Halloween Storm Recap

It was a wet and windy Halloween across southeast Michigan.  Warm, moist air was drawn northward ahead of an approaching upper-level trough on Oct. 30.  A warm front pushed through the region late in the evening, sparking a round of showers and a few embedded thunderstorms.  Rain continued for much of the day on Halloween, while temperatures were quite mild for late October, with temperatures reaching the low to mid-60s in most locations.  Breezy southerly winds occurred for much of the day, with gusts topping out in the 30-40 mph range.

As the upper-level trough drew nearer, it prompted a surface low pressure system to rapidly intensify as it moved from eastern Wisconsin to north of Lake Huron by the early morning hours of November 1: 

Loop of infrared satellite and mean sea level pressure from 3:30 pm 31 Oct through 10:30 am 1 Nov

This low dragged a cold front through southeast Michigan around midnight.  Precipitation waned in the wake of the front, but winds increased and turned to west-southwesterly.  High Wind Warnings were in effect for areas north of I-69, with Wind Advisories to the south.  Winds gusted to 40-50 mph during the overnight hours, resulting in a few power outages:

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
700 AM EDT FRI NOV 1 2013

THE FOLLOWING ARE SOME PEAK WIND GUSTS REPORTED TO THE NATIONAL
WEATHER SERVICE TODAY...AS OF 700 AM...

PONTIAC                          48 MPH     213 AM...
PORT HOPE                        48 MPH     439 AM...
BAD AXE                          46 MPH     435 AM...
YPSILANTI                        45 MPH     410 AM...
SAGINAW                          45 MPH     319 AM...
HARRY BROWNE                     44 MPH     414 AM...
FLINT                            43 MPH     448 AM...
LAPEER                           43 MPH     414 AM...
DETROIT METRO AIRPORT            41 MPH     321 AM...
ANN ARBOR                        41 MPH     348 AM...
OWOSSO                           41 MPH     415 AM...
HOWELL                           41 MPH     414 AM...
MONROE                           41 MPH     455 AM...
DETROIT CITY AIRPORT             40 MPH     240 AM...
CARO                             39 MPH     335 AM...
ADRIAN                           37 MPH     403 AM...
TROY                             37 MPH     434 AM...
LAMBERTVILLE                     35 MPH     555 AM...
GROSSE ILE                       33 MPH     554 AM...
PORT HURON                       31 MPH     436 AM...

$$

Storm rainfall totals from late on October 30 through early on November 1 generally ranged from 1 to 2.25 inches, with the heaviest amounts over Lenawee, Washtenaw, and Wayne counties.  Detroit, Flint, and Saginaw all saw their wettest Halloween of all time.  The long duration of the rainfall, combined with relatively dry conditions prior to the rainfall, minimized any flooding concerns.

Storm total rainfall from late 30 Oct to early 1 Nov

NOUS43 KDTX 011357
PNSDTX
MIZ047>049-053>055-060>063-068>070-075-076-082-083-011530-


PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
957 AM EDT FRI NOV 1 2013


HEAVY RAIN REPORTS


LOCATION                   PRECIP      DURATION
                          (INCHES)      (HOURS)        LAT       LON

...BAY COUNTY...
   AUBURN                  M  1.13           48     43.60N    84.08W
   5 N BAY CITY            M  1.21           48     43.66N    83.89W

...GENESEE COUNTY...
   FLINT                   M  1.29           48     43.02N    83.69W
   4 N BURTON              M  1.39           48     43.05N    83.62W

...HURON COUNTY...
   BAY PORT                M  1.40           48     43.85N    83.37W
   5 WNW FILION            M  1.69           48     43.92N    83.10W

...LAPEER COUNTY...
   LAPEER                  M  1.53           48     43.05N    83.32W

...LENAWEE COUNTY...
   MORENCI                 M  2.04           48     41.72N    84.22W
   6 ENE ADRIAN            M  2.21           48     41.93N    83.94W

...LIVINGSTON COUNTY...
   HOWELL                  M  1.36           48     42.61N    83.94W
   3 NW PINCKNEY           M  1.51           48     42.49N    83.99W

...MACOMB COUNTY...
   NEW BALTIMORE           M  1.29           48     42.68N    82.74W
   3 SW SHELBY TOWNSHIP    M  1.61           48     42.64N    83.07W

...MIDLAND COUNTY...
   OIL CITY                M  1.06           48     43.61N    84.59W

...MONROE COUNTY...
   3 S CARLETON            M  1.70           48     42.01N    83.39W

...OAKLAND COUNTY...
   WATERFORD               M  1.34           48     42.66N    83.39W
   4 SSE LAKE ORION        M  1.42           48     42.73N    83.21W
   4 E WHITE LAKE          M  1.50           48     42.65N    83.43W
   4 SW MILFORD            M  1.65           48     42.54N    83.66W

...SAGINAW COUNTY...
   FREELAND                M  1.23           48     43.52N    84.12W
   3 NW SAGINAW            M  1.30           48     43.45N    83.99W

...SANILAC COUNTY...
   4 S LEXINGTON           M  1.15           48     43.21N    82.53W
   MARLETTE                M  1.47           48     43.33N    83.08W

...SHIAWASSEE COUNTY...
   DURAND                  M  1.33           48     42.91N    83.99W

...ST. CLAIR COUNTY...
   ALGONAC                 M  1.05           48     42.62N    82.53W
   YALE                    M  1.24           48     43.13N    82.80W

...WASHTENAW COUNTY...
   ANN ARBOR               M  1.49           48     42.28N    83.73W
   2 SE DEXTER             M  1.56           48     42.31N    83.85W
   MANCHESTER              M  1.74           48     42.15N    84.04W
   MILAN                   M  1.94           48     42.09N    83.68W
   YPSILANTI               M  2.02           48     42.24N    83.62W

...WAYNE COUNTY...
   GROSSE POINTE FARMS     M  1.63           48     42.40N    82.89W
   2 NW DEARBORN HEIGHTS   M  1.64           48     42.35N    83.30W
   3 SSE LIVONIA           M  2.00           48     42.36N    83.35W
   ROMULUS                 M  2.02           48     42.22N    83.37W


M = MEASURED
E = ESTIMATED

$$



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