Alert archive / Wyoming / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 18, NWS Riverton, WY
NWS Riverton, WY issued this severe thunderstorm warning at Jun 16, 2007, 5:23 PM MDT for Johnson County, Wyoming. It was in force for 67 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
- Jun 16, 2007, 5:23 PM MDT (23:23 UTC)
- Expired
- Jun 16, 2007, 6:30 PM MDT
- In force
- 67 min
- Issued by
- NWS Riverton, WY
- Area
- Counties, with a storm outline in the text
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 187 km from the middle of the area, began a volume at 23:23 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 |
|---|---|---|---|
| Jun 16, 4:10 PM MDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 11.4 hours before the alert went out and 182 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.
- Mixed-layer CAPE
- 460 J/kg
- Mixed-layer CIN
- -302 J/kg
- Mixed-layer LCL
- 1749 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Jun 16, 2:56 PM MDT, 2 hours 27 minutes earlier.
Area forecast discussion, Jun 16, 2:56 PM MDT, 2 hours 27 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 256 PM MDT SAT JUN 16 2007 .SHORT TERM...TONIGHT THROUGH TUESDAY CONVECTION ONGOING ACROSS THE CENTRAL AND NORTH AS EXPECTED. BEST INSTABILITY AND POTENTIAL FOR STRONG TO SEVERE STORMS OVER THE NORTH THE REST OF THE DAY INTO THE EVENING. FORECAST FOR THIS EVENING REFLECTS THIS WITH ONLY ISOLATED STORMS OVER THE REST OF THE AREA. CONVECTION LIKELY TO LINGER OVER THE NORTHERN MOUNTAINS AFTER MIDNIGHT BUT SHOULD BE JUST ISOLATED IN NATURE. TROUGH STILL ON TRACK TO MOVE ACROSS MONTANA SUNDAY WITH TRAILING AXIS THROUGH WY. COLD FRONT TO PUSH INTO NW WY BY SUNDAY MORNING...THEN SLIDE SOUTHEAST ACROSS THE AREA SUNDAY AFTERNOON. SOME CONCERN FOR ISOLATED STORMS WITH THE FRONT AS IT MOVES THROUGH CENTRAL WY SUNDAY PM. NAM HINTS AT SOMETHING WHILE GFS KEEPS ANY PRECIP OVER THE NORTH. CURRENT FORECAST HAS ISOLATED STORMS WITH BETTER CHANCE OVER THE NORTH SUNDAY AFTERNOON INTO THE EVENING. WILL NOT ALTER AND SEE HOW THINGS PLAY OUT. WILL BE WINDY OVER MOST AREAS AS GRADIENT TIGHTENS...30KT 700MB WIND SPEEDS AND THERMAL GRADIENT IS DECENT. COOLER HIGHS WITH BEST COOLING OVER THE NORTH AND NW. STILL WARM CENTRAL AND SOUTHEAST ZONES UNTIL FRONTAL PASSAGE. DECREASING CLOUDS SUNDAY NIGHT MOST AREAS. HOWEVER...LINGERING SHOWERS POSSIBLE OVER THE NORTHERN MTS AND EAST ZONES. MONDAY LOOKS DRY WITH STABLE AIRMASS. REDUCED PRECIP TO ISOLATED OVER THE NORTHERN MTS MONDAY PM AND EVENING. COOLER HIGHS MONDAY AND QUITE NICE FOR MID JUNE. CLEARING LATER ON MON NIGHT. TUESDAY APPEARS MOSTLY DRY AS WELL WITH ISOLATED SHOWERS OR STORMS OVER THE NORTHERN MTS AGAIN LATE IN THE DAY. MAY NEED TO SCALE BACK CURRENT AREA OF PRECIP CHANCE TUE PM. WARMER HIGHS TUESDAY. .LONG TERM...TUESDAY NIGHT THROUGH SATURDAY THE MEDIUM RANGE MODELS HAVE COME INTO BETTER AGREEMENT IN THE EXTENDED...WITH A VERY WARM AND MAINLY DRY PATTERN PREVAILING. AFTER TUESDAY...DIRTY RIDGING TAKES HOLD OVER THE REGION...WITH VERY WARM CONDITIONS AND THE POSSIBILITY OF