Alert archive / Maryland / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 262, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 5, 2012, 3:33 PM EDT for Baltimore County, Carroll County, Frederick County, Maryland. It was in force for 42 min. 1 report 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
- Aug 5, 2012, 3:33 PM EDT (19:33 UTC)
- Expired
- Aug 5, 2012, 4:15 PM EDT
- In force
- 42 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Baltimore County, MD, Carroll County, MD, Frederick County, MD
The radar
The Sterling radar (KLWX), 74 km from the middle of the area, began a volume at 19:33 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 |
|---|---|---|---|
| Aug 5, 3:41 PM EDT | TSTM WND DMG | 1 W Uniontown, MD | TREES DOWN AT MIDDLEBURG ROAD AND BARK HILL ROAD. |
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 one storm report to this severe thunderstorm warning; the first came 8 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, 7.6 hours before the alert went out and 74 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
- 809 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
627
WUUS51 KLWX 051933
SVRLWX
MDC005-013-021-052015-
/O.NEW.KLWX.SV.W.0262.120805T1933Z-120805T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
333 PM EDT SUN AUG 5 2012
THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...
CARROLL COUNTY IN NORTH CENTRAL MARYLAND...
NORTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND...
* UNTIL 415 PM EDT
* AT 329 PM EDT...SEVERE THUNDERSTORMS WERE DETECTED ALONG A LINE
EXTENDING FROM EMMITSBURG TO NEW MARKET...AND WERE MOVING NORTHEAST
AT 45 MPH. THIS LINE OF STORMS IS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.
* LOCATIONS IMPACTED INCLUDE...
TANEYTOWN...
MOUNT AIRY...
OAKLAND...
ELDERSBURG...
WESTMINSTER...
GAMBER...
REISTERSTOWN...
MANCHESTER...
HAMPSTEAD...
THIS IS A DANGEROUS LINE OF STORMS. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WIND GUSTS AND FREQUENT CLOUD TO GROUND
LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM
WINDOWS.
LAT...LON 3942 7679 3934 7739 3970 7737 3973 7724
3973 7676
TIME...MOT...LOC 1932Z 233DEG 41KT 3971 7724 3936 7731
$$1 follow-up statement
006
WWUS51 KLWX 051953
SVSLWX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
353 PM EDT SUN AUG 5 2012
MDC021-052003-
/O.CAN.KLWX.SV.W.0262.000000T0000Z-120805T2015Z/
FREDERICK MD-
353 PM EDT SUN AUG 5 2012
...THE SEVERE THUNDERSTORM WARNING IS CANCELLED FOR FREDERICK
COUNTY...
THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED
AREA. THUS THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.
LAT...LON 3940 7710 3958 7710 3973 7715 3973 7676
3942 7679
TIME...MOT...LOC 1953Z 245DEG 26KT 3973 7706 3960 7701
3943 7702
$$
MDC005-013-052015-
/O.CON.KLWX.SV.W.0262.000000T0000Z-120805T2015Z/
CARROLL MD-BALTIMORE MD-
353 PM EDT SUN AUG 5 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR BALTIMORE AND CARROLL COUNTIES...
AT 350 PM EDT...SEVERE THUNDERSTORMS WERE DETECTED ALONG A LINE
EXTENDING FROM LITTLESTOWN TO WESTMINSTER TO 5 MILES NORTHWEST OF
SYKESVILLE...AND WERE MOVING NORTHEAST AT 30 MPH.
THESE STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH.
LOCATIONS IMPACTED INCLUDE...
REESE...
ELDERSBURG...
PATAPSCO...
CARROLLTON...
OAKLAND...
LOUISVILLE...
MANCHESTER...
GREENMOUNT...
MILLERS...
HAMPSTEAD...
LINEBORO...
BORING...
GLYNDON...
UPPERCO...
THIS IS A DANGEROUS LINE OF STORMS. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WIND GUSTS AND FREQUENT CLOUD TO GROUND
LIGHTNING. MOVE INDOORS TO A STURDY BUILDING AND STAY AWAY FROM
WINDOWS.
