Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 84, NWS Riverton, WY

July 22, 2008Lincoln County, Teton County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 22, 2008, 7:37 PM MDT for Lincoln County, Teton County, Wyoming. It was in force for 25 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: Jul 22, 2008, 7:37 PM MDT (01:37 UTC)
Expired: Jul 22, 2008, 8:02 PM MDT
In force: 25 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

Counties Lincoln County, WY, Teton County, WY

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 22, 1:00 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

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 Jul 22, 1:51 PM MDT, 5 hours 46 minutes earlier.

Area forecast discussion, Jul 22, 1:51 PM MDT, 5 hours 46 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
151 PM MDT TUE JUL 22 2008

.SHORT TERM...TONIGHT THROUGH FRIDAY
SEVERE THUNDERSTORM WATCH COVERS THE ENTIRE FAR WEST THROUGH 9PM
THIS EVENING AS MOIST LOW LEVEL AIRMASS AND MAX HEATING INTERACT
WITH APPROACHING DISTURBANCE/SPEEDMAX FROM THE SOUTH. THE
SHORTWAVE APPEARS TO BE OVER ECNTRL NV/SWRN UT AT 19Z AND SHOULD
BE INTERACTING WITH VERY MOIST AIRMASS OVER NRN UTAH AND SWRN
WYO OVER THE NEXT 2-4 HOURS. IN ADDITION...FRONTAL BOUNDARY
CURRENTLY OVER SRN IDAHO WILL MOVE INTO FAR WEST WYO THIS EVENING
ADDING AN ADDITIONAL FOCUS FOR CONVECTION. STRONG STORMS OFF THE
UINTAS WILL ALSO HAVE TO BE WATCHED AS THEY MOVE ACROSS SWEETWATER
COUNTY. IF THESE BECOME TOO STRONG WE MAY NEED TO ADD SWEETWATER
TO THE SEVERE THUNDERSTORM WATCH.

ON WEDNESDAY...THE PLUME SHIFTS EWD BUT JUST FAR ENOUGH TO IMPACT
OUR SERN ZONES WITH THE POTENTIAL FOR A FEW STRONG STORMS. IVE
HIT THIS AREA WITH CHANCE POPS WEDNESDAY AFTERNOON AND EVENING. ON
THURSDAY...ADDITIONAL DRYING MOVES INTO THE AREA BUT THERE MAY
STILL BE ENOUGH LINGERING LOW LEVEL MOISTURE FOR ISOLATED STORMS
ACROSS THE FAR EAST AND NRN ZONES. RIDGE TRIES TO REBUILD FRIDAY WITH
MID LEVEL WARMING SUPPLYING A CAP ON CONVECTION. THE ONLY AREA
THAT MAY SEE ISOLATED STORMS WILL BE THE FAR SERN ZONES WHERE
SOME LINGERING LOW LEVEL MOISTURE MAY REMAIN. STORMS MAY DEVELOP
OFF THE UINTAS AND THEN TRACK NE ACROSS THE AREA. OTHERWISE IT
WILL BE CONTINUED VERY WARM TO HOT THROUGH THE PERIOD.

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY
FRIDAY LOOKS DRY OVER MUCH OF THE REGION. GFS FORECASTS A FAIRLY
STABLE AIRMASS. THE EAST ZONES MAY SEE ISOLATED ACTIVITY FRIDAY
EVENING. ON SATURDAY THE UPPER HIGH NUDGES BACK NORTH INTO OUR
AREA. GFS MODEL HINTS AT FAIRLY DRY MID LEVELS WITH SLIGHTLY
UNSTABLE AIRMASS IN THE AFTERNOON AND EVENING. ISOLATED STORMS AT
BEST WILL OCCUR...MAINLY OVER AND NEAR THE MOUNTAINS. THE GFS
PAINTS AN UNSETTLED DAY ON SUNDAY WITH A DECENT SHORTWAVE ROTATING
TOWARD THE AREA. ECMWF MODEL IS FASTER WITH A SHORTWAVE EARLY
SUNDAY WHICH WOULD LEAD TO LESS STORMS. LEANING TOWARD GFS MODEL
FOR NOW. MONDAY AND TUESDAY LOOK INTERESTING AS MID LEVEL MOISTURE
IS FORECAST INTO THE REGION. SHORTWAVES IN THE SOUTHWEST FLOW
ALOFT COULD AID IN STORM FORMATION. AIRMASS GETS MORE UNSTABLE AND
PRECIPITABLE WATER VALUES START TO INCREASE. WILL KEEP LOW PRECIP
CHANCES GOING MONDAY AND TUESDAY. HIGH TEMPS WILL REMAIN VERY WARM
TO HOT DURING THE EXTENDED PERIOD.

