Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at May 26, 2018, 11:38 PM EDT for 4 states. It took effect at May 27, 2018, 2:00 AM EDT. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- May 26, 2018, 11:38 PM EDT (03:38 UTC)
- In effect from
- May 27, 2018, 2:00 AM EDT
- Expired
- May 27, 2018, 10:50 PM EDT
- In force
- 21 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 31 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 03:39 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 3.6 hours before the alert went out and 214 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1255 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
024 WGUS61 KPHI 270338 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 1138 PM EDT Sat May 26 2018 NJZ007>010-012>015-017>020-022-025>027-PAZ060>062-070-071-101>106- 271400- /O.NEW.KPHI.FF.A.0003.180527T0600Z-180527T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington- Ocean-Atlantic-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Hammonton, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 1138 PM EDT Sat May 26 2018 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 AM EDT SUNDAY... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of New Jersey and Pennsylvania, including the following areas, in New Jersey, Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Somerset, Southeastern Burlington, Warren, and Western Monmouth. In Pennsylvania, Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 10 AM EDT Sunday * Showers and thunderstorms are expected to develop overnight in the general vicinity of the Interstate 78 corridor as a cold front sinks south into the area. These storms will be capable of producing very heavy rainfall with rainfall amounts in excess of 2 to 3 inches possible in just a few hours. This may lead to urban and small stream flooding along with flooding of low-lying areas. Flash flooding will also be possible, especially if storms move repeatedly over the same areas. By morning, these showers and storms will shift southward along the front, affecting southeast Pennsylvania, including the Greater Philadelphia area, and central New Jersey. Urban, small stream, and flash flooding will remain a threat as the storms affect these areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && Fitzsimmons/Klein $$
5 follow-up statements
122 WGUS61 KPHI 271030 FFAPHI Flood Watch National Weather Service Mount Holly NJ 630 AM EDT Sun May 27 2018 NJZ007>010-012>015-017>020-022-025>027-PAZ060>062-070-071-101>106- 271400- /O.CON.KPHI.FF.A.0003.000000T0000Z-180527T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington- Ocean-Atlantic-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Hammonton, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 630 AM EDT Sun May 27 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 AM EDT THIS MORNING... The Flash Flood Watch continues for * Portions of New Jersey and Pennsylvania, including the following areas, in New Jersey, Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Somerset, Southeastern Burlington, Warren, and Western Monmouth. In Pennsylvania, Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 10 AM EDT this morning * Heavy showers and storms have developed across portions of central New Jersey extending west into Bucks County Pennsylvania. Storms will continue here through the first part of the morning with additional showers and storms potentially developing across the remainder of the Watch area. These storms will be capable of producing very heavy rainfall with rainfall amounts in excess of 2 to 3 inches possible in just a few hours. This will lead to a continuing urban, small stream, and flash flood threat...especially for areas that see repeated storms. There will likely be a lull in activity late this morning however additional heavy showers and storms are likely to develop by late this afternoon, especially from the Greater Philadelphia area southward. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && Fitzsimmons/Klein $$
450 WGUS61 KPHI 271358 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 958 AM EDT Sun May 27 2018 NJZ007>010-012>015-018>020-025>027-PAZ060>062-071-103>106-271500- /O.EXP.KPHI.FF.A.0003.000000T0000Z-180527T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Camden-Northwestern Burlington-Ocean- Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Berks- Lehigh-Northampton-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Philadelphia, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 958 AM EDT Sun May 27 2018 ...FLASH FLOOD WATCH WILL EXPIRE AT 10 AM EDT THIS MORNING... The Flash Flood Watch for portions of New Jersey and Pennsylvania will expire at 10 AM EDT this morning. While heavy rain continues across portions of the area, rainfall rates have decreased substantially compared to earlier this morning. Therefore, the risk for additional flash flooding has decreased, and the flash flood