LAT...LON 3940 7710 3958 7710 3973 7715 3973 7676
3942 7679
TIME...MOT...LOC 1953Z 245DEG 26KT 3973 7706 3960 7701
3943 7702
$$What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 5, 2:56 PM EDT, 37 minutes earlier.
Area forecast discussion, Aug 5, 2:56 PM EDT, 37 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
256 PM EDT SUN AUG 5 2012
.SYNOPSIS...
A COLD FRONT OVER THE GREAT LAKES THIS AFTERNOON WILL CROSS THE
MID-ATLANTIC REGION TONIGHT AND MONDAY. WEAK HIGH PRESSURE WILL
BUILD OVER THE REGION MIDWEEK. THE NEXT COLD FRONT WILL APPROACH
LATE IN THE WEEK.
&&
.NEAR TERM /THROUGH MONDAY/...
SHOWERS AND THUNDERSTORMS WILL BECOME WIDESPREAD FROM WEST TO EAST
ACROSS THE AREA THIS AFTERNOON AND EVENING. SOME OF THE STORMS ARE
STILL EXPECTED TO BE SEVERE WITH STRONG WIND GUSTS MIXING TO THE
SURFACE. CURRENT RADAR IMAGERY SHOWS A LINE OF THUNDERSTORMS MOVING
EASTWARD ACROSS THE NORTHERN SHENANDOAH VALLEY AND MORE STORM
DEVELOPMENT OVER THE POTOMAC HIGHLANDS. THIS TREND IS EXPECTED TO
CONTINUE INTO THE EVENING HOURS AS INSTABILITY BUILT UP THROUGH THE
DAY IS REALIZED. RADAR VELOCITIES AROUND 40KT ARE ALREADY PRESENT IN
SOME OF THESE STORMS AND EXPECT THIS TO CONTINUE THROUGH THE
AFTERNOON. EVEN THOUGH THE UPPER-LEVEL LOW RESPONSIBLE FOR THE
PRESENT COLD FRONT ACROSS THE OHIO VALLEY WILL MOVE WELL TO THE
CWA/S NORTH...IT WILL PROVIDE SUFFICIENT LIFT THIS EVENING AND
OVERNIGHT FOR THUNDERSTORM ACTIVITY. A LOW-LEVEL JET WILL ALSO
ENHANCE THIS LIFT AND CAUSE WINDS IN EXCESS OF 60MPH TO BE MIXED TO
THE SURFACE IN HEAVIER DOWNPOURS.
THE SEVERE THREAT IS EXPECTED TO DIMINISH BY THE LATE EVENING WITH
SHOWERS AND STORMS CONTINUING OVERNIGHT AS THE COLD FRONT APPROACHES
THE AREA. THE FRONT WILL SLOW THEN STALL JUST TO THE SOUTH OF THE
CWA AS IT NEARS THE COAST ENABLING PRECIP TO LINGER THROUGH MUCH OF
MONDAY. DAYTIME TEMPS TOMORROW WILL BE ABOUT 5 DEGREES COOLER AS
WIND SHIFTS TO THE NORTHWEST. WITH THE CLOSE PROXIMITY OF THE
FRONT...THUNDERSTORMS WILL AGAIN BE POSSIBLE TOMORROW ESPECIALLY IF
SOME CLEAR BREAKS IN THE CLOUD COVER DEVELOP. HOWEVER...BY THE EARLY
EVENING HOURS...EXPECT MOST OF THE PRECIP TO BE LOCATED NEAR THE
VA/NC BORDER.
&&
.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY NIGHT/...
HIPRES BEGINS TO BUILD IN FROM THE OH VLY MON NGT. SLIGHT PRESSURE
RISES AND A WEAK NWLY SURGE ON THE SERN PERIPHERY OF THE HIGH SHOULD
BE ENOUGH TO PUSH THE FRONTAL BOUNDARY AND ASSOCIATED PRECIP JUST
SOUTH OF THE CWA MON NGT. THERE ARE DOUBTS WITH HOW FAR SOUTH THE
PUSH OF DRIER SFC AIR MAKES IT MON NGT...WHICH WILL DETERMINE HOW
MUCH TEMPS CAN DROP OVNGT AND IF WE CAN GET SOME RELIEF FROM THE
WARM/MUGGY NGTS.
