Alert archive / Nebraska / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 103, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Sep 2, 1999, 5:40 PM MDT for Scotts Bluff County, Nebraska. It was in force for 35 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
- Sep 2, 1999, 5:40 PM MDT (23:40 UTC)
- Expired
- Sep 2, 1999, 6:15 PM MDT
- In force
- 35 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Scotts Bluff County, NE
The radar
The Cheyenne radar (KCYS), 120 km from the middle of the area, began a volume at 23:39 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 |
|---|---|---|---|
| Sep 2, 6:10 PM MDT | Hail 0.75 | Gering, NE | |
| Sep 2, 6:21 PM MDT | Hail 1.5 | Melbeta, NE | |
| Sep 2, 6:23 PM MDT | Hail 0.75 | Melbeta, NE |
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, 11.7 hours before the alert went out and 224 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
- 15 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 1045 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 19 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.
NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 2, 1:49 PM MDT, 3 hours 51 minutes earlier.
Area forecast discussion, Sep 2, 1:49 PM MDT, 3 hours 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 149 PM MDT THU SEP 2 1999 TODAY'S FORECAST VERY SIMILAR TO YESTERDAY. STALLED FRONTAL BOUNDARY ACROSS WY. STORMS DEVELOPED TO THE WEST OF CYS AND REPORTS AT THIS TIME ARE OF HEAVY RAIN NO HAIL. ALOFT LONG WAVE TROF TO THE WEST GIVING STRONG SW FLOW TO THE CWA. EMBEDDED SHORT WAVES WILL KICK OFF CONVECTIVE. AS USUAL TIMING OF WAVE ACROSS THE AREA WILL BE PROBLEM. MONSOONAL FLOW NOT AS STRONG TODAY BUT DEW POINTS STILL IN THE 60S IN ERN CWA. UPPER FEATURES SIMILAR ON ALL THE MODELS BUT NGM MOVES SFC LOW MORE QUICKLY TO THE EAST THAN ETA/AVN. THE RESULT IS NGM COMES AROUND TO A W/NW FLOW AND CUTS OFF THE PRECIP WHILE ETA/AVN ARE SLOWER AND THIS KEEPS THE CWA IN MORE UPSLOPE FLOW AND HENCE RAIN AND CLOUDS PERSIST INTO THE WEEKEND. PREFER THE ETA/AVN SO WILL KEEP WITH THE ATYPICAL WET PATTERN THROUGH SATURDAY. UPPER TROF PASSES AREA BY SUNDAY SO WILL PROBABLY GO DRY IN THE .EXTENDED. .CYS... WY...NONE. NE...NONE. GRIFFITH
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 6:43 PM MDT | Tornado Warning | CYS | Cheyenne | 32 min |
| Sep 2, 5:05 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 35 min |
| Sep 2, 3:13 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 47 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 1999Every severe thunderstorm warning in 1999
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.