⬛ Bottom Line — Dominant Risk

ORD convective disruption + aircraft rotation propagation is the primary threat tonight. ORD sustained a ground stop Monday AM (May 18) and tonight carries a 50% precip chance with thunderstorms possible late evening. UA5610 — the highest-risk flight with a 33% OTP trend worsening — departed ORD at 17:50 CDT and is directly exposed. The temporary UA5673 overnight ORD→CHO service (operating through approx. May 20) faces maximum ORD convective exposure. ATL carries a secondary watch: FAA advisory flagged ATL GS possible after 19:00 EDT, threatening the DL5473 last bank arrival at 22:41. CHO local weather is excellent all evening — near-record 97°F day, clearing overnight, VFR through 01:00. IAD is clean. All risk tonight is hub-driven.

Highest-Risk Flight
UA5610 ORD→CHO
ORD Delay Probability
65–75% tonight
ATL Delay Risk
30–40% evening
LGA Delay Risk
10–15%
CHO Local Wx
VFR / Clear
IAD Status
Very Low Delay
Late Arrival Window
22:00 – 01:30
Hub & Station Weather
CHO — Charlottesville
High 97°F (near-record). Clear tonight. Low ~69°F. Light S winds. VFR. Zero wx impact on operations.
ORD — Chicago O'Hare
GS issued Mon AM — lifted. Tonight: 50% precip, tstm possible late evening. S winds 15–20kt gusting 30kt. RWY 09L EGPWS alert (thru Jul 17). GDP/GS risk active.
ATL — Hartsfield-Jackson
High 89°F, mostly sunny. 30% tstm after 14:00. FAA advisory: ATL GS possible after 19:00 EDT. Evening clearing expected but late-bank exposure real.
LGA — LaGuardia
Mostly cloudy. S 8kt. 10SM. Low 52°F overnight. No active delays or GDP. Operationally quiet tonight.
IAD — Dulles
Very low delay status. Few clouds. 10SM. ESE 5kt. Clean ops across all UA regional turns.
Flight Operations — 16:00–01:00 EDT — Ordered by Published Time
Status Type Published
Time		 Originally
Scheduled		 Analyst
Est.		 Flight Wx / Ops Picture T-Storm
Routing		 Hub
Cong.		 Delay
Risk		 Ramp Note
On Time ARR 16:55 16:55 17:00+5 min DL5266
ATL → CHO 		ATL mostly sunny, 10SM, calm early PM winds. Afternoon tstm risk below convective window for this departure. CRJ-900 / Endeavor. 81% OTP on route. None 2/5 20% Turn aircraft for DL5423 dep 17:28. Confirm on-stand time to protect the turn. 33-min window.
Watch ARR 17:14 17:14 17:35+21 min UA5565
ORD → CHO 		Dep ORD 14:04 CDT. ORD residual congestion from Mon AM GS. 48% delayed on route; 0% OTP last 14 days per Qsensor. Avg delay +90 min. CRJ-700 / SkyWest. Low 3/5 50% Rotation risk. Turn for UA5606 dep 17:37 — only 23 min buffer. Stage crew pre-arrival.
Watch DEP 17:28 17:28 17:35+7 min DL5423
CHO → ATL 		Turn from DL5266 arr 16:55. CHO wx clean. ATL accepting. 33-min turn window — tight but achievable if DL5266 protects. CRJ / Endeavor. 5/5 OTP historically. None 2/5 20% Cascades directly off DL5266 arrival. Highly reliable if turn protected. Gate clear confirmed.
Watch DEP 17:37 17:37 17:55+18 min UA5606
CHO → ORD 		Rotation off UA5565 arr 17:14. 23-min turn window. CHO wx VFR/clear. ORD accepting now; evening GDP risk builds. CRJ-550 / SkyWest. 73% OTP hist. None 3/5 40% Rotation risk. If UA5565 arrives after 17:25, push slips. EDCT possible if ORD GDP fires. Crew must be staged pre-arrival.
On Time DEP 19:13 19:13 19:18+5 min DL5473
CHO → LGA 		LGA VFR, S 8kt, no active GDP. CHO wx clear. ZNY L453/455 closures minor routing impact only. CRJ-900 / Endeavor. Lowest-risk departure of the night. None 2/5 15% Standard staffing. Confirm gate clear from DL5423 return. Light evening LGA queue.
On Time ARR 19:25 19:25 19:30+5 min UA4840
IAD → CHO 		IAD very low delay status. Clear wx, ESE 5kt, 10SM. ERJ regional. 7% delay rate. 59-min flight. ZDC NRP negligible impact on short hop. None 1/5 10% Cleanest inbound of the evening. Quick unload. Turn likely back to IAD shortly after.
At Risk ARR 20:55 ⚠ CXL'd 5/18 20:55 22:00+65 min UA5610
ORD → CHO 		HIGHEST-RISK FLIGHT. Dep ORD 17:50 CDT. Canceled May 18 — fresh ORD rotation tonight, no CHO pre-position. ORD evening convective risk (50% precip, tstm late), EGPWS RWY 09L, GDP history. 33% OTP, worsening trend. Moderate 4/5 70% Plan for 22:00+ arrival. Aircraft RONs CHO. Full late-crew staffing required. Confirm mx flag status from ORD. No rotation dependency from CHO-end.
Minor Delay ARR 22:41 22:41 23:10+29 min DL5473
ATL → CHO 		Last ATL bank. Dep ATL 21:30 EDT. ATL tstm risk 30–40% evening — FAA advisory: ATL GS possible after 19:00. CRJ-900 / Endeavor. 77% OTP on route. Moderate 3/5 40% Last DL ATL bank. RON aircraft. Monitor ATL 19:00–21:00 wx. Arrival after midnight possible if ATL convection fires.
Minor Delay ARR 22:45 22:45 23:05+20 min DL5320
LGA → CHO 		LGA VFR, no active GDP, S 8kt, 10SM. Last LGA bank. Dep LGA ~21:12 EDT. Low wx impact. Primary risk is mid-evening LGA volume compression. 10% delay rate hist. None 2/5 25% RON aircraft. Near-concurrent arrival with DL5473 ATL — coordinate gate and baggage carousel sequencing. Two-aircraft window ~23:00–23:15.
On Time ARR 23:43 23:43 23:50+7 min UA4265
IAD → CHO 		Last IAD bank. Dep IAD 22:40. IAD clean ops, very low delay status. ERJ regional. 7% delay rate. 55-min flight. ZDC NRP negligible on this hop. None 1/5 10% Last IAD arrival of the night. RON aircraft. Light load. Shift can begin close-out after this lands if UA5610 and overnight ORD temp have cleared.
High Risk ARR ~23:30 Confirm ops ~23:30 00:45+~+75 min UA5673 ✶
ORD → CHO 		TEMPORARY SERVICE — may be final night (ops through ~May 20). Dep ORD late evening. Maximum ORD convective exposure window. If ORD GDP active post-20:00 CDT, this departure is last released. No OTP baseline available. High 5/5 75% ✶ Confirm operating tonight. Late-crew authorization past 01:00 required. Gate ready, ramp lighting, baggage standby. ORD GDP at 21:00+ CDT → expect 01:00–01:30 CHO arrival.
Predictive Analysis & Shift Warnings
ORD Rotation Cascade Risk