THE MID-ATLANTIC REGION WILL BE SITUATED BETWEEN THE WRN ATLANTIC
RIDGE AND UPPER TROUGH OVER THE MIDWEST/GREAT LAKES REGIONS TUE
AND WED. LATEST MODEL GUIDANCE SHOWS AN ELONGATED MID-LVL
SHORTWAVE TROUGH ON THE NWRN PERIPHERY OF THE WRN ATLANTIC RIDGE.
THIS TROUGH MEANDERS OVER THE SRN APPALACHIANS AND SRN VA AS
DOWNSTREAM PROGRESSION IS BLOCKED BY THE RIDGE. WITH SUBSIDENCE
FROM THIS TROUGH OVER THE AREA...MOST OF THE CWA WILL REMAIN DRY
TUE. ANY NWD TREND IN THIS SYSTEM...HOWEVER...WOULD PUT CENTRAL
VA AND SRN MD IN A BETTER CHANCE FOR AFTN SHOWERS AND STORMS. ISO
SHOWERS/STORMS MAY DEVELOP WED AFTN IN RESPONSE TO HIGHER
INSTABILITY AND MOISTURE RETURN.
MAX TEMPS GENERALLY 85-90F TUE WILL BE A COUPLE OF DEGREES WARMER
WED. MIN TEMPS TUE AND WED NGTS RANGE NEAR 60 IN THE WRN
HIGHLANDS TO LOWER 70S IN THE I-95 CORRIDOR AND ALONG CHSPK BAY.
&&
.LONG TERM /THURSDAY THROUGH SUNDAY/...
AN UPPER RIDGE WILL REMAIN OVER THE WRN CONUS LATE THIS WEEK
WHILE AN UPPER LOW IS FCST TO DIG SEWD INTO THE GREAT LAKES
REGION...RESULTING IN AMPLIFICATION OF AN ERN CONUS TROUGH.
A RESIDUAL WARM-FRONT BOUNDARY AND/OR LEADING SHORTWAVE ENERGY
ROTATING AROUND THE PERIPHERY OF THE UPPER TROUGH MAY PROVIDE THE
NECESSARY LIFT FOR AFTN SHOWERS AND STORMS THU. UNCERTAINTY OF THE
EVOLUTION OF THESE SMALL-SCALE FEATURES THIS FAR OUT WILL PRECLUDE
ANYTHING HIGHER THAN 20-30 POPS IN THE THU FCST. BETTER CHANCES
FOR SHOWERS AND STORMS FRI AS A COLD FRONT APPROACHES THE REGION.
WILL NEED TO MONITOR THE POTENTIAL FOR SEVERE TSTMS AHEAD OF THE
COLD FRONT LATE IN THE WEEK. THREAT MAY NEED TO BE ADDED TO HWO IN
FUTURE SHIFTS ONCE DETAILS IN THE FCST BECOME CLEARER.
PRECIP CHANCES MAY CONTINUE INTO SAT IF THE FRONT SLOWS DOWN AS IT
APPROACHES THE ERN SEABOARD. PREFER A SLOWER SOLUTION OF FROPA GIVEN
HOW AMPLIFIED THE PATTERN WILL BE AND THAT IT IS SUMMER.
&&
.AVIATION /19Z SUNDAY THROUGH FRIDAY/...
SHOWERS AND THUNDERSTORMS ACROSS AREA TERMINALS COULD REDUCE
VSBY BRIEFLY TO IFR LEVELS THROUGH THE EVE. LOW CIGS AROUND
3-4 KFT ARE EXPECTED TO DEVELOP AS PRECIP BECOMES MORE WIDESPREAD.
A SLOW MOVING FRONT WILL KEEP SHOWERS AND THUNDERSTORMS OVER
THE AREA THROUGH MOST OF THE OVERNIGHT HOURS AND MONDAY MORNING.
