTERN NEARLY
UNCHANGED FROM THE PREVIOUS TWO DAYS...EXPECT ANOTHER ROUND OF
AFTERNOON AND EVENING THUNDERSTORMS TO DEVELOP. INSTABILITY
PARAMETERS WILL BE A BIT BETTER WITH DEEP LAYER SHEAR THAT WILL
CONTINUE TO BE IN THE VICINITY OF 40 KNOTS. TUESDAY WILL LIKELY BE
THE BEST DAY FOR SEVERE POTENTIAL OF THE SHORT-TERM. THE AREA OF
GREATEST CONCERNS WILL BE MAINLY FROM CHEYENNE TO SIDNEY.

WITH THE 0.75" PWAT LINE BACKING UP TO THE LARAMIE RANGE...ANY
THUNDERSTORM WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN. STORM
MOTIONS ARE THE SLOWEST TODAY AT SPEEDS OF 5 TO 10 MPH. FORTUNATELY
THESE WILL SPEED UP FOR MON/TUE. EVEN SO...WONT BE ABLE TO RULE OUT
HEAVY RAIN IN THE EVENT STORMS CAN BEGIN TO TRAIN.

.LONG TERM...(TUESDAY NIGHT THROUGH SATURDAY)
ISSUED AT 300 PM MDT SUN JUN 22 2014

LOOKS LIKE THE EXTENDED PERIOD COULD BE QUITE ACTIVE WITH REGARD
TO SEVERE STORMS. FLOW ALOFT IS GENERALLY ZONAL TO SOUTHWESTERLY
FROM WED INTO FRI. AT THE SFC...ALL MODELS SHOW EXCELLENT LLVL
MOISTURE IN SE WINDS TO THE EAST OF THE LARAMIE RANGE ON WED.
INSTABILITY IS REALLY HIGH WITH LI VALUES OF -7C TO -9C AND WHEN
COMBINED WITH BULK SHEAR OF 40-50 KTS...WED APPEARS TO HAVE A
REALLY GOOD POTENTIAL FOR WIDESPREAD SVR STORMS OVER THE PLAINS.
RIDGE ALOFT PUSHES ACROSS THE CWA ON THURS WITH THE MOISTURE
BOUNDARY SHIFTING EAST EVER SO SLIGHTLY TO ALONG THE WY-NE BORDER.
ALTHOUGH THERE IS MIDLEVEL WARMING ON THURS AND WINDS ALOFT
WEAKEN...STILL BELIEVE THERE WILL BE SOME STRONG TO SVR STORM
POTENTIAL IN THE PANHANDLE. FLOW ALOFT IS MORE SOUTHWESTERLY ON
FRI AND ONCE AGAIN THE DRYLINE SETS UP ALONG THE WY-NE BORDER. THE
GFS SHOWS CAPE VALUES OF 3000-4000 J/KG IN THE PANHANDLE WITH
40-45 KTS OF DEEP LAYER SHEAR. WITH THESE CONVECTIVE
PARAMETERS...YET ANOTHER AFTN AND EVENING OF SVR STORMS WOULD BE
POSSIBLE. THE LONG RANGE MODELS HINT THAT THE SFC TROUGH WILL
SHIFT EASTWARD INTO CENTRAL NEBRASKA BY SAT...AND WITH DRIER
WESTERLY BOUNDARY LAYER FLOW...TSTM CHANCES WOULD DROP OFF. TEMPS
THROUGH THE WEEK WILL BE NEAR TO SLIGHTLY ABOVE NORMAL.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY MORNING)
ISSUED AT 1147 AM MDT SUN JUN 22 2014

SHOWERS AND TSTMS WILL DEVELOP BY LATE THIS AFTERNOON OVER MUCH OF
THE PLAINS AND WILL BE MOST NUMEROUS IN AREAS NEAR INTERSTATE 80.
INCLUDED MVFR VIS AT CYS AND SNY SINCE BRIEF HEAVY RAIN WILL BE
POSSIBLE WITH SOME OF THE STORMS. SHOWERS WILL BEGIN TO TAPER OFF
BY SUNSET. LOW CLOUDS COULD DEVELOP ALONG THE CHEYENNE RIDGE BY
LATE TONIGHT...HOWEVER CONFIDENCE WAS NOT HIGH ENOUGH TO INCLUDE
IFR CIGS AT CYS WITH THIS TAF ISSUANCE.