ISOLATED AFTERNOON/ EVENING CONVECTION MAINLY OVER THE HIGHER TERRAIN. TEMPERATURES ARE EXPECTED TO BE 5 TO 10 DEGREES ABOVE AVERAGE THROUGH THE EXTENDED. && .AVIATION... SHOWERS AND THUNDERSTORMS CONTINUE TO MOVE THROUGH THE NORTHERN PART OF THE CWA THIS AFTERNOON...ESPECIALLY ALONG ON A NORTHEAST LINE FROM KPNA TO KGEY...WITH THE MORE INTENSE STORMS OCCURRING NORTH OF KU25 TO KGEY. STORMS WILL CONTINUE THROUGH THE AFTERNOON...WITH SOME ISOLATED STRONGER STORMS POSSIBLE. THESE STORMS WILL CREATE SOME VARIABLE AND GUSTY WINDS ACROSS NORTHERN AIRPORTS...FREQUENT LIGHTNING...AND SMALL HAIL. EXPECT MAINLY VFR CONDITIONS ACROSS THE SOUTHERN AIRPORTS THIS AFTERNOON AND EVENING...WITH PERIODS OF MVFR CONDITIONS ACROSS THE NORTHERN THIRD OF THE STATE. MOST SHOWER ACTIVITY SHOULD BEGIN TO WEAKEN AFTER 03Z THIS EVENING...WITH CLEARING ANTICIPATED ACROSS THE SOUTHERN TWO THIRDS OF THE STATE. && .FIRE WEATHER...THUNDERSTORM ACTIVITY WILL OCCUR OVER THE CENTRAL AND NORTH THIS EVENING WITH SOME OVERNIGHT ACTIVITY IN THE NORTH. EXPECT BREEZY TO WINDY AREAS. A COLD FRONT WILL MOVE INTO NORTHWEST WYOMING SUNDAY MORNING AND MOVE SOUTHEAST ACROSS THE DISTRICT DURING THE DAY SUNDAY. ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE POSSIBLE AS THE FRONT MOVES THROUGH THE REGION. COOLER TEMPERATURES FOR SUNDAY NIGHT AND MONDAY WITH MOSTLY DRY WEATHER AND HIGHER RELATIVE HUMIDITY. THEN A WARMING TREND AGAIN STARTING TUESDAY. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...AR LONG TERM...WM AVIATION...BRANHAM FIRE WEATHER...AR
Hazardous weather outlook, Jun 16, 4:27 PM MDT, 56 minutes before
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</html>In the hours before
Special weather statement, Jun 16, 4:15 PM MDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 415 PM MDT SAT JUN 16 2007 WYZ014-015-018-019-030-170200- EAST SWEETWATER COUNTY-GREEN MOUNTAINS AND RATTLESNAKE RANGE- LANDER FOOTHILLS-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- 415 PM MDT SAT JUN 16 2007 COLLAPSING ISOLATED SHOWERS AND THUNDERSTORMS ALONG THE WIND RIVER RANGE AND STRETCHING SOUTH INTO EASTERN SWEETWATER COUNTY MAY PRODUCE WIND GUSTS OF 50 TO 55 MPH THROUGH EARLY EVENING. GUSTY OUTFLOW WIND FROM THESE SHOWERS AND STORMS WILL BE ESPECIALLY PRONOUNCED NEAR THE FOOTHILLS OF THE WIND RIVER AND GREEN MOUNTAINS. A DRY AND WARM LOWER ATMOSPHERE WILL ALLOW LITTLE RAINFALL TO REACH THE GROUND WITH THESE SHOWERS AND STORMS. IMPACTED AREAS INCLUDE LANDER...JEFFREY CITY...SOUTH PASS CITY... ATLANTIC CITY...SWEETWATER STATION AND WAMSUTTER. MOTORISTS ON HIGHWAY 287 MAY EXPERIENCE GUSTY AND DANGEROUS CROSSWINDS NEAR THESE SHOWERS AND STORMS. PLEASE REPORT ANY WIND DAMAGE TO THE NATIONAL WEATHER SERVICE IN RIVERTON AT 1-800-211-1448.
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 5:16 PM MDT | Tornado Warning | RIW | Johnson | 29 min |
| Jun 16, 5:30 PM MDT | Tornado Warning | RIW | Johnson | 45 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2007Every severe thunderstorm warning in 2007
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.