OCCASIONAL REDUCTIONS IN VSBY AND LOW-LEVEL CLOUDS ARE EXPECTED
DURING THIS TIME. THUNDERSTORMS MAY REDEVELOP DURING THE EARLY
AFTERNOON NEAR CHO...BEFORE THE FRONT PUSHES SOUTH OF THE AREA
BY MON EVE.
ASIDE FROM PATCHY RADIATIONAL FOG DURING THE ERY MRNG HRS...VFR
CONDITIONS EXPECTED MIDWEEK. AN ISO TSTM IS POSSIBLE WED.
&&
.MARINE...
A SCA IS IN EFFECT FOR THE ENTIRE MARINE AREA UNTIL 8 PM TONIGHT
AND FOR THE MIDDLE/LOWER MD CHESAPEAKE BAY AND LOWER TIDAL POTOMAC
UNTIL EARLY TOMORROW MORNING. A STRONG PRESSURE GRADIENT ACROSS
THE WATERS WILL CONTINUE TO PRODUCE WIND GUSTS OF 20-25 KT.
WIND WILL DIMINISH AS THE GRADIENT RELAXES AFTER A COLD FRONT
CROSSES THE AREA MONDAY.
WINDS BELOW SCA LVLS THRU MIDWEEK.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR ANZ530-
531-535-536-538-539.
SMALL CRAFT ADVISORY UNTIL 6 AM EDT MONDAY FOR ANZ532>534-537-
540>543.
&&
CLS/KLEINHazardous weather outlook, Aug 5, 10:27 AM EDT, 5 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1027 AM EDT SUN AUG 5 2012 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 061000- 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-NORTHERN BALTIMORE-HARFORD- SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS- CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 1027 AM EDT SUN AUG 5 2012 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...TODAY AND TONIGHT THUNDERSTORMS LATE THIS AFTERNOON AND EVENING MAY BECOME SEVERE. THE PRIMARY SEVERE THREAT WILL BE LOCALLY DAMAGING WINDS...BUT A FEW STORMS MAY PRODUCE LARGE HAIL. ADDITIONALLY...HEAVY DOWNPOURS MAY LEAD TO LOCALIZED FLASH FLOODING. A SMALL CRAFT ADVISORY REMAINS IN EFFECT TODAY FOR THE ENTIRE MARYLAND PORTION OF THE CHESAPEAKE BAY AND TIDAL POTOMAC RIVER. THE SMALL CRAFT ADVISORY CONTINUES INTO TONIGHT FOR THE MIDDLE AND LOWER MARYLAND BAY...AND LOWER TIDAL POTOMAC. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED LATE TODAY AND THIS EVENING. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-061000- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-AUGUSTA- ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON- ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-ORANGE-CULPEPER- NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND- EASTERN HIGHLAND-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- WESTERN PENDLETON-EASTERN PENDLETON- 1027 AM EDT SUN AUG 5 2012 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...TODAY AND TONIGHT THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING MAY BECOME SEVERE. THE PRIMARY SEVERE THREAT WILL BE LOCALLY DAMAGING WINDS...BUT A FEW STORMS MAY PRODUCE LARGE HAIL. ADDITIONALLY...HEAVY DOWNPOURS MAY LEAD TO LOCALIZED FLASH FLOODING. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED LATE TODAY AND THIS EVENING.
In the hours before
Special weather statement, Aug 5, 2:23 PM EDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
223 PM EDT SUN AUG 5 2012
VAZ030-031-042-501-WVZ053-051845-
WARREN VA-CLARKE VA-JEFFERSON WV-NORTHERN FAUQUIER VA-LOUDOUN VA-
223 PM EDT SUN AUG 5 2012
...STRONG THUNDERSTORMS TO AFFECT WARREN...CLARKE...JEFFERSON...
NORTHERN FAUQUIER AND LOUDOUN COUNTIES...
