Area Forecast Discussion
Issued by NWS Grand Rapids, MI

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
379
FXUS63 KGRR 240656
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
256 AM EDT Thu May 24 2018

LATEST UPDATE...
Synopsis/Short Term/Long Term/Marine

.SYNOPSIS...
Issued at 256 AM EDT Thu May 24 2018

High pressure will bring fair weather today and Friday then weak
low pressure will spread some clouds and the chance for showers
and thunderstorms over the weekend.

&&

.SHORT TERM...(Today through Saturday)
Issued at 256 AM EDT Thu May 24 2018

Forecast issue in the near term is timing and coverage of showers
and thunderstorms from late Friday through Saturday. The trend is
for a slightly slower arrival with only a slight chance across the
northwest fringe of the forecast area on Friday afternoon and
reaching the southeast zones by late Friday night.

Instability and shear are weak so no severe storms are expected
but PWATS increase to about 1.5 inches Friday night and Saturday
and isolated heavy downpours are possible.

.LONG TERM...(Saturday night through Wednesday)
Issued at 256 AM EDT Thu May 24 2018

Very mild and rather humid wx will continue through the holiday
weekend with high temperatures in the 80s. There is potential for a
few showers and thunderstorms to develop Sunday mainly during the
afternoon and early evening as instability builds and with some
forcing from a backdoor cold front. However most of the day should
be dry.

A high pressure ridge will build in for the early to middle portion
of next week bringing fair wx with seasonably mild temps. There is
still a small chance for subtropical moisture to move up into our
region late Wednesday or Thursday. However confidence in this
occurring is low given large medium range guidance discrepancies
regarding the evolution and eventual movement of the remnants of the
potential tropical system over the Gulf Coast region this weekend
into early next week.

&&

.AVIATION...(For the 06Z TAFS through 06Z Thursday night)
Issued at 1145 PM EDT Wed May 23 2018

Primarily VFR conditions will deteriorate a bit to mainly MVFR
during the early morning hours Thursday due to development of
patchy fog. Fog will likely become denser at KMKG where conditions
will deteriorate to IFR prior to daybreak.

Patchy early morning fog will gradually dissipate during the mid
morning hours and conditions at all the terminals will improve to
VFR by mid to late morning. Conditions will then remain VFR
Thursday afternoon through Thursday evening with wind speeds aob
10 kts.

&&

.MARINE...
Issued at 256 AM EDT Thu May 24 2018

Dense fog is still a possibility through the morning but the worst
of it is currently remaining well offshore. Winds and waves will
remain relatively light today and tonight with some increase on
Friday as south winds increase to 15 to 20 knots.

&&

.HYDROLOGY...
Issued at 318 PM EDT Wed May 23 2018

Rivers will continue to fall slowly for the next couple of days.
Significant rainfall is not expected.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
LM...Dense Fog Advisory until 11 AM EDT this morning for LMZ844>849.

&&

$$

SYNOPSIS...Ostuno
SHORT TERM...Ostuno
LONG TERM...Laurens
AVIATION...Laurens
HYDROLOGY...04
MARINE...Ostuno



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.