&&

.FIRE WEATHER...
ISSUED AT 300 PM MDT SUN JUN 22 2014

AN ACTIVE PERIOD SHAPING UP WITH DAILY CHANCES FOR PRIMARILY
AFTERNOON AND EVENING SHOWER AND THUNDERSTORM DEVELOPMENT. BEST
CHANCES WILL BE CONFINED TO AREAS IN AND AROUND THE LARAMIE RANGE
AND NEAR THE COLORADO STATELINE FOR BOTH TODAY AND TOMORROW. SHOWER
AND THUNDERSTORM ACTIVITY MAY LINGER INTO THE OVERNIGHT HOURS AS
WELL...ESPECIALLY ACROSS EAST CENTRAL WYOMING AND THE NORTHERN
NEBRASKA PANHANDLE. A FEW THUNDERSTORMS MAY BECOME STRONG TO LOCALLY
SEVERE...ESPECIALLY FROM CHEYENNE TO SIDNEY. SHOWER AND THUNDERSTORM
COVERAGE WILL BE MUCH LESS ACROSS CARBON COUNTY...WHERE A DRIER AIR
MASS WILL BE IN PLACE. HUMIDITY RECOVERIES WILL BE EXCELLENT EAST OF
THE LARAMIE RANGE OVER THE NEXT FEW DAYS AS THE GULF MOISTURE STREAM
WILL REMAIN.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.
&&

SHORT TERM...HAHN
LONG TERM...FINCH
AVIATION...FINCH
FIRE WEATHER...FINCH

Hazardous weather outlook, Jun 22, 10:54 AM MDT, 6 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1054 AM MDT SUN JUN 22 2014

WYZ101>119-231115-
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-
1054 AM MDT SUN JUN 22 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL BECOME MORE NUMEROUS TODAY AS A FRONT
PUSHES SOUTH INTO COLORADO. A FEW OF THESE THUNDERSTORMS MAY BECOME
SEVERE CONTAINING LARGE HAIL AND DAMAGING WINDS...MAINLY ACROSS
LARAMIE COUNTY. THIS ACTIVITY WILL LIKELY LINGER INTO TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS WILL CONTINUE EACH DAY THROUGH THE END OF THE WEEK.
THE PROBABILITY OF SEVERE THUNDERSTORMS APPEARS TO BE SMALL AT
THIS TIME AND MAINLY ON MONDAY AND TUESDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

NEZ002-003-019>021-054-055-095-096-231115-
DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE-
NORTH SIOUX-SOUTH SIOUX-
1054 AM MDT SUN JUN 22 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA
PANHANDLE.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL BECOME MORE NUMEROUS TODAY AS A FRONT
PUSHES SOUTH INTO COLORADO. A FEW OF THESE THUNDERSTORMS MAY BECOME
SEVERE CONTAINING LARGE HAIL AND DAMAGING WINDS...MAINLY OVR THE
SOUTHERN NEBRASKA PANHANDLE. THIS ACTIVITY WILL LIKELY LINGER INTO
TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS WILL CONTINUE EACH DAY THROUGH THE END OF THE WEEK.
THERE IS POTENTIAL FOR ISOLATED SEVERE THUNDERSTORMS MONDAY
EVENING AND AGAIN TUESDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND
CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT...
HTTP://WEATHER.GOV/CHEYENNE

In the hours before

Local storm report, Jun 22, 5:22 PM MDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
522 PM MDT SUN JUN 22 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0520 PM     HAIL             ROLLING HILLS ESTATES   42.90N 105.85W
06/22/2014  E0.25 INCH       CONVERSE           WY   TRAINED SPOTTER

            HEAVY RAIN.30-40 MPH WINDS.

