Alert archive / Oklahoma / Freeze Warnings in 2009

Freeze Warning 4, NWS Tulsa, OK

April 5, 20098 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this freeze warning at Apr 5, 2009, 3:03 PM CDT for 8 counties in Oklahoma; 4 counties in Arkansas. It took effect at Apr 6, 2009, 1:00 AM CDT. It was in force for 8 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 5, 2009, 3:03 PM CDT (20:03 UTC)
In effect from: Apr 6, 2009, 1:00 AM CDT
Expired: Apr 6, 2009, 9:00 AM CDT
In force: 8 hr
Issued by: NWS Tulsa, OK

Counties Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Nowata County, OK, Ottawa County, OK, Pawnee County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 20:03 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, 8.1 hours before the alert went out and 113 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1695 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 5, 12:30 PM CDT, 2 hours 33 minutes earlier.

Area forecast discussion, Apr 5, 12:30 PM CDT, 2 hours 33 minutes before

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Hazardous weather outlook, Apr 5, 12:59 PM CDT, 2 hours 4 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 5, 12:32 AM CDT	Special Weather Statement	TSA	McIntosh	28 min
Apr 5, 12:44 AM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	25 min
Apr 5, 1:44 AM CDT	Special Weather Statement	TSA	Pittsburg	31 min
Apr 5, 3:28 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore	32 min
Apr 5, 4:30 AM CDT	Wind Advisory	TSA	Adair, Cherokee, Choctaw, Craig, Creek, Delaware and 16 more	15 hr
Apr 5, 3:03 PM CDT	Freeze Warning	TSA	Adair, Cherokee, Choctaw, Craig, Creek, Delaware and 16 more	42 hr
Apr 5, 3:19 AM CDT	Special Weather Statement	TSA	Sebastian	26 min

Nearby

Freeze Warnings in Oklahoma, 2009 Freeze Warnings in Arkansas, 2009 Every freeze warning in 2009

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.