AT 222 PM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 2 MILES EAST OF MILLWOOD TO HOWELLSVILLE TO
RIVERSIDE...MOVING EAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE DELAPLANE...BLUEMONT...ST. LOUIS AND ROUND
HILL.
HEAVY RAIN WITH THESE STORMS WILL REDUCE VISIBILITIES TO BELOW ONE
MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THESE STORMS.
&&
LAT...LON 3918 7767 3899 7773 3885 7794 3888 7831
3897 7818 3911 7805
TIME...MOT...LOC 1822Z 266DEG 20KT 3907 7799 3897 7806
3888 7822Special weather statement, Aug 5, 2:34 PM EDT, 59 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
234 PM EDT SUN AUG 5 2012
MDZ003-WVZ051-052-051900-
WASHINGTON MD-MORGAN WV-BERKELEY WV-
234 PM EDT SUN AUG 5 2012
...STRONG THUNDERSTORM TO AFFECT WASHINGTON...MORGAN AND BERKELEY
COUNTIES...
AT 234 PM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER SPRUCE PINE
HOLLOW...MOVING NORTHEAST AT 30 MPH.
LOCATIONS IMPACTED INCLUDE SLEEPY CREEK.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3960 7777 3954 7817 3965 7822 3973 7805
3972 7783
TIME...MOT...LOC 1834Z 247DEG 24KT 3962 7810Special weather statement, Aug 5, 2:53 PM EDT, 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 253 PM EDT SUN AUG 5 2012 VAZ027-029-051930- SHENANDOAH VA-PAGE VA- 253 PM EDT SUN AUG 5 2012 ...STRONG THUNDERSTORM TO AFFECT SHENANDOAH AND PAGE COUNTIES... AT 253 PM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER FORESTVILLE... MOVING EAST AT 25 MPH. LOCATIONS IMPACTED INCLUDE MOUNT JACKSON. HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS IN EXCESS OF 50 MPH ARE EXPECTED WITH THIS STORM. WINDS THIS STRONG CAN BRING DOWN LARGE TREE BRANCHES. TAKE SHELTER UNTIL THE STORM HAS PASSED. && LAT...LON 3887 7846 3869 7839 3867 7872 3876 7875 TIME...MOT...LOC 1853Z 259DEG 20KT 3872 7868
Special weather statement, Aug 5, 2:56 PM EDT, 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 256 PM EDT SUN AUG 5 2012 MDZ003>005-009-VAZ042-051930- FREDERICK MD-MONTGOMERY MD-WASHINGTON MD-CARROLL MD-LOUDOUN VA- 256 PM EDT SUN AUG 5 2012 ...STRONG THUNDERSTORMS TO AFFECT FREDERICK...MONTGOMERY... WASHINGTON...CARROLL AND LOUDOUN COUNTIES... AT 256 PM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE EXTENDING FROM SABILLASVILLE TO 3 MILES SOUTHEAST OF ROUND HILL... MOVING SOUTHEAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE PAEONIAN SPRINGS...LEWISTOWN...GRACEHAM... CLIFTON...ROCKY RIDGE...UTICA...HARRY GROVE STADIUM...DOUBS... LADIESBURG AND DETOUR. HEAVY RAIN WITH THESE STORMS WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS IN EXCESS OF 50 MPH ARE EXPECTED WITH THESE STORMS. WINDS THIS STRONG CAN BRING DOWN LARGE TREE BRANCHES. TAKE SHELTER UNTIL THE STORMS HAVE PASSED. && LAT...LON 3908 7743 3913 7781 3973 7754 3973 7701 TIME...MOT...LOC 1856Z 308DEG 27KT 3967 7744 3909 7773
Special weather statement, Aug 5, 3:21 PM EDT, 12 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
321 PM EDT SUN AUG 5 2012
MDZ004-005-009-010-051945-
FREDERICK MD-MONTGOMERY MD-CARROLL MD-HOWARD MD-
321 PM EDT SUN AUG 5 2012
...STRONG THUNDERSTORMS TO AFFECT FREDERICK...MONTGOMERY...CARROLL
AND HOWARD COUNTIES...
