Excessive Heat and Heat in Virginia, June 29, 2012

Name: Excessive Heat and Heat in Virginia, June 29, 2012
Start: 2012-06-29T12:00
End: 2012-06-29T18:00
Location: Virginia

June 29, 2012 · NWS LWX · 14 events in 14 counties and zones

Plenty of moisture from the Gulf of Mexico caused high humidity during the 29th. Upper-level high pressure along with sunshine caused extremely hot conditions.

Where it happened

Every event with a place to put it; 13 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 14

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LWX wrote it up.

Plenty of moisture from the Gulf of Mexico caused high humidity during the 29th. Upper-level high pressure along with sunshine caused extremely hot conditions. The combination of the heat and humidity caused heat indices to be near or above 105 degrees.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Jun 29, 9:35 AM EST, 2 hours 25 minutes earlier.

Area forecast discussion, Jun 29, 9:35 AM EST, 2 hours 25 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1035 AM EDT FRI JUN 29 2012

.SYNOPSIS...
A LOW PRESSURE TROUGH WILL REMAIN SITUATED IN THE LEE OF THE
APPALACHIANS TODAY. A FRONTAL BOUNDARY WILL STALL ACROSS THE MID
ATLANTIC INTO THE WEEKEND...LINGERING WELL INTO NEXT WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
HEADLINE CHANGES...A LARGE SECTION OF THE MIDDLE CWA IS NOW UNDER
AN EXCESSIVE HEAT WARNING. THE REST OF THE CWA OUTSIDE OF THE
EXTREME WRN PORTIONS OF THE WRN 5 COUNTIES EITHER REMAIN OR WERE
UPGRADED TO A HEAT ADVISORY. THE UPGRADED AREAS WERE ACROSS
PORTIONS OF THE POTOMAC HIGHLANDS. AN EXCESSIVE HEAT WATCH REMAINS
IN EFFECT FOR TMRW FOR NRN VA EAST OF THE BLUE RIDGE...AND MUCH OF
THE I-95 CORRIDOR OF ERN MD.

TEMPS STARTED OUT IN THE 80S AROUND SUNRISE ACROSS MANY
AREAS...THOSE THAT MANAGED TO DROP DOWN INTO THE 70S DID NOT MAKE
IT VERY FAR AND GOOD MIXING FROM A DEEP LAYER JET MAX - 20-30KT
STARTING JUST A THOU FT OFF THE SFC. A STRONG CAP JUST OFF THE
DECK...BUT AT THE TOP OF THE INVERSION IS NOT ONLY 20-30KT WINDS
BUT AN ANALYZED 12Z SOUNDING TEMP OF 30-31C...SLIGHTLY COOLER AT
850. THE WRN HALF OF CWA STARTED OFF EVEN HOTTER THAN THE ERN
HALF...W/ TEMPS BREAKING 90 BY 9 AM AND A DEWPOINT CRAWLING TOWARD
70F. AT THE 10AM HR...MOST ALL OB SITES HAVE REACHED AT LEAST 70F
FOR THEIR DEWPOINTS AND ALL BUT EXTREME NERN MD HAVE TOPPED
90...SOME TOWARD 95. THOUGH THE HIGH DEWPOINTS WILL CUT DOWN A BIT
ON THE MAX TEMPS...EXPECTING A LOT OF THE REGION TO TOP-OUT IN THE
99-101 RANGE AND DEWPOINTS IN THE L70S.

A CORRIDOR ORIENTED FROM THE NRN SHENANDOAH VLY - SE TOWARD THE
PIEDMONT FROM FREDS'BURG TO CHARLTSVLE WILL LIKELY SEE THE HIGHER
COMBINATION OF HEATING-HUMIDITY LEVELS AND THEREFORE THE EXC HEAT
WARNING HAS BEEN ISSUED FOR THESE AREAS. THIS INCLUDES THE SRN
SUBURBS OF DC - DC PROPER AND THE CITY OF BALT. THE NRN DC SUBURBS
AND ERN MD /OUTSIDE OF BALT/ RECEIVED EITHER A DIRECT PASSAGE FROM
THE OVERNIGHT MCS OR SOME OF THE NEARBY OUTFLOW AND ARE A FEW
DEGREES BEHIND THE REST OF THE AREA.

