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June 2017 - Report and Summary

The thirty-day outlook, issued on May 18, 2017, had called for above normal temperatures and near normal precipitation. When revised on May 31, it called for near normal temperatures and above normal precipitation. Compared with June 2016, the month was 1.6 deg. Cooler, and 4.54 inches wetter. Year-to-date rainfall was 1.84 inches more in 2017 than in 2016. A diffuse upper air low pressure area covered much of the Southern United States for the first several days in June. This resulted in temperatures holding near normal, and several occurrences of showers and thunderstorms, with some instances of heavy rainfall. The rains were the result of a very strong flow of moist air extending from the surface well into the atmosphere. Areal coverage on the 1st was about 50 percent, with amounts generally around one inch. Theheaviest was 2.23 inches in Henderson.

On the 2nd, coverage increased to near 80 percent, with amounts of between one-half and two inches. The heaviest was 3.05 inches at Arp. Tree damage was reported from Panola County. Showers and a few thunderstorms were again widespread on the 3rd, with coverage nearing 80 percent and amounts running from one-half inch to three inches. The heaviest was 3.08 inches at Nacogdoches. Tyler established a new daily rainfall record on June 3 of 2.80 inches. This replaces the previous record of 2.56 inches from 1981.

Rain and thunderstorms developed again on the afternoon of the 4th, with coverage again near 80 percent. Very heavy rain fell in a band about 40 miles wide from Tyler to Hallsville, requiring a flash flood warning, and in another band from Terrell to Sulphur Springs. Tyler received an inch and a half between 6 p.m. and 7 p.m. on the 4th. The heaviest rain on that day was 3.90 inches near Terrell.

Activity on the 5th was considerably less as the upper air low finally began moving east of the region, and energy concentrated on its western and southern flank from North Central Texas southward to the Texas Coast and over the Gulf of Mexico. Coverage in East Texas was about 50 percent, and most amounts were under one-half inch. Cooper received the heaviest rain with 1.41 inches.

On the 6th, the upper air low was east of the region, but still close enough for scattered showers southeast of a Lufkin-El Dorado line. Coverage was about 30 percent. The heaviest rain reported was 0.70 inch at Center.

The lack of severe weather with the system of the 1st-6th was due to the absence of significant surface boundaries cold fronts, dew point fronts, or outflow boundaries. Upper air high pressure continued building overhead on the 7th, with seasonably warm and mostly dry conditions through the 11th. On the morning of the 9th, a decaying thunderstorm complex brought showers to some locations in the western counties during the morning hours. Areal coverage was under 30 percent, and most amounts were under one-half inch. The heaviest was 1.14 inches at Gunbarrel City. A weakness in the ridge permitted the sea-breeze to become more active between the 11th and 13th. Areal coverage of showers primarily over the southeastern counties on the 11th was about 10 percent, with most amounts on each of these days under one-fourth inch. Pineland received 1.46 inches on the 11th. Activity reached the IH-30 Corridor on the 12th with coverage of about 30 percent. The heaviest rainfall on the 12th was 0.84 inch at Detroit. Coverage on the 13th was again about 30 percent, including much of the area. The heaviest amount reported was 0.66 inch at Mount Pleasant.

Upper air high pressure began building into the region on the 13th, with warming temperatures. There were only a few isolated showers on the 14th, with coverage under 10 percent and amounts under one-tenth of an inch. Temperatures went a few degrees above normal from the 12th through the 18th.

A weak cold front eased into the area on the 19th. This brought slightly lower temperatures, and showers and a few thunderstorms with areal coverage of about 40 percent. Amounts and coverage increased from south to north, with most activity north of IH-20, and amounts were mostly under one-half inch. The heaviest was 1.78 inches at Paris Cox Field.

The area's weather was dominated by Tropical Storm Cindy between the 20th and 23rd. The storm formed about 300 miles south of the mouth of the Mississippi River on the 20th, came ashore east of Port Arthur on the early-morning of the 22nd with winds of 50 mph, and then moved northward through western Louisiana on that afternoon while weakening, and then turned northeastward. The center of the by-then tropical depression was about 80 miles east of Tyler at mid-afternoon on the 22nd.

Areal coverage of rainfall was about 60 percent, with coverage and amounts increasing from west to east. Amounts ran from a tenth of an inch in the central and western counties to between one and four inches near the Louisiana border. Center had the largest rainfall total with 5.11 inches. Temperatures ran near to slightly above normal at this time.

Though Cindy departed, its moisture did not. An unusual Summer cold front entered the area on the morning of the 24th, resulting in widespread thunderstorms. Coverage neared 100 percent, with amounts ranging from around one-half inch to two inches. Rains were heavier over the eastern and southwestern portions of the region, with Marshall measuring the heaviest rain at 3.99 inches. There were a few reports of trees being downed.

Weak upper air high pressure was the main factor for the region between the 25th and 30th. There were isolated to scattered showers daily, mainly to the west between the 25th and 27th, and to the south between the 28th and 30th. Temperatures continued at near to slightly above normal values.

The reporting period for temperatures and phenomenon on each day is for the twenty-four hours ending at midnight hours GMT--6 p.m. CST and 7 p.m. CDT. The reporting period for precipitation is for the twenty-four hours ending at noon GMT--6 a.m. CST and 7 a.m. CDT. All times are given using the twenty-four hour clock, and are expressed in Greenwich Mean Time.

Observations are from NWS Station 41/9207/4 in Tyler, Texas. The term "normal" refers to averages from the standard climatic period 1971-2000.

June 2017



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