118 F: heat index around the dinner hour, just 1 degree shy of the Twin Cities all-time heat index record (119 in 1966).
82 dew point at MSP Tuesday (on the hour at MSP International Airport).
84 dew point (unofficial, reported at 3:21 and 3:27 pm). The MN Climate Office will determine if 84 is the new MSP record.
88 dew point at Moorhead yesterday, setting a new all-time Minnesota state record.
134 F. heat index at Moorhead yesterday, setting a new record for the hottet heat index ever reported in Minnesota.
Relief Is Less Than 24 Hours Away. Models bring the dew point into the upper 50s and low 60s Thursday, meaning less than HALF as much water in the air than the past few days. But first we have to muddle through more extreme heat today: highs in the upper 90s + dew point in the mid to upper 70s = heat index of 105-115. After a brief break on Thursday the heat index may return to the 100-105 range over the weekend.
Record-Shattering. Wikipedia has already updated the numbers taking yesterday's new records into account: a new state record for the highest dew point (88 at Moorhead yesterday and Madison on Monday). Also, a new record for the highest heat index ever recorded in Minnesota: 134 at Moorhead yesterday. Unbelievable.
* Dew Point hit 82 on the hour (which may be the final, "official" reading at MSP). But in-between hours the DP rose as high as 84 F. According to a contact at MSP International, "The MN Climate Office will have to review and determine if 84 F. stands. In the meantime it's 82F, since it was on an hourly METAR." Bottom line: dew point is measured differently than air temperature. If the high reaches 97 at 3:30 it counts as a high of 97. Makes sense to me. But the dew point monitoring equipment works differently - if the dew point is 82 at 3:00 pm at 84 at 3:20 pm the official dew point reading is 82. Go figure. Again, it'll be up to climatologists at the University of Minnesota to determine what the maximum dew point really was yesterday. It SHOULD be 84, but due to procedure issues and different monitoring equipment, it may go down into the record books as 82, which is still an all-time record.
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 400 PM CDT TUE JUL 19 2011 ...UNOFFICIAL DEW POINT RECORD SET IN THE TWIN CITIES TODAY... THE DEW POINT TEMPERATURE AT THE MINNEAPOLIS ST PAUL INTERNATIONAL AIRPORT WAS 82 DEGREES ON THE 3 PM AND 4 PM OBSERVATION. THIS IS THE HIGHEST DEW POINT TEMPERATURE REPORTED ON AN HOURLY OBSERVATION AT THE MINNEAPOLIS ST PAUL INTERNATIONAL AIRPORT SINCE HOURLY DEW POINT RECORDS BEGAN IN 1945. THE PREVIOUS HOURLY DEW POINT RECORD WAS 81 DEGREES...WHICH WAS SET ON JULY 30TH 1999. A DEW POINT OF 81 DEGREES WAS ALSO REPORTED AT THE AIRPORT ON SUNDAY...MONDAY...AND EARLIER TODAY /JULY 17-19/. THE MINNESOTA STATE CLIMATOLOGY OFFICE IS THE OFFICIAL SOURCE OF DEW POINT RECORDS ACROSS THE STATE. THIS NEW RECORD WILL BE CONSIDERED UNOFFICIAL UNTIL IT IS CONFIRMED BY THE STAFF AT THE STATE CLIMATE OFFICE.
* Heat index reaches 118. All-time record for heat index at MSP is 119, set in 1966!
"Supercell" Here is a pretty amazing YouTube time-lapse of a supercell thunderstorm that blew up over Amidon, North Dakota on Tuesday: "Developing supercell in western ND just NW of Amidon, ND. Several shots of cloud to ground lightning too."
A LARGE RIDGE OF HIGH PRESSURE IN THE UPPER LEVELS OF THE ATMOSPHERE REMAINS IN PLACE ACROSS THE CENTRAL U.S...KEEPING HOT TEMPERATURES IN PLACE. THE HOT TEMPERATURES COMBINED WITH HIGH RELATIVE HUMIDITY WILL CREATE DANGEROUS HEAT INDICES WELL ABOVE 100 DEGREES OVER A LARGE PORTION OF THE NATION. THE UPPER-LEVEL RIDGE WILL EXPAND EASTWARD THIS WEEK. BY MIDWEEK...THE HOT TEMPERATURES WILL BEGIN TO SPREAD INTO THE EASTERN STATES...WITH HIGH TEMPERATURES IN THE MID TO UPPER 90S ARRIVING IN THE MID-ATLANTIC STATES AS SOON AS WEDNESDAY. HIGH TEMPERATURES NEAR 100 DEGREES WILL BE POSSIBLE BY THURSDAY ACROSS MUCH OF THE MID-ATLANTIC STATES AND PARTS OF THE SOUTHEAST U.S. THESE TRIPLE-DIGIT TEMPERATURES ARE FORECAST TO REMAIN IN PLACE ACROSS THE EASTERN U.S. THROUGH THE WEEKEND.