watch will be allowed to expire. $$ DEZ001>004-MDZ008-012-015-019-020-NJZ016-021-023-024-280800- /O.EXB.KPHI.FF.A.0003.180527T1400Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-Salem-Cumberland-Cape May- Atlantic Coastal Cape May- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, Pennsville, Millville, Cape May Court House, and Ocean City 958 AM EDT Sun May 27 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Mount Holly has expanded the * Flash Flood Watch to include portions of Delaware, northeast Maryland, and southern New Jersey, including the following areas, in Delaware, Delaware Beaches, Inland Sussex, Kent, and New Castle. In northeast Maryland, Caroline, Cecil, Kent MD, Queen Annes, and Talbot. In southern New Jersey, Atlantic Coastal Cape May, Cape May, Cumberland, and Salem. * Until 4 AM EDT Monday morning * Additional showers and thunderstorms are expected to develop early this afternoon across southeastern Pennsylvania and the eastern shore of Maryland and move slowly eastward across southern New Jersey and Delaware through tonight. Torrential downpours may lead to excessive rainfall amounts of up to two inches in one hour and two to five inches within a few hours. Excessive rainfall within a short period of time can lead to rapidly rising waters, particularly in urban areas and along small streams, which can lead to flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$ NJZ017-022-PAZ070-101-102-280800- /O.EXT.KPHI.FF.A.0003.000000T0000Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Gloucester-Atlantic-Delaware-Western Chester-Eastern Chester- Including the cities of Glassboro, Hammonton, Media, Honey Brook, Oxford, West Chester, and Kennett Square 958 AM EDT Sun May 27 2018 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch is now in effect for * Portions of southern New Jersey and southeast Pennsylvania, including the following areas, in southern New Jersey, Atlantic and Gloucester. In southeast Pennsylvania, Delaware, Eastern Chester, and Western Chester. * Until 4 AM EDT Monday morning * Additional showers and thunderstorms are expected to develop early this afternoon across southeastern Pennsylvania and the eastern shore of Maryland and move slowly eastward across southern New Jersey through tonight. Torrential downpours may lead to excessive rainfall amounts of up to two inches in one hour and two to four inches within a few hours. Excessive rainfall within a short period of time can lead to rapidly rising waters, particularly in urban areas and along small streams, which can lead to flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$
160 WGUS61 KPHI 272002 FFAPHI Flood Watch National Weather Service Mount Holly NJ 402 PM EDT Sun May 27 2018 DEZ001>004-MDZ008-012-015-019-020-NJZ016-017-021>024-PAZ070-101- 102-280800- /O.CON.KPHI.FF.A.0003.000000T0000Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-Salem-Gloucester-Cumberland-Atlantic- Cape May-Atlantic Coastal Cape May-Delaware-Western Chester- Eastern Chester- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, Pennsville, Glassboro, Millville, Hammonton, Cape May Court House, Ocean City, Media, Honey Brook, Oxford, West Chester, and Kennett Square 402 PM EDT Sun May 27 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, southern New Jersey, and southeast Pennsylvania, including the following areas, in Delaware, Delaware Beaches, Inland Sussex, Kent, and New Castle. In northeast Maryland, Caroline, Cecil, Kent MD, Queen Annes, and Talbot. In southern New Jersey, Atlantic, Atlantic Coastal Cape May, Cape May, Cumberland, Gloucester, and Salem. In southeast Pennsylvania, Delaware, Eastern Chester, and Western Chester. * Through 4 AM Monday. * Showers and thunderstorms will continue to develop this evening across southeastern Pennsylvania and the eastern shore of Maryland and move slowly eastward across southern New Jersey and Delaware through tonight. Torrential downpours may lead to excessive rainfall amounts of up to two inches in one hour and two to five inches within a few hours. Excessive rainfall within a short period of time can lead to rapidly rising waters, particularly in urban areas and along small streams, which can lead to flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$
