Alert archive / Maryland / Flash Flood Warnings in 2016
Flash Flood Warning 45, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jul 30, 2016, 7:18 PM EDT for 7 counties in Maryland. It was in force for 9 hr. 17 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 30, 2016, 7:18 PM EDT (23:18 UTC)
- Expired
- Jul 31, 2016, 4:15 AM EDT
- In force
- 9 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Flood severity
- None
Counties Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD
The radar
The Sterling radar (KLWX), 71 km from the middle of the area, began a volume at 23:19 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 30, 8:01 PM EDT | FLOOD | W Ellicott City, MD | US 40 FLOODED AND CLOSED |
| Jul 30, 8:26 PM EDT | FLASH FLOOD | Catonsville, MD | THE STREAM GAUGE ON THE PATAPSCO RIVER AT CATONSVILLE EXCEEDED THE 20 FOOT FLOOD STAGE FROM 826 PM TO JUST AFTER MIDNIGHT. THE PEAK WAS 27.14 FEET AT 915 PM. |
| Jul 30, 8:44 PM EDT | FLASH FLOOD | 3 Sse Damascus, MD | MULTIPLE PEOPLE RESCUED FROM CAR BY BOAT NEAR 8900 BLOCK OF WATKINS RD |
| Jul 30, 8:45 PM EDT | FLOOD | Gaithersburg, MD | NORTH FREDERICK RD MD 355 CLOSED BOTH DIRECTIONS ON BRINK RD. WATER DEPTH ABOUT 10 INCHES DEEP. |
| Jul 30, 8:48 PM EDT | FLASH FLOOD | Arbutus, MD | THE STREAM GAUGE ON EAST BRANCH HERBERT RUN EXCEEDED THE FLOOD STAGE BRIEFLY BETWEEN 848 PM AND 916 PM. |
| Jul 30, 8:48 PM EDT | FLASH FLOOD | Ellicott City, MD | WIDESPREAD FLASH FLOODING OF MAIN STREET -- STRUCTUAL DAMAGE REPORTED |
| Jul 30, 8:52 PM EDT | FLASH FLOOD | Gaithersburg, MD | MULTIPLE PEOPLE RESCUED FROM MULTIPLE CARS NEAR 5700 SUNDOWN RD |
| Jul 30, 8:53 PM EDT | FLOOD | Gaithersburg, MD | WOODFIELD RD CLOSED IN BOTH DIRECTIONS AT CHURCHHILL DOWNS RD WITH ONE FOOT FLOWING ACROSS THE ROAD. |
| Jul 30, 8:53 PM EDT | FLASH FLOOD | 2 Wnw Laytonsville, MD | ROAD CLOSED NEAR INTERSECTION OF WOODFIELD RD AND CHURCHILL DOWNS RD DUE TO A FOOT OF WATER FLOWING ACROSS THE ROAD |
| Jul 30, 8:53 PM EDT | FLASH FLOOD | Gaithersburg, MD | MULTIPLE PEOPLE RESCUED FROM CAR BY BOAT NEAR 19800 GEORGIA AVE |
| Jul 30, 8:55 PM EDT | FLASH FLOOD | Elkridge, MD | THE STREAM GAUGE ON THE PATAPSCO RIVER AT ELKRIDGE RAPIDLY EXCEEDED THE FLOOD STAGE OF 15 FEET AT 855 PM. IT REMAINED ABOVE FLOOD STAGE UNTIL AROUND 135 AM. |
| Jul 30, 9:10 PM EDT | FLOOD | Brookeville, MD | GEORGIA AVE AT BROOKEVILLE RD CLOSED BOTH DIRECTIONS DUE TO HIGH WATER ABOUT ONE FOOT IN DEPTH FLOWING ACROSS THE ROAD. |
| Jul 30, 9:12 PM EDT | FLASH FLOOD | 2 E Woodlawn, MD | THE STREAM GAUGE ON DEAD RUN IN FRANKLINTOWN EXCEEDED THE 10 FOOT FLOOD STAGE BRIEFLY BETWEEN 912 PM AND 953 PM. |
| Jul 30, 9:20 PM EDT | FLOOD | Gaithersburg, MD | INTERSECTION OF ZION RD AND SUNDOWN RD CLOSED WITH ABOUT 8 INCHES OF FLOWING WATER ACROSS THE ROAD. |
| Jul 30, 9:20 PM EDT | FLASH FLOOD | 3 Sw Roxbury Mills, MD | 8 INCHES OF WATER FLOWING ACROSS THE ROAD NEAR INTERSECTION OF SUNDOWN RD AND ZION RD. ROAD BEING CLOSED. |
| Jul 30, 9:21 PM EDT | FLASH FLOOD | 3 E Laytonsville, MD | PERSON RESCUED FROM CAR NEAR 22200 ZION ROAD |
