Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 69, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 5, 1997, 3:35 PM MDT for Laramie County, Wyoming. It was in force for 55 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 5, 1997, 3:35 PM MDT (21:35 UTC)
- Expired
- Jul 5, 1997, 4:30 PM MDT
- In force
- 55 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 21:37 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 |
|---|---|---|---|
| Jul 5, 3:35 PM MDT | Hail 1 | Cheyenne, WY | |
| Jul 5, 4:00 PM MDT | Hail 1.75 | Burns, WY | |
| Jul 5, 4:20 PM MDT | Hail 1 | Burns, 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.6 hours before the alert went out and 202 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
- 2959 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jul 5, 10:00 AM MDT, 5 hours 35 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-060000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1000 AM MDT SAT JUL 5 1997 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MODERATE FOR THE SOUTHEAST CORNER OF THE AREA THIS AFTERNOON. THIS INCLUDES LARAMIE COUNTY WYOMING AND KIMBALL AND CHEYENNE COUNTIES OF NEBRASKA. ELSEWHERE TO THE NORTH AND WEST THE POTENTIAL FOR SEVERE WEATHER DROPS TO LOW. SPOTTER ACTIVATION MAY BE BE REQUIRED IN THE FAR SOUTHEAST PART TODAY. DISCUSSION....ALTHOUGH THE AIRMASS WILL BE A BIT COOLER...SOME MOISTURE WILL PROVIDE MODERATE INSTABILITIES IN THE SOUTHEAST CORNER OF THE WARNING AREA. AN UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THIS AFTERNOON...AIDING THUNDERSTORM DEVELOPMENT AND STRENGTH. THE MAIN THREAT IS EXPECTED TO BE HAIL AND BRIEF HEAVY RAIN. WCJIN-WYSE-WYNE COX
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 3:42 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 48 min |
| Jul 5, 4:30 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 45 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1997Every severe thunderstorm warning in 1997
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.