Severe Thunderstorm Warning 296, NWS Baltimore/Washington

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
307 PM EDT Wed Aug 31 2016

.SYNOPSIS...
A cold front will cross the region on Thursday. High pressure will
build across the region Friday. The storm system currently known
as Tropical Storm Hermine may affect the region over the weekend.

&&

.NEAR TERM /THROUGH THURSDAY/...
Cold front is currently straddled from near Kansas City east-
northeast towards Detroit then on to Montreal. Weak lee side
trough combined with moisture pooling ahead of the front (pw's
approaching 2 inches) is resulting in spotty thunderstorms in
west-central Virginia. As a weak shortwave approaches from the
northwest this evening additional scattered thunderstorms are
expected to develop further north and possibly move east into the
metro. Storms will not be moving very fast and PW's are fairly
high but think there will be just enough movement...when coupled
with recent dry weather...to limit any flood threat...and
CAPE/Shear do not suggest much of a severe weather threat. As the
front slides into the area late tonight and early Thursday,
additoinal showers and a few thunderstorms may continue to
form...supported by trough moving in from the northwest. Speed of
front appears a little slower and nudged highs up a bit while
extending chance of shower/t-storms a bit later in the day than
previous forecast. Overall however...not a washout by any
means. With the front crossing the area and greater cloud
cover...expect temps to run lower than today by 5-10 degrees.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
Upper trough passes overhead Thursday night through Friday night
as high pressure nudges southeastward from the Great Lakes. This
should result in quiet weather with sunshine and more seasonable
temperatures both during the day and at night. Clouds may start to
increase Friday night if Hermine begins to approach.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
12z model guidance has exhibited a significant westward shift
with the future track of what is now Tropical Storm Hermine. This
shift suggests an increasing threat for heavy rain over the CWA.
This would most likely occur Saturday-Sunday. After that point the
system may meander off the coast for several days...continuing to
influence the weather in our area. The exact track and details of
impacts are still very uncertain. Please refer to the National
Hurricane Center for official information and guidance.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
Mainly VFR thru this evening. Scattered thunderstorms may impact
terminals later this afternoon and this evening. Some showers and
an isolated thunderstorm may linger overnight through Thursday.
Some areas may clear out a bit tonight and if those are the same
locales which received rain this evening...some fog may develop.
As the front nudges south early on Thursday...a low cloud deck may
also accompany it...resulting in low cigs. For now have gone MVFR
with cigs/vis at the various terminals...but IFR is possible later
tonight and early Thursday. After front passes later on Thursday
we should go VFR through Friday night.

Uncertain forecast for this weekend regarding future evolution of
TS Hermine coming out of the Gulf of Mexico and up the East Coast.
Sub-VFR with intermittent rain with gusty northerly or
northeasterly flow is possible. Please refer to the National
Hurricane Center for official information and guidance.

&&

.MARINE...
Should be sub SCA thru early Thursday. Front crossing the area
Thursday may kick winds up but SCA gusts may wait until
Thursday night. Thunderstorms are possible on the waters this
evening through Thursday. Dry Friday.

The future track of Tropical Storm Hermine will have a large
impact on the weather over the waters this weekend. Currently
anticipate gusty north to northeast winds but exact speeds are
uncertain. Please refer to the National Hurricane Center for
official information and guidance.

&&

.CLIMATE...
Ranking of summer 2016 in terms of average temperature (JUN 1 - AUG 30)

Site          Rank                    Average Temperature

DC              3                            80.6
Balt           14*                           77.3
IAD             3                            77.4

* tied with 1937, 1944, 1994, and 2006

The number of days in August with the high temperature being at or
above 90 for DCA is 22 through August 30th. This breaks the
old record of 21 set in 1980.

The number of days in August with the high temperature being at or
above 90 for IAD is 19. The record is 20 set in 1980.

The number of days in August with the high temperature being at or
above 90 for BWI is 13. The record is 18 set in 1988.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...None.

&&

SYNOPSIS...RCM
NEAR TERM...RCM
SHORT TERM...RCM
LONG TERM...DFH
AVIATION...RCM/DFH
MARINE...RCM/DFH
CLIMATE...LWX

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
232 PM EDT WED AUG 31 2016

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-011845-
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-
232 PM EDT WED AUG 31 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...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CONSULT THE LATEST GUIDANCE AND INFORMATION FROM THE NATIONAL
HURRICANE CENTER CONCERNING THE POSSIBLE EFFECTS OF TROPICAL STORM
HERMINE. AT THIS TIME THE PRIMARY CONCERN IS FRESHWATER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-011845-
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-
232 PM EDT WED AUG 31 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...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CONSULT THE LATEST GUIDANCE AND INFORMATION FROM THE NATIONAL
HURRICANE CENTER CONCERNING THE POSSIBLE EFFECTS OF TROPICAL STORM
HERMINE. AT THIS TIME THE PRIMARY CONCERN IS FRESHWATER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

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