&&

.AVIATION...
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO IMPACT THE STATE THIS
EVENING. SOME STORMS MAY BECOME SEVERE IN THIS SYSTEM PRODUCING
LARGE HAIL AND DAMAGING WINDS OVER THE WESTERN THIRD OF THE STATE.
THESE SEVERE STORMS MAY CREATE PERIODS OF IFR TO LIFR CONDITIONS IF
THEY MOVE OVER WESTERN AIRPORTS...INCLUDING KBPI...KPNA...AND KJAC.
THE STRONGER STORMS SHOULD TAPER OFF BY 04Z THIS EVENING...THOUGH
SCATTERED TO ISOLATED SHOWER ACTIVITY WILL BE FOUND ACROSS THE STATE
THROUGH THE OVERNIGHT HOURS. ANOTHER UPPER LEVEL DISTURBANCE WILL
BRING ANOTHER ROUND OF ISOLATED TO SCATTERED SHOWERS AND
THUNDERSTORMS ACROSS EASTERN WYOMING WEDNESDAY AFTERNOON...CREATING
GUSTY WINDS...AND POTENTIALLY MVFR CEILINGS.

&&

.FIRE WEATHER...
ACTIVE AFTERNOON AND EVENING OF THUNDERSTORMS EXPECTED ACROSS
WESTERN WYOMING. THE POTENTIAL FOR LARGE HAIL...DAMAGING WINDS
AND HEAVY RAIN WILL EXIST THROUGH THE EVENING HOURS. SCATTERED
SHOWERS AND THUNDERSTORMS EAST OF THE DIVIDE WILL ALSO OCCUR WITH
THE STRONGEST STORMS PRODUCING HAIL...GUSTY WIND TO 50 MPH AND
LOCALLY HEAVY RAIN. SOME DRIER AIR WILL PUSH INTO THE WEST ON
WEDNESDAY BUT THE SUBTROPICAL MOISTURE PLUME WILL THEN TAKE AIM ON
AREAS EAST OF THE DIVIDE...ESPECIALLY FROM RKS TO CPR. FURTHER
DRYING SHOULD OCCUR THURSDAY INTO FRIDAY WITH VERY WARM TO HOT
CONDITIONS CONTINUING.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM...SKRBAC
LONG TERM...AR
AVIATION...BRANHAM
FIRE WEATHER...SKRBAC

Hazardous weather outlook, Jul 22, 1:07 PM MDT, 6 hours 30 minutes before

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In the hours before

Special weather statement, Jul 22, 3:59 PM MDT, 3 hours 38 minutes before

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Special weather statement, Jul 22, 4:07 PM MDT, 3 hours 30 minutes before

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Special weather statement, Jul 22, 5:12 PM MDT, 2 hours 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
512 PM MDT TUE JUL 22 2008

WYZ020-022-230015-
CASPER MOUNTAIN-NATRONA COUNTY LOWER ELEVATIONS-
512 PM MDT TUE JUL 22 2008

...SIGNIFICANT WEATHER ADVISORY FOR NATRONA COUNTY...

AT 506 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR BEARTRAP MEADOWS COUNTY PARK...OR 10 MILES
SOUTH OF CASPER...MOVING NORTHEAST AT 21 MPH.

RAINFALL OF UP TO ONE QUARTER INCH AND PEA SIZE HAIL ARE POSSIBLE
WITH THIS STORM.

RESIDENTS IN EASTERN NATRONA COUNTY...INCLUDING THE LOCATIONS OF
HOGADON SKI AREA...BEARTRAP MEADOWS COUNTY PARK...I25 EXIT 182 AND
EDNESS K WILKINS STATE PARK...SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
TUESDAY EVENING FOR NORTHWESTERN WYOMING.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4278 10607 4273 10607 4258 10633 4271 10650
      4299 10616 4292 10606 4288 10607 4287 10606
      4279 10606
TIME...MOT...LOC 2312Z 223DEG 18KT 4272 10631

T. BAKER

Special weather statement, Jul 22, 5:28 PM MDT, 2 hours 9 minutes before

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Special weather statement, Jul 22, 5:32 PM MDT, 2 hours 5 minutes before

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Special weather statement, Jul 22, 5:52 PM MDT, 1 hour 45 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 6:06 PM MDT	Special Weather Statement	RIW		54 min
Jul 22, 6:50 PM MDT	Severe Thunderstorm Warning	RIW	Teton	40 min
Jul 22, 6:52 PM MDT	Special Weather Statement	RIW	Natrona	53 min
Jul 22, 6:54 PM MDT	Special Weather Statement	RIW		66 min
Jul 22, 7:03 PM MDT	Special Weather Statement	RIW	Fremont	87 min
Jul 22, 7:45 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Hot Springs	26 min
Jul 22, 8:38 PM MDT	Special Weather Statement	RIW	Big Horn	52 min
Jul 22, 10:59 PM MDT	Special Weather Statement	RIW	Johnson	61 min
Jul 23, 3:05 AM MDT	Special Weather Statement	RIW		55 min
Jul 23, 1:06 PM MDT	Special Weather Statement	RIW	Johnson	54 min
Jul 23, 1:17 PM MDT	Special Weather Statement	RIW	Sublette	58 min
Jul 23, 1:20 PM MDT	Special Weather Statement	RIW	Sweetwater	55 min
Jul 23, 2:07 PM MDT	Special Weather Statement	RIW	Johnson	23 min
Jul 23, 2:12 PM MDT	Special Weather Statement	RIW	Sublette	63 min
Jul 23, 4:25 PM MDT	Special Weather Statement	RIW	Johnson	65 min
Jul 23, 4:50 PM MDT	Special Weather Statement	RIW	Sweetwater	55 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.