Excessive heat returned to the Champlain Valley on what has already been a very warm early summer. These temperatures combined with high dewpoints in the upper 60s to lower 70s created heat index values in the mid 90s to around 100 degrees on July 9th and 10th.
Every event with a place to put it; 5 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 BTV wrote it up.
Excessive heat returned to the Champlain Valley on what has already been a very warm early summer. High temperatures surpassed the upper 80s from July 7-10th with a daily high of 95 degrees on July 9th and 10th.These temperatures combined with high dewpoints in the upper 60s to lower 70s created heat index values in the mid 90s to around 100 degrees on July 9th and 10th.
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 Burlington, VT wrote its last area forecast discussion before the first event at Jul 7, 6:49 AM EST, 1 hour 11 minutes earlier.
Area Forecast Discussion National Weather Service Burlington VT 749 AM EDT Tue Jul 7 2020 .SYNOPSIS... A mid-level ridge of high pressure will bring mostly sunny conditions to the North Country today, with just a chance of an afternoon thunderstorm, mainly across the northern Adirondacks. An approaching mid-level trough will bring a higher potential for showers and thunderstorms on Wednesday, and a few severe thunderstorms are possible. Otherwise, heat and humidity will gradually build through the remainder of this week, with valley high temperatures and heat index values in the low to mid 90s for the Thursday through Saturday period. && .NEAR TERM /THROUGH WEDNESDAY/... As of 745 AM EDT Tuesday...Forecast remains on track. Areas of stratus east of the Greens are expected to mix out by 14-15Z with daytime PBL heating. Otherwise, looking at scattered upper level clouds today as cirrus cascade across the North Country in anticyclonically curved flow aloft. Building mid-level heights and anticyclonically curved flow will limit overall thunderstorm potential today. However, both the 06Z HRRR and 00Z NAM3km indicate isolated thunderstorm development during the peak heating hours this afternoon, mostly across the northern Adirondacks. SBCAPE values up to 1000 J/kg are forecast, but it appears that CIN in the valleys and absence of large-scale forcing will limit convective threat elsewhere. Will need to watch for interactions of the lake breeze and orographic forcing near the eastern slopes of the Adirondacks for possible focus for storms as the afternoon progresses (e.g., Clinton County). May see brief heavy rainfall with any t-storms that do form this afternoon. Looking at 850mb temps about 1C warmer than yesterday, so generally looking at high temperatures in the low- mid 80s eastern VT, upper 80s in the Champlain Valley, and low 90s in the St. Lawrence Valley. Southerly gradient will will be somewhat stronger today, with gusts to 25kts near Lake Champlain. A Lake Wind Advisory is posted for the afternoon hours. A 700mb shortwave trough approaching from sern Ontario brings potential for scattered showers and a few embedded rumbles of thunder during the overnight hours. Appears large-scale forcing and daytime heating will combine for a somewhat better potential severe t-storm threat on Wednesday, especially across VT given timing of trough axis. Included mention of gusty winds/small hail and a few severe storms can't be ruled out. Overall, looking at better surface-based instability (1500-2000 J/kg) and sfc-6km shear (30-35kt) during Wednesday afternoon to support longer-lived updrafts and better convective organization. Only negative factor may be that best forcing progresses east of the CT River Valley prior to peak heating on Wednesday, limiting severe threat. Have included a mention of severe threat in the morning Hazardous Weather Outlook, and we'll continue to monitor the timing. High temperatures on Wednesday should again reach the mid 80s ern VT, upper 80s in the Champlain Valley, and lower 90s across the St. Lawrence Valley. We'll see somewhat muggy conditions as well, with 2-m dewpoints climbing into the 64-68F range. && .SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/... As of 329 AM EDT Tuesday...The frontal boundary associated with precipitation early Wednesday will continue to move south and east of the North Country. A few lingering showers will be possible across eastern VT through the early overnight hours. Low level moisture and clouds will linger overnight with areas of patchy fog likely across eastern VT and the hollows of the Adirondacks (especially any locations that receive measurable precipitation during the day). Heights begin to build Thursday morning with the first of several 90+ degree days on tap. 925mb temperatures climb to around ~24-25 C, therefore despite the likelihood of clouds around expect temperatures to warm into the low to mid 90s. Humidity levels also increase with dewpoints in the mid to upper 60s. We'll likely need heat headlines for Thursday as heat indices across the broader valleys remain at or above 95 degrees for several hours during the afternoon hours. && .LONG TERM /FRIDAY THROUGH MONDAY/... As of 329 AM EDT Tuesday...Continued heat for Friday into Saturday with