A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >
| Wind Event October 27-28 2013 | |||||||
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Strong and gusty west-northwest winds impacted much of the Bay Area resulting in downed trees(picture), downed power lines, toppled scaffolding(picture) and blown over tractor trailers(picture). An unseasonably cold and rapidly developing low pressure system moved through the Bay Area during the afternoon hours of October 27 th/early morning hours of October 28th. Computer weather models forecasted the rapid cyclogensis just northeast of Napa County rather well several hours in advance. As the surface low rapdily deepened a tight pressure gradient developed across the Bay Area, most notably the East Bay. The computer weather model image below clearly shows the tight packing of the pressure lines over the East Bay. Additionally, a noticeable 6 mb drop in surface pressure was observed at the Nut Tree Airport in Vacaville(see below). The lowering surface pressures also led to a rather robust onshore gradient in excess of 5 mb from San Francisco to Sacramento(see below). The dropping surface pressures and rather strong onshore pressure gradient helped to produce widespread wind gusts in excess of 35 mph with a few locations over 60 mph. (complete list of wind gusts). As the strong onshore winds were squeezed through the East Bay hills winds were enhanced knocking over tractor trailers on Altamont Pass(picture). The strong winds also impacted KSFO airport and a Airport Weather Warning (AWW) was issued for gusts up to 40 kts. The last major wind event to impact the Bay Area was April 8th, 2013 where 70 mph gusts were reported. |
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| Local Storm Report (LSR) - Wind Gusts and Wind Damage | |||||||
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
919 AM PDT MON OCT 28 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0812 PM NON-TSTM WND GST 8 E LIVERMORE 37.69N 121.61W
10/27/2013 M75 MPH ALAMEDA CA MESONET
MESONET STATION ALTAMONT /AATC1/
1157 PM NON-TSTM WND GST 57 SE HOLLISTER 36.35N 120.60W
10/27/2013 M69 MPH SAN BENITO CA MESONET
MESONET STATION SANTA RITA GOES /SRTC1/
0745 PM NON-TSTM WND GST 10 ESE BLACKHAWK 37.79N 121.74W
10/27/2013 M62 MPH CONTRA COSTA CA MESONET
MESONET STATION LOS VAQUEROS RAWS /VAQC1/
1018 PM NON-TSTM WND GST 9 ENE FREMONT 37.55N 121.84W
10/27/2013 M61 MPH ALAMEDA CA MESONET
MESONET STATION CALAVERAS RD RAWS /PEAC1/
0700 PM HIGH SUST WINDS 7 E LIVERMORE 37.69N 121.63W
10/27/2013 M61 MPH ALAMEDA CA MESONET
MESONET STATION 7 E LIVERMORE /CQ234/ PATTERSON PASS RD
&&
$$
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| Public Information Statement (PNS) - Wind Gusts for various sites | |||||||
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
654 AM PDT MON OCT 28 2013
...LATEST WIND REPORTS...
LOCATION SPEED(MPH) TIME/DATE
...CALIFORNIA...
...ALAMEDA...
ALTAMONT (1436 FT) 75 0812 PM 10/27
7 E LIVERMORE (1618 FT) 61 0700 PM 10/27
CALAVERAS RD RAWS (1230 FT) 61 1018 PM 10/27
5 SSW BERKELEY 46 1006 PM 10/27
METROPOLITAN INTL APT (86 FT) 51 0941 PM 10/27
HAYWARD AIR TERMINAL (43 FT) 45 1054 PM 10/27
1 WNW PLEASANTON (352 FT) 41 1044 PM 10/27
OAKLAND SOUTH RAWS (1095 FT) 41 0733 PM 10/27
ALAMEDA MARINA (57 FT) 40 1035 PM 10/27
LIVERMORE MUNICIPAL AIRPORT 39 0636 PM 10/27
ROSE PEAK RAWS (3060 FT) 37 1128 PM 10/27
ALAMEDA POINT 36 1118 PM 10/27
BERKELEY MARINA (45 FT) 35 0710 PM 10/27
...CONTRA COSTA...
LAS TRAMPAS RAWS (1759 FT) 54 0728 PM 10/27
LOS VAQUEROS RAWS (1100 FT) 62 0745 PM 10/27
MALLORY RIDGE RAWS (1948 FT) 53 0702 PM 10/27
PITTSBURG (46 FT) 47 0759 PM 10/27
BLACK DIAMOND RAWS (1600 FT) 45 0728 PM 10/27
1 WSW PLEASANT HILL (577 FT) 41 0700 PM 10/27
2 E CLAYTON (1894 FT) 41 0700 PM 10/27
2 WSW RODEO (25 FT) 40 0758 PM 10/27
BRIONES RAWS (1450 FT) 39 0928 PM 10/27
2 N PITTSBURG 36 0754 PM 10/27
...MARIN...
