National Weather Service Mobile - Pensacola

Tropical Storm Ida Makes Late Season Landfall over Dauphin Island, Alabama

Introduction

    During the early morning hours of 10 November 2009 (540 AM CST), Tropical Storm Ida made her initial landfall near Dauphin Island, Alabama with maximum sustained winds near 45 mph with locally higher gusts.  A second landfall occurredaround 6 AM CST near Bon Secour, Alabama.  Wind and Storm surge effects were relatively minimal along the Alabama and extreme northwestern Florida coastlines. It should be noted that surface winds became quite gusty after Ida moved well away from the region and surface high pressure began to move in form the west on the evening after landfall.

    Making landfall as a minimal tropical storm will not be what Ida is remembered for.  Until eclipsed, Ida will have the distinct honor of being the second latest hurricane to form on record for so late in the hurricane season to make landfall along the north central US Gulf Coast (NOTE - Ida was once a hurricane but made landfall as a tropical storm as described above). Hurricane Kate (1985) made landfall as a Category 1 Hurricane near Mexico Beach, Florida on 21 November that year.  Ida 2009 formed into a tropical depression  on 4 November in the southwestern Caribbean Sea. The cyclone endured approximately 10 days before making landfall on the U.S. North Central Gulf Coast.   It achieved hurricane intensity twice and Category 2 intensity once prior to moving through the Yucatan Straights and into the southern Gulf of Mexico on 8 November.  It reached peak intensity of 105 mph on Sunday evening 8 November while over the southern Gulf of Mexico.  After that time, Hurricane Ida encountered very strong vertical wind shear north of 25.0 N latitude and much cooler sea water temperatures which prevented further intensification.  Ida responded by gradually weakening and filling before making landfall as a Tropical Storm over Dauphin Island, Alabama on the morning of the 10th.

First Landfall Second Landfall
Mobile Radar First Landfall Mobile Radar Second Landfall


                                Table 1 - Peak and Sustained Wind Speed data ending 7 AM CST 11 Nov 2009. The data are presented in
                                                descending order. "N/A" indicates not available.
Location - Source Maximum
Sustained Wind (kt)
Peak Wind Gust (kt) Time of Peak
Wind Gust [Day/Time(CST)]
Dauphin Island, AL Bridge - NWS Spotter N/A 54 09/ 1040 PM
Petit Bois Island, AL - NOAA Ports 40 51 09/ 1018 PM
Buoy 42012 (12 S Orange Beach) - NWS 38 - 10 min 49 09/ 656 PM
Fort Morgan, AL - NOAA Ports 40 46 10/ 730 AM
Dauphin Island, AL - NOAA Ports 35 44 09/ 542 PM
Dauphin Island, AL C-MAN (DPIA1) - NWS 30 - 10 min 42 09/ 723 PM
West Mobile, AL Bates Field (MOB) - ASOS 30 - 2min 41 10/ 105 AM
Destin, FL (DTS) - ASOS 28 - 2 min 39 09/ 1129 PM
Gulf Shores, AL (JKA) - AWOS 24 - 2 min 38 09/ 7 PM
Pensacola, FL (PNS) - ASOS 27 - 2 min 38 09/ 1150 PM
NAS Pensacola, FL (NPA) - ASOS 29 - 2 min 37 10/ 132 AM
Middle Bay Lighthouse, Mobile Bay  - USA Mesonet N/A 36 10/ 8 AM
Mary Esther, FL (HRT) - ASOS 21 - 2 min 35 10/ 118 AM
Brookley Field, Mobile, AL  (BFM) - ASOS 27 - 2 min 34 09/ 1104 PM
Valparaiso, FL (VPS) - ASOS 21 - 2 min 34 09/ 859 PM
Fairhope, AL (K4R4)- AWOS 20 - questionable? 33 09/ 7 PM
US Coast Guard on Mobile Bay - NOAA Ports 24 32 10/ 1 AM
Evergreen, AL (GZH) - ASOS 20 - 2 min 27 09/ 1102 PM


                                        Table 2 - Total Tide Height (ft) and estimated Storm Surge Effects. Total Tide Height is composed of the
                                                        astronomical prediction plus Ida's surge effects (ft).  All values are referenced to Mean Low Low
                                                        Water (MLLW).  
"E" means estimated from closest station with a tidal prediction for that hour.
                                                         