temperatures in the upper 80s to low 90s with increasing humidity levels as tropical moisture is advected northward. In addition to this humidity, precipitation chances increase as well heading into the weekend. Jury is still out on whether we will see any appreciable precipitation from the tropical system (if we do, best chances will likely be across eastern VT), but a shortwave exiting the Great Lakes region will interact with this available tropical moisture which will spark off some morning showers/afternoon thunderstorms across the region. Behind this system, "cooler" weather is expected for Sunday-Tuesday with highs in the low to mid 80s. Overnight lows will stay above average through the period in the mid 60s to around 70. && .AVIATION /12Z TUESDAY THROUGH SATURDAY/... Through 12Z Wednesday...VFR conditions through 04Z tonight with FEW-SCT200-250 this morning, and scattered cumulus development this afternoon, especially over the higher terrain. May see isold -TSRA development across the Adirondacks between 18-22Z. Carried VCSH attm at KSLK, but a brief interval of MVFR/IFR conditions can't be ruled out at KSLK. At KBTV, southerly winds will pick up during the daylight hours, with gusts near 20kts 15-22Z. Late tonight, it appears MVFR stratus will redevelop, and may see localized IFR stratus at MPV. Approaching shortwave trough may result in scattered showers toward daybreak. Carried -SHRA at KMSS after 09Z where best chances for showers exist. Outlook... Wednesday: Mainly VFR, with local MVFR possible. Chance SHRA, Chance TSRA. Wednesday Night: VFR. Chance SHRA, Slight chance TSRA. Thursday: VFR. Slight chance SHRA, Slight chance TSRA. Thursday Night: VFR. NO SIG WX. Friday: VFR. Chance SHRA, Slight chance TSRA. Friday Night: Mainly VFR, with areas MVFR possible. Chance SHRA, Slight chance TSRA. Saturday: Mainly MVFR, with areas IFR possible. Likely RA, Chance SHRA, Chance TSRA. && .MARINE... With increasing pressure gradient, southerly winds will increase to 15 to 25 knots by early this afternoon across Lake Champlain. Should see waves 2 to 3 feet across the northern end of the broad lake. A Lake Wind Advisory is posted for the afternoon hours. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...None. NY...None. && SYNOPSIS...Banacos NEAR TERM...Banacos SHORT TERM...LaRocca LONG TERM...LaRocca AVIATION...Banacos MARINE...Team BTV
Hazardous Weather Outlook National Weather Service Burlington VT 303 AM EDT Tue Jul 7 2020 NYZ029>031-034-080715- Southeastern St. Lawrence-Southern Franklin-Western Clinton- Western Essex- 303 AM EDT Tue Jul 7 2020 This Hazardous Weather Outlook is for northern New York. .DAY ONE...Today and tonight. Isolated thunderstorms are possible this afternoon across the northern Adirondacks. Brief heavy rainfall and dangerous cloud to ground lightning are expected to be the primary threats. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Additional thunderstorms are possible during the day Wednesday. A few stronger storms are possible. Also, temperatures in the low to mid 90s are possible Thursday through Saturday, and may result in heat related health concerns. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NYZ026>028-035-087-VTZ001>012-016>019-080715- Northern St. Lawrence-Northern Franklin-Eastern Clinton- Eastern Essex-Southwestern St. Lawrence-Grand Isle-Western Franklin- Orleans-Essex-Western Chittenden-Lamoille-Caledonia-Washington- Western Addison-Orange-Western Rutland-Windsor-Eastern Franklin- Eastern Chittenden-Eastern Addison-Eastern Rutland- 303 AM EDT Tue Jul 7 2020 This Hazardous Weather Outlook is for northern New York, central Vermont, northeast Vermont, northwest Vermont and southern Vermont. .DAY ONE...Today and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered thunderstorms are expected during the day Wednesday. From the Champlain Valley eastward, a few severe thunderstorms are possible, producing localized strong winds and hail. Heat and humidity will also be on the increase later this week. Temperatures and heat index values in the low to mid 90s are expected Thursday through Saturday, and may result in heat related health concerns. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
5 heat. Local standard time, as filed.
High temperatures in the upper 80s to lower 90s with dew points in the 60s to lower 70s created heat index values in the mid to upper 90s.
High temperatures in the upper 80s to lower 90s with dew points in the 60s to lower 70s created heat index values in the mid to upper 90s.
High temperatures in the upper 80s to lower 90s with dew points in the 60s to lower 70s created heat index values in the mid to upper 90s.
High temperatures in the upper 80s to lower 90s with dew points in the 60s to lower 70s created heat index values in the mid 90s to around 100 degrees.
High temperatures in the upper 80s to lower 90s with dew points in the 60s to lower 70s created heat index values in the mid 90s to around 100 degrees.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Vermont in 2020Every state in 2020This day in weather historyWarnings in Vermont, July 2020
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: 892489, 892490, 892491, 892492, 892493.