Alert archive / Wyoming / Flash Flood Watches in 2015

Flash Flood Watch 4, NWS Riverton, WY

June 3, 20157 counties in Wyoming

NWS Riverton, WY issued this flash flood watch at Jun 3, 2015, 2:38 AM MDT for 7 counties in Wyoming. It took effect at Jun 3, 2015, 12:00 PM MDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jun 3, 2015, 2:38 AM MDT (08:38 UTC)
In effect from
Jun 3, 2015, 12:00 PM MDT
Expired
Jun 4, 2015, 12:00 AM MDT
In force
12 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, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 93 km from the middle of the area, began a volume at 08:43 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, 8.6 hours before the alert went out and 90 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, Riverton, WY at 00:00Z on 2015-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 2015-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
6 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
2737 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 2, 10:38 PM MDT, 4 hours earlier.

Area forecast discussion, Jun 2, 10:38 PM MDT, 4 hours before
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Hazardous weather outlook, Jun 2, 4:40 AM MDT, 21 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
440 AM MDT TUE JUN 2 2015

WYZ001>020-022>030-031200-
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-
440 AM MDT TUE JUN 2 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL
WYOMING.

...FLOOD WARNING FOR PORTIONS OF THE WIND RIVER THROUGH
WEDNESDAY...

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS EXPECTED TODAY. SOME STORMS ACROSS
PORTIONS OF JOHNSON COUNTY AND THE EASTERN BIGHORN BASIN MAY
BECOME SEVERE WITH DAMAGING WIND. OTHER STORMS ACROSS THE AREA
MAY HAVE GUSTY WIND. ALL STORMS WILL HAVE THE POTENTIAL FOR SMALL
HAIL AND FREQUENT LIGHTNING ALONG WITH PERIODS OF MODERATE TO
HEAVY RAINFALL. MOST ACTIVITY SHOULD WEAKEN THROUGH THE EVENING.

RIVERS AND SMALL STREAMS WILL BE RUNNING HIGH WITH A FEW CAUSING
SOME MINOR FLOODING. ADDITIONAL HEAVY RAIN COULD RESULT IN
ADDITIONAL LOCALIZED FLOODING...ESPECIALLY ALONG SMALL CREEKS IN
MOUNTAINS AND ADJACENT FOOTHILLS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

WEDNESDAY THROUGH THURSDAY...AFTERNOON SHOWERS AND THUNDERSTORMS
WILL BE POSSIBLE. SOME STORMS MAY BECOME STRONG WITH GUSTY WIND
AND HAIL. RIVERS AND CREEKS WILL REMAIN HIGH...WITH A FEW CAUSING
SOME MINOR FLOODING.

FRIDAY THROUGH MONDAY...ISOLATED TO SCATTERED THUNDERSTORMS EACH
DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER TODAY
INCLUDING WIND STRONGER THAN 45 MPH...HAIL LARGER THAN
PEAS...CREEKS RUNNING AT OR ABOVE BANKFULL...AND ANY SIGNIFICANT
RAINFALL WHICH RESULTS IN LOCALIZED FLOODING. THANK YOU.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 2, 6:06 PM MDTTornado WarningRIWJohnson24 min
Jun 2, 6:28 PM MDTSevere Thunderstorm WarningRIWJohnson32 min
Jun 2, 6:37 PM MDTSpecial Weather StatementRIW38 min
Jun 3, 2:07 PM MDTSpecial Weather StatementRIW38 min
Jun 3, 2:13 PM MDTSpecial Weather StatementRIWJohnson47 min
Jun 3, 3:22 PM MDTSpecial Weather StatementRIWHot Springs38 min
Jun 3, 3:25 PM MDTSpecial Weather StatementRIWJohnson50 min
Jun 3, 3:48 PM MDTSpecial Weather StatementRIWNatrona42 min
Jun 3, 4:10 PM MDTSpecial Weather StatementRIWHot Springs50 min
Jun 3, 4:14 PM MDTAreal Flood AdvisoryRIWJohnson3 hr
Jun 3, 4:28 PM MDTSpecial Weather StatementRIWNatrona47 min
Jun 3, 4:32 PM MDTSevere Thunderstorm WarningRIWBig Horn, Hot Springs, Washakie43 min
Jun 3, 4:40 PM MDTSpecial Weather StatementRIWHot Springs50 min
Jun 3, 4:43 PM MDTSevere Thunderstorm WarningRIWNatrona47 min
Jun 3, 5:04 PM MDTAreal Flood AdvisoryRIWHot Springs116 min
Jun 3, 5:16 PM MDTSevere Thunderstorm WarningRIWWashakie44 min
Jun 3, 5:38 PM MDTSevere Thunderstorm WarningRIWJohnson52 min
Jun 3, 5:41 PM MDTSpecial Weather StatementRIWNatrona49 min
Jun 3, 5:46 PM MDTSpecial Weather StatementRIW44 min
Jun 3, 5:55 PM MDTSevere Thunderstorm WarningRIWJohnson, Natrona26 min

Nearby

Flash Flood Watches in Wyoming, 2015Every 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.