Alert archive / Oklahoma / Flash Flood Watches in 2009

Flash Flood Watch 1, NWS Tulsa, OK

April 27, 20095 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this flash flood watch at Apr 27, 2009, 2:56 AM CDT for 5 counties in Oklahoma; 4 counties in Arkansas. It took effect at Apr 27, 2009, 1:00 PM CDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Apr 27, 2009, 2:56 AM CDT (07:56 UTC)
In effect from: Apr 27, 2009, 1:00 PM CDT
Expired: Apr 27, 2009, 4:18 PM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Flood severity: None

Counties Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Choctaw County, OK, Haskell County, OK, Latimer County, OK, Pittsburg County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 36 km from the middle of the area, began a volume at 07:55 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, 7.9 hours before the alert went out and 193 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: 56 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 1698 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood watch went out at Apr 26, 11:44 PM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Apr 26, 11:44 PM CDT, 3 hours 12 minutes before

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Hazardous weather outlook, Apr 27, 2:20 AM CDT, 36 minutes before

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In the hours before

Special weather statement, Apr 27, 12:26 AM CDT, 2 hours 30 minutes before

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Special weather statement, Apr 27, 12:27 AM CDT, 2 hours 29 minutes before

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Special weather statement, Apr 27, 1:25 AM CDT, 1 hour 31 minutes before

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Special weather statement, Apr 27, 1:27 AM CDT, 1 hour 29 minutes before

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Special weather statement, Apr 27, 1:59 AM CDT, 57 minutes before

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Special weather statement, Apr 27, 2:50 AM CDT, 6 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 26, 7:25 PM CDT	Wind Advisory	TSA	Craig, Creek, McIntosh, Mayes, Muskogee, Nowata and 7 more	3 hr
Apr 26, 10:15 PM CDT	Special Weather Statement	TSA	Okfuskee, Okmulgee, Pittsburg	60 min
Apr 26, 10:32 PM CDT	Special Weather Statement	TSA	Creek, Pawnee	28 min
Apr 26, 10:54 PM CDT	Special Weather Statement	TSA	Osage, Pawnee	66 min
Apr 26, 11:37 PM CDT	Special Weather Statement	TSA	Creek, Nowata, Rogers, Tulsa, Wagoner, Washington	53 min
Apr 27, 12:26 AM CDT	Special Weather Statement	TSA	Craig, Mayes, Muskogee, Nowata, Okmulgee, Ottawa and 2 more	64 min
Apr 27, 12:27 AM CDT	Special Weather Statement	TSA	Osage	63 min
Apr 27, 1:25 AM CDT	Special Weather Statement	TSA	Delaware, Mayes, Ottawa	65 min
Apr 27, 1:59 AM CDT	Special Weather Statement	TSA	Cherokee, Delaware, Mayes, Wagoner	61 min
Apr 27, 11:05 AM CDT	River Flood Warning	TSA	Ottawa	8 days
Apr 27, 12:17 PM CDT	Special Weather Statement	TSA	Haskell, Sequoyah	43 min
Apr 27, 12:28 PM CDT	Areal Flood Advisory	TSA	Choctaw	2 hr
Apr 27, 1:13 PM CDT	Wind Advisory	TSA	Adair, Haskell, Muskogee, Pittsburg	3 hr
Apr 27, 1:35 PM CDT	Severe Thunderstorm Warning	TSA	Osage	40 min
Apr 27, 1:37 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	53 min
Apr 27, 2:17 PM CDT	Areal Flood Advisory	TSA	Osage, Pawnee	88 min
Apr 27, 2:17 PM CDT	Special Weather Statement	TSA	Osage	43 min
Apr 27, 2:17 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	46 min
Apr 27, 2:27 PM CDT	Severe Thunderstorm Warning	TSA	Osage	63 min
Apr 27, 3:05 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	40 min
Apr 27, 3:13 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	30 min
Apr 27, 3:42 PM CDT	Areal Flood Advisory	TSA	Craig, Nowata, Osage, Rogers, Washington	93 min
Apr 27, 4:20 PM CDT	Special Weather Statement	TSA	Washington	25 min
Apr 27, 6:03 PM CDT	Special Weather Statement	TSA	Rogers	27 min
Apr 27, 2:50 AM CDT	Special Weather Statement	TSA	Benton	55 min

Nearby

Flash Flood Watches in Oklahoma, 2009 Flash Flood Watches in Arkansas, 2009 Every flash flood watch 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.