AT 322 PM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM THURMONT TO 2 MILES SOUTHEAST OF ADAMSTOWN...MOVING
EAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE WALKERSVILLE...EMMITSBURG...NEW MARKET...
GREEN VALLEY...TANEYTOWN AND MOUNT AIRY.
STORM INTENSITY IS INCREASING...AND SEVERE WEATHER MAY DEVELOP
RAPIDLY. REMAIN ALERT...AND BE PREPARED TO TAKE ACTION IF WARNINGS
ARE ISSUED.
HEAVY RAIN WITH THESE STORMS WILL REDUCE VISIBILITIES TO BELOW ONE
MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS IN EXCESS OF 50 MPH ARE EXPECTED WITH THESE STORMS. WINDS
THIS STRONG CAN BRING DOWN LARGE TREE BRANCHES. TAKE SHELTER UNTIL
THE STORMS HAVE PASSED.
&&
LAT...LON 3928 7695 3930 7751 3969 7744 3973 7727
3972 7693
TIME...MOT...LOC 1922Z 277DEG 20KT 3964 7738 3929 7744Special weather statement, Aug 5, 3:24 PM EDT, 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 324 PM EDT SUN AUG 5 2012 VAZ026-027-029-030-038>040-051-052-501-502-052000- RAPPAHANNOCK VA-SHENANDOAH VA-WARREN VA-GREENE VA-CULPEPER VA- MADISON VA-PAGE VA-NORTHERN FAUQUIER VA-SOUTHERN FAUQUIER VA- PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA-ROCKINGHAM VA- 324 PM EDT SUN AUG 5 2012 ...STRONG THUNDERSTORMS TO AFFECT RAPPAHANNOCK...SHENANDOAH... WARREN...GREENE...CULPEPER...MADISON...PAGE...NORTHERN FAUQUIER... SOUTHERN FAUQUIER...PRINCE WILLIAM/MANASSAS/MANASSAS PARK AND ROCKINGHAM COUNTIES... AT 324 PM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE EXTENDING FROM 2 MILES WEST OF ASHVILLE TO 2 MILES SOUTHEAST OF LINVILLE...MOVING SOUTHEAST AT 30 MPH. LOCATIONS IMPACTED INCLUDE MASSANUTTEN...STANLEY...SPERRYVILLE... SHENANDOAH...BIG MEADOWS...THE PLAINS...WARRENTON...HAYMARKET...BULL RUN AND MANASSAS. HEAVY RAIN WITH THESE STORMS WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS IN EXCESS OF 50 MPH ARE EXPECTED WITH THESE STORMS. WINDS THIS STRONG CAN BRING DOWN LARGE TREE BRANCHES. TAKE SHELTER UNTIL THE STORMS HAVE PASSED. && LAT...LON 3877 7743 3830 7848 3848 7892 3894 7794 TIME...MOT...LOC 1924Z 293DEG 28KT 3886 7793 3848 7878
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 2:34 PM EDT | Special Weather Statement | LWX | Washington | 26 min |
| Aug 5, 2:56 PM EDT | Special Weather Statement | LWX | Frederick | 34 min |
| Aug 5, 3:16 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 44 min |
| Aug 5, 3:21 PM EDT | Special Weather Statement | LWX | Carroll, Frederick | 24 min |
| Aug 5, 3:53 PM EDT | Special Weather Statement | LWX | Montgomery | 37 min |
| Aug 5, 4:14 PM EDT | Special Weather Statement | LWX | Baltimore | 31 min |
| Aug 5, 4:23 PM EDT | Special Weather Statement | LWX | Howard | 37 min |
| Aug 5, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 46 min |
| Aug 5, 4:36 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 39 min |
| Aug 5, 4:59 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 33 min |
| Aug 5, 5:10 PM EDT | Special Weather Statement | LWX | Anne Arundel | 35 min |
| Aug 5, 5:18 PM EDT | Special Weather Statement | LWX | Harford | 27 min |
| Aug 5, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 29 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2012Every severe thunderstorm warning in 2012
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.