Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 12, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 1, 2002, 6:51 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 39 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 1, 2002, 6:51 PM MDT (00:51 UTC)
- Expired
- Jun 1, 2002, 7:30 PM MDT
- In force
- 39 min
- Issued by
- NWS Cheyenne, WY
- Area
- Counties, with a storm outline in the text
Counties Goshen County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 00:54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 1, 6:59 PM MDT | Thunderstorm Wind 55 M | Torrington, WY | 63 mph wind gust at airport |
| Jun 1, 7:00 PM MDT | Hail 1.75 | Torrington, WY |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
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 1, 4:30 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 0.9 hours before the alert went out and 264 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
- 2242 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 280 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
385 WUUS55 KCYS 020052 SVRCYS WYC015-031-020130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED TYPO NATIONAL WEATHER SERVICE CHEYENNE WY 649 PM MDT SAT JUN 1 2002 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GOSHEN COUNTY IN SOUTHEAST WYOMING THIS INCLUDES THE CITY OF TORRINGTON PLATTE COUNTY IN SOUTHEAST WYOMING THIS INCLUDES THE CITIES OF...WHEATLAND...GUERNSEY * UNTIL 730 PM MDT * AT 643 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES SOUTH OF TORRINGTON...OR ABOUT 13 MILES SOUTHWEST OF MORRILL...MOVING NORTH AT 45 MPH. ANOTHER VERY STRONG STORM WAS NEAR WHEATLAND...MOVING NORTH AT 40 MPH. IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT SATURDAY EVENING FOR SOUTHEASTERN WYOMING. LAT...LON 4185 10522 4179 10407 4260 10407 4259 10527 && RE WCJIN-WYSE
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 Jun 1, 3:35 PM MDT, 3 hours 16 minutes earlier.
Area forecast discussion, Jun 1, 3:35 PM MDT, 3 hours 16 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 335 PM MDT SAT JUN 1 2002 QSTNRY FNT ROUGHLY FROM DGW TO SE CRNR WY WITH BISECTED AREA TO THE ENE RIPE FOR TSTMS LATE THIS AFTN AND EVENING. LAPS SHOWS 2000-3000 J/KG CAPES OVER THIS AREA ALONG WITH LIFTED INDICES OF -3 TO -6. SPC HAS MUCH OF THIS IN MDT RISK. WHILE TSTMS HAVE BEEN RATHER SLOW TO DVLP AND GET STRONGER... STILL FEEL THIS WILL HAPPEN IN THE ABOVE DISCUSSED AREA THIS EVENING AS SHORWAVE TROFS ROLL UP FROM THE SW. 20 PERCENT POPS WILL BE ENOUGH FOR EVENING TSTMS ALG AND W OF I-25 THIS EVENING. WITH DRIER/DOWNSLOPE FLOW SETTING UP BEHIND THE SHORTWAVES ON SUNDAY...A MOSTLY SUNNY DAY ON TAP WITH ONLY ISOLD AFTN TSTMS. TEMPS WILL BE NOT QUITE AS WARM...ESPECIALLY NRN/WRN CWA. STRONG CDFNT IS STILL EXPECTED TO COME S SUNDAY NIGHT...WITH SCT POPS IN ORDER FOR SHWRS AND EVENING TSTMS...NRN PART OF CWA MAY ACTUALLY SEE THIS OCCURRING LATE SUN AFTN. A MUCH COOLER AND SHOWERY DAY ON TAP FOR MON WITH WEAK UPPER LOW NEAR LAS. THESE SHWRS WILL PERSIST MON NIGHT AND GIVEN 1000-500MB THICKNESSES... RAIN WILL LIKELY CHANGE TO SNOW IN THE MTNS AND PERHAPS MIX AT RWL/LAR. SCT SHWRS LINGERING ON TUESDAY ALONG WITH QUITE COOL TEMPS. NO SGFNT MODEL DIFFERENCES EXPECT FOR WRMR FWC MAX TEMPS MONDAY VS. COOLER FAN WHICH LOOKS TOO MUCH SO. .EXTENDED... LOOK FOR IMPROVING CONDITIONS BY MIDWEEK AS UPPER TROF PULLS AWAY AND SHORT WAVE RIDGE BEGINS BUILDING OVER WY. STILL A CHANCE OF SHOWERS IN/NEAR THE MOUNTAINS ON WEDNESDAY IN NORTHWEST FLOW ALOFT... FOLLOWED BY A DRYING TREND WITH WARMING TREND. .CYS... WY...NONE. NE...NONE. HATTEN/BANN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 6:52 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 38 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.