George BM

IAD already at 95F with a 67F dewpoint. Here we come.

IAD has already hit 90F.

IAD only got down to 75F this morning. Time to June 2012 it up in here.

IAD has topped out at 97F thus far.

96F at IAD.

IAD at 95/63.

Currently 93/65 at IAD. Hottest temp of the year so far.

Heat Advisory for the entire area tomorrow. URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 1235 PM EDT Fri Jun 21 2024 DCZ001-MDZ003>006-008-011-013-014-016>018-501>508-VAZ027>031- 037>040-050-051-053>057-501-502-505-506-526-527-WVZ050>053-055- 502>504-220045- /O.CON.KLWX.HT.Y.0002.240622T1500Z-240623T0000Z/ District of Columbia-Washington-Frederick MD-Carroll- Northern Baltimore-Cecil-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Extreme Western Allegany- Central and Eastern Allegany-Northwest Montgomery- Central and Southeast Montgomery-Northwest Howard- Central and Southeast Howard-Northwest Harford-Southeast Harford- Shenandoah-Frederick VA-Page-Warren-Clarke-Albemarle-Greene- Madison-Rappahannock-Orange-Culpeper-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George-Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun-Northwest Prince William- Central and Southeast Prince William/Manassas/Manassas Park- Hampshire-Morgan-Berkeley-Jefferson-Hardy-Eastern Grant- Western Mineral-Eastern Mineral- Including the cities of Washington, Hagerstown, Frederick, Ballenger Creek, Eldersburg, Westminster, Reisterstown, Cockeysville, Elkton, Baltimore, Bowie, Suitland-Silver Hill, Clinton, College Park, Greenbelt, Laurel, Camp Springs, Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold, Odenton, St. Charles, Waldorf, Lexington Park, California, Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby, Prince Frederick, Frostburg, Cumberland, Germantown, Damascus, Bethesda, Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City, Jarrettsville, Aberdeen, Strasburg, Woodstock, Mount Jackson, New Market, Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, Charlottesville, Stanardsville, Madison, Orange, Gordonsville, Culpeper, Reston, Herndon, Annandale, Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria, Falls Church, Falmouth, Fredericksburg, Dahlgren, Warrenton, Turnbull, Purcellville, Leesburg, Ashburn, Sterling, Haymarket, Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Romney, Paw Paw, Martinsburg, Charles Town, Shepherdstown, Moorefield, Petersburg, Elk Garden, Antioch, Keyser, New Creek, Ridgeville, Russelldale, Headsville, and Fort Ashby 1235 PM EDT Fri Jun 21 2024 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT SATURDAY... * WHAT...Heat index values up to around 105 to 107 expected, with heat index values generally between 100 and 104 degrees west of the Blue Ridge Mountains. * WHERE...Portions of central, north central, northeast, northern, southern and western Maryland, The District of Columbia, central, northern and northwest Virginia and eastern and panhandle West Virginia. * WHEN...From 11 AM to 8 PM EDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Oppressive heat and humidity will overspread the area Saturday and last into Sunday. Little relief from the heat is expected Saturday night with low temperatures in mid 70s to near 80 for most, which will compound heat stress on those without air conditioning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$

URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 459 PM EDT Thu Jun 20 2024 DCZ001-MDZ004>006-008-011-013-014-016-503>508-VAZ037>040-050-051- 053>057-501-502-505-506-526-527-210500- /O.NEW.KLWX.EH.A.0003.240622T1600Z-240623T0000Z/ District of Columbia-Frederick MD-Carroll-Northern Baltimore- Cecil-Southern Baltimore-Prince Georges-Anne Arundel-Charles- Northwest Montgomery-Central and Southeast Montgomery-Northwest Howard-Central and Southeast Howard-Northwest Harford-Southeast Harford-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Fairfax-Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George-Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun-Northwest Prince William-Central and Southeast Prince William/Manassas/Manassas Park- Including the cities of Charlottesville, Falls Church, Baltimore, Glen Burnie, Odenton, Sterling, Dale City, Jarrettsville, Ellicott City, Turnbull, Clinton, College Park, Gaithersburg, Severn, Damascus, Lisbon, Fredericksburg, Eldersburg, Dahlgren, Ballenger Creek, Herndon, Madison, Bowie, Camp Springs, Annapolis, St. Charles, Falmouth, Ashburn, Stanardsville, Washington, Alexandria, Frederick, Haymarket, Chantilly, Severna Park, Suitland-Silver Hill, Columbia, Gordonsville, Rockville, Arnold, Laurel, Bethesda, Arlington, Purcellville, Reisterstown, Cockeysville, Silver Spring, Leesburg, Lake Ridge, Warrenton, Culpeper, Greenbelt, Westminster, Franconia, Aberdeen, Orange, Waldorf, Germantown, Montclair, South Gate, Elkton, Manassas, Reston, McLean, Woodbridge, Annandale, and Centreville 459 PM EDT Thu Jun 20 2024 ...EXCESSIVE HEAT WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING... * WHAT...Dangerously hot conditions with heat index values up to 110 possible. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...From Saturday afternoon through Saturday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Oppressive heat and humidity will overspread the area Saturday and last into Sunday. Little relief from the heat is expected Saturday night with low temperatures in upper 70s to near 80 for most. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives, neighbors, pets, and livestock. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. && $$