| Jul 30, 9:22 PM EDT | FLOOD | Gaithersburg, MD | NORTH FREDERICK RD MD 355 CLOSED IN BOTH DIRECTIONS AT NEW CUT RD NEAR THE LITTLE SENECA CREEK CROSSING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 11 storm reports to this flash flood warning; the first came 68 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 67 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
- 523 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1000 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted.
443 WGUS51 KLWX 302318 FFWLWX MDC003-005-013-021-027-031-510-310215- /O.NEW.KLWX.FF.W.0045.160730T2318Z-160731T0215Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 718 PM EDT SAT JUL 30 2016 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND... SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND... SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND... HOWARD COUNTY IN CENTRAL MARYLAND... BALTIMORE CITY IN NORTHERN MARYLAND... CENTRAL MONTGOMERY COUNTY IN CENTRAL MARYLAND... SOUTHEASTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND... * UNTIL 1015 PM EDT * AT 718 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. * SOME LOCATIONS THAT ARE EXPECTED TO EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE... WOODLAWN...RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ RCM
10 follow-up statements
663 WGUS71 KLWX 310029 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 829 PM EDT SAT JUL 30 2016 MDC003-005-013-021-027-031-510-310215- /O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0215Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ANNE ARUNDEL MD-BALTIMORE MD-CARROLL MD-HOWARD MD-BALTIMORE CITY MD- MONTGOMERY MD-FREDERICK MD- 829 PM EDT SAT JUL 30 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT FOR NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...HOWARD...CENTRAL MONTGOMERY COUNTIES IN CENTRAL MARYLAND AND SOUTHEASTERN FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND AND BALTIMORE CITY... AT 829 PM EDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING IN MULTIPLE LOCATIONS. 4-5 INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS ALREADY OCCURRING. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE...WOODLAWN... RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES. && LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ RCM
328 WGUS51 KLWX 310123 FFWLWX MDC003-005-013-021-027-031-510-310815- /O.EXT.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 923 PM EDT SAT JUL 30 2016 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS EXTENDED THE * FLASH FLOOD WARNING FOR... NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND... SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND... SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND... HOWARD COUNTY IN CENTRAL MARYLAND... BALTIMORE CITY IN NORTHERN MARYLAND... CENTRAL MONTGOMERY COUNTY IN CENTRAL MARYLAND... SOUTHEASTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND... * UNTIL 415 AM EDT SUNDAY * AT 922 PM EDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING ACROSS THE AREA. SEVERE FLASH FLOODING IS ONGOING IN ELLICOTT CITY. * SOME LOCATIONS THAT ARE EXPECTED TO EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE... WOODLAWN...RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ RCM
