Alert archive / Wyoming / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 149, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 18, 2009, 1:35 AM MDT for Goshen County, Laramie County, Wyoming. It was in force for 42 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 18, 2009, 1:35 AM MDT (07:35 UTC)
- Expired
- Jul 18, 2009, 2:17 AM MDT
- In force
- 42 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Goshen County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 65 km from the middle of the area, began a volume at 07:38 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
Denver, CO (KDNR), launched 00:00Z, 7.6 hours before the alert went out and 230 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3559 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 17, 1:39 PM MDT, 11 hours 56 minutes earlier.
Area forecast discussion, Jul 17, 1:39 PM MDT, 11 hours 56 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 139 PM MDT FRI JUL 17 2009 .SHORT TERM...NW FLOW WILL OCCUR ALOFT THIS AFTERNOON AND EVENING AS AN UPPER RIDGE BUILDS OVER THE WEST. DEW POINTS IN THE NEBRASKA PANHANDLE THIS AFTERNOON ARE IN THE 50S. LIS INDICATE VERY UNSTABLE AIRMASS OVER THE AREA EAST OF THE LAR RANGE AND CAPE VALUES ARE IN THE 1000 TO 2000 J/KG RANGE. TORNADO WATCH HAS BEEN ISSUED FOR PARTS OF SE WY AND THE NEB PANHANDLE DUE TO DEEP LAYER SHEER. A JET MAX AT 200 MB WILL ALSO AID IN THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND EVENING. THE UPPER RIDGE AXIS WILL MOVE EAST OVER THE NORTHERN ROCKIES ON SAT . MID LEVEL MOISTURE AND UNSTABLE CONDITIONS WILL OCCUR ONCE AGAIN SAT AFTERNOON. WILL KEEP ISOLATED THUNDERSTORMS...ESPECIALLY EAST OF THE LARAMIE RANGE FOR SAT AFT AND EVENING. ON SUN...NW FLOW WILL CONT ALOFT AND THE UPPER RIDGE AXIS WILL EXTEND FROM THE NORTHERN PLAINS TO THE DESERT SW. WILL KEEP DRY CONDITIONS IN THE FORECAST...BUT CANNOT RULE OUT A FEW THUNDERSTORMS EAST OF THE LARAMIE RANGE. HIGH TEMPERATURES WILL BE AROUND NORMAL SATURDAY...THEN AS THERMAL RIDGE MOVES OVER THE CWA ON SUNDAY...EXPECT TEMPERATURES TO BE SEVERAL DEGREES ABOVE NORMAL. .LONG TERM...SUNDAY NIGHT THROUGH FRIDAY. UPPER SHORT WAVE MOVING NORTH OF AREA WILL ALLOW FOR A COLD FRONT TO PUSH SOUTH SUNDAY NIGHT INTO MONDAY...WITH CHANCES OF SHOWERS OR THUNDERSTORMS PERSISTING INTO TUESDAY. FOR WEDNESDAY THROUGH FRIDAY IT LOOKS LIKE DIURANALLY DRIVE CONVECTION WITH WARMER TEMPERATURES. ON FRIDAY...A BACKDOOR COLD FRONT IS EXPECTED WITH A CONTINUATION OF SHOWERS OR THUNDERSTORMS AND SOMEWHAT COOLER TEMPERATURES. && .AVIATION...VFR CONDITIONS WILL PREVAIL OVER THE AREA THROUGH SUNDAY WITH THE EXCEPTION OF AREAS IN AND NEAR LATE DAY THUNDERSTORMS WHERE LOW CIGS AND VSBYS WILL RESULT IN MVFR OR BRIEF IFR CONDITIONS. && .FIRE WEATHER...FUELS CONTINUE TO DRY ACROSS THE DISTRICT...HOWEVER WIND SPEEDS SHOULD REMAIN BELOW RED FLAG CRITERIA. LOW RHS WILL OCCUR ESPECIALLY WEST OF THE LARAMIE RANGE THROUGH THE WEEKEND. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION...KMD LONG TERM...EISE
Hazardous weather outlook, Jul 17, 7:04 PM MDT, 6 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 704 PM MDT FRI JUL 17 2009 WYZ059>066-181945- CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON-SNOWY RANGE- NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- 704 PM MDT FRI JUL 17 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...WATER...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ001-003-019>021-054-055-WYZ067>070-181945- SIOUX-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 704 PM MDT FRI JUL 17 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...WATER..AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-181945- DAWES- 704 PM MDT FRI JUL 17 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...WATER...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WEILAND
In the hours before
Special weather statement, Jul 18, 12:47 AM MDT, 48 minutes before
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</html>Local storm report, Jul 18, 12:53 AM MDT, 42 minutes before
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</html>Special weather statement, Jul 18, 1:17 AM MDT, 18 minutes before
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</html>Local storm report, Jul 18, 1:34 AM MDT, 1 minute before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 2:06 AM MDT | Severe Thunderstorm Warning | CYS | Kimball | 39 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2009Every severe thunderstorm warning in 2009
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.