The data are presented in descending order with respect to total tide height (MLLW).
Tide Gage - Station ID Time
(Day/UTC)
Astronomical Prediction (ft) Surge Effects (ft) Total Tide Height (MLLW, ft)
Bayou La Batre - BYOA1 10/ 849 E1.3 3.53 4.83
USCG Mobile, AL - 8737048 10/1130 1.35 3.15 4.5
Alabama State Docks, Mobile, AL - 8737048 10/1200 1.3 2.95 4.25
Weeks Bay, AL - 8732828 10/1030 1.45 2.75 4.20
Gulf Shores, AL ICCW - 8731439 10/1415 0.7 3.35 4.05
Pensacola, FL - 8729840 10/1000 1.35 2.65 4.00
Gulf Breeze, FL - GFBF1 10/1552 E1.35 2.63 3.98
Dauphin Island, AL - 8735180 10/1021 1.3 2.63 3.93
Fort Morgan, AL - FMRA1 10/0951 E1.3 2.54 3.84
Destin, FL - East Pass - EPSF1 10/1049 0.4 3.3 3.70
Pensacola, FL - Blue Angel Park - 8729941 10/1215 0.5 3.05 3.55
Fort Walton Beach, FL - FWLF1 10/1030 0.4 2.91 3.31


                            Table 3 - Ida Event Total Rainfall Reports >3.99 inches.  CoCoRaHS data are a two day total ending 6 AM CST
                                           11 Nov 2009. The remainder of the data are for a 24 h period ending at the same time which still captures the
                                           event rainfall due to the timing and cessation around the region.  
The data are presented in descending order.
 Location and Source Amount (in.)
Foley, AL 0.5 ESE - CoCoRaHS 6.61
Summerdale, AL  2.5 ESE - CoCoRaHS 6.13
Elberta, AL - 3.1 SSW - CoCoRaHS 5.84
Foley, AL - 2 SW - CoCoRaHS 5.62
Atmore, AL - NWS COOP 5.41
Elberta, AL  8.2 ESE - CoCoRaHS 5.12
Orange Beach, AL  3.0 ENE - CoCoRaHS 5.04
Orange Beach, AL  1.3 E - CoCoRaHS 5.00
Theodore, AL  3.0 S - CoCoRaHS 5.00
Foley, AL  6.2 SW - CoCoRaHS 4.98
Theodore, AL  2.6 WNW - CoCoRaHS 4.98
Pensacola-11 Mi. Creek - DCP 4.88
Summerdale, AL  4.2 WSW - CoCoRaHS 4.82
Orange Beach, AL  4.9 E - CoCoRaHS 4.58
Orange Beach, AL  2.1 NE - CoCoRaHS 4.54
Mobile, AL  5.7 WSW - CoCoRaHS 4.49
Mobile, AL  4.4 WNW - CoCoRaHS 4.47
Mobile, AL  0.2 N - CoCoRaHS 4.43
Crestview, AL  - ASOS 4.39
Orange Beach, AL  2.5 ENE - CoCoRaHS 4.35
Mobile, AL  4.7W W - CoCoRaHS 4.34
Magnolia River, AL - DCP 4.22
Mobile, AL  1.8W - CoCoRaHS 4.20
Foley, AL 7.4 SW - CoCoRaHS 4.16
Wallace, AL - NWS COOP 4.15
Milton, FL - DCP 4.15
Brewton-Murder Creek, AL - DCP 4.14
Tillman's Corner, AL 3.4 WNW - CoCoRaHS 4.14
Mobile, AL  6.1 WNW - CoCoRaHS 4.09
Waynesboro, MS - NWS COOP 4.05
Mobile, AL  1.2 WSW - CoCoRaHS 4.01
Bay Minette, AL - NWS COOP 4.00

ACKNOWLEDGMENTS and DISCLAIMER:  This page was created by Jeffrey M. Medlin (NWS Mobile, Alabama Science and Operations Officer), Ray Ball (Information Technologist), Jeff Garmon (Warning Coordination Meteorologist) and Kirk Caceres (Meteorologist).  The NWS in Mobile reserves the right to update this information at any time if newer additional information becomes available.

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