343 WGUS71 KLWX 310136 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 936 PM EDT SAT JUL 30 2016 MDC003-005-013-021-027-031-510-310815- /O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ANNE ARUNDEL MD-BALTIMORE MD-CARROLL MD-HOWARD MD-BALTIMORE CITY MD- MONTGOMERY MD-FREDERICK MD- 936 PM EDT SAT JUL 30 2016 ...THIS IS A FLASH FLOOD EMERGENCY FOR HOWARD COUNTY AND SOUTHWESTER BALTIMORE COUNTY... ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT SUNDAY FOR NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...HOWARD...CENTRAL MONTGOMERY COUNTIES IN CENTRAL MARYLAND AND SOUTHEASTERN FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND AND BALTIMORE CITY... AT 934 PM EDT...SPOTTERS AND EMERGENCY MANAGEMENT REPORTED FLASH FLOODING IN MULTIPLE LOCATIONS . FLASH FLOODING IS ALREADY OCCURRING. THIS IS A FLASH FLOOD EMERGENCY FOR HOWARD COUNTY AND SOUTHEASTERN BALTIMORE COUNTY. THIS IS A PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW! SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE...WOODLAWN... RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER. && LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ RCM
280 WGUS71 KLWX 310210 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1010 PM EDT SAT JUL 30 2016 MDC003-005-013-021-027-031-510-310815- /O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ANNE ARUNDEL MD-BALTIMORE MD-CARROLL MD-HOWARD MD-BALTIMORE CITY MD- MONTGOMERY MD-FREDERICK MD- 1010 PM EDT SAT JUL 30 2016 ...THIS IS A FLASH FLOOD EMERGENCY FOR COLUMBIA...ELLICOTT CITY...AND THE LITTLE PATUXENT AND PATAPSCO RIVERS... ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT SUNDAY FOR NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...HOWARD...CENTRAL MONTGOMERY COUNTIES IN CENTRAL MARYLAND AND SOUTHEASTERN FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND AND BALTIMORE CITY... AT 1008 PM EDT...EMERGENCY MANAGEMENT AND STREAM GAUGES RECORDED SIGNIFICANT RISES ON THE LITTLE PATUXENT AND PATAPSCO RIVERS. INTERESTS ON THE LITTLE PATUXENT DOWNSTREAM OF THE CENTENNIAL DAM SOUTHWARD THROUGH COLUMBIA DOWN TO ROUTE 32 NEED TO IMMEDIATELY SEEK HIGHER GROUND FOR RAPID WATER RISES AND THE POTENTIAL FOR UPSTREAM DAM FAILURE. THERE ARE NUMEROUS ROAD CLOSURES IN THE AREA AND SIGNIFICANT FLOODING IS ALSO ONGOING IN ELLICOTT CITY. TAKE ACTION NOW AND DO NOT TRAVEL!!! THIS IS A FLASH FLOOD EMERGENCY FOR COLUMBIA...ELLICOTT CITY...AND THE LITTLE PATUXENT AND PATAPSCO RIVERS. THIS IS A PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW! SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE...WOODLAWN... RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER. && LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ JE
468 WGUS71 KLWX 310240 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1040 PM EDT SAT JUL 30 2016 MDC003-005-013-021-027-031-510-310815- /O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ANNE ARUNDEL MD-BALTIMORE MD-CARROLL MD-HOWARD MD-BALTIMORE CITY MD- MONTGOMERY MD-FREDERICK MD- 1040 PM EDT SAT JUL 30 2016 ...THIS IS A FLASH FLOOD EMERGENCY FOR THE CITY OF BALTIMORE NEAR JONES FALLS...THE LITTLE PATUXENT RIVER NEAR COLUMBIA...AND THE PATAPSCO RIVER NEAR ELLICOTT CITY...ALONG WITH NEARBY AREAS... ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR NORTHERN ANNE ARUNDEL COUNTY IN CENTRAL MARYLAND...SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...SOUTH CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...HOWARD...CENTRAL MONTGOMERY COUNTIES IN CENTRAL MARYLAND AND SOUTHEASTERN FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND AND BALTIMORE CITY... AT 1033 PM EDT...FLOODING WAS ONGOING ALONG THE LITTLE PATUXENT RIVER...ESPECIALY SOUTH OF ROUTE 108 NEAR AND IN COLUMBIA. INTERESTS NEAR THE RIVER SHOULD FOLLOW INSTRUCTIONS FROM LOCAL OFFICIALS AND REMAIN AWAY FROM THE RIVER...WHICH HAS RISEN OVER 10 FEET THIS EVENING AND IS STILL RISING. FLOODING IS ALSO ONGOING ON THE PATAPSCO RIVER...GWYNNS FALLS...AND JONES FALLS...AND SMALLER STREAMS WHICH FLOW INTO THOSE LARGER STREAMS. WIDESPREAD SIGNIFICANT FLOODING IS OCCURRING WITH NUMEROUS ROAD CLOSURES AND WATER RESCUES. THIS IS AN EXTREMELY DANGEROUS SITUATION AND FLOODWATERS ARE EVEN HARDER TO SEE AT NIGHT. STAY IN A SAFE PLACE ON HIGH GROUND!! THIS IS A FLASH FLOOD EMERGENCY FOR MUCH OF HOWARD COUNTY...AND PORTIONS OF BALTIMORE CITY AND COUNTY. THIS IS A PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW! SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE...WOODLAWN... RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. && LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ JE
642 WGUS71 KLWX 310341 FFSLWX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1141 PM EDT SAT JUL 30 2016 MDC003-005-013-027-031-510-310815- /O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ANNE ARUNDEL MD-BALTIMORE MD-CARROLL MD-HOWARD MD-BALTIMORE CITY MD- MONTGOMERY MD- 1141 PM EDT SAT JUL 30 2016 ...THIS IS A FLASH FLOOD EMERGENCY FOR CENTRAL HOWARD COUNTY... ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR NORTHERN ANNE ARUNDEL...SOUTHWESTERN BALTIMORE...SOUTH CENTRAL CARROLL...HOWARD AND CENTRAL MONTGOMERY COUNTIES AND BALTIMORE CITY... AT 1136 PM EDT...NUMEROUS REPORTS OF SIGNIFICANT FLASH FLOODING HAVE BEEN RECEIVED IN A WIDE SWATH FROM BALTIMORE CITY TO ELLICOTT CITY TO COLUMBIA. MAJOR STRUCTURAL DAMAGE HAS BEEN OBSERVED IN ELLICOTT CITY. NUMEROUS ROADS ARE CLOSED THROUGHOUT THE WARNED AREA. THE PATAPSCO RIVER HAS CRESTED AND IS FALLING RAPIDLY. JONES FALLS AND GWYNNS FALLS ARE NEAR CREST NOW BUT BOTH STILL IN FLOOD. THE LITTLE PATUXENT CONTINUES TO RISE...ESPECIALLY FROM COLUMBIA DOWNSTREAM...AND INTERESTS ALONG THE LITTLE PATUXENT SHOULD STAY AWAY FROM THE RIVER. THE PATUXENT RIVER WELL UPSTREAM OF BRIGHTON DAM IS CURRENTLY IN FLOOD. THIS IS A FLASH FLOOD EMERGENCY FOR CENTRAL HOWARD COUNTY. THIS IS A PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW! SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG... OLNEY...PIKESVILLE...COCKEYSVILLE...ELKRIDGE...DAMASCUS...GLEN BURNIE...ELLICOTT CITY...DUNDALK...TOWSON...CATONSVILLE...WOODLAWN... RANDALLSTOWN...MONTGOMERY VILLAGE...PARKVILLE AND OWINGS MILLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. && LAT...LON 3948 7651 3921 7652 3910 7725 3935 7719 $$ JE
748
WGUS71 KLWX 310411
FFSLWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1211 AM EDT SUN JUL 31 2016
MDC013-310419-
/O.CAN.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARROLL MD-
1211 AM EDT SUN JUL 31 2016
...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL CARROLL COUNTY IS
CANCELLED...
