A woman suffered heat stroke in Death Valley.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
A woman suffered heat stroke in Death Valley.
The local office's own words before the first event, 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 the first event at Jul 7, 8:27 AM PST, 2 hours 33 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 927 AM PDT Fri Jul 7 2017 .SYNOPSIS...High pressure over the region will produce excessive heat through Saturday. Monsoon moisture will slowly spread over the area followed by a more substantial increase Sunday, bringing greater thunderstorm chances along with cooler temperatures and higher humidity. && .UPDATE...Tweaked PoP and sky grids up just a little more this afternoon and evening through much of Clark County and down the Colorado River. Radar continues to show light returns in this area, most likely corresponding to virga. Analysis shows modest CAPE in this area, and higher resolution models suggest that it will remain there through the afternoon into the evening. No other changes at this time. && .PREV DISCUSSION... 510 AM PDT Fri Jul 7 2017 .UPDATE...Touched up PoP grids this morning and today to account for latest high-res model and radar trends. Area of at least shallow convection is expanding/enhancing from about Sentinel, AZ, arcing up towards Primm, NV, and even week returns further arcing north of Las Vegas through southeast Lincoln county, NV. The latest HRRR runs keep this activity going through 18Z as it rotates around the high. While not much is expected out of this, some a few in-cloud lightning flashes have been observed this morning near Needles, CA. Added at least slight chances of thunderstorms south of Vegas through the morning. -Steele- .SHORT TERM...through Sunday night. The focus for the short term continues to be heat and monsoonal moisture. Moisture has been seeping into the area as forecast, with PWATs increasing over the last 48 hours. Thus far, it has been enough to spark a few thundershowers over the mountains. The building upper-level high has indeed done a number to suppress activity, with no major complexes in Arizona or northern Mexico, a change from the previous few days. However, there is abundant cloud cover and shallow convection still occurring underneath the high. This brings a few challenges. Will the cloud cover limit heating? Will the near record temperatures be enough to overcome inhibition and spark thunderstorms on the higher terrain? Have taken a middle of the road approach, keeping the excessive heat along with slight chances of mountain thunderstorms once again pretty much through the period. Of note early this morning is a small/subtle circulation near Flagstaff, AZ. It does not appear to be producing much but cloud cover now, however it should arrive in our CWA later this afternoon if it holds together, which could be the straw that breaks the camel's back and may help to initiate a thundershower or two, especially over the Hualapai, McCullough, and/or Spring Mountains. With most moisture concentrated at the mid and upper levels still, would expect any activity that does develop to be capable of gusty winds. There is a possibility of outflow or other moisture surge to begin working northwestward Saturday morning, however, confidence is fairly low for any activity on Saturday. A more substantial increase in monsoonal moisture is still expected by Sunday as high pressure begins to relax, with decreasing temperatures and increasing thunderstorm chances. .LONG TERM...Monday through Thursday. A somewhat moist south/southeast flow will continue Monday with most of the forecast area having at least a slight chance of thunderstorms. The models are still suggesting slight drying beginning in the far western portion of the forecast area so lower elevations of western San Bernardino and Inyo County will have minimal chances of thunderstorms. The best chances look to be over Mohave County where the deeper moisture and best instability is forecast. Temperatures Monday look to be pretty close to normal. A more southwesterly flow is forecast to gradually push drier air into the forecast area Tuesday through Thursday and by Thursday we are limiting the mention of thunderstorms to only eastern Mohave County and the Sierra crest. As a result of the somewhat drier air, temperatures will creep up a couple of degrees by Thursday. .AVIATION...For McCarran...Winds are once again expected to remain on the light side, following typical diurnal trends. East winds should dominate by late morning, but confidence falls in the afternoon with mountain thunderstorms possible. If they do develop, outflow could enter portions of the valley. Otherwise, the valley should remain dry with SCT to possibly BKN clouds around 20 kft and hot temperatures continuing to push density altitude up to around 6000 ft. For the rest of southern Nevada...northwest Arizona...and southeast California...Light diurnal winds following typical summertime trends expected to persist today for most terminals. Thunderstorms are possible on the mountain ranges, especially the Sierra Nevada, Spring Mountains, and McCullough Rang, and any activity that does develop will likely produce at least locally gusty winds. .SPOTTER INFORMATION STATEMENT..Strengthening high pressure is expected to keep monsoon activity at bay through the end of the week, therefore, spotter activation is not anticipated. However, spotters are encouraged to report any significant weather or impacts according to standard operating procedures. .FIRE WEATHER...Very hot temperatures are expected to continue through Saturday. Moisture has increased enough for a chance of thunderstorms, mainly over the Sierra, Spring Mountains and Mojave Preserve. There is potential for wetting rain with these storms. Most areas will have a chance of thunderstorms Sunday and Monday as a south to southeast flow brings in a little more moisture. Temperatures will drop a little bit as well. Dry air will then gradually push in from west to east Tuesday through Thursday. .HYDROLOGY...Ongoing minor flooding may continue in the eastern Sierra as temperatures remain high. Afternoon thunderstorms over the mountains may aid snowmelt runoff to keep some drainages elevated over the next few days. Remember, never drive through flooded roadways or around barricades. Also, pastureland or farmland adjacent to creeks, streams or rivers could experience areas of standing water. .CLIMATE...Temperatures will once again soar across the region, approaching record highs for the date. Records for Friday, July 7, 2017 Location Forecast High Record High (year) ----------------------------------------------------- Las Vegas, NV 114 114 (1989) Kingman, AZ 109 109 (1905) Barstow-Daggett, CA 113 116 (1989) Bishop, CA 102 106 (1989) Death Valley, CA 126 127 (1989) && Update..................................Morgan Short Term/Aviation/Hydrology/Climate...Steele Long Term/Fire..........................Harrison For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The national radar mosaic for the moment the first event began.
1 heat. Local standard time, as filed.
A tourist in Death Valley suffered heat stroke. She was released from the hospital after one day.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2017Every state in 2017This day in weather historyWarnings in California, July 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 707951.