FROM PREV DISC...
LACKING SGFNT FORCING FOR ASCENT...ANY CNVCTN WILL BE DIURNALLY
DRIVEN AND TIED INITIALLY TO THE MTNS WHERE OROGRAPHIC LIFT WILL
AID IN REALIZING INSTBY. GUIDANCE IS CONSISTENT IN DVLPG TSTMS
AROUND 30/0000 UTC IN THE MTNS AND EVOLVING IT INTO A CNVCTV
CLUSTER THAT MOVES SEWD THRU THIS EVE.

POPS WERE FOCUSED IN WRN ZONES LATE THIS AFTN...WHEN ANY TSTMS WILL
BE TERRAIN-FOCUSED. GEOGRAPHIC CVRG OF TSTMS OUGHT TO INCR THIS EVE
AS THEY MOVE SEWD...AND POPS WERE ADJUSTED TO REFLECT THIS CVRG.
DECRG CLDS XPCD LATE THIS EVE BFR ENTRANCE OF CLD DEBRIS EARLY FRI
MRNG FROM EVE TSTMS IN OH.

ADDITIONAL CONCERN TDA REVOLVES AROUND HEAT. HEAT ADZY PREVLY IN
EFFECT WAS RETAINED...ALTHOUGH FCSTD HEAT INDICES ARE SLGTLY HIGHER
THAN IN PREV FCST. ADZY WAS EXPANDED TO INCLUDE THE CNTRL SHENANDOAH
VLY.

MAXIMA IN UPR 90S-LOW 100S XPCD TDA. MINIMA IN THE LOW-UPR 70S XPCD
TNGT OWING TO HIGH BNDRY LYR MSTR CONTENT.

&&

.SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/...
FRONTAL BOUNDARY WILL CROSS THE CWFA DURING THE DAY ON SATURDAY. THE
FRONT WILL BE ACCOMPANIED BY A STRONG SHORTWAVE IN THE MID LEVELS.
ATMOS WILL BE VERY UNSTABLE WITH SB CAPES IN THE 3000 TO 4000 RANGE
DURING THE AFTERNOON. APPROACHING SHORTWAVE WILL HELP ERODE ANY WEAK
CAP IN PLACE...AND STEEPEN THE LAPSE RATES. STORMS MAY BE ONGOING
ACROSS THE FAR NW CWFA IN THE MORNING...BUT ARE EXPECTED TO SPREAD
EASTWARD DURING THE DAY AS THE FRONT NEARS. CURRENTLY...THE BEST
COVERAGE OF STORMS SHOULD BE ACROSS THE MASON DIXON LINE...BUT POPS
MAY HAVE TO BE RAISED DURING LATER FORECAST CYCLES AS THE POSITION
OF BOUNDARIES/SHORTWAVES BECOME CLEARER.

HAVE GONE AHEAD AND RAISED AN EXCESSIVE HEAT WATCH FOR THE URBAN
CORRIDOR...NORTHERN VA PIEDMONT AND CENTRAL VA FOOTHILLS FOR
SATURDAY. HEAT INDICES ARE FORECAST TO RISE TO NEAR 110 DEGREES IN
THE AFTERNOON AHEAD OF THE FRONT. IF CLOUDS ARE THICKER THAN
FORECAST...TEMPS MAY BE A FEW DEGREES COOLER...WHICH COULD MEAN THE
DIFFERENCE BETWEEN A HEAT ADVISORY/HEAT WARNING.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
THE WEATHER WILL REMAIN UNSETTLED THROUGH THE EXTENDED PERIOD OF THE
FORECAST.

SOME DIFFERENCES IN THE STALLED FRONTAL POSITION HAVE BEGUN TO SHOW
UP IN THE NAM AND GFS. THE NAM MOVES THE FRONT FURTHER SOUTH...WHILE
THE GFS KEEPS THE BOUNDARY IN PLACE. THIS COULD MEAN A DIFFERENCE IN
POPS AND TEMPERATURES. HOWEVER...HAVE CHOSEN TO KEEP PERSISTENCE AT
THIS TIME. THE FRONT SHOULD CONTINUE TO PROVIDE FOCUS FOR SHOWERS
AND THUNDERSTORMS...AS MID LEVEL SHORTWAVES MOVE EAST IN THE FLOW.
CONCENTRATION OF POPS DEPENDS UPON THE POSITION OF THE STALLED
FRONT...WHICH WILL EVENTUALLY BECOME DIFFUSE WITH TIME. LOW END
CHANCE/ISO SHOULD SUFFICE FOR NOW. TEMPS REMAIN IN THE 90S FOR THE
PERIOD.