LAT...LON 3923 7653 3916 7686 3910 7725 3935 7719
3935 7717 3936 7705 3935 7702 3936 7699
3935 7691 3936 7688 3937 7689 3939 7663
$$
MDC003-005-027-031-510-310815-
/O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-HOWARD MD-BALTIMORE CITY MD-MONTGOMERY MD-
ANNE ARUNDEL MD-
1211 AM EDT SUN JUL 31 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR
SOUTHWESTERN BALTIMORE...HOWARD...CENTRAL MONTGOMERY AND NORTH
CENTRAL ANNE ARUNDEL COUNTIES AND SOUTHWESTERN BALTIMORE CITY...
AT 1209 AM EDT...LOCAL LAW ENFORCEMENT REPORTED WIDESPREAD FLASH
FLOODING IN HOWARD COUNTY...SOUTHERN BALTIMORE COUNTY...AND
BALTIMORE CITY. MANY STREAMS HAVE CRESTED BUT FLOODING IS STILL
ONGOING ON JONES FALLS...GWYNNS FALLS...THE LOWER PATAPSCO RIVER...
THE UPPER PATUXENT RIVER...AND PRIMARILY THE LITTLE PATUXENT RIVER.
INTERESTS ALONG THE LITTLE PATUXENT RIVER FROM NEAR COLUMBIA TO NEAR
CROFTON SHOULD BE AWAY FROM THE RIVER AND REMAIN SO THROUGH THE
OVERNIGHT HOURS. SIGNIFICANT FLOODING IS OCCURRING AND IS EXPECTED
TO CONTINUE.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BALTIMORE...COLUMBIA...GERMANTOWN...ROCKVILLE...GAITHERSBURG...
OLNEY...PIKESVILLE...ELKRIDGE...DAMASCUS...ELLICOTT CITY...TOWSON...
CATONSVILLE...WOODLAWN...RANDALLSTOWN...MONTGOMERY VILLAGE...
ELDERSBURG...MILFORD MILL...LOCHEARN...NORTH POTOMAC AND ARBUTUS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.
&&
LAT...LON 3923 7653 3916 7686 3910 7725 3935 7719
3935 7717 3936 7705 3935 7702 3936 7699
3935 7691 3936 7688 3937 7689 3939 7663
$$
JE155
WGUS71 KLWX 310506
FFSLWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
106 AM EDT SUN JUL 31 2016
MDC003-005-027-031-510-310815-
/O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-HOWARD MD-BALTIMORE CITY MD-MONTGOMERY MD-
ANNE ARUNDEL MD-
106 AM EDT SUN JUL 31 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR
SOUTHWESTERN BALTIMORE...HOWARD...NORTHEASTERN MONTGOMERY AND NORTH
CENTRAL ANNE ARUNDEL COUNTIES AND SOUTHWESTERN BALTIMORE CITY...
AT 101 AM EDT...FLOODING CONTINUED ON THE UPPER PATUXENT AND LITTLE
PATUXENT RIVERS...AND THE GWYNNS FALLS AND LOWER PATAPSCO RIVERS.
THE MOST SIGNIFICANT FLOODING REMAINING IS ON THE LITTLE
PATUXENT...WHERE THE RIVER IS STILL RISING FROM COLUMBIA TO ANNE
ARUNDEL COUNTY. SEVERAL ROADS ARE REPORTED CLOSED...INCLUDING US 29
NEAR COLUMBIA TOWN CENTER.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BALTIMORE...COLUMBIA...OLNEY...PIKESVILLE...ELKRIDGE...ELLICOTT
CITY...TOWSON...CATONSVILLE...WOODLAWN...RANDALLSTOWN...MILFORD
MILL...LOCHEARN...ARBUTUS...REDLAND...BROOKLYN PARK...PUMPHREY...
SAVAGE-GUILFORD...SCAGGSVILLE...ILCHESTER AND LINTHICUM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.
