The cold front passed early yesterday morning, behind it we picked up 0.05" of rainfall.Yesterday morning low was 58°. We did managed to squeeze out some sunshine with temperatures only topping out at 70°. We'll remain dry and look forward to a pleasant weekend. This mornings low dropped to a chilly 50°.
Temperatures will climb back up closer to 80° for Monday before another cold front arrives Monday night into Tuesday morning. This will bring the threat for some showers and possibly even some thunderstorms. Some much cooler air spills in behind it that will keep steady tuesday afternoon highs into the low to mid 60s and drop Tuesday night, Wednesday morning lows into the mid 40s. Areas away from the city, could hit upper 30s Wednesday Morning.
As I've stated in previous blogs in each September over the past 10 years Indianapolis has recorded a high temperature in the 60s. Also, in 8 of those, we've recorded a 40° low temperature. There were no 40s in 2008 and 2009.
1) 2011: September 6th-High of 68°
September 15th-Low of 46°
2) 2010: September 26th-High of 65°
September 4th-Low of 48°
3) 2009: September 25th-High of 67°
4) 2008: September 15th-High of 67°
5) 2007: September 15th-High of 64°
September 12th-Low of 49°
6) 2006: September 13th-High of 66°
September 19th-Low of 47°
7) 2005: September 29th-High 65°
Low 46°
8) 2004: September 29th- High 68°
Low 48°
9) 2003: September 19th-High 68°
Low 48°
10)2002: September 22nd- High 66°
Low 48°
As we go through a change in seasons, the weather pattern is changing. During this time of year, that means our chances of hitting temperatures 80+ are getting lower and lower. Below, I've broken temps down into a chart for the year showing the frequency of temps for each month in a certain temperature range. The numbers in the chart represents the number of days a temperature has been recorded in a certain temperature range. The red numbers in each box represents high temperatures. Low temperatures in parenthesis are in light blue.
For example, in January, we recorded 1 day with highs temperatures in the teens while we recorded 9 days with low temperatures in the teens. In February, we recorded 0 days with a high in the teens but 3 days with lows in the teens.
| TEENS | 20s | 30s | 40s | 50s | 60s | 70s | 80s | 90s | 100s | |
| JAN | 1 (9) | 4 (12) | 7 (9) | 9 (0) | 9 (1) | 1 (0) | ----- | ----- | ----- | ----- |
| FEB | 0 (3) | 1 (10) | 9 (13) | 9 (2) | 8 (0) | 2 (0) | ----- | ----- | ----- | ----- |
| MAR | ----- | 0 (4) | 1 (7) | 3 (4) | 4 (11) | 9 (5) | 7 (0) | 7 (0) | ----- | ----- |
| APR | ----- | 0 (1) | 0 (7) | 0 (14) | 8 (8) | 13(0) | 8 (0) | 1 (0) | ----- | ----- |
| MAY | ----- | ----- | ----- | 0 (3) | 0 (15) | 2 (9) | 14(4) | 12(0) | 3 (0) | ----- |
| JUN | ----- | ----- | ----- | 0 (1) | 0 (11) | 1 (10) | 4(8) | 13(0) | 10(0) | 2 (0) |
| JUL | ----- | ----- | ----- | ----- | ----- | 0 (7) | 0 (23) | 3 (1) | 21(0) | 7 (0) |
| AUG | ----- | ----- | ----- | ----- | 0 (6) | 0 (22) | 5 (3) | 18(0) | 8 (0) | ----- |
| SEP | ----- | ----- | ----- | ----- | 0 (6) | 0 (4) | 7 (4) | 8 (0) | ----- | ----- |
| TTL | 1 (12) | 5 (27) | 17(36) | 21(24) | 29(58) | 28(57) | 45(42) | 62(1) | 42(0) | 9 (0) |
So far this year we've had 9 days with high temps in the 100s, 51 days 90+, 113 days 80+, and 158 days 70+.
We had 58 mornings this year with lows in the 50s and 57 days in the 60s. We've had 42 days with lows in the 70s, over half of those in July. We also had our highest low temperature this century in the 80s in July. This hasn't occured since the late 1900s.
Its unlikely we'll hit the 90s again but the latest 90° day on record is October 8, 2007 with a temperature of 91° so you can't entirely rule that possibility out.
So far, we've had 9 days this year with temperatures 100+, 7 of those occured in July. This is the 3rd most 100° days in one year. There was 10 in 1934 and 12 in 1936.
SEPTEMBER 2012
We started the month on a wet note. Remnants from Isaac brought nearly 2" of beneficial rain to the city and another system brought us even more than that afterwards. We picked up 2.71" of rainfall on September 7th. That marked a record for most rain for that date. The previous record was 1.19" set back in 1942.
We added 0.24" on the 8th on top of that bringing us a 2 day rainfall total of 2.93". This put an end to a total of 4.93" of rain in the first 8 days of the month. This was the 4th wettest start to a first week of September since 2003 when we picked 7.23" Sept. 1-7. That record was the #1 most wettest start.