&&

.AVIATION /14Z FRIDAY THROUGH TUESDAY/...
LGT NWLY SFC WINDS WILL BACK TO SWLY THIS AFTN AS LEE TROF SHARPENS.
CIGS AND VSBYS GENLY WILL BE VFR THRU THE PD. TSTMS MAY FORM ON THE
MTNS EARLY THIS EVE AND MOVE SEWD...BUT THEIR GENERATION AND IMPACT
TO TERMINALS IS UNCERTAIN AND HAS NOT BEEN INCLUDED IN THE TAFS ATTM.

SCT TSRA WILL BE LIKELY ON SATURDAY AS A FRONT MOVES ACROSS THE MID
ATLANTIC. STORMS WILL HAVE THE POTENTIAL TO PRODUCE GUSTY WINDS AND
LARGE HAIL.

THE FRONT IS EXPECTED TO BECOME STATIONARY FOR THE REMAINDER OF THE
WEEKEND WELL INTO NEXT WEEK. THE BOUNDARY WILL CONTINUE TO BE A
FOCUS FOR CONVECTION THROUGH THE PERIOD.

&&

.MARINE...
LGT SLY WINDS XPCD TO STRENGTHEN A BIT BY THIS AFTN AS SFC TROF
DVLPS IN LEE OF APLCNS. ASIDE FROM PSBLTY OF SPCL MARINE WRNGS
EARLY THIS MRNG...NO MARINE HAZARDS XPCD THRU TNGT.

SOME CHANNELING UP THE BAY IS POSSIBLE ON SATURDAY AHEAD OF A COLD
FRONT. HAVE KEPT WINDS JUST UNDER SCA CRITERIA FOR NOW...BUT WILL
HAVE TO WATCH FUTURE MODEL RUNS.

THE FRONT IS EXPECTED TO STALL ACROSS THE WATERS WELL INTO NEXT
WEEK. STRONG/SEVERE THUNDERSTORMS ARE POSSIBLE ON SATURDAY ACROSS
THE MARINE AREA...WITH GUSTY WINDS AND LARGE HAIL POSSIBLE.

&&

.CLIMATE...
SVRL DAY PERIOD OF UNUSUALLY HIGH TEMPS XPCD BEGINNING FRI. DAILY
RECORD HIGH MAXIMA AND MINIMA MAY BE THREATENED. BELOW ARE THE
RECORDS FOR THE 3 CLIMATE SITES FOR EACH DAY FRI THRU MON.

DAILY MAXIMA
SITE.....DATE....RECORD...YEAR...FORECAST
DCA   FRI JUN 29  101    1934*   99F
      SAT JUN 30  100    1959   100F
      SUN JUL  1  102    1901    99F
      MON JUL  2  101    1898    97F

BWI   FRI JUN 29  105    1934   100F
      SAT JUN 30  100    1959*   98F
      SUN JUL  1  103    1901    97F
      MON JUL  2  103    1901    96F

IAD   FRI JUN 29   95    1991*   99F
      SAT JUN 30   98    1964   100F
      SUN JUL  1   94    1968*   97F
      MON JUL  2   98    1966    95F

DAILY MINIMA
SITE.....DATE....RECORD...YEAR...FORECAST
DCA   FRI JUN 29   81    1959    74F
      SAT JUN 30   82    1991    79F
      SUN JUL  1   79    1977    76F
      MON JUL  2   79    1872    74F

BWI   FRI JUN 29   76    2010*   72F
      SAT JUN 30   82    1946    73F
      SUN JUL  1   80    1933    74F
      MON JUL  2   80    1901    73F

IAD   FRI JUN 29   74    2010    73F
      SAT JUN 30   73    1991    73F
      SUN JUL  1   72    1991*   73F
      MON JUL  2   71    2005*   71F

