Alert archive / Oklahoma / Excessive Heat Warnings in 2017

Excessive Heat Warning 1, NWS Tulsa, OK

June 17, 20179 counties in Oklahoma

NWS Tulsa, OK issued this excessive heat warning at Jun 17, 2017, 3:00 AM CDT for 9 counties in Oklahoma. It took effect at Jun 17, 2017, 11:00 AM CDT. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 17, 2017, 3:00 AM CDT (08:00 UTC)
In effect from: Jun 17, 2017, 11:00 AM CDT
Expired: Jun 17, 2017, 2:53 PM CDT
In force: 4 hr
Issued by: NWS Tulsa, OK

Counties Craig County, OK, Creek County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Pawnee County, OK, Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 36 km from the middle of the area, began a volume at 08:04 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 00:00Z, 8.0 hours before the alert went out and 207 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3060 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1311 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning 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 excessive heat warning went out at Jun 17, 2:57 AM CDT, 3 minutes earlier.

Area forecast discussion, Jun 17, 2:57 AM CDT, 3 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
257 AM CDT Sat Jun 17 2017

.DISCUSSION...
Keeping a close eye on severe MCS currently dropping southeast
across eastern KS/western MO. HRRR has struggled with the
evolution of this system through most of the night...although the
latest iteration appears to have a reasonable handle. Will likely
see this activity move into parts of northwest AR (and perhaps far
northeastern OK) toward daybreak although in a more weakened
state...but we could still see some gusty winds. Will make some
last minute tweaks to first period PoPs prior to forecast
issuance.

The next order of business will be the widespread excessive heat
for this afternoon. Expect a rather large area of mid 70s dewpoint
pooling across parts of eastern OK...and with highs expected to
top out in the mid/upper 90s will upgrade advisory to an excessive
heat warning for much of northeast OK.

A cold front will advance into southeast KS by late
afternoon/early evening...with additional shower/thunderstorm
development expected along the boundary. This activity should move
into northern sections of the forecast area later Saturday night
as the cold front sags farther south. The front will slow a bit
across southeast OK/western AR in Sunday...and provide the focus
for additional afternoon convection. Strong forecast instability
will support a few severe storms...with large hail/damaging winds
being the main threat. The cold front...along with associated
cloud cover/precipitation will hold afternoon temps down
considerably with highs mainly in the 80s.

The cooler/drier conditions will continue into Monday/Monday
night...with a return to more hot/humid conditions returning by
Tuesday and continuing through the remainder of the week. The
forecast area will remain along the southern edge of the
westerlies...so some nocturnal convection is not out of the
question mainly for the northern areas.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   98  72  83  63 /   0  40  40  10
FSM   98  76  87  65 /  20  20  50  20
MLC   95  74  85  64 /   0  10  30  20
BVO   97  70  82  59 /   0  50  20  10
FYV   92  71  80  58 /  20  40  40  10
BYV   92  70  79  59 /  30  60  40  10
MKO   95  73  83  61 /   0  20  40  10
MIO   95  70  83  60 /  20  60  40  10
F10   96  73  83  62 /   0  20  20  10
HHW   95  76  89  66 /   0   0  50  50

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Heat Advisory from 11 AM this morning to 9 PM CDT this evening
     for OKZ049-053-058-062-063-067-068-070>076.

     Excessive Heat Warning from 11 AM this morning to 9 PM CDT this
     evening for OKZ054>057-059>061-064>066.

AR...Heat Advisory from 11 AM this morning to 9 PM CDT this evening
     for ARZ019-020-029.

&&

SHORT TERM...14
LONG TERM....18

Hazardous weather outlook, Jun 16, 9:28 PM CDT, 5 hours 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 5:44 AM CDT	Severe Thunderstorm Warning	TSA	Ottawa	35 min
Jun 17, 6:14 AM CDT	Special Weather Statement	TSA	Craig	31 min
Jun 17, 6:46 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	44 min
Jun 17, 6:55 AM CDT	Special Weather Statement	TSA	Delaware	35 min
Jun 17, 7:06 AM CDT	Special Weather Statement	TSA	Delaware	39 min
Jun 17, 7:16 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes	44 min
Jun 17, 7:27 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	33 min
Jun 17, 8:00 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes	60 min
Jun 17, 8:19 AM CDT	Special Weather Statement	TSA	Cherokee, Sequoyah	26 min
Jun 17, 8:46 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Wagoner	44 min
Jun 17, 8:51 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Muskogee, Sequoyah	39 min
Jun 17, 9:23 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Haskell, McIntosh, Muskogee, Sequoyah	52 min
Jun 17, 10:07 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, McIntosh, Muskogee, Pittsburg and 1 more	38 min
Jun 17, 10:37 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, McIntosh, Pittsburg	38 min
Jun 17, 11:12 AM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	63 min
Jun 17, 12:15 PM CDT	Special Weather Statement	TSA	Pushmataha	60 min
Jun 17, 2:53 PM CDT	Heat Advisory	TSA	Craig, Creek, Nowata, Okfuskee, Okmulgee, Pawnee and 3 more	3 hr
Jun 17, 5:15 AM CDT	Special Weather Statement	TSA	Benton, Carroll	60 min

Nearby

Excessive Heat Warnings in Oklahoma, 2017 Every excessive heat warning in 2017

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.