Marine Weather and Tide Forecast for Vansant, VA

KEY MESSAGES
1.) Near to record heat will persist through Saturday.

2.) Increased fire danger is expected through the rest of the work week. Dry dead fuels and relatively low humidity will be joined by wind gusts 20-30 mph on Thursday.

3.) A few strong thunderstorms are possible Thursday afternoon, mainly across southeast Ohio and the middle Ohio Valley. High uncertainty as to how far east any threat will carry.

4.) A sharp cold front Saturday night will end the heat wave, bringing a period of beneficial rain and much colder temperatures for Sunday and Monday. Conditional threat for strong to severe storms Saturday.

DISCUSSION
KEY MESSAGE 1...

An anomalous mid-level ridge remains anchored from the central Gulf to Florida, keeping the region in a deep southwesterly flow regime. Across the lowlands, expect highs generally in the 80s with a few sites approaching or exceeding record values today.
While a weak shortwave on Thursday will introduce cloud cover and keep highs in the low to mid 80s, the ridge rebuilds Friday.
Saturday looks to be the pinnacle of this heat wave for the Metro Valley and southern coalfields. Deterministic guidance is currently near record levels, but 90th percentile statistical data suggests isolated 90F readings are possible if precipitation struggles to invade a very dry antecedent airmass.

KEY MESSAGE 2...

Fire weather concerns remain at the forefront through Friday.
Despite the rapid green-up of live fuels in the lowlands, 10-hour fuel moistures at RAWS sites are critically low, ranging from 7 to 9 percent. This afternoon and Friday will see minimum relative humidity values bottoming out between 30 and 35 percent with relatively light winds. However, Thursday presents a more significant challenge. As a shortwave moves through the Ohio Valley, the pressure gradient tightens. Expect southwesterly sustained winds of 10-15 mph with gusts of 20-30 mph. Even with RH values slightly higher (upper 30s) due to moisture advection, the combination of wind and dry dead fuels may necessitate an Increased Fire Danger Statement for at least parts of the region.

KEY MESSAGE 3...

A shortwave trough tracking from the Mississippi Valley will bring the next chance for convection Thursday afternoon.
However, a significant dry sub-cloud layer remains between the surface and H500, which will likely limit overall precipitation coverage and result in high-based cells as they progress eastward. Low-level lapse rates remain steep, and with DCAPE potential over 800 J/kg, any sustained updraft will pose a risk for marginally severe downburst winds. The best potential remains focused across southeast Ohio and the middle Ohio Valley where forcing is strongest and storms will encounter the least amount of dry air.

KEY MESSAGE 4...

A significant pattern shift is confirmed for the weekend. A deep longwave trough will eject from the Plains, driving a strong surface cold front through the area late Saturday night into Sunday. Synoptic lift is much more robust with this system compared to previous waves. While timing will dictate the exact severe threat, current kinematics with 0-6km bulk wind difference of 45 KTs support organized storm modes should sufficient instability emerge.

This system appears to be the most likely candidate for a wetting rain. Strong cold advection follows the frontal passage.
H85 temperatures are forecast to drop from +15C on Saturday to -5C by Sunday night. This will result in high temperatures retreating to the 50s and 60s for Sunday and Monday. Under clear skies and diminishing winds Sunday night and Monday night, areas subject to cold air drainage away could see frost.

AVIATION /18Z WEDNESDAY THROUGH MONDAY/
VFR conditions will prevail across all terminals for the next 24 hours. Scattered cumulus with bases around 5000 ft AGL will dissipate after sunset. Southwest winds at 8-12KTs with occasional gusts to 20KTs will diminish to 5KTs or less overnight.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z THURSDAY...

FORECAST CONFIDENCE: High.

ALTERNATE SCENARIOS: None.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY OF WFO FORECAST TO AVAILABLE MODEL INFORMATION: H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

UTC 1HRLY 16 17 18 19 20 21 22 23 00 01 02 03 EDT 1HRLY 12 13 14 15 16 17 18 19 20 21 22 23 CRW CONSISTENCY H H H H H H H H H H H H HTS CONSISTENCY H H H H H H H H H H H H BKW CONSISTENCY H H H H H H H H H H H H EKN CONSISTENCY H H H H H H H H H H H H PKB CONSISTENCY H H H H H H H H H H H H CKB CONSISTENCY H H H H H H H H H H H H

AFTER 18Z THURSDAY...
Brief periods of MVFR to IFR restrictions are possible within isolated showers and thunderstorms, with a higher likelihood of MVFR to IFR restrictions Thursday night and late Saturday through Saturday night.

CLIMATE

Forecast / Record High Temperatures ------------------------------------------------------- Wed, 4/15 | Thu, 4/16 | Fri, 4/17 | ------------------------------------------------------- CRW | 88 / 89 (1994) | 85 / 89 (2002) | 83 / 89 (1976) | HTS | 89 / 87 (2024) | 83 / 89 (2024) | 84 / 87 (1976) | CKB | 86 / 83 (1974) | 83 / 86 (2002) | 78 / 88 (1969) | PKB | 87 / 84 (2024) | 83 / 88 (2002) | 81 / 89 (1976) | BKW | 83 / 82 (2012) | 79 / 84 (2002) | 77 / 84 (1976) | EKN | 85 / 81 (2012) | 81 / 85 (2012) | 76 / 87 (1976) | -------------------------------------------------------

RLX WATCHES/WARNINGS/ADVISORIES
WV...None.
OH...None.
KY...None.
VA...None.