Round Rock Weather

Fire Weather Index for Round Rock, Texas
Last Updated: 2/4/2012 3:02:03 PM

Current Readings

FWI

FFDC

SFDC

GFDC

BUI

ISI

DMC

FFMC

CBI

CBI DC

Temperature

Humidity

Wind Speed

Rainfall

As of

0.8

1.1

182

64.0

16.5

58.1°F

51%

0.17"

2/4/2012

Monthly CBI/Danger Code

10.0 - LW

Date	Temp ºF	Humidity %	Wind Spd mph	Rainfall in	FFMC	DMC	DC	ISI	BUI	FWI	FFDC	SFDC	GFDC	CBI	CBI DC
2/4/2012	58.1	51	10	0.17	64.0	9	182	1.1	15	0.8	LW	HI	MD	16.5	LW
2/3/2012	76.8	65	5	0.14	70.1	12	187	0.9	20	0.8	LW	HI	MD	7.1	LW
2/2/2012	74.4	73	3	0.00	85.9	15	188	3.0	25	5.6	MD	EX	HI	3.2	LW
2/1/2012	81.8	44	11	0.01	88.2	14	184	8.0	24	12.9	MD	EX	VH	29.0	LW
1/31/2012	74.6	60	13	0.13	76.1	12	179	2.3	21	3.8	LW	EX	MD	10.2	LW
1/30/2012	63.7	69	5	0.00	86.5	15	179	3.9	25	7.1	MD	EX	HI	4.2	LW
1/29/2012	64.0	28	6	0.00	90.5	14	176	7.4	23	12.0	MD	EX	VH	62.7	MD
1/28/2012	57.0	27	11	0.00	88.1	12	173	7.9	20	11.6	MD	EX	VH	64.2	MD
1/27/2012	70.1	41	15	0.00	79.5	10	171	3.6	17	5.4	MD	EX	HI	32.3	LW
1/26/2012	47.3	89	6	0.00	40.6	8	167	0.1	15	0.1	LW	MD	LW	-1.5	LW
1/25/2012	56.5	85	15	1.37	29.7	8	166	0.0	14	0.0	LW	LW	LW	-0.6	LW
1/24/2012	59.2	95	4	0.14	45.5	21	255	0.1	35	0.1	LW	MD	LW	-1.6	LW
1/23/2012	63.9	35	4	0.00	87.4	29	259	4.0	45	10.4	MD	EX	HI	43.5	LW
1/22/2012	72.8	73	7	0.00	81.2	27	256	2.3	43	6.2	MD	EX	MD	3.1	LW
1/21/2012	56.3	54	6	0.00	75.7	26	252	1.3	41	3.3	LW	VH	MD	13.3	LW
11/29/2011	65.2	25	9	0.00	91.6	16	359	11.0	29	18.1	NA	NA	NA	73.3	MD
11/28/2011	61.0	21	2	0.00	90.1	14	356	5.1	26	9.2	NA	NA	NA	87.9	HI
11/27/2011	53.2	21	17	0.00	84.4	12	353	7.6	21	11.7	NA	NA	NA	85.5	HI
11/26/2011	60.1	54	24	1.09	62.1	10	351	3.2	19	5.0	NA	NA	NA	13.7	LW
11/25/2011	77.4	45	10	0.00	88.6	24	467	7.8	43	17.1	NA	NA	NA	26.8	LW
11/24/2011	72.1	44	2	0.01	85.0	22	463	2.5	39	6.3	NA	NA	NA	27.6	LW
11/23/2011	69.3	55	4	0.01	75.2	20	459	1.1	37	2.4	NA	NA	NA	13.8	LW
11/22/2011	62.3	62	13	1.06	52.6	19	456	0.6	35	0.8	NA	NA	NA	7.8	LW
11/21/2011	72.1	72	3	0.09	70.6	48	609	0.8	80	3.3	NA	NA	NA	3.5	LW
11/20/2011	82.8	55	7	0.00	87.6	54	605	5.3	88	19.0	NA	NA	NA	15.2	LW
11/19/2011	77.7	70	0	0.00	86.2	52	600	2.5	86	10.4	NA	NA	NA	4.6	LW
11/18/2011	68.8	57	6	0.00	86.2	51	596	4.0	84	15.0	NA	NA	NA	12.0	LW
11/17/2011	61.5	31	4	0.00	85.8	50	593	3.2	82	12.4	NA	NA	NA	53.2	MD
11/16/2011	75.8	49	10	0.02	74.7	48	590	1.7	80	7.1	NA	NA	NA	21.0	LW