If ORD evening convection triggers a GDP after 19:00 CDT, UA5610 absorbs the delay — pushing CHO arrival to 22:00–23:00. The overnight UA5673 temp service then runs 01:00–01:30. Back-to-back late arrivals stress late-night staffing. This is the single most likely adverse scenario tonight.

ATL Evening Convective Watch

FAA ATCSCC flagged ATL GS possible after 19:00 EDT. If afternoon tstms don't clear ATL by 18:00, the DL5473 (ATL dep 21:30) aircraft faces rotation risk. ATL typically recovers within 60–90 min of tstm passage — monitor 19:00–21:00 ATL conditions closely. Midnight-plus arrival possible.

Compressed Late Arrival Window

Between ~22:30 and 01:30 CHO ramp may see up to four arrivals nearly simultaneously: DL5320 LGA, DL5473 ATL last bank, UA5610 ORD, and UA5673 overnight temp service. Gate sequencing and baggage carousel management will be critical. Plan coordinated unload sequence.

Overnight Temp Service — Confirm Status

UA5673 ORD→CHO is scheduled through approximately May 20 — tonight may be its final operation. Confirm with station manager whether this service is listed as operating on May 19/20. If operating during ORD convective recovery, this departure is extremely vulnerable to GDP hold.

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Extreme Heat Advisory — CHO Ramp

CHO hit a near-record high of 97°F today (record 95°F set in 1911). Ramp personnel coming off a full heat-stress day. Hydration discipline, buddy checks, and awareness of heat illness symptoms are mandatory throughout the shift. Asphalt surface temp may be 130–145°F through early evening. Ground equipment brake-fade risk elevated — exercise normal caution on vehicle ops near aircraft.