This ate a big chunk of the deficit bringing it down to nearly 2.50". But a 5 day stretch of dry weather has brought that deficit back up to over 3" below normal. After picking up a 2 month total of over 10" of rain, this was good enough to drop both burn bans and water burns/restrictions. Also, this is easing drought conditions and we went from being in an Extreme Drought to now being in a Moderate Drought. About 25% of the state (Southern Indiana) remains in a Severe Drought. The latest maps are below.
In terms of temperatures, our highest temperature so far this month is 88° recorded back on the 4th while the lowest high temperature so far is 73° on the 8th.
The lowest low temperature so far this month is 52° recorded on the 10th while the warmest low temperature so far this month is 70° on the 14th.
The average high temperature so far this month through the 14th is 79.9°.
The average low temperature so far this month through the 14th is 63.2°
The average monthly temperature so far through the 14th is 71.6°
Since the beginning of the month we've lost over a half an hour of daylight and around 2.5 hrs since June 20th. As the days continue to get shorter, we'll lose another half an hour for the remainder of the month bringing us 3 hrs of daylight lost since June 20th.
This months High/Low/Precip Observations so far
Sept 1st--82/75/0.38"
Sept 2nd--77/72/1.53"
Sept 3rd--82/71/0.01"
Sept 4th--88/72/Trace
Sept 5th--83/66/0.06"
Sept 6th--87/64/NONE
Sept 7th--83/66/2.71"
Sept 8th--73/56/0.24"
Sept 9th--75/54/NONE
Sept 10th-76/52/NONE
Sept 11th-78/56/NONE
Sept 12th-83/57/NONE
Sept 13th-81/66/NONE
Sept 14th-70/58/0.05"
| This Week |
Last Week |
Difference | |
|---|---|---|---|
| Abnormally Dry |
100% | 100% | UNCHANGED |
| Moderate Drought |
88.32% | 88.38% | -0.06% |
| Severe Drought |
26.83% | 54.67% | -27.84% |
Here's the updated deficit chart in Indiana
| Location | Year to Date Precipitation (through Sept. 14) |
Departure from Average | Precip since Sept 1 | Departure from Average |
| Indianapolis | 27.47 | - 3.31 | 4.98 | +3.53 |
| Evansville | 22.64 | - 9.70 | 4.67 | +3.25 |
| Lafayette | 20.54 | - 6.28 | 3.13 | +1.86 |
| Terre Haute | 20.46 | -12.61 | 2.92 | +1.13 |
| Muncie | 22.65 | - 6.73 | 3.73 | +2.26 |
| Bloomington | 20.53 | -14.21 | 4.23 | +2.68 |
| Shelbyville | 21.15 | -10.67 | 4.43 | +2.89 |
| Ft. Wayne | 21.65 | - 6.52 | 2.79 | +1.46 |
| South Bend | 25.96 | - 0.95 | 1.38 | -0.26 |
| Indy - Eagle Creek | 26.81 | - 2.89 | 4.68 | +3.63 |
THIS WEEK
While temperatures here have dropped from last Friday then sloooowly warmed up from low 70s at the start of the week to low 80s Wednesday and Thursday, its becoming chiller in the U.S. and some snow has fallen too.
Lets shift the focus out to Denver, Colorado. First off, they've picked up 0.96" of rain earlier this week. The most 2 day rainfall since early October. Also, 0.95" of that fell on one day, September 12th. This is the most rain in one day the city has seen for the date since September 12, 1875 when 0.91" fell. Denver has now picked up 1" of rain this month, so far 0.56" above normal for month. This brings the years total to 6.40", 5.40" below normal 11.80". You'll have to go to Southwest Colorado to the higher elevations in the Pikes Peak to find 6" of snow. Denver's first snowfall can vary. Last year, they picked up a trace on October 8th, recorded a half inch on October 25th, and 8" the day after. The earliest snowfall for Denver occured September 3, 1961 (4.2").
The coolest temperatures this week can be found in the Pacific Northwest, Rockies, Central Plains, and stretching up to the upper Mississippi Valley with lows in the 20s and 30s. There was a 19° low in West Yellowstone, Montana on Thursday but a chillier 16° in Stanley, Idaho on Wednesday. The hot spot was in Death Valley, CA. They recorded as high as 119° this month not once but TWICE back to back, on the 8th and 9th. The avg high so far this month is 113° which is 6° above the normal avg high of 107. Only about 0.84" of precip for the year, none this month.
Death Valley has been named the hottest spot on Earth by WMO (World's Meterological Organization). They believe the thermometer that was used to record Libyans 136.4° temperature reading was a unreliable observation and was actually off 5° to a reading of 131°. This means Death Valleys 136° reading on July 10, 1913 is now the hottest temperature ever recorded in Earth's weather history since record keeping began in the mid to late 1800s.
