Alert archive / Wyoming / Tornado Warnings in 2010
Tornado Warning 21, NWS Cheyenne, WY
NWS Cheyenne, WY issued this tornado warning at Jun 20, 2010, 4:02 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 28 min. 11 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 20, 2010, 4:02 PM MDT (22:02 UTC)
- Expired
- Jun 20, 2010, 4:30 PM MDT
- In force
- 28 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Goshen County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 72 km from the middle of the area, began a volume at 22:01 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 20, 4:03 PM MDT | FUNNEL CLOUD | 2 Sw Chugwater, WY | THE REPORT WAS 2 FUNNEL CLOUDS. |
| Jun 20, 4:03 PM MDT | TORNADO | 2 Ese Chugwater, WY | ESPOTTER REPORT. |
| Jun 20, 4:04 PM MDT | FUNNEL CLOUD | 1 Wsw Chugwater, WY | |
| Jun 20, 4:18 PM MDT | HAIL 2 | 4 E Chugwater, WY | |
| Jun 20, 4:25 PM MDT | HAIL 1.75 | Chugwater, WY | |
| Jun 20, 4:25 PM MDT | HAIL 4 | Chugwater, WY | |
| Jun 20, 4:26 PM MDT | TORNADO | 4 Ese Chugwater, WY | |
| Jun 20, 4:26 PM MDT | TORNADO | 7 E Chugwater, WY | |
| Jun 20, 4:33 PM MDT | HAIL 2.75 | 5 E Chugwater, WY | |
| Jun 20, 4:35 PM MDT | TORNADO | 2 S Chugwater, WY | SPOTTER WAS 5 EAST OF CHUGWATER LOOKING SOUTHWEST. |
| Jun 20, 4:40 PM MDT | HAIL 4 | 6 E Chugwater, WY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 20, 1:30 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.0 hours before the alert went out and 245 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
- 1555 J/kg
- Mixed-layer CIN
- -237 J/kg
- Mixed-layer LCL
- 1177 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
630 WFUS55 KCYS 202202 TORCYS WYC015-031-202230- /O.NEW.KCYS.TO.W.0021.100620T2202Z-100620T2230Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 402 PM MDT SUN JUN 20 2010 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * TORNADO WARNING FOR... SOUTHWESTERN GOSHEN COUNTY IN SOUTHEAST WYOMING... SOUTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING... * UNTIL 430 PM MDT * AT 401 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD NEAR CHUGWATER...OR 21 MILES SOUTH OF WHEATLAND. A TORNADO MAY DEVELOP AT ANY TIME. DOPPLER RADAR SHOWED THIS DANGEROUS STORM MOVING EAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... CHUGWATER AND I-25 EXIT 54. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 49 AND 63. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4187 10445 4168 10451 4167 10497 4185 10496 TIME...MOT...LOC 2202Z 270DEG 22KT 4176 10484 $$ TJT
1 follow-up statement
753 WWUS55 KCYS 202221 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 421 PM MDT SUN JUN 20 2010 WYC015-031-202230- /O.CON.KCYS.TO.W.0021.000000T0000Z-100620T2230Z/ GOSHEN WY-PLATTE WY- 421 PM MDT SUN JUN 20 2010 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN PLATTE AND SOUTHWESTERN GOSHEN COUNTIES UNTIL 430 PM MDT... AT 415 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A BRIEF TORNADO TOUCHDOWN NEAR CHUGWATER. THIS TORNADO WAS LOCATED NEAR CHUGWATER...OR 23 MILES SOUTHEAST OF WHEATLAND.... LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF EXTREME SOUTHEASTERN PLATTE AND EXTREME SOUTHWESTERN GOSHEN COUNTIES. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 49 AND 63. IN ADDITION...2 INCH DIAMETER HAIL WAS REPORTED 4 MILES EAST OF CHUGWATER. && LAT...LON 4187 10445 4168 10451 4167 10497 4185 10496 TIME...MOT...LOC 2219Z 270DEG 22KT 4176 10470 $$ TJT
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 6:11 PM MDT | Areal Flood Advisory | CYS | Niobrara | 3 hr |
| Jun 19, 6:25 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 29 min |
| Jun 19, 9:21 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 54 min |
| Jun 20, 12:05 AM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 25 min |
| Jun 20, 1:59 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 35 min |
| Jun 20, 3:24 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 51 min |
| Jun 20, 3:42 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 39 min |
| Jun 20, 3:56 PM MDT | Flash Flood Warning | CYS | Goshen, Platte | 5 hr |
| Jun 20, 4:02 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 58 min |
| Jun 20, 4:30 PM MDT | Tornado Warning | CYS | Goshen, Laramie, Platte | 30 min |
| Jun 20, 4:58 PM MDT | Tornado Warning | CYS | Goshen, Platte | 32 min |
| Jun 20, 5:39 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Laramie | 51 min |
| Jun 20, 5:49 PM MDT | Tornado Warning | CYS | Converse | 41 min |
Nearby
Tornado Warnings in Wyoming, 2010Every tornado warning in 2010Tornadoes in 2010
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.