Alert archive / Wyoming / Special Weather Statements in 2016

Special Weather Statement, NWS Riverton, WY

July 17, 2016Johnson County, Wyoming

NWS Riverton, WY issued this special weather statement at Jul 17, 2016, 8:13 PM MDT for Johnson County, Wyoming. It was in force for 47 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, 8:13 PM MDT (02:13 UTC)
Expired: Jul 17, 2016, 9:00 PM MDT
In force: 47 min
Issued by: NWS Riverton, WY

County Johnson County, WY

The radar

The Riverton/Lander radar (KRIW), 247 km from the middle of the area, began a volume at 02:13 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 00:00Z, 2.2 hours before the alert went out and 241 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: 631 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 2893 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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 Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jul 17, 2:05 PM MDT, 6 hours 8 minutes earlier.

Area forecast discussion, Jul 17, 2:05 PM MDT, 6 hours 8 minutes before

Area Forecast Discussion
National Weather Service Riverton WY
205 PM MDT SUN JUL 17 2016

.SHORT TERM...Tonight Through Monday

Rather dry west southwest flow aloft will be over the area through
Monday with very warm to hot temperatures. Isolated afternoon and
evening showers and thunderstorms will be possible mainly over
the mountains this evening and again on Monday. Gusty southwest
winds will increase over and near the east slopes of the mountains
Monday afternoon.

.LONG TERM...Monday night Through Sunday

Rather dry west southwest flow aloft will be over the area through
the weekend with very warm to hot temperatures and low relative
humidity. Isolated afternoon and evening showers and thunderstorms
will be possible mainly over the mountains monday evening and
again on Tuesday. Then the convection is expected to be limited
to the extreme south over sweetwater county.  Gusty southwest
winds will increase over and near the east slopes of the mountains.

&&

.AVIATION.../00Z ISSUANCE/

Showers and thunderstorms will be found across much of central and
western Wyoming through around 04z this evening. Gusty wind and small
hail will be possible, with associated periods of MVFR conditions and
mountain obscurations. By 06z, mainly mountain shower activity is
expected. This activity will linger through 12z Monday, with widespread
VFR conditions then expected. Wind will start to increase after 16z
with periods of gusty wind expected by 20z for many terminals. Any
shower development is expected to be over the northern mountains after
20z and could result in local mountain obscurations. Minimal impacts
from these storms are anticipated at area terminals, though nearby
storms may result in periods of breezy and erratic wind at KCOD.

&&

.FIRE WEATHER...

Rather dry west southwest flow aloft will be over the area through
the week with very warm to hot temperatures and low relative
humidity. Isolated afternoon and evening showers and
thunderstorms will be possible mainly over the higher mountains
this evening and again on Monday. Gusty southwest winds will
increase over and near the east slopes of the mountains Monday
afternoon combining with relative humidity of 10 to 15 percent in
the lower elevations.

&&

.RIW Watches/Warnings/Advisories...
Fire Weather Watch from Monday afternoon through Monday evening
for WYZ280-300.

&&

SHORT TERM...C.Baker
LONG TERM...C.Baker
AVIATION...Branham
FIRE WEATHER...C.Baker

Hazardous weather outlook, Jul 17, 3:30 AM MDT, 16 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
330 AM MDT SUN JUL 17 2016

WYZ001>020-022>030-181200-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS-
NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE-
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY-
SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS-
UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY-
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY-
330 AM MDT SUN JUL 17 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ELEVATED FIRE DANGER ACROSS MUCH OF THE LOWER ELEVATIONS EAST OF
THE DIVIDE. ISOLATED TO WIDELY SCATTERED THUNDERSTORMS OVER THE
REGION. SOME STORMS WILL HAVE SMALL HAIL AND GUSTY OUTFLOW WINDS
TO 45 MPH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

MONDAY...ISOLATED THUNDERSTORMS POSSIBLE ACROSS MAINLY THE
ABSAROKA AND BIGHORN MOUNTAINS.

TUESDAY...ISOLATED TO WIDELY SCATTERED AFTERNOON AND EVENING
THUNDERSTORMS IN THE SOUTH AND CASPER MOUNTAIN AREA. GUSTY WIND
AND LIGHTNING WILL BE THE MAIN THREATS.

