June 2010 Central Indiana Climate Summary

Central Indiana
June 2010 Climate Summary
7th Warmest on record at Indianapolis
3rd Wettest on record at Indianapolis
High temperatures started in the mid and upper 80s right away to begin the month with lows only falling into the mid 60s for most locations. In the wake of a cold frontal passage early on the 6th, highs fell back into the 70s through the 8th as a cooler and less humid airmass arrived in central Indiana. As southerly flow reestablished by the 9th, high temperatures recovered back into the 80s. In fact, high temperatures would not fall back below 80 degrees for most of the region again until the 29th as a very warm and humid airmass would remain not only across central Indiana, but much of the Midwest for the bulk of the month. The first 90 degree day of the year came for much of the region on the 11th, with several to follow as the month progressed. Indianapolis made it to 90 degrees officially five times during the month. The high exceeded 80 degrees on 25 of the 30 days at Indianapolis, and was at or above 85 degrees on 15 of the 30 days during June.
After the 10th, low temperatures largely remained at or above 65 degrees for most of the rest of the month as the humid airmass and plenty of moisture from rainfall through the month kept temperatures higher at night. The low remained at or above 70 degrees at Indianapolis eight times during the month, and at or above 65 degrees 25 of the 30 mornings. The average minimum temperature for June of 67.1 degrees was 5.8 degrees above normal, and made for the 7th warmest June on record for minimium temperatures.
This was the seventh warmest June on record in terms of average temperatures at Indianapolis, and the warmest June on record since June 1952 when the average temperature topped out at 76.5 degrees.
June 2010 Avg Temp
June 2010 Difference from normal
Lowest Temperature
92 on 26
56 on 30
91 on 18
53 on 30
89 on 23 and 26
50 on 30
Terre Haute
92 on 23 and 26
55 on 7
91 on 23 and 26
55 on 7 and 30
91 on 23 and 26
54 on 30
Indy – Eagle Crk.
91 on 23 and 26
56 on 10
At Indianapolis, there were 3 days with below normal average temperatures and 27 days with above normal average temperatures.
June 2010 was the 7th warmest in the Indianapolis area since 1871.
Monthly rainfall during June in central and southern Indiana varied from 4 inches to over 15 inches.   Nearly 90% of the area received 6 to more than 15 inches...with 1/3 of the area receiving more than 10 inches. This was 150% to more than 600% of normal.  Typically central Indiana receives around 11 inches of rain during the summer. This June 1/3 of central Indiana received a summer’s worth of rain in less than four weeks.
A seemingly endless parade of storms continually dumped rain, sometimes heavy, on central Indiana. The longest “dry spell” between storms was less than 3 days. Because May was on the wet side, the widespread nature of this rainfall had almost an immediate impact on area rivers. Most rivers reached bankfull levels early in June and continually rose higher after each rain. Because the rainfall was distributed over a four week period, historic river flooding as experienced in June 2008 did not occur. Flooding occurred along almost every river in central Indiana.   River flood levels were the highest since late May 2009.   Flooding along the White and Wabash Rivers in southwest Indiana and southeast Illinois continued into July.
The worst flooding during the month occurred on the 22nd. Portions of central Indiana received up to 4 inches of rain during the night of the 21st. Because this area had already received nearly 2 inches of rain in the previous 72 hours, serious flash flooding occurred in portions of Clinton and Hendricks Counties. Nearly the entire town of Edna Mills in northeast Clinton County was flooded including State Road 26.   In Hendricks County, two small dams located in the White Lick Creek drainage area were compromised. This caused the evacuation of a nearby mobile home park located along White Lick Creek just downstream of the dams. County and state roads near the creek were flooded in the Avon…Plainfield and Mooresville areas. High water affected the Crystal Bay area near Hummel Park in Plainfield.
The abundant and prolonged rainfall impacted the agricultural community.   Fields that did not drain properly had uneven growth patterns. The nearly constant high humidity levels delayed wheat harvest and hay cutting. Some agricultural lands will remain fallow this season because they will not dry out in time to plant a crop.
June 2010 Precipitation
June 2010 Difference from Normal
Wettest Day
Longest Dry Stretch
1.95” on 21
2 days 16-17, 25-26, 29-30
2.36” on 22
2 days 3-4, 16-17, 29-30
2.03” on 14
2 days 16-17, 25-26, 29-30
Terre Haute
1.48” on 19
2 days 16-17, 20-21, 25-26, 29-30
1.71” on 27
3 days 16-18
3.94” on 14
2 days 16-17, 25-26, 29-30
Indy – Eagle Crk.
1.92” on 21
2 days 16-17, 25-26, 29-30
(*) – Precipitation Data for Shelbyville (KGEZ) is missing for June 22.
June 2010 was the 3rd wettest in the Indianapolis area since 1871.
Severe Weather
Severe weather impacted central Indiana on numerous occasions throughout the month. Much of the severe weather and flooding was a result of a few frontal boundaries oscillating across the region with waves of low pressure riding along the fronts.
The first significant bout of severe weather occurred during the early morning of June 6 as an unusually strong low pressure system moved across the lower Great Lakes. Numerous supercell thunderstorms producing damaging winds and tornadoes developed over northern Illinois during the evening of June 5 before migrating into north central Indiana after midnight. One of the supercells produced two EF0 tornadoes over Carroll County, causing some structural damage in Yeoman.
The majority of the severe weather across central Indiana however took place between June 12 and 22 as the frontal boundary remained in the vicinity of the region. This included severe storms producing an EF0 tornado in Paragon in Morgan County on the evening of the 12th, two intense bow echo lines of thunderstorms moving across the region and producing widespread wind damage on the 14th and again on the 15th, and additional severe thunderstorms producing flooding during the evening of the 18th and the early morning of the 19th. The culmination of this very busy stretch with waves of thunderstorms producing severe weather and flooding came on the evening of the 21st and early morning of the 22nd as central Indiana was affected by three significant thunderstorm clusters over about a 12 hour period. Initially, these storms produced damaging winds and constant cloud-to-ground lightning but as heavy rain continued to fall, the focus during the early morning of the 22nd shifted to flash flooding across much of the region. Much of central Indiana received 3 to 4 inches of rain from sunset on the 21st through daybreak on the 22nd, and this led to several instances of flash flooding across the region.

For more detailed information regarding severe weather across central Indiana in June, please visit  http://www.crh.noaa.gov/ind/?n=june2010severe.

For information on severe weather in other areas during June, visit the Storm Prediction Center “Severe Weather Event Summaries” website at http://www.spc.noaa.gov/climo/online/
At the Indianapolis International Airport, the peak wind gust this month was 58 mph from the southwest on June 27 as a line of thunderstorms approached. Fog or haze was observed on 19 days. Thunderstorms were observed on 17 days during the month.
July 2010 Outlook
The official outlook for July 2010 from the Climate Prediction Center indicates a greater chance of slightly below normal temperatures for central Indiana. At Indianapolis, the average temperature for the month is 75.4 degrees. The outlook also calls for a greater chance of above normal precipitation. The average precipitation for July at Indianapolis is 4.42”.
Data prepared by the Indianapolis Forecast Office.

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