CapeFish
Registered User
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Posts: 1
Loc: Cape Coral, Florida
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Quote:
How many miles in 1 deg lat/long. And how is a statute mile different from a nautical. I read something the other day saying "50 nautical miles; 65 statute miles or vice versa. Thanks for any insight.
Hello, I am a new user and this is my first post. I live in SW Florida just south of Punta Gorda.
1 mile = 0.868976242 knot
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Have A Nice Day,
CapeFish
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Clark
Meteorologist
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Loc:
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1 degree of latitude is 111 kilometers, or about 69 statue miles or 60 nautical miles. 1 degree of longitude varies based upon latitude; at the equator, it is also about 111 kilometers, but decreases to about 55.5 kilometers at 60°N/S. The exact conversion is 111km times the cosine of the latitude.
A nautical mile is the distance in one minute of latitude. Recall that latitude is measured in degrees/minutes/seconds. Thus, since there are 60 minutes in 1 degree of latitude, there is a nearly direct conversion between nautical miles and latitude. It is equal to 1.15 times the length of a statute mile, which is the normal mile we refer to in speed and driving discussions. One nautical mile is 1.85km in length; one statute mile is 1.61km in length.
Usually, measurements of the storm's position accuracy and eyewall diameter are given in nautical miles, whereas most distances -- especially in public advisories -- are given in statute miles.
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Current Tropical Model Output Plots
(or view them on the main page for any active Atlantic storms!)
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DebbiePSL
Weather Guru
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Posts: 151
Loc: Saint Marys Georgia
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After being in the eye of both and jeanne last year, just three weeks apart , and just getting my house fixed, I don't know if emotionally I am ready to deal with another one
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HanKFranK
User
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Posts: 1841
Loc: Graniteville, SC
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nhc's initial prog of the new depression is close to what i was thinking/commenting on earlier. i've got a hunch that this one is going to reach the united states around july 18/19... the evolving pattern doesn't look like it will offer a recurvature route at sea (unless the models are totally out to lunch on building the ridge back) what kind of storm it is at the time will largely depend upon how many islands it smacks into on the way, is my reckoning. i was thinking the ne caribbean... virgin islands, maybe puerto rico would have the storm pass close by july 14/15... and that it would get to the north of hispaniola before getting under the solid western extent of the ridge. florida was the first place that occured to me.. i guess it could either north or south of there, though.
but anyway, it's a depression. the globals aren't initializing it well (or at least the ones i saw earlier), so all of these ideas are logically derived from imperfect models.. not reliable yet. just encouraging to see that the came to a similar conclusion. after the job they did with .. that's one of the best forecast storms i've ever seen from them.
HF 0547z11july
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Mike N
Verified CFHC User
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Posts: 16
Loc: Tampa, FL
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Thanks Clark. Never knew it was so involved. Now I'll have to get a new calculator to do cosine's...ha ha
Could you explain further about why latitude is based on degrees/minutes/seconds.
After reading it twice I got all the other but still can't figure that one out.
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tpratch
Moderator
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Posts: 339
Loc: Maryland
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Think about a globe.
There are lines starting at "the north pole" that radiate out down to the "south pole". By nature, every single one of those lines is exactly the same length.
Latitude on the other hand, are perpindicular lines which, by nature, ring the entire globe. The further north and south they get from the equator, the shorter in length they are. Accordingly, to permit uniformity and relate them better, the degrees, minutes, and seconds relate to a top-down view of the globe and at what point on them they are. You can't use length since (as mentioned above) latitudinal lines are not equal in length.
Hope I made sense. If not, I'll let someone else tackle that 
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Londovir
Weather Guru
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Posts: 112
Loc: Lakeland, FL
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I always assumed (probably incorrectly so) that the reason longitude and latitude are handled in DMS is simply because longitude and latitude represent positions of angular displacement, and what other natural form for handling angles exists?
IE when TD#5 (here we go again, eh?) is listed as being at 10.8N and 42.9W, it's saying that the storm is parked 10.8 degrees above the equator and 42.9 degrees west of the prime meridian.
Now, it would be equally valid to say that TD#5 was located at 0.188 radians N and 0.749 radians W. But, unless you are a math nerd like me, you could care less about radians. 
For what it's worth, I found the following link to be wonderfully handy in finding distances between 2 pairs of long/lat, as well as educational overall:
Great Circle Calculuations
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Londovir
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danielw
Moderator
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Posts: 3525
Loc: Hattiesburg,MS (31.3N 89.3W)
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Great explanation from all of you.
I just use 65 miles per degree, for a rough guess in the tropics.
There are 3 differrent Lat Long sets used in the USA and at least 1 in the miiitary.
dd mm'sss"-marine and land maps
dd mm.mmm-aircraft
dd.dddd- decimal group-NHC and NWS
Military used the UTM Grid I believe.
Edited by danielw (Mon Jul 11 2005 05:56 AM)
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nl
Storm Tracker
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Posts: 207
Loc: nsb,fl
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so does this look like a stuart hit or vero beach? and how big is she gonna be? 
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Domino
Weather Guru
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Posts: 191
Loc: Makati City, Philippines
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Quote:
so does this look like a stuart hit or vero beach? and how big is she gonna be?
Ask that again in about...a week? The and the folks on here might be good...but they aren't that good
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Domino
Weather Guru
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Posts: 191
Loc: Makati City, Philippines
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Was looking at the precip forecast for my area (Indiana) for the next few days - looks like we are going to be the center of the bullseye for rain. 5 Day Rain Precip Outlook
Looks like 16.5 inches forecasted in the next 5 days? Any idea what kind of accuracy rate this forecast has? 
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superfly
Weather Watcher
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Posts: 33
Loc: New Orleans
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Looks like TD 6 and 7 right behind it too.
