Alert archive / Wyoming / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 52, NWS Riverton, WY

August 10, 2005Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Aug 10, 2005, 6:10 PM MDT for Fremont County, Wyoming. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 10, 2005, 6:10 PM MDT (00:10 UTC)
Expired: Aug 10, 2005, 7:15 PM MDT
In force: 65 min
Issued by: NWS Riverton, WY
Area: Counties, with a storm outline in the text

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 00:14 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 10, 1:35 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.2 hours before the alert went out and 369 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: 145 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 3099 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 37 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 severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 10, 3:18 PM MDT, 2 hours 52 minutes earlier.

Area forecast discussion, Aug 10, 3:18 PM MDT, 2 hours 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
318 PM MDT WED AUG 10 2005

.SHORT TERM...TONIGHT THROUGH SATURDAY...

SEVERE THUNDERSTORM WATCH CONTINUES THROUGH 9 PM THIS EVENING ACROSS
OUR NORTHERN ZONES. ACTIVE SHORTWAVE WILL CONTINUE TO INTERACT WITH A
MOIST AND UNSTABLE AIRMASS TO PRODUCE THE POSSIBILITY OF SEVERE
WEATHER THROUGH THE EVENING HOURS. NO REPORTS YET BUT SOME SMALL TO
MARBLE SIZE HAIL REPORTS. IN ADDITION...WEEK BUT FAIRLY DEEP E-SE
FLOW UP TO H7 COMBINED WITH WESTERLY FLOW ALOFT AND INTERACTION WITH
SURFACE FRONT AND SOUTHWEST SURFACE WINDS ARE CREATING SOME
STATIONARY BACK BUILDING STORMS IN NW NATRONA AND NOW MAYBE
NORTHEAST FREMONT COUNTY. ACTIVE EVENING IN STORE AS THIS SHORTWAVE
MOVES ACROSS THE NORTH AND INTERACTS WITH HIGHER THETA AIR AND
POSSIBLE RIGHT ENTRANCE REGION JET DYNAMICS. BY TOMORROW...MOIST
BOUNDARY HOLDS IN THE EAST WITH BEST CHANCE FOR MORE STORMS IN OUR
EASTERN ZONES. ON FRIDAY...FRONTAL BOUNDARY WILL PUSH UP AGAINST
THE CONTINENTAL DIVIDE AS MAIN SHORTWAVE DIVES SOUTHEAST OUT OF SWRN
CANADA. INSTABILITY AXIS SHOULD BE ALONG THE SPINE OF THE WIND
RIVER MOUNTAINS UP INTO THE SRN ABSAROKAS WITH MOIST EASTERLY FLOW
EAST OF THE THERE. AIRMASS MUCH MORE STABLE IN OUR NERN ZONES. COLD
FRONT PUSHES THROUGH MOST IF NOT THE ENTIRE AREA FRIDAY NIGHT INTO
SATURDAY WITH MUCH MORE STABLE AIRMASS AND GO WITH IDEA OF LOTS OF
CLOUDS AND LOW LEVEL MOISTURE WITH A SLIGHT CHANCE OF RAIN SHOWERS
ONLY. TEMPERATURES WILL COOL CONSIDERABLY FRIDAY AND SATURDAY WITH
READING IN THE 60S AND 70S MOST AREAS...COOLEST IN THE NORTH AND
EAST.

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...
MEDIUM RANGE GUIDANCE AND ENSEMBLES IN OVERALL GOOD AGREEMENT
ESPECIALLY INTO MONDAY. WEST NORTHWEST UPPER FLOW WILL DOMINATE THE
REGION. A SERIES OF UPPER LEVEL DISTURBANCES WILL PUSH ACROSS THE
REGION WITH SURFACE FRONTAL BOUNDARY MEANDERING ACROSS AREAS EAST OF
DIVIDE. THIS SHOULD ALL ACT ON SOME LATE DAY INSTABILITY FOR A
CONTINUED ISOLATED RISK OF STORMS MOST AREAS. NO MONSOON CONNECTION
WITH THIS FLOW...SO STORMS SHOULD BE FEW AND FAR BETWEEN. BY TUESDAY
AND WEDNESDAY...LATEST GFS DOES BEGIN TO BACK THE FLOW TO MORE
SOUTHERLY TO PUSH BETTER MOISTURE BACK NORTH. THIS IS WHERE ENSEMBLES
BEGIN TO DIVERGE SO STILL MUCH UNCERTAINTY THIS FAR OUT...BUT WARRANT
MAINTAINING SLIGHT RISK OF STORMS INTO MID WEEK. HAVE CONTINUED
TREND OF COOLING TEMPERATURES FOR THE WEEKEND WITH LATEST GFS
CONSISTENT WITH GOOD COLD AIR ADVECTION BEHIND STRONG FRONTAL
PASSAGE SATURDAY. TEMPERATURES EXPECTED TO GRADUALLY WARM INTO THE
MIDDLE OF NEXT WEEK ON WESTERLY FLOW.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...SEVERE THUNDERSTORM WATCH THROUGH
9 PM FOR BIG HORN...NATRONA...WASHAKIE...HOT SPRINGS...PARK AND
JOHNSON COUNTIES.

&&

SHORT TERM...SKRBAC
LONG TERM...FRIEDERS

Hazardous weather outlook, Aug 10, 3:43 PM MDT, 2 hours 27 minutes before

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In the hours before

Special weather statement, Aug 10, 4:57 PM MDT, 1 hour 13 minutes before

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Nearby

Severe Thunderstorm Warnings in Wyoming, 2005 Every severe thunderstorm warning in 2005

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.