&&
LAT...LON 3923 7653 3916 7686 3913 7714 3929 7717
3931 7697 3930 7675 3938 7680 3938 7679
3939 7663
$$
JE150
WGUS71 KLWX 310631
FFSLWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
231 AM EDT SUN JUL 31 2016
MDC003-005-027-031-510-310815-
/O.CON.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-HOWARD MD-BALTIMORE CITY MD-MONTGOMERY MD-
ANNE ARUNDEL MD-
231 AM EDT SUN JUL 31 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR
SOUTHWESTERN BALTIMORE...HOWARD...NORTHEASTERN MONTGOMERY AND NORTH
CENTRAL ANNE ARUNDEL COUNTIES AND SOUTHWESTERN BALTIMORE CITY...
AT 228 AM EDT...FLOODING CONTINUED ON THE LITTLE PATUXENT
RIVER...THE GWYNNS FALLS...AND LOWER PATAPSCO RIVER. FLOODING WAS
ABOUT TO BEGIN ON THE HAWLINGS RIVER. THE MOST SIGNIFICANT FLOODING
REMAINING IS ON THE LITTLE PATUXENT...WHERE THE RIVER IS STILL
RISING FROM COLUMBIA TO ANNE ARUNDEL COUNTY. SEVERAL ROADS ARE
REPORTED CLOSED...INCLUDING US 29 NEAR COLUMBIA TOWN CENTER.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BALTIMORE...COLUMBIA...OLNEY...PIKESVILLE...ELKRIDGE...ELLICOTT
CITY...TOWSON...CATONSVILLE...WOODLAWN...RANDALLSTOWN...MILFORD
MILL...LOCHEARN...ARBUTUS...REDLAND...BROOKLYN PARK...PUMPHREY...
SAVAGE-GUILFORD...SCAGGSVILLE...ILCHESTER AND LINTHICUM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.
&&
LAT...LON 3923 7653 3916 7686 3913 7714 3929 7717
3931 7697 3930 7675 3938 7680 3938 7679
3939 7663
$$
MJM739
WGUS71 KLWX 310807
FFSLWX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
407 AM EDT SUN JUL 31 2016
MDC003-005-027-031-510-310815-
/O.EXP.KLWX.FF.W.0045.000000T0000Z-160731T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BALTIMORE MD-HOWARD MD-BALTIMORE CITY MD-MONTGOMERY MD-
ANNE ARUNDEL MD-
407 AM EDT SUN JUL 31 2016
...THE FLASH FLOOD WARNING FOR SOUTHWESTERN BALTIMORE...HOWARD...
NORTHEASTERN MONTGOMERY AND NORTH CENTRAL ANNE ARUNDEL COUNTIES AND
SOUTHWESTERN BALTIMORE CITY WILL EXPIRE AT 415 AM EDT...
THE THREAT OF RAPID-LIFE THREATENING FLOODING HAS ENDED...BUT THE
FLOOD THREAT CONTINUES FOR AREAS ALONG THE LITTLE PUTUXENT RIVER. A
FLOOD WARNING HAS BEEN ISSUED TO REPLACE THE FLASH FLOOD WARNING IN
THOSE AREAS.
LAT...LON 3923 7653 3916 7686 3913 7714 3929 7717
3931 7697 3930 7675 3938 7680 3938 7679
3939 7663
$$
MJMWhat forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this flash flood warning went out at Jul 30, 3:09 PM EDT, 4 hours 9 minutes earlier.
Area forecast discussion, Jul 30, 3:09 PM EDT, 4 hours 9 minutes before
Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
309 PM EDT Sat Jul 30 2016
.SYNOPSIS...
A weak front will remain across the area today and tonight. An
area of low pressure will track along the front on Sunday. The
front will move southward on Monday, with high pressure building
in for the middle portion of the week.
&&
.NEAR TERM /THROUGH TONIGHT/...