* INDICATES RECORD WAS ALSO TIED IN PREVIOUS YEARS.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...EXCESSIVE HEAT WARNING UNTIL 9 PM EDT THIS EVENING FOR DCZ001.
     EXCESSIVE HEAT WATCH FROM SATURDAY MORNING THROUGH SATURDAY
     EVENING FOR DCZ001.
MD...EXCESSIVE HEAT WARNING UNTIL 9 PM EDT THIS EVENING FOR MDZ011-
     016.
     EXCESSIVE HEAT WATCH FROM SATURDAY MORNING THROUGH SATURDAY
     EVENING FOR MDZ009>011-013-014-016.
     HEAT ADVISORY UNTIL 9 PM EDT THIS EVENING FOR MDZ003>007-009-
     010-013-014-017-018-502.
VA...EXCESSIVE HEAT WARNING UNTIL 9 PM EDT THIS EVENING FOR
     VAZ027>031-037>040-042-050>057-501-502.
     EXCESSIVE HEAT WATCH FROM SATURDAY MORNING THROUGH SATURDAY
     EVENING FOR VAZ036>040-042-050>057-501-502.
     HEAT ADVISORY UNTIL 9 PM EDT THIS EVENING FOR VAZ025-026-036.
WV...EXCESSIVE HEAT WARNING UNTIL 9 PM EDT THIS EVENING FOR WVZ052-
     053.
     HEAT ADVISORY UNTIL 9 PM EDT THIS EVENING FOR WVZ050-051-055-
     502-504-506.
MARINE...NONE.

&&

UPDATE...GMS
PREV DISCUSSION...MRK/LISTEMAA

Hazardous weather outlook, Jun 29, 10:37 AM EST, 1 hour 23 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1137 AM EDT FRI JUN 29 2012

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
301000-
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-
1137 AM EDT FRI JUN 29 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...THIS AFTERNOON AND TONIGHT

AN EXCESSIVE HEAT WARNING REMAINS IN EFFECT FOR WASHINGTON DC...
BALTIMORE CITY AND THE I-95 CORRIDOR OF NORTHERN VIRGINIA THROUGH
9 PM. HEAT INDICES OF 110 TO 115 DEGREES ARE EXPECTED.

A HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM FOR EASTERN
MARYLAND...WEST OF THE CHESAPEAKE BAY. HEAT INDICES AROUND 105
DEGREES ARE EXPECTED. REFER TO THE LATEST HAZARD MESSAGE /NPWLWX/
FOR DETAILS ON BOTH HEAT-RELATED HEADLINES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

AN EXCESSIVE HEAT WATCH IS IN EFFECT SATURDAY FOR MUCH OF THE
BALTIMORE AND WASHINGTON METRO AREAS. A HEAT ADVISORY IS LIKELY
FOR HARFORD AND NORTHERN BALTIMORE COUNTIES. REFER TO THE LATEST
HAZARD MESSAGE /NPWLWX/ FOR DETAILS.

HEAT INDICES MAY EXCEED 105 DEGREES ACROSS THE OUTLOOK AREA SUNDAY
INTO EARLY NEXT WEEK.

A SIGNIFICANT SEVERE WEATHER EPISODE IS EXPECTED ON SATURDAY
ACROSS THE OUTLOOK AREA. STORMS WILL BE CAPABLE OF PRODUCING
DAMAGING WIND GUSTS AND VERY LARGE HAIL.

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP SUNDAY AND MONDAY
ALONG A STALLED FRONTAL BOUNDARY. SOME STORMS COULD BECOME SEVERE
AND WILL BE CAPABLE OF DAMAGING WIND GUSTS AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY ON SATURDAY. LIMITED SPOTTER
ACTIVATION MAY BE NEEDED TODAY AND SUNDAY THROUGH MONDAY. PLEASE
RELAY ANY REPORTS OF STRONG WIND OR HAIL TO THE NATIONAL WEATHER
SERVICE.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-301000-
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-
1137 AM EDT FRI JUN 29 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...THIS AFTERNOON AND TONIGHT

AN EXCESSIVE HEAT WARNING REMAINS IN EFFECT FOR MUCH OF NORTHERN
VIRGINA AND PORTIONS OF THE EASTERN WEST VIRGINIA PANHANDLE
THROUGH 9 PM. HEAT INDICES OF 110 TO 115 DEGREES ARE EXPECTED.

A HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM FOR PORTIONS OF WEST
CENTRAL VIRGINIA...NORTH-CENTRAL MARYLAND AND A PORTION OF THE
EASTERN WEST VIRGINIA PANHANDLE. REFER TO THE LATEST HAZARD
MESSAGE /NPWLWX/ FOR DETAILS ON BOTH HEAT-RELATED HAZARDS.

A FEW THUNDERSTORMS MAY DEVELOP EARLY THIS EVENING ALONG THE HIGH
TERRAIN OF THE APPALACHIANS. SOME OF THESE STORMS COULD BECOME
SEVERE AND WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND
LARGE HAIL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

AN EXCESSIVE HEAT WATCH IS IN EFFECT SATURDAY FOR THE THE CENTRAL
FOOTHILLS OF VIRGINIA...THE NORTHERN PIEDMONT AND THE WASHINGTON
DC AND BALTIMORE METRO AREAS. A HEAT ADVISORY IS LIKELY FOR AREAS
OUTSIDE OF THE EXCESSIVE HEAT WATCH...ESPECIALLY EAST OF THE
POTOMAC HIGHLANDS. REFER TO THE LATEST HAZARD MESSAGE /NPWLWX/ FOR
DETAILS.

HEAT INDICES MAY EXCEED 105 DEGREES FOR MUCH OF THE OUTLOOK AREA
SUNDAY THROUGH EARLY NEXT WEEK.

A SIGNIFICANT SEVERE WEATHER EPISODE IS EXPECTED ON SATURDAY
ACROSS THE OUTLOOK AREA. STORMS WILL BE CAPABLE OF PRODUCING
DAMAGING WIND GUSTS AND VERY LARGE HAIL.

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP SUNDAY AND MONDAY
ALONG A STALLED FRONTAL BOUNDARY. SOME STORMS COULD BECOME SEVERE
AND WILL BE CAPABLE OF DAMAGING WIND GUSTS AND LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY ON SATURDAY. LIMITED SPOTTER
ACTIVATION MAY BE NEEDED TODAY AND SUNDAY THROUGH MONDAY. PLEASE
RELAY ANY REPORTS OF STRONG WIND OR HAIL TO THE NATIONAL WEATHER
SERVICE.

In the hours before

Local storm report, Jun 29, 10:06 AM EST, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1106 AM EDT FRI JUN 29 2012

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

0520 AM     HAIL             1 WNW EDGEWOOD          39.43N  76.32W
06/29/2012  E0.88 INCH       HARFORD            MD   TRAINED SPOTTER

&&

EVENT NUMBER LWX1200476

CJL

Local storm report, Jun 29, 10:16 AM EST, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1116 AM EDT FRI JUN 29 2012

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

0522 AM     HAIL             1 ESE JOPPA             39.43N  76.34W
06/29/2012  E1.75 INCH       HARFORD            MD   911 CALL CENTER

&&

EVENT NUMBER LWX1200477

SBK

Local storm report, Jun 29, 10:57 AM EST, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1157 AM EDT FRI JUN 29 2012

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

0507 AM     TSTM WND DMG     LONG GREEN              39.47N  76.53W
06/29/2012                   BALTIMORE          MD   TRAINED SPOTTER

            LARGE BRANCHES ABOUT 8 INCHES IN DIAMETER BLOWN DOWN BY
            STRONG THUNDERSTORM WINDS.

&&

EVENT NUMBER LWX1200478

CJL

Local storm report, Jun 29, 11:32 AM EST, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1232 PM EDT FRI JUN 29 2012

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

0450 AM     HAIL             6 WNW MANCHESTER        39.69N  76.99W
06/29/2012  E1.00 INCH       CARROLL            MD   TRAINED SPOTTER

            HAIL WAS AT LEAST QUARTER SIZED.

&&

EVENT NUMBER LWX1200480

CJL

Local storm report, Jun 29, 11:34 AM EST, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1234 PM EDT FRI JUN 29 2012

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

0450 AM     HAIL             6 WNW MANCHESTER        39.70N  76.99W
06/29/2012  E1.00 INCH       CARROLL            MD   TRAINED SPOTTER

            HAIL WAS AT LEAST QUARTER SIZED.

