Alert archive / Wyoming / Flash Flood Watches in 2015

Flash Flood Watch 9, NWS Riverton, WY

June 14, 20159 counties in Wyoming

NWS Riverton, WY issued this flash flood watch at Jun 14, 2015, 3:03 PM MDT for 9 counties in Wyoming. It took effect at Jun 15, 2015, 3:00 PM MDT. It was in force for 33 hr.

The area

The counties it named.

The facts

Issued: Jun 14, 2015, 3:03 PM MDT (21:03 UTC)
In effect from: Jun 15, 2015, 3:00 PM MDT
Expired: Jun 17, 2015, 12:00 AM MDT
In force: 33 hr
Issued by: NWS Riverton, WY
Flood severity: None

Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Sublette County, WY, Sweetwater County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 47 km from the middle of the area, began a volume at 21:03 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, 9.1 hours before the alert went out and 439 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 14, 11:39 AM MDT, 3 hours 24 minutes earlier.

Area forecast discussion, Jun 14, 11:39 AM MDT, 3 hours 24 minutes before

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Hazardous weather outlook, Jun 14, 4:14 AM MDT, 10 hours 49 minutes before

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In the hours before

Special weather statement, Jun 14, 12:34 PM MDT, 2 hours 29 minutes before

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Special weather statement, Jun 14, 1:00 PM MDT, 2 hours 3 minutes before

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Local storm report, Jun 14, 1:51 PM MDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
151 PM MDT SUN JUN 14 2015

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

1200 AM     HAIL             17 ENE BUFFALO          44.44N 106.40W
06/14/2015  M1.75 INCH       JOHNSON            WY   PUBLIC

            DENTS ON VEHICLES

1005 PM     HAIL             16 ENE BUFFALO          44.43N 106.42W
06/13/2015  M1.75 INCH       JOHNSON            WY   PUBLIC

            DENTS ON VEHICLES WITH 0.25 OF ACCUMULATION ON GROUND.

&&

TL

Special weather statement, Jun 14, 1:57 PM MDT, 1 hour 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
157 PM MDT SUN JUN 14 2015

WYZ030-142045-
EAST SWEETWATER COUNTY-
157 PM MDT SUN JUN 14 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL SWEETWATER COUNTY
UNTIL 245 PM MDT...

AT 156 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 24
MILES EAST OF LOWE CANYON...WHICH IS 31 MILES SOUTH OF ROCK
SPRINGS...MOVING EAST AT 25 MPH.

PEA SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTH CENTRAL
SWEETWATER COUNTY.

#

LAT...LON 4114 10915 4126 10916 4136 10922 4142 10924
      4148 10864 4101 10845 4101 10911
TIME...MOT...LOC 1956Z 252DEG 24KT 4116 10906

13

Local storm report, Jun 14, 2:29 PM MDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE RIVERTON WY
229 PM MDT SUN JUN 14 2015

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

1205 AM     HAIL             16 ENE BUFFALO          44.43N 106.42W
06/14/2015  M1.75 INCH       JOHNSON            WY   PUBLIC

            DENTS ON VEHICLES WITH 0.25 OF ACCUMULATION ON GROUND.

&&

TL

Special weather statement, Jun 14, 2:59 PM MDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
259 PM MDT SUN JUN 14 2015

WYZ028>030-142145-
ROCK SPRINGS AND GREEN RIVER-EAST SWEETWATER COUNTY-FLAMING GORGE-
259 PM MDT SUN JUN 14 2015

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL SWEETWATER COUNTY
UNTIL 345 PM MDT...

AT 258 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
NORTHEASTERN GREEN RIVER...MOVING EAST AT 35 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  PILOT BUTTE AROUND 310 PM MDT.
  ROCK SPRINGS AROUND 320 PM MDT.
  SWEETWATER COUNTY AIRPORT AROUND 335 PM MDT.

#

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 87 AND 126.

LAT...LON 4141 10952 4168 10953 4174 10886 4141 10883
TIME...MOT...LOC 2058Z 267DEG 28KT 4153 10944

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 8:18 PM MDT	Special Weather Statement	RIW	Big Horn	57 min
Jun 13, 8:32 PM MDT	Special Weather Statement	RIW	Big Horn	43 min
Jun 13, 8:57 PM MDT	Areal Flood Advisory	RIW	Big Horn	3 hr
Jun 13, 11:01 PM MDT	Special Weather Statement	RIW	Johnson	44 min
Jun 13, 11:43 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	32 min
Jun 14, 1:57 PM MDT	Special Weather Statement	RIW	Sweetwater	48 min
Jun 14, 2:59 PM MDT	Special Weather Statement	RIW	Sweetwater	46 min
Jun 14, 3:29 PM MDT	Special Weather Statement	RIW	Sweetwater	46 min

Nearby

Flash Flood Watches in Wyoming, 2015 Every flash flood watch in 2015

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.