Alert archive / Oklahoma / Freeze Warnings in 2013

Freeze Warning 7, NWS Tulsa, OK

April 23, 20135 counties in Oklahoma

NWS Tulsa, OK issued this freeze warning at Apr 23, 2013, 4:15 PM CDT for 5 counties in Oklahoma. It took effect at Apr 24, 2013, 1:00 AM CDT. It was in force for 7 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: Apr 23, 2013, 4:15 PM CDT (21:15 UTC)
In effect from: Apr 24, 2013, 1:00 AM CDT
Expired: Apr 24, 2013, 8:11 AM CDT
In force: 7 hr
Issued by: NWS Tulsa, OK

Counties Craig County, OK, Nowata County, OK, Ottawa County, OK, Pawnee County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 57 km from the middle of the area, began a volume at 21:18 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

Lamont, OK (KLMN), launched 12:00Z, 9.3 hours before the alert went out and 164 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 731 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 freeze 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 freeze warning went out at Apr 23, 4:08 PM CDT, 7 minutes earlier.

Area forecast discussion, Apr 23, 4:08 PM CDT, 7 minutes before

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Hazardous weather outlook, Apr 23, 12:48 PM CDT, 3 hours 27 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 23, 1:56 AM CDT	Special Weather Statement	TSA	Okfuskee	34 min
Apr 23, 2:03 AM CDT	Special Weather Statement	TSA	Creek	27 min
Apr 23, 2:15 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	30 min
Apr 23, 2:18 AM CDT	Severe Thunderstorm Warning	TSA	Creek	27 min
Apr 23, 2:43 AM CDT	Special Weather Statement	TSA	Okmulgee	32 min
Apr 23, 2:52 AM CDT	Special Weather Statement	TSA	Tulsa	23 min
Apr 23, 3:29 AM CDT	Special Weather Statement	TSA	Craig, Nowata	46 min
Apr 23, 9:54 AM CDT	Frost Advisory	TSA	Cherokee, Craig, Creek, Delaware, Mayes, Muskogee and 9 more	22 hr

Nearby

Freeze Warnings in Oklahoma, 2013 Every freeze warning in 2013

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.