Alert archive / California / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 62, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 1, 1997, 2:12 PM PDT for San Bernardino County, California. It was in force for 58 min. 2 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 1, 1997, 2:12 PM PDT (21:12 UTC)
- Expired
- Sep 1, 1997, 3:10 PM PDT
- In force
- 58 min
- Issued by
- NWS Las Vegas, NV
- Area
- Whole counties
County San Bernardino County, CA
The radar
The Edwards AFB radar (KEYX), 129 km from the middle of the area, began a volume at 21:14 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 1, 2:46 PM PDT | Thunderstorm Wind 75 | Twenty Nine Palms, CA | A thunderstorm wind gust of 86 mph was recorded at Twentynine Palms Airport. |
| Sep 1, 3:20 PM PDT | Thunderstorm Wind 90 | Twenty Nine Palms, CA | Three gusts of 90 knots (104 mph) were reported at the Twentynine Palms Airport. |
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 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 Las Vegas, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 1, 9:17 AM PDT, 4 hours 55 minutes earlier.
Area forecast discussion, Sep 1, 9:17 AM PDT, 4 hours 55 minutes before
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 915 AM PDT MON SEP 1 1997 COORD WITH RNO/PHX/LAX AND FLG AND WILL BE ISSUING FLASH FLOOD WATCH FOR NVZ016-018>022...CAZ028-029 AND AZZ031-001>003. UPDTS SCHEDULED FOR 10 AM RELEASE. WILL WAIT FOR AFT TO SEE IF WATCH MAY NEED TO BE EXTENDED TO AREAS FARTHER N AND W. 12Z UA CHARTS AND SOUNDINGS POINTING TO AN ACTIVE TSTM DAY FOR SRN NV/WRN AZ AND SERN CA. DRA SOUNDING SHOWS A DRAMATIC 24 HR INCR IN MSTR FRM SFC-400 MB WITH PRECIPITABLE WTR UP FRM .41 TO .86 INCHES. 8H DEWPOINTS HAVE INCRD ACRS SRN NV TO BTWN 6-8 DEGREES WITH INCRG S-SELY FLOW UP TO 5H LIKELY TO ADVECT ADDITIONAL MSTR INTO REGION TDA. WITH PASSAGE OF MINOR UPR TROF...5H COOLING NOTED ACRS SRN NV/NRN AZ WITH WBZ HGTS AND FREEZING LVLS GETTING INTO A FAVORABLE RANGE FOR HAIL. SUFFICIENT INSTABILITY FOR TSTMS TO FIRE BY LATE MORNING OVR MTNS WHICH IS WHERE I EXPECT THINGS TO POP FIRST. DYNAMICS THE FINAL INGREDIENT TDA AND THAT IS WHERE MODELS BEGIN TO DISAGREE A BIT. VORT VCNTY CENTRAL GLF CA EASY TO IDENTIFY ON WTR VAPOR LOOPS AND IS MOVG NWD AROUND PERIPHERY OF UPR RDG. ETA CONTS TO BE MOST AGGRESSIVE AND FARTHEST E WITH VORT TRACK...BRINGING IT UP INTO WRN AZ (VCNTY IFP/LHU) BY 00Z...WHILE NGM WEAKER AND A LTL FARTHER E. ETA SOLUTION LOOKING BEST BUT EVEN ACCEPTING A COMPROMISE SOLUTION...DYNAMICS WILL BE INCRG ACRS WRN AZ/SRN CA THIS AFT AND INTO SRN NV THIS EVENING...ADDING THE FINAL TRIGGER FOR SCTD TO NUMEROUS TSTMS. AGAIN WILL WATCH TO SEE HOW THINGS DVLP THIS AFT BUT DYNAMICS FRM APCHG VORT MAY KEEP TSTMS GOING WELL INTO THE NIGHT PER CURRENT FCST. NO OTHER CHGS TO REMAINDER OF FCST. L AS 343. NEMETH SRN NV...FLASH FLOOD WATCH 17Z-04Z NVZ016-018>22 ERN CA...FLASH FLOOD WATCH 17Z-04Z CAZ029-029 NW AZ ...FLASH FLOOD WATCH 17Z-04Z AZZ0031-001>003
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 2:12 PM PDT | Flash Flood Warning | VEF | San Bernardino | 58 min |
| Sep 1, 3:08 PM PDT | Flash Flood Warning | VEF | San Bernardino | 67 min |
| Sep 1, 3:08 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 67 min |
| Sep 1, 4:15 PM PDT | Flash Flood Warning | VEF | San Bernardino | 60 min |
| Sep 1, 4:15 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 60 min |
Nearby
Severe Thunderstorm Warnings in California, 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; radar from the NEXRAD Level II archive.