MIDDLE PEAK RAWS (2339 FT) 52 1036 PM 10/27
PT BLUNT ANGEL ISLAND (10 FT) 45 0758 PM 10/27
BIG ROCK RAWS (1500 FT) 43 0733 PM 10/27
WOODACRE RAWS (1400 FT) 43 0751 PM 10/27
GNOSS FIELD AIRPORT 41 0715 PM 10/27
3 SSW SAUSALITO (30 FT) 40 1153 PM 10/27
BARNABY RAWS (810 FT) 37 0728 PM 10/27
LARKSPUR LANDING (20 FT) 37 1110 PM 10/27
CORTE MADERA (12 FT) 37 1055 PM 10/27
TIBURON (64 FT) 36 1107 PM 10/27
TOMALES BAY (16 FT) 35 0734 PM 10/27
...MARINE REPORTING STATIONS...
BENICIA BRIDGE 46 1000 PM 10/27
TREASURE ISLAND (32 FT) 46 0754 PM 10/27
2 SSE SAUSALITO (270 FT) 42 0730 PM 10/27
ANITA ROCK SAN FRANCISCO 42 1102 PM 10/27
2 WNW VINE HILL 38 1006 PM 10/27
1 W BODEGA BAY (40 FT) 38 1046 PM 10/27
BUOY 26 38 0150 AM 10/28
AQUATIC PARK (25 FT) 48 0743 PM 10/27
DRAKES BAY - PT REYES 45 1212 AM 10/28
SAN LEANDRO MARINA (25 FT) 43 1010 PM 10/27
BUOY 13 40 0150 AM 10/28
4 SSW BERKELEY 40 1006 PM 10/27
1 WNW RODEO 35 0706 PM 10/27
...MONTEREY...
HIGHLANDS PEAK (2490 FT) 36 0300 AM 10/28
15 SSW KING CITY (1113 FT) 36 0425 AM 10/28
...NAPA...
NAPA COUNTY AIRPORT (14 FT) 61 0316 AM 10/28
ATLAS PEAK (1934 FT) 41 0729 PM 10/27
...SAN BENITO...
SANTA RITA GOES (5000 FT) 69 1157 PM 10/27
PINNACLES RAWS (1321 FT) 45 1237 AM 10/28
BLACK MOUNTAIN (3733 FT) 44 0507 AM 10/28
...SAN FRANCISCO...
ALCATRAZ (65 FT) 47 0748 PM 10/27
TWIN PEAKS (862 FT) 43 0734 PM 10/27
...SAN MATEO...
SPRING VLY RAWS (1075 FT) 50 1118 PM 10/27
9 WNW BOULDER CREEK (1607 FT) 42 0315 AM 10/28
2 ENE SAN MATEO (25 FT) 42 0703 PM 10/27
HALF MOON BAY AIRPORT (65 FT) 38 1255 AM 10/28
SAN FRANCISCO WSO AP (8 FT) 51 0910 PM 10/27
CANDLESTICK PT (45 FT) 48 1108 PM 10/27
PULGAS RAWS (644 FT) 48 0918 PM 10/27
2 SE BRISBANE (15 FT) 44 1112 PM 10/27
2 ENE REDWOOD CITY 44 1006 PM 10/27
SAN CARLOS AIRPORT (3 FT) 40 0915 PM 10/27
2 ENE SAN MATEO (38 FT) 39 1202 AM 10/28
COYOTE PT (39 FT) 36 0101 AM 10/28
...SANTA CLARA...
LOS ALTOS RAWS (539 FT) 38 1010 PM 10/27
1 ESE EAST PALO ALTO (25 FT) 40 1120 PM 10/27
SAN JOSE INTERNATIONAL AIRPORT 35 0958 PM 10/27
...SANTA CRUZ...
9 WSW BOULDER CREEK (35 FT) 35 0301 AM 10/28
...SONOMA...
HAWKEYE RAWS (2024 FT) 36 0956 PM 10/27
OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING
EQUIPMENT AND EXPOSURE. NOT ALL DATA LISTED IS CONSIDERED OFFICIAL.
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MMEHLE/WBLIER
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