Scattered showers and thunderstorms developed on the afternoon of July 4th across eastern West Virginia. One to two inches of rain caused isolated flooding in Hampshire County.
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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 LWX wrote it up.
Scattered showers and thunderstorms developed on the afternoon of July 4th across eastern West Virginia. One to two inches of rain caused isolated flooding in Hampshire County.
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 Baltimore/Washington wrote its last area forecast discussion before the first event at Jul 4, 3:03 AM EST, 5 hours 29 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 403 AM EDT Wed Jul 4 2018 .SYNOPSIS... High pressure will remain positioned over the western Atlantic through Thursday. A cold front will approach from the Great Lakes region on Friday, then move south of the Mid-Atlantic over the weekend as high pressure builds in. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Sprawling upper ridge remains in place this morning across the region, while surface ridging exists from the northeastern US eastward into the western Atlantic. Light easterly flow is evident in the low to mid levels, and is expected to persist through the day today. This easterly flow will bring a slightly less hot and humid day to the region today, with highs topping out from the upper 80s to low 90s. Dew points will range from the low to mid 70s, and this combination will result in heat indicies in the 90s to around 100F, still hot/humid, but not as oppressive as in recent days. In addition, this air mass will be less unstable from the DC/Baltimore metro areas south/east due to drop in heat/humidity and capping inversion, while greater instability and low level convergence exists with slightly higher dew points and no cap to the north/west. Thus, while an isolated shower/thunderstorm remains possible along the I-95 corridor, the majority of any scattered shower/thunderstorm development should be located from the near the Blue Ridge/Catoctins on north and west. Similar to yesterday, while widespread severe threat does not exist, as with any summer convection with large amounts of CAPE, a stronger storm or two is possible. In addition, with lack of flow, heavy rain and an isolated flood risk exists as well. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/... Any showers/thunderstorms will weaken and dissipate this evening and tonight. With light east to southeasterly flow and abundant low level moisture, potential exists for patchy fog and possibly some low stratus. Lows in the 70s to locally near 80F in the urban centers. East/southeast flow will turn more southerly on Thursday. Temperatures/dew points will be similar to today but may tick up a degree or two, with highs from 88-93F and heat indices in the upper 90s to around 100F. Isolated to scattered showers/thunderstorms are possible again, with the highest chances west of the Blue Ridge. A cold front will then approach from the Great Lakes Thursday night, with low level flow turning south/southwest. Lows in the 70s. The cold front will cross the region on Friday bringing widespread shower/thunderstorm activity to the area. There will be an increased risk for heavy rain and localized flooding with high precipitable water values (in excess of 2"), warm rain processes, relatively weak steering flow, and tall/skinny CAPE profiles. The saving grace may be that the frontal passage should be fairly progressive. There may also be a limited to marginal severe threat given moderate instability and surface cold front, but lack of shear should preclude a greater threat. Highs on Friday will reach the 80s to near 90F. Convection will wane Friday night. && .LONG TERM /SATURDAY THROUGH TUESDAY/... Models in good agreement regarding Canadian high pressure dominating the weather Saturday through Tuesday. Cool air mass (compared to recent days) will flood the region, and temperatures and humidity will both likely end up below normal Saturday and Sunday. Winds will be a bit breezy on Saturday, but should diminish Sunday as the high builds more directly overhead and the gradient weakens. As winds turn more southerly on Monday and Tuesday while high pressure shifts to our south, temps and humidity should start creeping back up, but should not venture beyond norms for this time of year. The high's presence should keep chances of precipitation minimal if not zero through the long term. && .AVIATION /08Z WEDNESDAY THROUGH SUNDAY/... Predominantly VFR is expected through the day today, although brief patchy fog/br is possible early this morning with MVFR/localized IFR. Highest chance exists at MRB. Isolated to scattered showers/thunderstorms are also possible this afternoon/evening, although most TAF sites should remain dry. MRB will see the highest risk of rain/thunder and any restrictions. For tonight, additional patchy fog is possible, as well as the potential for some low stratus. Areas of MVFR/localized IFR are possible later tonight into Thursday morning. Isolated showers/thunderstorms become possible by Thursday afternoon again. More widespread shower/thunderstorm activity is expected for Friday as a cold front crosses the region. Periods of Sub-VFR conditions are possible. VFR conditions expected under high pressure Saturday and Sunday. && .MARINE... Sub-SCA conditions are expected through Thursday. East/southeasterly flow expected today and tonight, turning southerly Thursday, but wind gusts should remain around 15 knots or less. Winds may increase near SCA criteria Thursday night into Friday ahead of an approaching cold front, as well as behind the front late Friday and Friday night. Showers/thunderstorms are expected Friday into Friday night with the cold front, and Special Marine Warnings may be necessary. High pressure building south behind the front will likely result in wind gusts into the 20 knot range, so SCA looks possible if not probable. As high pressure continues building overhead Sunday, the gradient should relax and winds will likely diminish below SCA levels. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...MM NEAR TERM...MM SHORT TERM...MM LONG TERM...RCM AVIATION...MM/RCM MARINE...MM/RCM
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 738 AM EDT Wed Jul 4 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-051030- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Key Bridge to Indian Head MD- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Patapsco River including Baltimore Harbor- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford- Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 738 AM EDT Wed Jul 4 2018 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and adjacent counties in central Maryland and northern Virginia as well as the District of Columbia. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-051030- Washington-Frederick MD-Carroll-Northern Baltimore- Extreme Western Allegany-Central and Eastern Allegany- Northwest Montgomery-Central and Southeast Montgomery- Northwest Howard-Central and Southeast Howard-Northwest Harford- Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke- Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Highland- Eastern Highland-Western Loudoun-Eastern Loudoun- Northern Virginia Blue Ridge-Central Virginia Blue Ridge- Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant- Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 738 AM EDT Wed Jul 4 2018 This Hazardous Weather Outlook is for eastern West Virginia, northern and central Virginia, and central and western Maryland with the exception of Garrett County. .DAY ONE...Today and Tonight Scattered showers and thunderstorms may produce isolated instances of flooding, damaging wind gusts or hail this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Six to eight inches of flowing water over Slanesville Pike near Spring Gap Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2018Every state in 2018This day in weather historyWarnings in West Virginia, July 2018
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: 769533.