&&

EVENT NUMBER LWX1200481

CJL

Local storm report, Jun 29, 11:35 AM EST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1235 PM EDT FRI JUN 29 2012

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

0505 AM     HAIL             1 SE JACKSONVILLE       39.51N  76.55W
06/29/2012  E1.00 INCH       BALTIMORE          MD   TRAINED SPOTTER

            HAIL WAS AT LEAST QUARTER SIZED.

&&

EVENT NUMBER LWX1200482

CJL

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

12 excessive heat, 2 heat. Local standard time, as filed.

Heat, Rappahannock

When: June 29, 12:00 PM EST to 6:00 PM EST
Where: Rappahannock forecast zone
Reported by: ASOS
Coordinates: 38.685, -78.159 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 105 and 108 degrees.

Heat, Nelson

When: June 29, 12:00 PM EST to 6:00 PM EST
Where: Nelson forecast zone
Reported by: ASOS
Coordinates: 37.787, -78.887 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 105 and 109 degrees.

Excessive Heat, Fairfax

When: June 29, 12:00 PM EST to 2:00 PM EST
Where: Fairfax forecast zone
Reported by: AWOS
Coordinates: 38.841, -77.291 (the zone’s center; the record gives no point)

Heat indices were reported to be around 110 degrees at Fort Belvoir.

Excessive Heat, Albemarle

When: June 29, 12:30 PM EST to 5:00 PM EST
Where: Albemarle forecast zone
Reported by: ASOS
Coordinates: 38.029, -78.477 (the zone’s center; the record gives no point)

Heat indices were reported to be between 110 and 114 degrees at the Charlottesville Airport.

Excessive Heat, Greene

When: June 29, 12:30 PM EST to 5:00 PM EST
Where: Greene forecast zone
Reported by: ASOS
Coordinates: 38.298, -78.467 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 112 degrees.

Excessive Heat, Madison

When: June 29, 12:30 PM EST to 5:00 PM EST
Where: Madison forecast zone
Reported by: ASOS
Coordinates: 38.414, -78.279 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 112 degrees.

Excessive Heat, Orange

When: June 29, 12:30 PM EST to 5:00 PM EST
Where: Orange forecast zone
Reported by: ASOS
Coordinates: 38.246, -78.013 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 112 degrees.

Excessive Heat, Prince William

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: Prince William forecast zone
Reported by: AWOS

Heat indices were reported to be between 110 and 114 degrees at Quantico.

Excessive Heat, Spotsylvania

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: Spotsylvania forecast zone
Reported by: AWOS
Coordinates: 38.244, -77.558 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 114 degrees.

Excessive Heat, Stafford

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: Stafford forecast zone
Reported by: AWOS
Coordinates: 38.421, -77.457 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 114 degrees.

Excessive Heat, Culpeper

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: Culpeper forecast zone
Reported by: AWOS
Coordinates: 38.486, -77.956 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 114 degrees.

Excessive Heat, Southern Fauquier

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: Southern Fauquier forecast zone
Reported by: AWOS
Coordinates: 38.739, -77.809 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 114 degrees.

Excessive Heat, King George

When: June 29, 1:00 PM EST to 6:00 PM EST
Where: King George forecast zone
Reported by: AWOS
Coordinates: 38.274, -77.156 (the zone’s center; the record gives no point)

Heat indices were estimated to be between 110 and 112 degrees.

Excessive Heat, Arlington

When: June 29, 2:00 PM EST to 4:00 PM EST
Where: Arlington forecast zone
Reported by: ASOS
Coordinates: 38.855, -77.106 (the zone’s center; the record gives no point)

Heat indices were reported to be between 110 and 111 degrees at Reagan National.

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.
Excessive Heat: Heat at or above the local excessive heat warning criteria, or heat that caused deaths.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Virginia in 2012 Every state in 2012 This day in weather history Warnings in Virginia, June 2012

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 392421, 392422, 392438, 392429, 392430, 392431, 392432, 392428, 392433, 392434, 392435, 392436, 392439, 392437.