Alert archive / Maryland / Flash Flood Warnings in 2006

Flash Flood Warning 38, NWS Baltimore/Washington

June 25, 2006Harford County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 25, 2006, 10:13 PM EDT for Harford County, Maryland. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 25, 2006, 10:13 PM EDT (02:13 UTC)
Expired: Jun 26, 2006, 1:15 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Harford County, MD

The radar

The Dover AFB radar (KDOX), 108 km from the middle of the area, began a volume at 02:14 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, 2.2 hours before the alert went out and 115 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 494 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.5

Open this sounding in Storm Lab

What 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 Jun 25, 9:00 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jun 25, 9:00 PM EDT, 1 hour 13 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
900 PM EDT SUN JUN 25 2006

.UPDATE...THX TO THE SPOTTERS WHO HV BEEN GIVING RAFL REPORTS. TDA -
5.89 IN RESTON AND 6.4 AT GERMANTOWN (INCLUDING 4.4 SINCE 6 PM)
HV PRODUCED CRITICAL FLSH FLDG AND NMRS WATER RESCUES.

TO QUOTE AN OLDIE OH WHATTA NGT. THIS HAS BEEN ONE OF THE BUSIEST
IVE XPRNCD IN YRS. WE HV NMRS FLSH FLD WRNGS OUT ATTM. HV SPENT LTL
TIME LOOKING AT MDLS..BUT WHAT I HV SEEN CONCERNS ME. COMBO OF TROF
JUST TO OUR W AND TROPICAL MOISTURE INFLO MEAN PTNL FOR CONT HVY
RAFL. IM ESPECIALLY CONCERNED ABT TUE. WELL SEE WHAT LATER MDL
RUNS REVEAL.

WE WL ALSO HV TO BEGIN MONITORING THE MAINSTEM RVRS MORE CLOSELY.
ATTM LARGE ONES SUCH AS PTMC/SHENANDOAH ARE LOW DUE TO THE LOW PCPN
AMTS VA HAS RCVD UNTIL THREE DAYS AGO. SMALLER RVRS SUCH AS SENECA
CRK COULD BECOME PROBLEMATIC.

WOODY

.SHORT TERM /TONIGHT THROUGH MONDAY/...

STATIONARY BAND OF HVY RAIN SETTING UP JUST WEST OF THE BLUE RIDE
MTNS FROM WASHINGTON COUNTY MD SWD TO AUGUSTA COUNTY VA. RAIN GAGES
REPORTING 2 TO 3 INCHES OF RAIN PER HOUR IN THE ERN WV PANHANDLE AND
NWRN VA. THIS AREA LOOKS THE MOST SUSCEPTIBLE TO FLASH FLOODING.
THIS IS ALSO FURTHER EAST THAT WHAT SUGGESTED BY MODEL GUIDANCE.
TROPICAL MOISTURE WITH MID 70S DEWPOINTS WILL CONTINUE TO FEED INTO
THIS AREA RESULTING IN WIDESPREAD HVY RAIN TONIGHT. FRONTAL BDRY
RETREATS FURTHER WEST WITH SHOWER ACTIVITY BECOMING A BIT LESS
WIDESPREAD BUT STILL LIKELY POPS WARRANTED. FLOOD WATCH HAS BEEN
EXTENDED UNTIL 10Z MON.

&&

.AVIATION...

PREDOMINANT MVFR CONDITIONS TONIGHT AND TOMORROW XCP IFR IN HVY
SHRA/TSRA.

&&

.MARINE...

SRLY FLOW 10 TO 15 KTS. NO FLAGS. MINOR TIDAL DEPARTURES BEING NOTED
BUT NOT SIGNIFICANT ATTM. LTR FCSTS WILL NEED TO MONITOR.

&&

.HYDROLOGY...

LATEST RFC GUIDANCE SUGGESTS RIVER POINTS WILL RISE ABOVE CAUTION
STAGE AS EARLY AS WEDNESDAY MORNING. WILL CONTINUE TO MONITOR THE
PTNL FOR RIVER FLOODING...WHICH WILL DEPEND HIGHLY ON THE INTENSITY
OF UPSTREAM (W OF BLUE RIDGE) RAINS.

&&

.LONG TERM... MONDAY NGT THROUGH SUNDAY...

