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July 2023


Stormlover74
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23 hours ago, forkyfork said:

we get endless uhi posts whenever newark breaks a record but nobody mentions how we turned the entire great plains into a parking lot in the 30s

It's crazy to see how this urban heat island effect keeps growing and even affecting places hundreds of miles from any city, such as McKean County, Pennsylvania.

image.png.969ef4ffa10d6d771c40ee420b131dc9.png

 

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1 hour ago, TheClimateChanger said:

It's crazy to see how this urban heat island effect keeps growing and even affecting places hundreds of miles from any city, such as McKean County, Pennsylvania.

image.png.969ef4ffa10d6d771c40ee420b131dc9.png

 

We are in part of the country where NYC UHI became established in the early 1900s and expanded to the suburbs 1950-1980. So all of our warming since 1980 is CC. Places like Phoenix and Las Vegas have seen the double whammy of UHI expansion and CC since 1970.  UHI around NYC was pretty strong by the late 1800s.

 

Data for August 1, 1896 through August 31, 1896
Click column heading to sort ascending, click again to sort descending.
State
Name
Station Type
Number of Days Min Temperature >= 70 
NY NY CITY CENTRAL PARK WBAN 16
NY BRONX COOP 12
NJ NEWARK COOP 11
NJ PATERSON COOP 11
NJ PLAINFIELD COOP 10
NY WORLD TRADE CENTER WBAN 10
NJ ELIZABETH COOP 9
CT BRIDGEPORT COOP 9
NY WEST POINT COOP 7
NY PORT JERVIS COOP 6
NY SETAUKET STRONG COOP 6
CT MIDDLETOWN 4 W COOP 6
CT NEW LONDON COOP 5
CT COLCHESTER 2 W COOP 5
NY BRENTWOOD COOP 4
CT WATERBURY ANACONDA COOP 4
CT NORWALK COOP 3
NJ CHARLOTTEBURG RESERVOIR COOP 1
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Some showers or thundershowers are likely tomorrow. Some of the thunderstorms could be severe. Afterward, a fair and dry weekend will follow.

An extreme heat event continues to grip the Southwest. Cities such as Las Vegas, Phoenix, and Tucson could see readings continue to rise toward or above their record daily levels over the next few days.

Phoenix reached a sizzling 119° today on Day 21 of its longest heatwave on record. That smashed the daily record of 114° from 1978. In addition, Phoenix had a mean temperature of 105° or above for the fifth time this month. No year had more than two such days.

The ENSO Region 1+2 anomaly was +3.4°C and the Region 3.4 anomaly was +1.1°C for the week centered around July 12. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +2.80°C and the ENSO Region 3.4 anomaly has averaged +0.97°C. El Niño conditions have developed and will likely continue to strengthen through at least the summer. The probability of an East-based El Niño event has increased.

The SOI was -18.65 today.

The preliminary Arctic Oscillation (AO) was +1.035 today.

On July 18 the MJO was in Phase 3 at an amplitude of 0.509 (RMM). The July 17-adjusted amplitude was 0.455 (RMM).

Based on sensitivity analysis applied to the latest guidance, there is an implied 75% probability that New York City will have a warmer than normal July (1991-2020 normal). July will likely finish with a mean temperature near 79.1° (1.6° above normal).

 

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6 minutes ago, Tatamy said:

Mt. Holly issues severe thunderstorm watch for all of its PA counties.

Western NJ is included too.  Nasty looking line.  Haven't seen one this well formed in quite some time.  I'll have the flashlights and clothes ready in case I need to hop out of bed quickly.  Hopefully it weakens some.

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Records

 

Highs:

 

EWR: 102 (1980)
NYC: 101 (1980)
LGA: 101 (1991)

Lows:

EWR:   59 (1997)
NYC: 55 (1890)
LGA: 61 (1997)

 

Historical:

 

1915: A record high temperature of 115 degrees occurred in Yosemite Valley at the National Park Headquarters, California (around 4,000 feet elevation). This reading was the warmest day in a streak of 7 consecutive days of 110 degrees or higher at Yosemite Valley from the 19th through the 25th.

1930 - The temperature at Washington D.C. soared to an all-time record of 106 degrees. The next day Millsboro reached 110 degrees to set a record for the state of Delaware. July 1930 was one of the hottest and driest summers in the U.S., particularly in the Missouri Valley where severe drought conditions developed. Toward the end of the month state records were set for Kentucky with 114 degrees, and Mississippi with 115 degrees. (David Ludlum)

1934 - The temperature at Keokuk, IA, soared to 118 degrees to establish a state record. (The Weather Channel)

1953 - Twenty-two inches of hail reportedly fell northeast of Dickinson, ND. (The Weather Channel)

1986 - The temperature at Charleston, SC, hit 104 degrees for the second day in a row to tie their all-time record high. (The Weather Channel)

 

1977: A flash flood hits Johnstown, Pennsylvania, on this day in 1977, killing 84 people and causing millions of dollars in damages. This flood came 88 years after the infamous Great Flood of 1889 that killed more than 2,000 people in Johnstown. 

1987 - Thunderstorms produced severe weather across Minnesota, Wisconsin and Michigan. Thunderstorms produced wind gusts to 87 mph at Mosinee, WI, and strong thunderstorm winds capsized twenty-six boats on Grand Traverse Bay drowning two women. Thunderstorms produced nine inches of rain at Shakopee, MN, with 7.83 inches reported in six hours at Chaska, MN. Thunderstorms in north central Nebraska produced hail as large as golf balls in southwestern Cherry County, which accumulated to a depth of 12 inches. (The National Weather Summary) (Storm Data)

1988 - The temperature at Redding, CA, soared to an all-time record high of 118 degrees. Showers and thunderstorms produced much needed rains from New England to southern Texas. Salem, IN, was deluged with 7.2 inches of rain resulting in flash flooding. (The National Weather Summary)

1989 - Showers and thunderstorms in the Middle Atlantic Coast Region soaked Wilmington, DE, with 2.28 inches of rain, pushing their total for the period May through July past the previous record of 22.43 inches. Heavy rain over that three month period virtually wiped out a 16.82 inch deficit which had been building since drought conditions began in 1985. Thunderstorms in central Indiana deluged Lebanon with 6.50 inches of rain in twelve hours, and thunderstorms over Florida produced wind gusts to 84 mph at Flagler Beach. (The National Weather Summary) (Storm Data)

 

2005: Hurricane Emily made landfall in northern Mexico. When the central pressure fell to 29.43 inches of mercury, and its sustained winds reached 160 mph on the 16th, Emily became the strongest hurricane ever to form before August, breaking a record set by Hurricane Dennis just six days before. It was also the earliest Category 5 hurricane ever recorded in the Atlantic basin, beating Hurricane Allen's old record by nearly three weeks.

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3 hours ago, Will - Rutgers said:

some infrequent heat lightning i’m storm chasing from my balcony, line just about entering hunterdon.  i assume this line is the entirety of the friday storm threat

5.32 of rain so far this month at Rutgers 

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