Some record lows set this week:
Finney, TX September 14: 37° Previous Record-40° (1989) Difference: -3°
Honolulu, HI September 13: 32° Previous Record-65° (1919) Difference: -33°
Lea, NM September 12: 43° Previous Record-54° (1960) Difference: -11°
Collin, TX September 11: 46° Previous Record-59° (2004) Difference: -13°
Mobile, AL September 10: 61° Previous Record-62° (2011) Difference: -1°
Some record highs set this week:
San Diego, CA September 14: 106° Previous Record-99° (1971) Difference: -7°
Cameron, TX September 13: 94° Previous Record-94° (1938) Difference: 0° (TIED)
Cheyenne, CO September 12: 102° Previous Record-100° (1956) Difference: +2°
Dakota, MN September 12: 94° Previous Record-88° (2011) Difference: +6°
Miami, FL September 11: 93° Previous Record-90° (1997) Difference: +3°
Carter, MT September 10: 101° Previous Record-99° (1998) Difference: +2°
Over the past 8 days (September 7-14), 729 total records have been set for maximum warmest highs and minimum warmest high temperatures. There were a total of 527 records set for warmest low temperatures and coolest low temperatures.
Allergy Forecast
For the easily enable sneezers, there is a reason why your sneezing more and its not just simply because of the change in seasons. Because we've had a such a mild hot year, plants have produced a lot more pollen than normal. Ragweed and Mold will be our biggest threats this fall heading into winter. Typically, your allergy season starts about mid august and ends somewhere around early or mid October when some states begin to have their first frost. This year, it could linger longer into November, for some. A combination of less snow last winter, early mild spring, and record breaking summer heat, all contributed to the production of more potent pollen, particularly ragweed now. If you haven't already done so, than you need to start taking your allergy medications NOW. Your body has a better shot at fighting off these allergies, the earlier you start. You should also keep taking them weeks after the first frost. The reason why is because, not everyone has already had their first frost and winds can blow these pollen spores several states over.
For most in the nation, pollen count will probably remain in the medium to medium-high range for the rest of the month. Some of the cooler spots will be in the low to low-medium range.
UPCOMING....
A signal of a weather pattern change will bring much cooler air into the city. The coolest weather seen in months. We may hit our first 30° and 40° low this month. Most of the remaining 16 days left of the month will be below normal. The development of a negative North Altantic Ocillation will bring us temperatures more typical for mid October in the coming days. The coolest since early June and early to mid May. Latest European Weeklies suggest that temperatures will be up and down for the next month. With several troughs moving through the temperatures will not stay consistent. This will also bring several chances for showers and some thunderstorms. When two air masses clashes then this brings about severe weather. We'll see how this plays out but the balance of the remainder of the months temperatures will be in the 60s and 70s.
Here's a list of "Chilling" Facts:
- Last Subzero Low-February 10, 2011 (-1°)
- Last Single Digit Low-February 9, 2011 (7°)
- Last low temp in teens-February 13, 2012 (18°)
- Last low temp in 20s-April 11, 2012 (29°)
- Last low temp in 30s-April 27, 2012 (35°)
- Last low temp in 40s-June 2, 2012 (48°)
- Last high temp in the 50s-April 28, 2012 (52°)
- Last high temp in the 40s-March 9, 2012 (45°)
- Last high temp in the 30s-March 3, 2012 (38°)
- Last high temp in the 20s-February 11, 2012 (25°)
- Last high temp in the teens-February 13, 2012 (19°)
- Last single digit high-February 15, 2009 (7°)
- Last Subzero High-January 18, 1994 (-4°)
- Earliest First Freeze-September 30, 1899 (30°) & 1993 (33°)
- Latest First Freeze 32° or lower-November 8, 1956
- Latest First Hard Freeze 28° or lower-December 3, 2004
- Avg First Frost-October 7 (36° or lower)
- Avg First Freeze-October 16(32° or lower)
- Avg First Hard Freeze-October 30(28° or lower)
- Last years First Freeze-October 30, 2011 (31°:)
- Last years First Hard Freeze-November 11, 2011 (27°)
- Avg First Snowfall-November 19 (0.01 or higher)
- Earliest First Snowfall (0.01 or higher)-October 18, 1989
- Last years First Snowfall (0.01 or higher)-November 29, 2011 (0.2")
| Colts vs Vikings @ 1PM |
Fall Begins 10:49AM |
Colts vs Jaguars @ 1PM |
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| SEPT. 15 | SEPT. 16 | SEPT. 17 | SEPT. 18 | SEPT. 19 | SEPT. 20 | SEPT. 21 | SEPT. 22 | SEPT. 23 | SEPT. 24 |
| TODAY | SUNDAY | MONDAY | TUESDAY | WEDNESDAY | THURSDAY | FRIDAY | SATURDAY | SUNDAY | MONDAY |
 Mostly |
Sunny |
PM |
AM |
Partly |
PM Showers |
Partly |
Mostly |
Mostly |
Mostly |
| Sunny | T'Storms | Showers | Sunny | & T'Storms? | Cloudy | Sunny | Sunny | Sunny | |
| WEATHER | PATTERN | CHANGES | LEADING | TO MUCH | CHILLIER | NIGHTS | AHEAD | ||
| 75 | 77 | 79 | 64 | 65 | 73 | 71 | 68 | 72 | 74 |
| 52 | 57 | 59 | 46 | 49 | 53 | 50 | 50 | 53 | 54 |
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