WEDNESDAY...ISOLATED AFTERNOON AND EVENING THUNDERSTORMS IN THE
SOUTH. GUSTY WIND AND LIGHTNING ARE THE MAIN THREATS.

THURSDAY THROUGH SATURDAY...ISOLATED AFTERNOON AND EVENING
THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE URGED TO REPORT STRONG WIND GUSTS OVER 40 MPH.
THANK YOU.

In the hours before

Special weather statement, Jul 17, 6:33 PM MDT, 1 hour 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
633 PM MDT SUN JUL 17 2016

WYZ002>004-180115-
ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN-
633 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PARK COUNTY UNTIL
715 PM MDT...

AT 629 PM MDT...DOPPLER RADAR WAS TRACKING AN AREA OF SHOWERS AND
ISOLATED THUNDERSTORMS WEST OF CODY OVER THE ABSAROKA MOUNTAINS...
MOVING NORTHEAST AT 35 MPH.

WIND GUSTS OF 40 TO 50 MPH WILL BE POSSIBLE WITH THESE SHOWERS AND
STORMS.

THESE SHOWERS AND STORMS WILL BE NEAR...
  BUFFALO BILL STATE PARK AROUND 645 PM MDT.
  CODY AROUND 700 PM MDT.
  POWELL AROUND 715 PM MDT.

LAT...LON 4459 10859 4427 10927 4462 10990 4467 10987
      4470 10983 4473 10984 4489 10976 4498 10885
TIME...MOT...LOC 0029Z 233DEG 30KT 4448 10939

JONES

Special weather statement, Jul 17, 6:47 PM MDT, 1 hour 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
647 PM MDT SUN JUL 17 2016

WYZ002-015>017-180145-
ABSAROKA MOUNTAINS-WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-UPPER
WIND RIVER BASIN-
647 PM MDT SUN JUL 17 2016

...STRONG WIND GUSTS FROM SHOWERS AND STORMS WILL AFFECT
NORTHWESTERN FREMONT COUNTY...

AT 644 PM MDT...STRONG WIND GUSTS TO 55 MPH WERE LOCATED NEAR
DUBOIS...MOVING EAST NORTHEAST THROUGH THE WEST END OF FREMONT
COUNTY.

WIND GUSTS OF 45 TO 55 MPH...WITH LOCALIZED HIGHER GUSTS...ARE
POSSIBLE WITH THIS SHOWER.

LOCATIONS IMPACTED INCLUDE...
CROWHEART...BURRIS...MAVERIK SPRING DOME FIELD...
AND LONGHORN RANCH LODGE AND RV RESORT.

LAT...LON 4319 10920 4351 10960 4364 10934 4349 10869
TIME...MOT...LOC 0044Z 240DEG 49KT 4359 10940

BRAUN

Special weather statement, Jul 17, 6:53 PM MDT, 1 hour 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
653 PM MDT SUN JUL 17 2016

WYZ009>011-180145-
BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY-SOUTHEAST
JOHNSON COUNTY-
653 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JOHNSON COUNTY UNTIL
745 PM MDT...

AT 652 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 9 MILES SOUTHEAST OF CLOUD
PEAK TO 14 MILES NORTHEAST OF DULLKNIFE RESERVOIR TO MAYOWORTH...AND
MOVING EAST AT 55 MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  LAKE DE SMET AROUND 705 PM MDT.
  BUFFALO AROUND 710 PM MDT.
  FORT RENO HISTORICAL SITE AROUND 720 PM MDT.
  POWDER RIVER REST AREA AROUND 725 PM MDT.

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE BUFFALO GOLF
COURSE...TA GUEST RANCH AND JOHNSON COUNTY FAIRGROUNDS.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 25 BETWEEN MILE MARKERS 257 AND 299.
 INTERSTATE 90 BETWEEN MILE MARKERS 48 AND 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4376 10602 4374 10677 4410 10680 4437 10706
      4456 10660 4456 10601 4382 10601
TIME...MOT...LOC 0052Z 256DEG 50KT 4432 10700 4410 10679 4382 10677

BRAUN

Special weather statement, Jul 17, 7:29 PM MDT, 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
729 PM MDT SUN JUL 17 2016

WYZ010-011-180215-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
729 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JOHNSON COUNTY UNTIL
815 PM MDT...