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Tazmanian93
Weather Master
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Posts: 495
Loc: Tampa
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Whats the Z name this year
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Don't knock the weather; nine-tenths of the people couldn't start a conversation if it didn't change once in a while.
Go Bucs!!!!!!!!!
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Ed
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danielw
Moderator
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Posts: 3525
Loc: Hattiesburg,MS (31.3N 89.3W)
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http://www.nhc.noaa.gov/aboutnames.shtml
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Domino
Weather Guru
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Posts: 191
Loc: Makati City, Philippines
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Hmm interesting post there about the names. I don't see any contigency plan for running out of names. I thought I had read about one somewhere once...anyone else know if there is a plan?
Edit: maybe they should go right into the Western Northern Pacific list...there are some really bizarre names in there!
Edited by Domino (Mon Jul 11 2005 08:32 AM)
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danielw
Moderator
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Posts: 3525
Loc: Hattiesburg,MS (31.3N 89.3W)
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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
200 AM CDT MON JUL 11 2005
...PRELIMINARY REPORT ON HURRICANE ...
FOR SOUTHWEST/COASTAL ALABAMA...THE EXTREME WESTERN FLORIDA
PANHANDLE...AND INTERIOR SOUTHEAST MISSISSIPPI
DENNIS MOVED ASHORE ABOUT 225 PM SUNDAY AFTERNOON JULY 10 NEAR
NAVARRE BEACH FLORIDA AS A CATEGORY 3 HURRICANE.
HIGHEST WINDS...
NAVARRE...PEAK GUST FROM NE AT 121 MPH AT 219 PM CDT
NEAR PENSACOLA AIRPORT...GUST FROM NW AT 96 MPH AT 247 PM CDT
MARY ESTHER...PEAK GUST 102 MPH
SEMMES...PEAK GUST FROM N AT 44 MPH AT 400 PM CDT
LILLIAN ALABAMA...PEAK GUST 44 MPH AT 129 PM CDT
VALPARAISO (VPS)...PEAK GUST 83 MPH AT 240 PM CDT
PENSACOLA NAS (NPA)...PEAK GUST 58 MPH AT 254 PM CDT
NICEVILLE FLORIDA...PEAK GUST 70 MPH
PENSACOLA (WEAR)...PEAK GUST FROM W AT 53 MPH
MOBILE (USS ALABAMA)...PEAK GUST FROM N AT 77 MPH AT 248 PM CDT
LOXLEY ALABAMA...PEAK GUST FROM N AT 50 MPH AT 245 PM CDT
CRESTVIEW (CEW)...PEAK GUST FROM SE AT 58 MPH AT 320 PM CDT
MOBILE (MOB)...PEAK GUST FROM N AT 48 MPH AT 100 PM CDT
MOBILE BROOKLEY (BFM)...PEAK GUST FROM N AT 44 MPH AT 1158 AM CDT
CRESTVIEW (CEW)...PEAK GUST FROM SE AT 58 MPH AT 320 PM CDT
PENSACOLA (PNS)...PEAK GUST FROM W AT 93 MPH
TWO DAY RAINFALL TOTALS (ENDING AT 1159 PM CDT JULY 10)...
MOBILE (MOB) 3.71
SEMMES 4.25
CRESTVIEW (CEW) 3.22
BAKER 4.22
BREWTON 3.04
FOWL RIVER 3.65
MILLIGAN 4.26
MILTON 7.01
MOLINO 4.23
MILLERS FERRY 3.82
MUNSON 6.93
FISH RIVER 2.18
BREWTON 3.04
PRELIMINARY SURGE VALUES...
DESTIN EAST PASS 4.6 FEET
POINT CADET 3.5 FEET
CEDAR POINT 3.5 FEET
PERDIDO PASS 4.1 FEET
SANTA ROSA SOUND 5.0 FEET
PENSACOLA 5.5 FEET
DAUPHIN ISLAND 4.0 FEET
DAMAGE...EARLY INDICATIONS ARE THAT HURRICANE CAUSED QUITE A
BIT OF DAMAGE IN THE COASTAL COUNTIES OF ESCAMBIA...SANTA ROSA AND
OKALOOSA IN FLORIDA. MOST INLAND COUNTIES HAD MANY TREES AND POWER
LINES BLOWN DOWN. HIGHWAY 98 BETWEEN FORT WALTON BEACH AND DESTIN
WAS AGAIN WASHED OUT BY HIGH WATER. POSSIBLE TORNADOES WERE REPORTED
IN SANTA ROSA COUNTY IN FLORIDA AND IN ESCAMBIA COUNTY IN ALABAMA.
STREET FLOODING WAS REPORTED ACROSS MOST OF SOUTHWEST ALABAMA.
NO INJURIES OR DEATHS WERE REPORTED.
http://www.srh.noaa.gov/data/MOB/PNSMOB.0507110702
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TAZMAN
Weather Watcher
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Posts: 48
Loc: Clermont, Fl
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Found this to be another very informative site !
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/home.rxml
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javlin
Weather Master
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Posts: 410
Loc: Biloxi,MS
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Looking at the values Dan if you HAD to get but a cane this might be one of those you take.I am happy for the residents there that a possible EWR might of happen just before it came in.
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lonny307
Unregistered
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As per most models it takes Emily near the SE coast. I can't believe there is just about no shear ahead of these systems. I don't remember any year let alone July where they can track that far out without much shear. Well here we go again.
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Rusty Trombone
Unregistered
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I may REALLY have to watch this one. http://www.nhc.noaa.gov/refresh/graphics_at5+shtml/025038.shtml?5day
will this hit your house? can we go ahead and get a prediction from you?.... since you did so well with and all
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