Not a ton of organization on radar this afternoon. The initial
area of thunderstorms to develop were on the nose of the 850 mb
thermal ridge. That area now just west of the Chesapeake Bay. The
best moisture (axis of precipitable waters 2.00-2.25 inches) co-
located with this activity. Additional storms have more recently
developed in the Potomac Highlands. All storms have reasonable
CAPE (1000-1500 j/kg ML...2000-3000 j/kg SB/MU) and decent
effective shear (30-35 kt). But mid level lapse rates poor and
freezing level/wet bulb zero high...with isentropic upglide really
the only synoptic scale lifting mechanism into the evening. A few
wet microbursts possible.
The flood threat may be the more achievable hazard. Due to the
organization (or lack thereof) of the activity and the struggle
for model guidance to simulate it, its been tough to pinpoint an
area of greater concern. If I had to name someplace, metro
Baltimore may be it, based on recent radar trends, and ensemble of
qpf solutions, and HRRR-TLE probabilistic output. Even there,
confidence isn't exceptionally high, as HRRR has been playing
catch-up all day, and synoptic scale guidance seems to be overdone
on areal coverage of convection. Therefore will not post a Flood
Watch at this time. Obviously we will continue to monitor. If a
watch is posted, it may end up being short-fused.
Guidance suggesting that a trough axis/surface convergence line
will be crossing the area (slowly) this evening into the
overnight hours. That may support an uptick in convective
activity. Will reflect that in the evening, with confidence waning
in specific late evening into the overnight.
&&
.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
Height falls and the passage of the weak surface boundary will be
the features on Sunday. Moisture shouldn't be quite as deep, but
think that there will be enough to initiate at least scattered
convection upon diurnal destabilization. Precipitable water values
seasonable, which means that heavy rain will again be a
possibility. Best convergence likely to be in the east (I-95
corridor).
Gradual drying will occur by Monday. Still have widely scattered
PoPs, as the 500 mb trough axis likely will be primary
instigator, but the time frame will be more limited.
Temperatures will be seasonable through the period. Have not
strayed far from a MOS blend.
&&
.LONG TERM /TUESDAY THROUGH SATURDAY/...
Dry conditions expected on Tuesday and Wednesday with surface
ridging and trough aloft. Guidance suggests some afternoon showers
and thunderstorms possible on Wednesday... mainly to the western
part of our CWA. Shortwave trough will keep the chance of showers
and thunderstorms on Thursday and Friday... and then an
approaching front Friday night into Saturday will continue this
trend. High temperatures will be mainly in the 80s and reaching
the 90s Friday and Saturday at some locations.
&&
.AVIATION /19Z SATURDAY THROUGH THURSDAY/...
Radar starting to fill in. Flight restrictions will be spotty,
coincident with where strong storms track. Its problematic to
pinpoint specifics in TAFs, even for TEMPO groups, so they
reflect an optimistic outlook. May be making frequent updates.
Local IFR (or lower) likely within storms. The most likely period
of adverse weather will be late afternoon and early evening. In
addition to low vsbys, wind gusts of 30-40 mph possible.
While residual low level moisture suggests fog will be a
possibility tonight, there are also indications that flow may
turn westerly, with slightly drier air attempting to work east
overnight. For that reason, don't have much in terms of fog
restrictions overnight...just areas of MVFR. If that doesn't work
out, then IFR will be a concern.
Sunday will be unsettled again, but storms should not be as
widespread or as intense. Still a risk of scattered afternoon-
evening storms, with flight restrictions contained within.
Monday will follow the same trend, as storms will be fewer and
weaker.
Mainly VFR conditions expected for Tuesday through Thursday...
with some showers and thunderstorms possible... bringing periods
of sub-VFR conditions.
&&
.MARINE...
South gradient winds have increased ahead of an area of
thunderstorms. Have raised Small Craft on the Bay south of Pooles
Island as well as the mouth of the Potomac to account for this.
