Alert archive / Oklahoma / Heat Advisories in 2016

Heat Advisory 15, NWS Tulsa, OK

July 20, 201621 counties in Oklahoma

NWS Tulsa, OK issued this heat advisory at Jul 20, 2016, 3:43 PM CDT for 21 counties in Oklahoma. It took effect at Jul 21, 2016, 12:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 20, 2016, 3:43 PM CDT (20:43 UTC)
In effect from
Jul 21, 2016, 12:00 PM CDT
Expired
Jul 21, 2016, 9:00 PM CDT
In force
9 hr
Issued by
NWS Tulsa, OK
All 21 counties

Cherokee County, OK, Choctaw County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pawnee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 41 km from the middle of the area, began a volume at 20:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.7 hours before the alert went out and 200 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2016-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1607 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2016-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1607 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1150 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this heat advisory went out at Jul 19, 6:07 PM CDT, 21 hours 36 minutes earlier.

Area forecast discussion, Jul 19, 6:07 PM CDT, 21 hours 36 minutes before
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Hazardous weather outlook, Jul 19, 4:25 PM CDT, 23 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
425 PM CDT TUE JUL 19 2016

ARZ001-002-010-011-019-020-029-OKZ049-053>076-201030-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
425 PM CDT TUE JUL 19 2016

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERE THUNDERSTORM.
	RISK...LIMITED.
	AREA...FAR EASTERN OKLAHOMA AND WESTERN ARKANSAS.
	ONSET...ONGOING.

HEAVY RAIN.
	RISK...LIMITED.
	AREA...FAR EASTERN OKLAHOMA AND WESTERN ARKANSAS.
	ONSET...ONGOING.

DANGEROUS HEAT.
	RISK...ELEVATED.
	AREA...EASTERN OKLAHOMA AND PORTIONS OF WESTERN ARKANSAS.
	ONSET...ONGOING.

DISCUSSION...

ISOLATED TO WIDELY SCATTERED STORMS THIS AFTERNOON WILL HAVE A LOW
CHANCE OF PRODUCING A SEVERE DOWNBURST. OTHERWISE...DANGEROUS
LIGHTNING AND LOCALLY HEAVY RAINFALL WILL BE THE MAIN THREATS WITH
THE SLOW MOVING STORMS.

HEAT INDICES IN THE 100 TO 107 DEGREE RANGE ARE OCCURRING ACROSS
PORTIONS OF EASTERN OKLAHOMA THAT HAVE NOT BEEN AFFECTED BY STORM
OUTFLOW. THESE DANGEROUS HEAT INDICES SHOULD IMPROVE BY SUNSET.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
LOCAL SPOTTER ACTIVATION MAY BE NEEDED.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
WEDNESDAY THRU SUNDAY...DANGEROUS HEAT POTENTIAL.
MONDAY...THUNDERSTORM POTENTIAL...DANGEROUS HEAT POTENTIAL.

EXTENDED DISCUSSION...

THE DANGEROUS HEAT AND HUMIDITY WILL PERSIST THROUGH THE REST OF
THE WEEK AND INTO THE WEEKEND...AS A RIDGE OF HIGH PRESSURE BUILDS
OVERHEAD. AFTERNOON HEAT INDICES WILL GENERALLY BE IN THE 105 TO
110 RANGE ACROSS MUCH OF EASTERN OKLAHOMA AND WEST CENTRAL
ARKANSAS. ADDITIONAL HEAT ADVISORIES WILL LIKELY BE NEEDED THROUGH
THIS WEEKEND.

THE RIDGE ALOFT IS EXPECTED TO SLIDE WEST OF THE REGION BY EARLY
NEXT WEEK...AND WILL ALLOW A FRONTAL BOUNDARY TO BRING THE
POTENTIAL FOR STORMS BY MONDAY.

WWW.WEATHER.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

LACY

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 6:30 PM CDTSpecial Weather StatementTSASebastian15 min

Nearby

Heat Advisories in Oklahoma, 2016Heat Advisories in Arkansas, 2016Every heat advisory in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.