...SELECTED HIGH HEAT INDEX VALUES FROM MONDAY JUL 18 2011... ...ILLINOIS... FREEPORT 124 MOLINE 112 RANTOUL 111 SAVANNAH 110 QUINCY 106 TAYLORVILLE 105 ...INDIANA... GRISSOM AFB 110 LAFAYETTE 106 INDIANAPOLIS 101 ...IOWA... KNOXVILLE 131 NEWTON 129 ATLANTIC 126 COUNCIL BLUFFS 126 ORANGE CITY 123 ALGONA 122 ANKENY 122 SPENCER 118 SIOUX CITY 117 WATERLOO 116 DES MOINES 114 ...KANSAS... LAWRENCE 110 TOPEKA 108 GREAT BEND 107 SALINA 107 WICHITA 107 HAYS 106 HILL CITY 106 ...MICHIGAN... LENAWEE COUNTY ARPT 107 ANN ARBOR 105 HILLSDALE 105 JACKSON 105 ...MINNESOTA... MADISON 124 HUTCHINSON 123 AUSTIN 121 REDWOOD FALLS 119 ROCHESTER 118 MARSHALL 117 MINNEAPOLIS 117 ST JAMES 117 NEW ULM 114 PIPESTONE 114 ...MISSOURI... KIRKSVILLE 107 WHITEMAN AFB 106 KANSAS CITY 105 ...OKLAHOMA... SHAWNEE 111 CHANDLER 109 ARDMORE 108 OKLAHOMA CITY 106 PONCA CITY 106 STILLWATER 106 ...NEBRASKA... OFFUTT AFB 117 TEKAMAH 117 HEBRON 115 FALLS CITY 113 LINCOLN 111 ALBION 110 KEARNEY 107 ...SOUTH DAKOTA... CHAMBERLAIN 115 MITCHELL 115 ABERDEEN 114 HURON 113 PIERRE 113 SIOUX FALLS 111 WATERTOWN 109 ...TEXAS... DALLAS 108 PARIS 106 TYLER 105 ...WISCONSIN... WATERTOWN 119 BOSCOBEL 117 LONE ROCK 115 MADISON 114 PRAIRIE DU CHIEN 114 VOLK 114 EAU CLAIRE 113 STEVENS POINT 110 MILWAUKEE 107
* More details on the heat from NOAA NCEP here.
Flash Flooding In New Orleans. A few details:
- An early Monday morning deluge that dumped nearly 7 inches on parts of the West Bank of New Orleans, LA has caused major street flooding.
- The flooding is heaviest east of the Harvey Canal, especially in Terrytown, which got 5 to 6 inches of rain in an hour starting at 4 a.m.
- From midnight to 7 a.m., the following rainfall totals were recorded: Planters Pump Station in Gretna, 6.9 inches; Oakwood Drive and Carol Sue Ave. in Terrytown, 6.6 inches; Gretna Courthouse, 4.7 inches; Marrero, 2.9 inches; Westwego Pump Station, 2.3 inches; and Bridge City, 1.7 inches.
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Paul's Conservation Minnesota Outlook for the Twin Cities and all of Minnesota:
WEDNESDAY NIGHT: Tropical evening, a few T-storms possible, then turning slightly less humid late. Low: 69
• New England and the Mid-Atlantic experienced the largest increase in extreme precipitation frequency. New England and the Mid-Atlantic saw storms with extreme precipitation levels increase in frequency by 61 percent and 42 percent, respectively. At the state level, Rhode Island, New Hampshire, Massachusetts, Vermont, New York and Louisiana all saw extreme precipitation events increase in frequency by more than 50 percent. In the contiguous United States, 40 states experienced a statistically significant trend toward increasingly frequent storms with extreme precipitation. Only one state (Oregon) showed a statistically significant decline in frequency of storms with extreme precipitation.
Is Mitt Romney Regretting His Global Warming Declaration? The Atlantic Wire has more: "Count us among those who were surprised in early June when Mitt Romney came out officially as a lonely global warming believer in a climate-change denying GOP field. Since then, the mercurial frontrunner has had to rebuff a broadside launched by the Rush Limbaugh conservative base and tacitly accept praise (a kiss of death) from Al Gore on his sensible position. So Mitt's campaign, eager only to focus on jobs-related issues, appears to be minimizing the matter. Last Thursday, in town hall held in Derry, New Hampshire, Romney argued that carbon emissions shouldn't be regulated as pollutants by the Environmental Protection Agency. The candidate's admission that "I don't think carbon is a pollutant in the sense of harming our bodies" was caught on tape by Think Progress and, yesterday, Politico reignited debate about his limited climate change support. The remark also revived the long-running liberal charge that Mitt Romney paradoxically believes in global warming yet won't do anything to help combat it."