&&

BCHAPMAN

Local storm report, Jun 22, 5:25 PM MDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
525 PM MDT SUN JUN 22 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0523 PM     HAIL             27 S DOUGLAS            42.37N 105.39W
06/22/2014  E0.25 INCH       CONVERSE           WY   TRAINED SPOTTER

            HEAVY RAIN

&&

BCHAPMAN

Local storm report, Jun 22, 5:27 PM MDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
527 PM MDT SUN JUN 22 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0523 PM     TSTM WND DMG     ROLLING HILLS ESTATES   42.90N 105.85W
06/22/2014                   CONVERSE           WY   TRAINED SPOTTER

            6 INCH BRANCH BROKE OFF A COTTONWOOD TREE. WINDS
            ESTIMATED AT 50 MPH.

&&

BCHAPMAN

Local storm report, Jun 22, 5:33 PM MDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
533 PM MDT SUN JUN 22 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0531 PM     TSTM WND GST     14 SW DOUGLAS           42.61N 105.59W
06/22/2014  E50 MPH          CONVERSE           WY   TRAINED SPOTTER

            WINDS ESTIMATED AT 40 TO 50 MPH.

&&

BCHAPMAN

Local storm report, Jun 22, 5:49 PM MDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
549 PM MDT SUN JUN 22 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0546 PM     HAIL             DOUGLAS                 42.76N 105.39W
06/22/2014  E0.25 INCH       CONVERSE           WY   TRAINED SPOTTER

            HEAVY RAIN AND SOME WIND OF 20 TO 25 MPH.

&&

BCHAPMAN

Special weather statement, Jun 22, 5:49 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
549 PM MDT SUN JUN 22 2014

WYZ101>103-105>107-230015-
CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-CONVERSE COUNTY
LOWER ELEVATIONS WY-EAST PLATTE COUNTY WY-NIOBRARA COUNTY WY-NORTH
LARAMIE RANGE WY-SHIRLEY BASIN WY-
549 PM MDT SUN JUN 22 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PLATTE...CONVERSE...
NORTHERN ALBANY...EASTERN CARBON AND SOUTHWESTERN NIOBRARA COUNTIES
UNTIL 615 PM MDT...

AT 544 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 14 MILES SOUTHWEST
OF BILL TO 9 MILES SOUTHEAST OF DOUGLAS TO WHEATLAND RESERVOIR 3...
AND MOVING EAST AT 30 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 55 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  LARAMIE PEAK...
  ESTERBROOK CAMPGROUND...
  HARRIS PARK...
  BILL...
  GLENDO...
  SIBLEY PEAK...
  GLENDO RESERVOIR...
  TWO MOON CAMPGROUND...
  MANNING RANCH...
  KEELINE...
  LOST SPRINGS...

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 90 AND
156.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

&&

LAT...LON 4332 10491 4268 10466 4181 10527 4187 10622
      4269 10563 4315 10587
TIME...MOT...LOC 2349Z 265DEG 28KT 4314 10546 4267 10520
          4193 10572

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 6:23 PM MDT	Special Weather Statement	CYS	Niobrara	67 min
Jun 22, 3:13 PM MDT	Special Weather Statement	CYS	Albany	32 min
Jun 22, 4:32 PM MDT	Special Weather Statement	CYS	Albany	28 min
Jun 22, 4:35 PM MDT	Special Weather Statement	CYS	Platte	25 min
Jun 22, 4:52 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	53 min
Jun 22, 5:17 PM MDT	Special Weather Statement	CYS	Converse	28 min
Jun 22, 5:19 PM MDT	Special Weather Statement	CYS	Converse	26 min

Nearby

Special Weather Statements in Wyoming, 2014 Every special weather statement in 2014

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.