EXCESSIVE RAINFALL STILL LIKELY INTO MON NGT...LATER FCSTS MAY NEED
TO EXTEND FLASH FLOOD WATCH YET AGAIN. VERY STRONG LLVL SRLY JET
CONTINUES INTO MON NGT WITH TROP PLUME MOISTURE WORKING FROM THE SE
STATES. WILL CARRY CAT POPS MON NGT FOR MUCH OF THE AREA...BUT BACK
DOWN TO LKLY POPS TUE AND TUE NGT AS S/W TROUGH APPROACHES IT SHOULD
CONTINUE TO PROMOTE PRECIP. TROF SHIFTS TO THE EAST WED AND
LTR...WILL CONTINUE TO MENTION CHC POPS AFTER THAT TIME.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...FLASH FLOOD WATCH FOR DCZ001 UNTIL 6 AM MONDAY.
MD...FLASH FLOOD WATCH FOR MDZ002>007-009>011-013-014 UNTIL 6 AM
     MONDAY.
VA...FLASH FLOOD WATCH FOR VAZ021-025>031-036>042-050>054 UNTIL 6
     AM MONDAY.
WV...FLASH FLOOD WATCH FOR WVZ048>055 UNTIL 6 AM MONDAY.
MARINE...NONE.

&&

ROSA/BROTHERTON

Hazardous weather outlook, Jun 25, 4:35 PM EDT, 5 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
435 PM EDT SUN JUN 25 2006

ANZ530>537-DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-
025>031-036>042-050>057-WVZ048>055-261000-
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-
DISTRICT OF COLUMBIA-ALLEGANY-WASHINGTON-FREDERICK MD-CARROLL-
NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-
PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-HIGHLAND-
AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-
NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN-
ORANGE-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-GRANT-MINERAL-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-
PENDLETON-HARDY-
435 PM EDT SUN JUN 25 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE
EASTERN SHORE INCLUDING THE CHESAPEAKE BAY AND EAST OF GARRETT
COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND CENTRAL VIRGINIA...
WASHINGTON DC AND THE TIDAL POTOMAC RIVER.

.DAY ONE...TONIGHT

A FLASH FLOOD WATCH REMAINS IN EFFECT OVERNIGHT FOR MOST OF THE
OUTLOOK AREA FOR POTENTIAL FLASH FLOOD CONDITIONS. AN ADDITIONAL TWO
TO FOUR INCHES OF RAINFALL IS POSSIBLE THROUGH MONDAY MORNING ACROSS
MUCH OF THE AREA... PARTICULARLY FOR LOCATIONS WEST OF THE BLUE
RIDGE MOUNTAINS. WIDESPREAD FLOODING OF SMALL STREAMS AND CREEKS AND
LOW LYING AREAS IS LIKELY TO BECOME A SIGNIFICANT PROBLEM OVERNIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A STATIONARY FRONT WILL REMAIN OVER OR NEAR THE REGION THROUGH
MIDWEEK CONTINUING THE THREAT FOR SHOWERS AND THUNDERSTORMS. GIVEN
THE HIGH MOISTURE CONTENT OF THE ATMOSPHERE...SOME STORMS COULD
PRODUCE HEAVY RAINFALL. ADDITIONAL MOISTURE WILL MOVE NORTH THROUGH
MID WEEK FROM A TROPICAL AIRMASS OVER THE SOUTHEAST STATES...THIS
MAY BRING RENEWED CONCERNS FOR FLASH FLOODING AND RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS AND EMERGENCY OFFICIALS...PLEASE RELAY ANY REPORTS
OF FLOODING TO THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA.
RAINFALL TOTALS WOULD ALSO BE APPRECIATED.

JB

In the hours before

Local storm report, Jun 25, 6:42 PM EDT, 3 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
642 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0630 PM     FLASH FLOOD      KEENE                   37.87N 78.56W
06/25/2006                   ALBEMARLE          VA   COUNTY OFFICIAL

            HIGH WATER ON ROUTE 20. OFFICIALS REPORT MULTIPLE ROADS

            IN SOUTHEAST PART OF COUNTY CLOSED DUE TO FLASH FLOODING.