562 WGUS61 KPHI 280104 FFAPHI Flood Watch National Weather Service Mount Holly NJ 904 PM EDT Sun May 27 2018 DEZ001-002-MDZ008-012-015-NJZ016-017-021>024-PAZ070-101-102- 280215- /O.CAN.KPHI.FF.A.0003.000000T0000Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Cecil-Kent MD-Queen Annes-Salem-Gloucester- Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-Delaware- Western Chester-Eastern Chester- Including the cities of Wilmington, Dover, Elkton, Chestertown, Centreville, Pennsville, Glassboro, Millville, Hammonton, Cape May Court House, Ocean City, Media, Honey Brook, Oxford, West Chester, and Kennett Square 904 PM EDT Sun May 27 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of Delaware, northeast Maryland, southern New Jersey, and southeast Pennsylvania has been cancelled. The heaviest rain has pushed south of the area and even though additional showers are expected overnight, they are not expected to create flash flooding. $$ DEZ003-004-MDZ019-020-280800- /O.CON.KPHI.FF.A.0003.000000T0000Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Inland Sussex-Delaware Beaches-Talbot-Caroline- Including the cities of Georgetown, Rehoboth Beach, Easton, and Denton 904 PM EDT Sun May 27 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 AM EDT MONDAY... The Flash Flood Watch continues for * Portions of southern Delaware and northeast Maryland, including the following areas, in southern Delaware, Delaware Beaches and Inland Sussex. In northeast Maryland, Caroline and Talbot. * Until 4 AM EDT Monday * Heavy showers and thunderstorms continue this evening across portions of southern Delaware and southern eastern shore of Maryland. These showers and thunderstorms will likely continue for a few more hours. Additional one to two inches of rain may occur in the next few hours. Excessive rainfall within a short period of time can lead to rapidly rising waters, particularly in urban areas and along small streams, which can lead to flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$
787 WGUS61 KPHI 280250 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1050 PM EDT Sun May 27 2018 DEZ003-004-MDZ019-020-280400- /O.CAN.KPHI.FF.A.0003.000000T0000Z-180528T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Inland Sussex-Delaware Beaches-Talbot-Caroline- Including the cities of Georgetown, Rehoboth Beach, Easton, and Denton 1050 PM EDT Sun May 27 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for southern Delaware and portions of northeast Maryland has been cancelled. The heaviest rain has pushed south of the area and even though additional showers are expected overnight, rainfall rates are not expected to be heavy enough to produce flash flooding. $$ JRK
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 6:33 AM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| May 27, 7:30 AM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| May 27, 8:01 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Montgomery | 4 hr |
| May 27, 9:17 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| May 27, 9:21 AM EDT | River Flood Warning | PHI | Bucks | 12 hr |
| May 27, 9:22 AM EDT | Areal Flood Advisory | PHI | Philadelphia | 2 hr |
| May 27, 9:39 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery | 2 hr |
| May 27, 10:27 AM EDT | Areal Flood Warning | PHI | Bucks | 8 hr |
| May 27, 11:18 AM EDT | Areal Flood Warning | PHI | Bucks | 7 hr |
| May 27, 3:22 PM EDT | Coastal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 12 hr |
| May 27, 6:07 PM EDT | Areal Flood Warning | PHI | Bucks | 4 hr |
| May 27, 1:27 AM EDT | Special Marine Warning | PHI | 2 hr | |
| May 27, 1:46 AM EDT | Special Marine Warning | PHI | 89 min | |
| May 27, 1:58 AM EDT | Areal Flood Advisory | PHI | Monmouth | 4 hr |
| May 27, 2:13 AM EDT | Areal Flood Advisory | PHI | Morris, Warren | 4 hr |
| May 27, 4:13 AM EDT | Areal Flood Advisory | PHI | Middlesex, Somerset | 4 hr |
| May 27, 4:28 AM EDT | Flash Flood Warning | PHI | Monmouth | 4 hr |
| May 27, 4:39 AM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| May 27, 5:27 AM EDT | Areal Flood Advisory | PHI | Hunterdon | 4 hr |
| May 27, 5:35 AM EDT | Areal Flood Advisory | PHI | Mercer, Middlesex, Monmouth | 4 hr |
| May 27, 5:43 AM EDT | Flash Flood Warning | PHI | Monmouth | 4 hr |
| May 27, 6:12 AM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Somerset | 4 hr |
| May 27, 8:25 AM EDT | Areal Flood Warning | PHI | Monmouth | 7 hr |
| May 27, 8:40 AM EDT | Areal Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| May 27, 9:05 AM EDT | River Flood Warning | PHI | Mercer | 13 hr |
| May 27, 10:02 AM EDT | Areal Flood Warning | PHI | Monmouth | 6 hr |
| May 27, 10:19 AM EDT | Areal Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 8 hr |
| May 27, 3:10 PM EDT | River Flood Warning | PHI | Somerset | 46 hr |
| May 27, 3:44 PM EDT | Areal Flood Warning | PHI | Monmouth | 16 hr |
| May 27, 1:31 AM EDT | Special Weather Statement | PHI | Sussex | 44 min |
| May 27, 2:03 PM EDT | Areal Flood Advisory | PHI | Kent | 6 hr |
| May 27, 6:18 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| May 27, 7:46 PM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| May 27, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 60 min |
| May 27, 4:52 PM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's | 4 hr |
| May 27, 5:14 PM EDT | Special Weather Statement | PHI | Caroline, Queen Anne's | 61 min |
Nearby
Flash Flood Watches in New Jersey, 2018Flash Flood Watches in Pennsylvania, 2018Flash Flood Watches in Maryland, 2018Every flash flood watch in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.