On top of the gradient winds, there is a threat of higher winds
near thunderstorms. Special Marine Warnings will be likely this
afternoon and evening. Am uncertain how long into the overnight
this will last.
Thunderstorms will be fewer each day Sunday and Monday. Outside of
thunderstorms, do not see significant winds.
Sub-SCA conditions expected as winds will be below SCA criteria.
Showers and thunderstorms possible over the waters during this
period could bring gusty winds.
&&
.TIDES/COASTAL FLOODING...
Due to an increase in south winds, water levels have risen today.
Water levels range between 3/4 ft to almost 1 ft above
astronomical normals. The lower of the two high tides ongoing now.
A few caution stages threatened, but that's it. However,
departures should remain the same or rise slightly tonight, which
causes concern. Have opted to raise Coastal FLood Advisory for
Anne Arundel and Calvert Counties for the overnight hours.
Tides will need to be monitored next couple of days. The night
time tide cycle will be the one of concern.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Coastal Flood Advisory from 11 PM this evening to 8 AM EDT
Sunday for MDZ014-018.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 10 PM EDT this evening for
ANZ531>534-537-540-541-543.
&&
SYNOPSIS...ADS
NEAR TERM...HTS
SHORT TERM...HTS
LONG TERM...IMR
AVIATION...HTS/IMR
MARINE...HTS/IMR
TIDES/COASTAL FLOODING...htsHazardous weather outlook, Jul 30, 4:58 PM EDT, 2 hours 20 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 458 PM EDT SAT JUL 30 2016 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-312100- CHESAPEAKE BAY NORTH OF POOLES ISLAND MD- CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD- CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD- CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD- CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA- TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD- TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA- PATAPSCO RIVER INCLUDING BALTIMORE HARBOR- CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY- CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER- PATUXENT RIVER TO BROOMES ISLAND MD- TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-PRINCE GEORGES- ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-SOUTHEAST HARFORD- PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 458 PM EDT SAT JUL 30 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF COLUMBIA. .DAY ONE...TONIGHT THUNDERSTORMS WITH HEAVY RAIN REMAIN POSSIBLE THROUGH THIS EVENING...RESULTING IN LOCALIZED FLOODING. THESE THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING STRONG WINDS THIS EVENING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-312100- WASHINGTON-FREDERICK MD-CARROLL-NORTHERN BALTIMORE- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY- NORTHWEST MONTGOMERY-CENTRAL AND SOUTHEAST MONTGOMERY- NORTHWEST HOWARD-CENTRAL AND SOUTHEAST HOWARD-NORTHWEST HARFORD- AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE- NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-ORANGE-CULPEPER- NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND- EASTERN HIGHLAND-WESTERN LOUDOUN-EASTERN LOUDOUN- NORTHERN VIRGINIA BLUE RIDGE-CENTRAL VIRGINIA BLUE RIDGE- HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY-WESTERN GRANT- EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL-WESTERN PENDLETON- EASTERN PENDLETON- 458 PM EDT SAT JUL 30 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA... NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND WITH THE EXCEPTION OF GARRETT COUNTY. .DAY ONE...TONIGHT THUNDERSTORMS WITH HEAVY RAIN REMAIN POSSIBLE THROUGH THIS EVENING...RESULTING IN LOCALIZED FLOODING. THESE THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING STRONG WINDS THIS EVENING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 3:08 PM EDT | Coastal Flood Advisory | LWX | Anne Arundel, Calvert, Saint Mary's | 15 hr |
| Jul 30, 4:02 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 43 min |
| Jul 30, 4:11 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 49 min |
| Jul 30, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 45 min |
| Jul 30, 7:09 PM EDT | Areal Flood Warning | LWX | Carroll, Frederick | 6 hr |
| Jul 30, 7:31 PM EDT | Areal Flood Warning | LWX | Frederick, Montgomery | 6 hr |
Nearby
Flash Flood Warnings in Maryland, 2016Every flash flood warning in 2016
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.