&&

WOODCOCK

Local storm report, Jun 25, 8:06 PM EDT, 2 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
806 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0735 PM     FLASH FLOOD      GERMANTOWN              39.18N 77.26W
06/25/2006                   MONTGOMERY         MD   EMERGENCY MNGR

            4-5 WATER RESCUES ACROSS CENTRAL MONTGOMERY COUNTY DUE TO
            FLASH FLOODING

&&

ROGOWSKI

Local storm report, Jun 25, 8:35 PM EDT, 1 hour 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
835 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     FLASH FLOOD      MANASSAS                38.75N 77.49W
06/25/2006                   CITY OF MANASSAS   VA   EMERGENCY MNGR

            WELLINGTON ROAD CLOSED DUE TO FLASH FLOODING

0805 PM     FLASH FLOOD      MANASSAS                38.75N 77.49W
06/25/2006                   CITY OF MANASSAS   VA   EMERGENCY MNGR

            LITEN HALL ROAD CLOSED DUE TO FLASH FLOODING

&&

ROGOWSKI

Local storm report, Jun 25, 8:42 PM EDT, 1 hour 31 minutes before

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Local storm report, Jun 25, 9:39 PM EDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
939 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 PM     FLASH FLOOD      ELLICOTT CITY           39.27N 76.83W
06/25/2006                   HOWARD             MD   EMERGENCY MNGR

            NUMEROUS ROADS CLOSED COUNTYWIDE.

&&

ROGOWSKI

Local storm report, Jun 25, 9:51 PM EDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
951 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0848 PM     FLASH FLOOD      STERLING                39.01N 77.43W
06/25/2006                   LOUDOUN            VA   OTHER FEDERAL

            DULLES AIRPORT REPORTED WATER RESCUES ON ACCESS ROADS AND
            COMMERICAL PARKING LOTS

0945 PM     FLASH FLOOD      WASHINGTON              38.91N 77.02W
06/25/2006                   DISTRICT OF COLUMB DC   FIRE DEPT/RESCUE

            WASHINGTON FIRE REPORTED SEVERAL ROADS CLOSED DUE TO
            FLASH FLOODING IN NORTHEAST

&&

ROGOWSKI

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:51 PM EDT	Flash Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	4 hr
Jun 25, 11:43 PM EDT	Flash Flood Warning	LWX	Highland	4 hr
Jun 26, 12:26 AM EDT	Flash Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	3 hr
Jun 26, 3:44 AM EDT	Flash Flood Warning	LWX	Highland	3 hr
Jun 26, 6:41 AM EDT	Coastal Flood Statement	LWX	Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more	109 min
Jun 26, 8:30 AM EDT	Coastal Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	4 hr
Jun 26, 9:34 AM EDT	Flash Flood Warning	LWX	Augusta, Highland, City of Staunton, City of Waynesboro	6 hr
Jun 26, 10:49 AM EDT	Flash Flood Warning	LWX	Rockingham, City of Harrisonburg	4 hr
Jun 26, 11:09 AM EDT	Flash Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	6 hr
Jun 26, 12:13 PM EDT	Flash Flood Warning	LWX	Fauquier, Prince William, City of Manassas, City of Manassas Park	6 hr
Jun 26, 1:06 PM EDT	Flash Flood Warning	LWX	Culpeper, Orange, Spotsylvania, Stafford, City of Fredericksburg	6 hr
Jun 26, 1:17 PM EDT	Flash Flood Warning	LWX	Loudoun	3 hr
Jun 26, 2:22 PM EDT	Flash Flood Warning	LWX	Nelson	6 hr
Jun 26, 4:56 PM EDT	Flash Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	6 hr
Jun 26, 5:39 PM EDT	Special Marine Warning	LWX		96 min
Jun 26, 6:08 PM EDT	Flash Flood Warning	LWX	Prince William, City of Manassas, City of Manassas Park	6 hr
Jun 25, 8:16 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	4 hr
Jun 25, 10:14 PM EDT	Flash Flood Warning	LWX	Prince George's	3 hr
Jun 25, 10:51 PM EDT	Flash Flood Warning	LWX	Montgomery	4 hr
Jun 25, 11:04 PM EDT	Flash Flood Warning	LWX	Howard	4 hr
Jun 26, 1:01 AM EDT	Flash Flood Warning	LWX	Harford	119 min
Jun 26, 2:32 AM EDT	Flash Flood Warning	LWX	Allegany	4 hr
Jun 26, 4:37 AM EDT	Flash Flood Warning	LWX	Washington	3 hr
Jun 26, 11:15 AM EDT	Flash Flood Warning	LWX	Anne Arundel	4 hr
Jun 26, 11:31 AM EDT	Flash Flood Warning	LWX	Baltimore, Harford, City of Baltimore	6 hr
Jun 26, 1:16 PM EDT	Flash Flood Warning	LWX	Howard	6 hr
Jun 26, 3:34 PM EDT	Flash Flood Warning	LWX	Carroll	6 hr
Jun 26, 7:09 PM EDT	Flash Flood Warning	LWX	Howard	6 hr

Nearby

Flash Flood Warnings in Maryland, 2006 Every flash flood warning in 2006

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.