Heat and humidity through the day on June 29th led to a moderately unstable air mass by the afternoon. A weak pressure trough developed and heights began to fall by the evening as an upper level ridge broke down. Also late in the evening, a cold front began to approach, increasing forcing across the region. Several rounds of scattered showers and thunderstorms developed from the mid afternoon hours through well past sunset. Some thunderstorms produced gusty winds over the waters.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-19 13:26:00 to 29-JUN-19 13:31:00 (EST-5)
Location: POTOMAC LIGHT 33 (LT3)
Magnitude: 40.00 MG
Reported by: Buoy

Wind gusts of up to 40 knots were observed.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-19 13:31:00 to 29-JUN-19 13:31:00 (EST-5)
Location: BABER POINT (BAB)
Magnitude: 34.00 MG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-19 13:36:00 to 29-JUN-19 13:41:00 (EST-5)
Location: CUCKOLD CREEK (CCK)
Magnitude: 35.00 MG
Reported by: Buoy

Wind gusts of up to 35 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-19 14:12:00 to 29-JUN-19 14:12:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 51.00 MG
Reported by: Buoy

Wind gusts of up to 51 knots were observed.

Marine Hail in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-19 14:39:00 to 29-JUN-19 14:39:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 15:28:00 to 29-JUN-19 15:28:00 (EST-5)
Location: GREENBURY POINT (GBY)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-19 14:38:00 to 29-JUN-19 14:38:00 (EST-5)
Location: PATUXENT RIVER ASOS (KNHK)
Magnitude: 35.00 MG
Reported by: Buoy

Wind gusts of up to 35 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-19 15:10:00 to 29-JUN-19 15:10:00 (EST-5)
Location: (KMTN)MARTIN STATE AIRPORT
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-19 15:20:00 to 29-JUN-19 15:30:00 (EST-5)
Location: HART MILLER ISLAND (HRT)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots were observed.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-19 15:24:00 to 29-JUN-19 15:24:00 (EST-5)
Location: BALTIMORE (BLTM2)
Magnitude: 34.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-19 15:36:00 to 29-JUN-19 15:36:00 (EST-5)
Location: TOLCHESTER MD (TCBM2)
Magnitude: 34.00 MG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-19 15:36:00 to 29-JUN-19 15:36:00 (EST-5)
Location: BALTIMORE KEY BRIDGE (FSKM2)
Magnitude: 46.00 MG
Reported by: Buoy

Wind gusts of up to 46 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 15:50:00 to 29-JUN-19 15:50:00 (EST-5)
Location: BAYSIDE ES (STVVL)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 16:05:00 to 29-JUN-19 16:05:00 (EST-5)
Location: BAYSIDE ES (STVVL)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 16:25:00 to 29-JUN-19 16:25:00 (EST-5)
Location: TOLLY POINT (TOL)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-19 21:50:00 to 29-JUN-19 21:50:00 (EST-5)
Location: MARYLAND SCIENCE CENTER (BLMRE)
Magnitude: 41.00 MG
Reported by: Buoy

Wind gusts of up to 41 knots were observed.

Marine Hail in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-19 22:47:00 to 29-JUN-19 22:47:00 (EST-5)
Location: SPARROWS POINT HS (BTMDL)
Magnitude: 1.75 
Reported by: Trained Spotter

Hail up to 1.75 inches in diameter was observed.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 29-JUN-19 22:01:00 to 29-JUN-19 22:01:00 (EST-5)
Location: SMITH ISLAND (SIS)
Magnitude: 38.00 MG
Reported by: Buoy

Wind gusts of up to 38 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 16:32:00 to 29-JUN-19 16:32:00 (EST-5)
Location: SHADY SIDE ES (SHADY)
Magnitude: 37.00 MG
Reported by: Buoy

Wind gusts of up to 37 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-19 16:46:00 to 29-JUN-19 16:56:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots were observed.

Marine Thunderstorm Wind in EASTERN BAY, ATLANTIC NORTH
From 29-JUN-19 16:46:00 to 29-JUN-19 16:46:00 (EST-5)
Location: US-50 (MD040)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-19 17:00:00 to 29-JUN-19 17:00:00 (EST-5)
Location: THOMAS POINT (TPLM2)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 29-JUN-19 17:25:00 to 29-JUN-19 17:25:00 (EST-5)
Location: CAMBRIDGE (CAMM2)
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts of up to 42 knots were observed.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-19 21:50:00 to 29-JUN-19 21:50:00 (EST-5)
Location: ORIOLE PARK AT CAMDEN YARDS (BLTPC)
Magnitude: 38.00 MG
Reported by: Buoy

Wind gusts of up to 38 knots were observed.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-19 13:24:00 to 29-JUN-19 13:29:00 (EST-5)
Location: POTOMAC LIGHT 33 (LT3)
Magnitude: 40.00 MG
Reported by: Buoy

Wind gusts of up to 40 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-19 14:18:00 to 29-JUN-19 14:42:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 40.00 MG
Reported by: Buoy

Wind gusts of up to 40 knots were observed.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 29-JUN-19 15:33:00 to 29-JUN-19 15:33:00 (EST-5)
Location: GROVE POINT (GVP)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts of up to 34 knots were observed.