4:50pm EDT on June 20, 2024. With the sun shining directly above a point in the Pacific Ocean between Hawaii and Mexico, this point has reached the farthest distance north of the equator that it will get this year. It's on its way back south in latitude now. Meaning shortening days in the northern hemisphere from here on out until the winter solstice. Why did I type all of this unsolicited information that everyone was already aware of out?... Anyways... ... Currently it's 89/64 at IAD.

Meanwhile, dewpoints have fallen into the upper 50s/low 60s in many spots.

Yes! I remember seeing that classic occlusion beautifully at that location on Radarscope as it cycled and the second circulation developed to the old circulations southeast.

IAD with a forecast high of 76F on a day without CAD or rainy overcast managed to only get up to 75F. One degree shy of the forecast high. Gorgeous. Already down to 57F there right now.

The environment that this evenings storms had. I do wonder if that surface dewpoint is a bit high though.

Confirmed TW now for Montgomery county.

Yeah. That near Poolesville couplet is legit.

LARGE TW now covering NE Loudoun, SE Frederick and western Montgomery counties.

New TW with the Leesburg cell.

The best web-based radar by far, that I know, of for sure. Hopefully it's back up soon.

Cell north of Remington in southern Fauquier county has some very weak rotation with it. Another area of weak rotation approaching Morrisville... nothing much as of the moment just showing that there is some ll shear in place.

Fun times 16 years ago this moment. Let's do this again soon.

Welcome to meteorological/climatological summer.

Forecast Discussion Tuesday, August 13, 2024 11:58AM EDT A dangerous day of tornadoes is already underway. Make sure you know where your safe place is in your home (basement or interior room in the lower floor of a house or apartment). Arc of heavy rain and embedded supercells, some of which are tornadic, continues to lift north through the region and into northern/central MD with the warm front feature that has developed to the ENE of Joyce’s surface low center. With a potent shortwave trough swinging in and phasing with Joyce’s low pressure center, a mid-level dryslot has wrapped around the surface low to the east across Virginia and getting into Maryland along and south of the warm front. This is what’s allowing for some sunshine to continue to overspread the region. Dewpoints have risen into the upper 70s to around 80F south of the front and with the added sunshine temps will rise into the mid/upper 80s this afternoon. This combined with a modest cooling of mid-level temps associated with the approaching shortwave will allow for unusually large CAPE for a remnant tropical system (MLCAPE of around 2500 J/kg or so). The shortwave is also deepening the surface low so, as a result SE surface winds will strengthen across the region with 25-35 kt gusts commonplace. Hodographs will also be very large and curved with a strong 60+kt LLJ overhead resulting in effective SRH easily in excess of 400m2/s2. The sunshine combined with the ample low-level moisture will allow for large 0-3km CAPE of 250-300+ J/kg. All of this combining with 45-55kt effective bulk shear to make conditions highly favorable for a potentially significant tornado outbreak across the region. Currently some supercells which have already caused a number of confirmed tornadoes continue to move NNE into northern and central MD. To the southwest across central and southern VA along and east of the mountains arcs of low-topped supercells, some of which have ongoing tornadoes, continue to mature and strengthen with the increasing instability. As the afternoon progresses bands of supercells will move quickly through the area from SW to NE. These supercells will likely produce several strong to intense tornadoes, some long-track. The Storm Prediction Center is considering an upgrade to a HIGH risk to account for the tornado threat. Due to the slight cooling and drying of the mid-levels, these storms could also produce severe hail as large as 1 to 1.5 inches in diameter. Even if there is no tornado with a particular storm, the 2.25”+ Pwats and large CAPE combining with strong low-level flow could aid in wet downbursts/microbursts bringing severe surface wind gusts. Storms will move to the northeast and exit the area by mid evening as Joyce’s center moves across the region. By the late evening hours the cold front associated with the strong shortwave trough will move through from west to east bringing a 3 to 6 hour window of northwesterly winds gusting 40 to 50mph. A Wind Advisory is in effect for the region to account for this. Temperatures and humidity will fall sharply with this front. Winds will start to weaken towards dawn with temps bottoming out in the 50s in the Greater Metro regions with upper 40s in the far northwestern suburbs. The bottom-line is that this is the beginning of one of the most dangerous tornado outbreaks to impact this area. Please be weather aware and ready to get to your safe places the moment a tornado warning is issued. Wearing a helmet and closed-toed shoes while in your safe place is essential as well to protect from flying debris during a tornado and debris in the aftermath of a tornado. Stay tuned to the NWS for the latest updates available during this event. Forecaster Wannabe: George BM

23/13/6