Alert archive / Oklahoma / Freeze Watches in 2018

Freeze Watch 4, NWS Tulsa, OK

April 14, 201821 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this freeze watch at Apr 14, 2018, 3:10 AM CDT for 21 counties in Oklahoma; 4 counties in Arkansas. It took effect at Apr 15, 2018, 1:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 14, 2018, 3:10 AM CDT (08:10 UTC)
In effect from: Apr 15, 2018, 1:00 AM CDT
Expired: Apr 14, 2018, 8:22 PM CDT
In force
Issued by: NWS Tulsa, OK

All 25 counties

Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee 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), 37 km from the middle of the area, began a volume at 08:11 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, 8.2 hours before the alert went out and 170 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: 505 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze watch 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 freeze watch went out at Apr 14, 2:57 AM CDT, 13 minutes earlier.

Area forecast discussion, Apr 14, 2:57 AM CDT, 13 minutes before

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Hazardous weather outlook, Apr 13, 9:02 PM CDT, 6 hours 8 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
Apr 14, 3:10 AM CDT	Wind Advisory	TSA	Pawnee	16 hr
Apr 14, 3:19 PM CDT	Freeze Warning	TSA	Adair, Cherokee, Craig, Creek, Delaware, Haskell and 15 more	19 hr
Apr 13, 7:18 PM CDT	Special Weather Statement	TSA	Sebastian	42 min
Apr 13, 7:29 PM CDT	Special Weather Statement	TSA	Franklin	31 min

Nearby

Freeze Watches in Oklahoma, 2018 Freeze Watches in Arkansas, 2018 Every freeze watch in 2018

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.