AT 727 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES EAST OF BUFFALO TO
15 MILES SOUTHWEST OF POWDER RIVER REST AREA TO NEAR FORT RENO
HISTORICAL SITE...AND MOVING NORTHEAST AT 35 MPH.

DIME TO NICKLE SIZE HAIL AND WIND GUSTS 45 TO 55 MPH...WITH
LOCALLY HIGHER GUSTS POSSIBLE...WILL BE POSSIBLE WITH THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  POWDER RIVER REST AREA AROUND 755 PM MDT.

OTHER LOCATIONS IMPACTED BY THESE STORMS INCLUDE TWIN CREEKS
CAMPGROUND...JOHNSON COUNTY FAIRGROUNDS...INDIAN CAMPGROUND AND
JOHNSON COUNTY LIBRARY.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 25 BETWEEN MILE MARKERS 275 AND 299.
 INTERSTATE 90 BETWEEN MILE MARKERS 57 AND 95.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4382 10640 4403 10669 4437 10670 4456 10627
      4456 10601 4387 10601
TIME...MOT...LOC 0127Z 230DEG 32KT 4432 10656 4411 10645 4390 10628

BRAUN

Special weather statement, Jul 17, 7:47 PM MDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
747 PM MDT SUN JUL 17 2016

WYZ003-004-008-180215-
CODY FOOTHILLS-BIGHORN MOUNTAINS WEST-NORTH BIG HORN BASIN-
747 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PARK AND
NORTHWESTERN BIG HORN COUNTIES UNTIL 815 PM MDT...

AT 747 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR CLARK TO GARLAND TO 13
MILES NORTHWEST OF GREYBULL...AND MOVING NORTH AT 50 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  BYRON AROUND 750 PM MDT.
  COWLEY AND DEAVER AROUND 800 PM MDT.
  FRANNIE AND BIGHORN LAKE AROUND 805 PM MDT.
  HORSESHOE BEND AROUND 810 PM MDT.

LAT...LON 4500 10793 4458 10815 4494 10922 4501 10921
TIME...MOT...LOC 0147Z 190DEG 45KT 4493 10913 4477 10862 4465 10822

BRAUN

Special weather statement, Jul 17, 8:13 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
813 PM MDT SUN JUL 17 2016

WYZ010-180300-
NORTHEAST JOHNSON COUNTY-
813 PM MDT SUN JUL 17 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JOHNSON COUNTY UNTIL
900 PM MDT...

AT 813 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13
MILES NORTH OF POWDER RIVER REST AREA...WHICH IS 26 MILES EAST OF
BUFFALO...MOVING NORTHEAST AT 25 MPH.

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

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF NORTHEASTERN
JOHNSON COUNTY.

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.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4452 10602 4438 10602 4428 10616 4440 10635
      4456 10619 4456 10601 4452 10601
TIME...MOT...LOC 0213Z 220DEG 23KT 4441 10619

BRAUN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 6:25 PM MDT	Special Weather Statement	RIW	Johnson	50 min
Jul 17, 6:33 PM MDT	Special Weather Statement	RIW	Park	42 min
Jul 17, 6:47 PM MDT	Special Weather Statement	RIW		58 min
Jul 17, 6:53 PM MDT	Special Weather Statement	RIW	Johnson	52 min
Jul 17, 7:29 PM MDT	Special Weather Statement	RIW	Johnson	46 min
Jul 17, 7:47 PM MDT	Special Weather Statement	RIW	Big Horn	28 min
Jul 17, 9:24 PM MDT	Red Flag Warning	RIW	Fremont, Natrona	23 hr
Jul 18, 1:59 PM MDT	Fire Weather Watch	RIW	Fremont, Hot Springs, Johnson, Lincoln, Natrona, Park and 3 more	36 hr

Nearby

Special Weather Statements in Wyoming, 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.