Station Information Name: Round Rock Altitude: 709' AMSL Latitude: 30.5486 Longitude: -97.6261 Forest Slope: 5% Brush Slope: 5% Brush Height: 4' Grass Slope: 3% Grass Curing: 100	Current Drought Days (Total)	0
	Current Rain Days (Total)	2
	Current Rain Total	0.31
	High Temperature/Date	107.7°F 8/28/2011
	High Humidity/Date	100% 11/15/2011
	High Wind Speed/Date	28 mph 12/24/2009
	High Rainfall/Date	4.60" 9/8/2010
	High FFMC/Date	107.1 8/24/2010
	High DMC/Date	1453 4/25/2008
	High DC/Date	16101 6/8/2010
	High ISI/Date	63.6 1/31/2008
	High BUI/Date	2186 9/10/2009
	High FWI/Date	121.2 1/31/2008
	High CBI/Date	174.8 11/8/2008
	Low Temperature/Date	27.2°F 1/8/2010
	Low Humidity/Date	13% 2/3/2009
	Low Wind Speed/Date	0 mph 11/19/2011
	Low FFMC/Date	28.7 10/9/2011
	Low DMC/Date	8 1/26/2012
	Low DC/Date	166 1/25/2012
	Low ISI/Date	0.0 1/25/2012
	Low BUI/Date	14 1/25/2012
	Low FWI/Date	0.0 1/25/2012
	Low CBI/Date	-1.7 11/15/2011

Definitions:

BUI - Build Up Index
DC - Drought Code
DMC - Duff Moisture Code
FFDC - Forest Fire Danger Code
FFMC - Fine Fuel Moisture Code
GFDC - Grassland Fire Danger Code
FWI - Fire Weather Index
ISI - Initial Spread Index
SFDC - Scrubland (Brush) Fire Danger Code

Key to Fire Weather Index Indices
FFMC (Fine Fuel Moisture Code) This is a numerical rating of the moisture content of surface litter and other cured fine fuels. It shows the relative ease of ignition and flammability of fine fuels. The moisture content of fine fuels is very sensitive to the weather. Even a day of rain, or of fine and windy weather, will significantly affect the FFMC rating. The system uses a time lag of two-thirds of a day to accurately measure the moisture content in fine fuels. The FFMC rating is on a scale of 0 to 99. Any figure above 70 is high, and above 90 is extreme.

DMC (Duff Moisture Code) DMC is a numerical rating of the average moisture content of loosely compacted organic layers of moderate depth. The code indicates the depth that fire will burn in moderate duff layers and medium size woody material. Duff layers take longer than surface fuels to dry out but weather conditions over the past couple of weeks will significantly affect the DMC. The system applies a time lag of 12 days to calculate the DMC. A DMC rating of more than 30 is dry, and above 40 indicates that intensive burning will occur in the duff and medium fuels. Burning off operations should not be carried out when the DMC rating is above 40.

DC (Drought Code) The DC is a numerical rating of the moisture content of deep, compact, organic layers. It is a useful indicator of seasonal drought and shows the likelihood of fire involving the deep duff layers and large logs. A long period of dry weather (the system uses 52 days) is needed to dry out these fuels and affect the Drought Code. A DC rating of 200 is high, and 300 or more is extreme indicating that fire will involve deep sub-surface and heavy fuels. Burning off should not be permitted when the DC rating is above 300.

ISI: (Initial Spread Index) This indicates the rate fire will spread in its early stages. It is calculated from the FFMC rating and the wind factor. The open-ended ISI scale starts at zero and a rating of 10 indicates high rate of spread shortly after igition. A rating of 16 or more indicates extremely rapid rate of spread.

BUI (Build Up Index) This index shows the amount of fuel available for combustion, indicating how the fire will develop after initial spread. It is calculated from the Duff Moisture Code and the Drought Code. The BUI scale starts at zero and is open-ended. A rating above 40 is high, above 60 is extreme.

FWI (Fire Weather Index) Information from the ISI and BUI is combined to provide a numerical rating of fire intensity - the Fire Weather Index. The FWI indicates the likely intensity of a fire. The FWI is divided into four fire danger classes: Low 0 - 7 Moderate 8 - 16 High l7 - 31 Extreme 32+

FFDC (Forest Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in forest type vegetation (pine, beech). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

SFDC (Scrub Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in scrub type vegetation (manuka, gorse, broom). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

GFDC (Grass Fire Danger Code) Based on predicted generated "fire intensity (kw/m?)" in grass type vegetation (dry grass, tussock). This code denotes how difficult it would be to control a fire in this vegetation type should one start. (Low, Moderate, High, Very High, Extreme)

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